JP2001342881A - Abnormality sensing device for fuel supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sense abnormality in a fuel supply system accurately. SOLUTION: A control part 28 of a constant current type control circuit 23 counts the number of times of the power being turned on and also counts the number of times of the control signal from a control circuit 20 being turned on. If the two are identical. judgement is passed that the fuel supply system hunctions normally. If the number of signal-on times remains zero even if the number of power-on times exceeds the specified value, judgement is passed that any abnormality has happened such as a severance in the control signal wire, shortcircuiting between it and the ground, etc., when the control signal is in the normal On condition or normal Off condition. If the number of power-on times remains zero even if the number of signal-on times exceeds its specified value, judgement is passed that any abnormality has happened such as shortcircuiting between the power line and a backup power supply, between the power side terminal of a fuel pump 12 and the backup power supply, etc., when the power supply is in the normal On condition or normal Off condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting device for a fuel supply system for judging whether or not there is an abnormality in a fuel supply system for sending fuel to a fuel injection valve by a fuel pump.

[0002]

2. Description of the Related Art In recent years, a fuel pump has been controlled by an on-board computer in accordance with an operating state of an internal combustion engine to pump fuel in a fuel tank to a fuel injection valve of the internal combustion engine. In such a fuel supply system, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-88755, the rotational speed of the fuel pump is determined from the supplied fuel amount calculated based on the engine operating state and the estimated or detected fuel pressure. In addition to the estimation, the actual pump rotation speed is detected from the pulsation of the pump current, and the presence or absence of abnormality in the fuel supply system is determined based on whether or not the deviation between the actual pump rotation speed and the estimated pump rotation speed is within a predetermined normal range. There are things that I try to do.

[0003]

However, it is difficult to accurately estimate the pump rotational speed from the supplied fuel amount and the fuel pressure, and it is also difficult to accurately detect the actual pump rotational speed from the pulsation of the pump current. Therefore, there is a problem that it is not possible to accurately determine whether or not the fuel supply system is abnormal based on the difference between the estimated pump rotation speed and the actual pump rotation speed.

[0004] The present invention has been made in view of such circumstances, and the object thereof is to accurately determine the presence or absence of an abnormality in the fuel supply system and improve the accuracy of abnormality detection. An object of the present invention is to provide an abnormality detection device for a fuel supply system.

[0005]

According to a first aspect of the present invention, there is provided an abnormality detecting device for a fuel supply system, comprising: an input / output signal of a fuel pump control device; Volume, operating state of the fuel pump,
An abnormality in the fuel supply system is determined based on at least one of an operation state of the internal combustion engine and a fuel supply state to the fuel injection valve. Here, the input / output signal of the fuel pump control device, the control amount of the fuel pump, the operation state of the fuel pump, the operation state of the internal combustion engine, and the fuel supply state to the fuel injection valve all indicate the operation state of the fuel supply system. This is a parameter to be reflected, and if the fuel supply system is functioning normally, it exhibits a predetermined behavior or falls within a predetermined normal range. There are also parameters that change with a predetermined correlation with each other. Therefore, by using the above-mentioned parameters, it is possible to monitor the operating state of the fuel supply system and accurately determine whether or not the fuel supply system is abnormal.

In this case, specific parameters representing the input / output signal of the fuel pump control device, the control amount of the fuel pump, the operating state of the fuel pump, the operating state of the internal combustion engine, and the state of fuel supply to the fuel injection valve are respectively described. Although various types are conceivable, a fuel pump control device is provided for controlling an internal combustion engine control circuit for controlling the internal combustion engine and driving the fuel pump based on a control signal from the internal combustion engine control circuit. And a fuel pump control circuit that outputs a drive signal of
In a system in which a monitor signal for monitoring the operation state of the fuel pump control circuit can be used by the fuel pump control circuit or the internal combustion engine control circuit from the fuel pump control circuit, the fuel pump control device used for abnormality determination is used. It is preferable to use at least one of a control signal, a drive signal, a monitor signal, and a power supply signal as the input / output signal. Each of these signals is a parameter for monitoring the operation state of the fuel supply system.

Further, the information on the operating state of the fuel pump used for the abnormality determination includes a pump current,
It is preferable to use at least one of a pump voltage, a pump rotation speed, a pump discharge amount, and a motor torque. These pieces of information also serve as parameters for monitoring the operation state of the fuel supply system.

Further, as the information on the operation state of the internal combustion engine used for the abnormality determination, at least one of the fuel consumption of the engine and the battery voltage may be used. These pieces of information also serve as parameters for monitoring the operation state of the fuel supply system.

According to a fifth aspect of the present invention, the information on the fuel supply state to the fuel injection valve used for abnormality determination includes a fuel pressure in the fuel pipe, a pressure loss in the fuel filter, and a relief valve for adjusting the fuel pressure. It is preferable to use at least one of the above relief pressure and atmospheric hydrocarbon concentration. These pieces of information also serve as parameters for monitoring the operation state of the fuel supply system.

According to a sixth aspect of the present invention, there is provided a feedback control means for feedback-controlling the driving power of the fuel pump and / or a time-dependent change correcting means for correcting a shift of the driving power of the fuel pump due to a time-dependent change of the fuel supply system. In this system, at least one of the feedback correction amount by the feedback control unit and the aging change correction amount by the aging change correction unit may be used as the control amount of the fuel pump used for the abnormality determination. These pieces of information also serve as parameters for monitoring the operation state of the fuel supply system.

Further, it is preferable that the switching element is always on when the drive circuit for controlling the switching element for turning on / off the power supply to the fuel pump breaks down. With this configuration, even if the drive circuit unit fails, the fuel pump can be driven to supply fuel to the internal combustion engine. As a result, even when the drive circuit unit fails, the vehicle can be driven, and the vehicle can travel to a service factory or the like.

On the other hand, the control signal and / or
Alternatively, the configuration is such that the monitor signal does not reach any of the ground level and the power supply voltage level, and it is determined whether the fuel supply system is abnormal based on whether the control signal or the monitor signal has reached the ground level or the power supply voltage level. You may do it. With this configuration, it is possible to accurately determine whether there is an abnormality such as disconnection or short-circuit of the control signal line or the monitor signal line.

According to a ninth aspect, the presence or absence of an abnormality in the fuel supply system may be determined based on the fluctuation range of the power supply voltage of the fuel supply system. If it is determined whether or not the fluctuation range of the power supply voltage of the fuel supply system is within a predetermined normal range, it is possible to accurately determine whether or not there is an abnormality such as a disconnection or a short circuit in the power supply system.

According to a tenth aspect of the present invention, the presence / absence of an abnormality in the fuel supply system is determined based on one of an ON / OFF signal of a power supply of the fuel supply system, a monitor signal, and a control signal. good. If the internal combustion engine control circuit is functioning normally, the control signal is turned on / off in accordance with the power on / off, and if the fuel pump control circuit operates normally in response to the control signal, the fuel A normal monitor signal is output from the pump control circuit. Therefore, the presence / absence of an abnormality in the internal combustion engine control circuit and the fuel pump control circuit can be accurately determined by a combination of the power on / off signal and the control signal or a combination of the control signal and the monitor signal.

[0015] Further, it may be determined whether or not the fuel supply system is abnormal based on the behavior of the monitor signal output from the fuel pump control circuit. That is, by monitoring the monitor signal and determining whether or not the monitor signal shows a normal behavior, it is possible to accurately determine whether there is an abnormality in the fuel pump control circuit or the like.

According to a twelfth aspect of the present invention, a fuel supply system is provided based on at least one of a pump current, a pump voltage, a pump rotation speed, a pump discharge amount, and a fuel pressure of a fuel pump and a drive signal of the fuel pump. The presence or absence of an abnormality may be determined. If the fuel pump is functioning normally, the pump current, pump voltage, pump rotation speed, pump discharge amount, and fuel pressure will change according to the drive signal, so the pump current, pump voltage, pump rotation speed, pump discharge amount The presence / absence of an abnormality in the fuel pump or the like can be accurately determined based on a combination of at least one of the fuel pressure and the drive signal.

According to a thirteenth aspect, the presence or absence of an abnormality in the fuel supply system is determined by comparing the estimated pump voltage calculated from the power supply voltage of the fuel supply system and the drive signal with the actual pump voltage. May be. If the fuel supply system is functioning normally, the actual pump voltage falls within a predetermined normal range with respect to the estimated pump voltage calculated from the power supply voltage and the drive signal. Therefore, by comparing the estimated pump voltage with the actual pump voltage, it is possible to accurately determine whether or not there is an abnormality in the fuel pump or the like.

If the fuel pressure and the fuel consumption of the engine do not increase even if the drive signal (high load operation command) of a predetermined value or more is continuously output from the fuel pump control circuit, abnormalities in the fuel pump, fuel pipe, etc. Is considered to have occurred. Therefore, based on the behavior of the fuel pressure or the amount of fuel consumed by the engine when the drive signal continuously exceeds a predetermined value for a predetermined time or a predetermined number of times, an abnormality in the fuel supply system is determined. The presence or absence may be determined.
This makes it possible to accurately determine the presence or absence of an abnormality in the fuel pump, the fuel pipe, and the like.

Further, a system comprising feedback control means for feedback-controlling the drive power of the fuel pump and time-dependent change correction means for correcting a shift in the drive power of the fuel pump due to time-dependent change of the fuel supply system. Then, the presence or absence of an abnormality in the fuel supply system may be determined based on the behavior of the feedback correction amount and / or the aging change correction amount. If the fuel supply system is functioning normally, the feedback correction amount and the aging correction amount fall within a predetermined normal range. Therefore, by monitoring the behavior of the feedback correction amount and the aging change correction amount, it is possible to accurately determine whether or not there is an abnormality in the fuel supply system.

Further, the abnormality of the fuel supply system is determined based on one of the pump discharge amount of the fuel pump, the fuel pressure in the fuel pipe, and the power supply current of the fuel supply system, and the pump current. May be determined. For example, if the state where the pump current is large and the state where the pump discharge amount is small or the fuel pressure is low continues for a long time while the state where the pump current is large, it is a failure of the fuel pump or the fuel pipe, and the power supply current is large. When the state in which the pump current is small continues for a long time, it is considered that a short circuit or the like in the power supply system has occurred. From these relationships, the presence or absence of an abnormality in the fuel supply system can be accurately determined.

According to the present invention, the reference pump current (or reference pump voltage) is determined based on one of the pump discharge amount and the engine consumed fuel amount and the fuel pressure in the fuel pipe.
May be calculated and the reference pump current (or reference pump voltage) and the actual pump current (or actual pump voltage) may be compared to determine whether there is an abnormality in the fuel supply system. That is, the pump load is determined by the pump discharge amount and the fuel pressure, and the pump current (or pump voltage) is controlled according to the pump load. In general, a reference pump current (or reference pump voltage) is determined based on a pump discharge amount (or an engine consumption fuel amount which is substitute information) and a fuel pressure.
Is calculated and the pump current (or pump voltage) is controlled on the basis of this. Therefore, if the fuel supply system is functioning normally, the reference pump current (or reference pump voltage)
And the actual pump current (or actual pump voltage) becomes smaller. Therefore, the presence or absence of an abnormality in the fuel supply system can be accurately determined based on whether or not the difference is within a predetermined normal range.

In addition, according to the present invention, the fuel is determined based on the behavior of the pump voltage or the pump current or the feedback correction amount when at least one of the fuel pressure, the engine consumption fuel amount, and the pump rotation speed is substantially constant. The presence or absence of an abnormality in the supply system may be determined. That is,
If the fuel supply system is functioning normally, the pump voltage, the pump current, and the feedback correction amount will be almost constant when the fuel pressure, the fuel consumption of the engine, and the pump rotation speed are almost constant. By monitoring the behavior of the pump voltage, the pump current, and the feedback correction amount when the fuel amount and the pump rotation speed are constant, it is possible to accurately determine whether the fuel supply system is abnormal.

Further, the fuel supply system may be configured to determine whether there is an abnormality in the fuel supply system by comparing the amount of fuel discharged from the fuel pump with the amount of fuel consumed by the engine. In a fuel supply system with a returnless piping configuration that omits the return piping that returns the surplus of fuel sent from the fuel pump to the fuel injection valve side into the fuel tank, the pump discharge amount is relatively close to the engine consumption fuel amount. Is controlled to be
If the state in which the difference between the pump discharge amount and the engine consumption fuel amount is large continues for a long time, it can be determined that the fuel supply system is abnormal.

Further, the present invention may be configured to determine whether there is an abnormality in the fuel supply system by comparing the target torque of the fuel pump with the actual torque. If the deviation between the target torque and the actual torque continues for a long time,
It can be determined that the fuel supply system is abnormal.

According to a twenty-first aspect, the presence or absence of abnormality in the fuel supply system is determined based on the behavior of the pump rotation speed when the pump current (or pump voltage) of the fuel pump is equal to or higher than a predetermined value. Is also good. In general, when the pump current (or pump voltage) increases, the pump rotation speed also increases. Therefore, if the behavior of the pump rotation speed when the pump current (or pump voltage) is equal to or higher than a predetermined value is monitored, an abnormality in the fuel supply system can be obtained. Can be accurately determined.

Further, it may be determined whether or not there is an abnormality in the fuel supply system on the basis of the behavior of the fuel pressure in the fuel pipe after the fuel pump is stopped or started. That is, if the degree of decrease in the fuel pressure after the fuel pump is stopped or the degree of increase in the fuel pressure after the start of the fuel pump is monitored, the presence or absence of an abnormality in the fuel supply system can be accurately determined.

Further, the fuel supply system (residual pressure) after stopping the fuel pump and the relief pressure of the relief valve may be compared to determine whether there is an abnormality in the fuel supply system. If the relief valve is functioning normally, the fuel pressure (residual pressure) after the fuel pump is stopped will be lower than the relief pressure. Can be accurately determined.

Further, the present invention compares the actual pressure loss in the fuel filter with the estimated pressure loss in the fuel filter estimated from the amount of fuel consumed by the engine to determine whether there is an abnormality in the fuel supply system. You may do it. If the fuel filter is in a normal state, the actual pressure loss in the fuel filter is within a predetermined normal range with respect to the estimated pressure loss calculated from the fuel consumption of the engine. By comparing the estimated pressure loss with the estimated pressure loss, it is possible to accurately determine whether or not the fuel filter has failed.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment (1)] An embodiment (1) of the present invention will be described below with reference to FIGS.
First, the configuration of the entire fuel supply system will be described with reference to FIG. A fuel pump 12 is installed in the fuel tank 11,
A filter 13 is attached to a suction port of the fuel pump 12. The fuel pump 12 includes a DC motor (not shown) as a drive source. The fuel discharged from the fuel pump 12 is supplied from a fuel pipe 15 → a fuel filter 16 →
The fuel is supplied to a delivery pipe 18 through the fuel pipe 17, and injected into each cylinder from a fuel injection valve 19 of each cylinder attached to the delivery pipe 18. The fuel piping system has a returnless piping configuration in which a return piping for returning surplus fuel from the delivery pipe 18 to the fuel tank 11 is eliminated in order to simplify the configuration.

The engine control circuit 20 (internal combustion engine control circuit) reads various kinds of sensor information such as the engine speed output from the engine speed sensor 21 and the throttle opening output from the throttle sensor 22.
An ignition timing, a fuel injection amount, a target fuel pressure, and the like are calculated to drive each fuel injection valve 19 and to control a constant current control circuit 23 (fuel pump control circuit) that drives the fuel pump 12.

The fuel pump control circuit includes a fuel pump 1
A constant-voltage control circuit that varies the control amount so that the terminal voltage of the fuel cell 2 matches a predetermined voltage; and a control amount so that the fuel pressure (fuel pressure) in the fuel pipe (for example, the delivery pipe) matches the target fuel pressure. A variable fuel pressure feedback control circuit may be used. Further, in the present embodiment, the engine control circuit 20 and the constant current control circuit 23 are provided separately, but they may be integrated.

As shown in FIG. 2, the constant current control circuit 23 includes a battery 24, an ignition switch 25,
Fuse 26, relay switch 27 of main relay 27
a. The drive coil 27b of the main relay 27 is connected to the engine control circuit 20, and when the ignition switch 25 is turned on, the engine control circuit 2
0 based on the output of the drive coil 27 of the main relay 27.
b, power is supplied from the battery 24 to the constant current control circuit 23 by turning on the relay switch 27a.

The control unit 28 of the constant current control circuit 23 converts the control signal (duty signal indicating the target fuel pressure) input from the engine control circuit 20 into a drive circuit 28a.
(Drive circuit unit) converts the current into a target current value, and outputs a drive signal at a duty ratio according to the target current value to generate a MOSFET.
By driving the switching element 29 such as T, the DC motor of the fuel pump 12 is driven by the PWM method,
It functions as feedback control means for detecting the control current value actually flowing to the fuel pump 12 and performing feedback control so that the control current value matches the target current value.

In this case, the value of the current flowing through the fuel pump 12 (the value of the current flowing through the current detecting resistor 30) is calculated from the voltage value applied to both ends of the current detecting resistor 30 and the resistance value of the current detecting resistor 30. Then, the control unit 28 of the constant current control circuit 23 transmits a monitor signal for monitoring the operation state of the constant current control circuit 23 to the engine control circuit 20. The constant current control circuit 23 is connected to a noise filter 33 including a coil 31 and capacitors 32a and 32b, and a flyback diode 34. Further, the constant current control circuit 23 is configured so that the switching element 29 is always on when the drive circuit 28a fails.

The control section 28 of the constant current control circuit 23 executes the program shown in FIGS. 3 to 6 to determine whether there is an abnormality in the fuel supply system based on the power signal and the control signal from the engine control circuit 20. Function as an abnormality detecting means for determining the state. Note that a power line abnormality flag XFIG, described later,
The control signal line abnormality flag XFDUTY and the unknown cause abnormality flag XFIGDUTY are each initialized to 0 meaning normal at the time of factory production. The statuses of the power line abnormality flag XFIG, the control signal line abnormality flag XFDUTY, and the unknown cause abnormality flag XFIGDUTY are stored and held in the backup memory even when the ignition switch 25 is turned off, and are reset to 0 when the repair is completed.

The unidentified abnormality flag setting program shown in FIG. 3 is executed at predetermined time intervals. When this program is started, first, in step 101, as shown in FIG. 7A, the power is turned on (the ignition switch 25 is turned on).
In addition, it is determined whether or not the control signal has not been input or the power is off and the control signal has been input as shown in FIG. 7B. If the system is normal, the power is turned on and the control signal is input, or the power is turned off and the control signal is not input. Therefore, in step 101, the power is turned on and the control signal is not input, or If it is determined that the power is off and the control signal is input, it is considered that an abnormality has occurred in either the power supply line or the control signal line. In this case, the process proceeds to step 102, where the power supply line abnormality flag XFIG = 0 (there is no abnormality in the power supply line) and the control signal line abnormality flag XFDUTY =
0 (no abnormality in the control signal line), and if it is determined that the power line abnormality flag XFIG = 0 and the control signal line abnormality flag XFDDUTY = 0, which one of the power line and the control signal line is used. Since it is not yet determined whether or not an abnormality has occurred, the process proceeds to step 103, in which the unknown cause abnormality flag XFIGDUTY is set to 1 (it is determined that there is an abnormality in either the power supply line or the control signal line), and the program ends. I do.

On the other hand, if "No" is determined in step 101, it is determined that the system is functioning normally, and the routine proceeds to step 104, where the unknown cause abnormality flag XFI
GDUTY is reset to 0 and the program ends. In step 102, the power line abnormality flag XFI
If it is determined that G = 1 (there is an abnormality in the power supply line) or the control signal line abnormality flag XFDUTY = 1 (there is an abnormality in the control signal line), the process proceeds to step 104 because the cause of the abnormality has already been identified. , Unknown flag XFIGDUT
Y is reset to 0 and the program ends.

The abnormality detection program shown in FIGS. 4 to 6 is executed at predetermined time intervals. When this program is started,
First, at step 201, an unknown cause abnormality flag XFIG
It is determined whether or not DUTY is 1, and if it is determined that the unknown cause abnormality flag XFIGDUTY = 0, step 20 is executed.
This program ends without executing the processing of the second and subsequent steps.

On the other hand, if it is determined in step 201 that the unknown cause abnormality flag XFIGDUTY = 1 (there is an abnormality in either the power supply line or the control signal line), step 20 is executed.
2 to determine whether or not the power is on. If the power is on, the process proceeds to step 203 and the power-on flag XI
G is set to 1 and if the power is off, the process proceeds to step 204 and the power-on flag XIG is reset to 0.

Thereafter, the routine proceeds to step 205, where the power is turned on from off depending on whether or not the difference between the present power on flag XIG and the previous power on flag XIGO is larger than 0 (XIG-XIGO> 0). It is determined whether or not it has just been switched, and immediately after the power is turned on (XIG-
XYGO> 0) only when it is determined that
Then, the power-on counter CIG for counting the number of times the power is turned on is incremented. Thereafter, the process proceeds to step 207, where the value of the previous power-on flag XIGO is updated with the value of the current power-on flag XIG.

Thereafter, the routine proceeds to step 208 in FIG. 5, where it is determined whether or not a control signal has been input from the engine control circuit 20. If a control signal has been input, the routine proceeds to step 209 and the control signal input flag XDUTY Is set to 1, and if there is no control signal input, the routine proceeds to step 210, where the control signal input flag XDUTY is reset to 0.

Thereafter, the routine proceeds to step 211, where it is determined whether or not the difference between the current control signal input flag XDUTY and the previous control signal input flag XDUTY is larger than 0 (XDU).
TY-XDUTYO> 0), it is determined whether or not the state has just been switched from the state without the input of the control signal to the state with the input, and immediately after the state has been switched to the state with the input of the control signal (XDUTY-XDUTYO). Only when it is determined to be> 0), the process proceeds to step 212, where the control signal on counter CDUTY for counting the number of times the control signal is turned on is incremented. Thereafter, the process proceeds to step 213, where the value of the previous control signal input flag XDUTY is updated with the value of the current control signal input flag XDUTY.

Thereafter, the routine proceeds to step 214, where it is determined whether or not the count value of the power-on counter CIG (the number of times of power-on) exceeds a predetermined value α. If the number of times of power-on has not reached α times, steps 215 to 215 are performed. The process proceeds to step 220 in FIG. 6 without performing the process of 219.

On the other hand, if it is determined in step 214 that the number of times of power-on has exceeded α times, the flow advances to step 215 to turn on the power-on counter CIG and the control signal on-counter C.
It is determined whether the count value of DUTY is the same, that is, whether the number of power-on times and the number of control signal on times are the same, and the number of power-on times and the control signal on time are the same (CIG = CDUT
If Y), it is determined that there is no abnormality in the power supply line and the control signal line, and the routine proceeds to step 216, where the unknown cause abnormality flag XF
IDUTY is reset to 0 and the program ends.

On the other hand, in step 215, the number of power-on times and the number of control signal-on times are different (CIG @ CDUT
If determined as Y), the process proceeds to step 217, where it is determined whether or not the control signal on-counter CDUTY is 0. If it is determined that the control signal on-counter CDUTY = 0, the power-on count exceeds α times Since the control signal is always on or always off, the process proceeds to step 218, where it is determined that there is an abnormality such as disconnection of the control signal line, short-circuit between the control signal line and the ground or power supply line, and a warning is issued. A warning is given to the driver by lighting a lamp or the like. Further, the unknown cause abnormality flag XFIGDUTY is reset to 0, and the control signal line abnormality flag XFDDUTY is set to 1 (abnormality of the control signal line), and the program ends. In this case, the fuel pump 12 is driven at the maximum duty, and the control on the engine side is also switched to the control corresponding to the pump maximum output.

If it is determined in step 217 that the control signal on counter is CDUTY ≠ 0, the cause of the abnormality is not known. Therefore, the process proceeds to step 219 with the unknown cause abnormality flag XFIGDUTY set to 1, and the process proceeds to step 219. Is determined, and a warning lamp or the like is turned on to warn the driver, and both the count values of the power-on counter CIG and the control signal on-counter CDUTY are cleared, followed by terminating the present program. In this case, the fuel pump 12 is stopped.

When the process proceeds from step 214 to step 220 in FIG. 6 (when the number of power-on times is equal to or less than α times), first, at step 220, the count value of the control signal-on counter CDUTY (the number of times the control signal is turned on) Is greater than a predetermined value β, and the number of times the control signal is turned on is β
If the number is less than or equal to the number of times, the program ends without performing the processing of steps 221 to 223.

On the other hand, if it is determined in step 220 that the number of times the control signal is turned on is larger than β times,
It proceeds to 1 to determine whether or not the power-on counter CIG is 0. If the power-on counter CIG is determined to be 0 even if the number of times the control signal is turned on exceeds β times, the power is always on or always off. Therefore, the process proceeds to step 222, where it is determined that there is an abnormality such as a short circuit between the power supply line and the backup power supply, a short circuit between the power supply terminal of the fuel pump 12 and the backup power supply, and the warning lamp and the like are turned on. Warning the driver. Further, an unknown cause abnormal flag XFIGD
UTY is reset to 0 and the power line abnormality flag X
FIG is set to 1 (there is an abnormality in the power supply line), and the program ends. In this case, the fuel pump 12 is driven based on only the control signal.

At step 221, the power-on counter CI
If it is determined that G ≠ 0, the cause of the abnormality is not known, so the process proceeds to step 223 with the unknown cause abnormality flag XFIGDUTY being set to 1, and it is determined that there is an unknown cause abnormality, and a warning lamp or the like is turned on. Then, the driver is warned, the count values of the power-on counter CIG and the control signal on-counter CDUTY are both cleared, and the program ends. In this case, the fuel pump 12 is stopped.

According to the embodiment (1) described above, if the system is functioning normally, it is noted that switching between the presence / absence of the control signal input and the absence of the control signal is performed in accordance with the on / off of the power supply. Since the presence or absence of an abnormality is determined by comparing the number of times the signal is turned on with the number of times the control signal is turned on, it is possible to accurately detect an abnormality in the power supply line and the control signal line.

Further, in the present embodiment (1), when the drive circuit 28a fails, the switching element 29 is always turned on, so that even if the drive circuit 28a fails, Fuel pump 12
Can be driven to supply fuel to the engine,
The vehicle can run, and can travel by itself to a service factory or the like.

[Embodiment (2)] By the way, if the noise filter 33 or the like breaks down, the switching noise of the switching element 29 and the like is placed on the power supply line, and the fluctuation range of the power supply voltage becomes large. Focusing on this point, in the embodiment (2) of the present invention, the presence or absence of an abnormality is determined by comparing the fluctuation width of the power supply voltage with a predetermined normal fluctuation width.

The abnormality detection program of FIG. 8 executed in the embodiment (2) is executed at a predetermined power supply voltage sampling timing. When the program is started, first, in step 301, the power supply voltage is read, and in the next step 302, the fluctuation range of the power supply voltage is set to the maximum value and the minimum value of the power supply voltage sampled from a predetermined time to the present. It is determined from the difference from the value.

Thereafter, the routine proceeds to step 303, where it is determined whether or not the fluctuation width of the power supply voltage is equal to or smaller than a predetermined normal fluctuation width ΔV (see FIG. 9). If the fluctuation width of the power supply voltage is larger than the normal fluctuation width ΔV. , The process proceeds to step 304, and the noise filter 3
3 is determined to be abnormal, such as disconnection of the capacitor 32, short-circuit of the coil 31, short-circuit between the power supply (battery 24) and the power supply side terminal of the fuel pump 12, and turns on a warning lamp to warn the driver. The abnormality information is stored in the backup memory. On the other hand, if it is determined in step 303 that the fluctuation width of the power supply voltage is equal to or smaller than the normal fluctuation width ΔV, the process proceeds to step 305, and it is determined that there is no abnormality.

In the embodiment (2), when the fluctuation range of the power supply voltage becomes larger than the normal fluctuation range ΔV, it is determined that there is an abnormality. However, as shown in FIG. Analysis may be performed to determine that there is an abnormality when the power supply noise level exceeds a predetermined abnormality determination value.

[Embodiment (3)] When the ignition switch 25 is turned on (the power is turned on) and a control signal is output from the engine control circuit 20 when the system is normal, the constant current control circuit 23 switches from the sleep mode to the normal mode. The sleep mode signal (monitor signal) output from the constant current control circuit 23 to the engine control circuit 20 is switched from on to off (see the dotted line in FIG. 12).

Therefore, in the embodiment (3) of the present invention, the engine control circuit 20 executes an abnormality detection program shown in FIG. When the present program is started, first, in step 401, it is determined whether or not the ignition switch 25 is turned on (power is turned on) and a control signal is output, and the ignition switch 25 is turned on and a control signal is output. If so, the process proceeds to step 402, where it is determined whether or not the sleep mode signal from the constant current control circuit 23 has been switched off.

If the sleep mode signal has not been switched off, the routine proceeds to step 403, where the noise filter 3
3 is determined to be abnormal, such as disconnection of the coil 31, short-circuit of the capacitor 32, short-circuit of the diode 34, disconnection of the power supply line, disconnection of the control signal line, short-circuit of the power supply and ground, short-circuit of the fuel pump 12, etc. Is turned on to warn the driver, and the abnormality information is stored in the backup memory. On the other hand, if the sleep mode signal is switched off when the ignition switch 25 is turned on and the control signal is output, step 40
Proceed to 4 and determine that there is no abnormality.

[Embodiment (4)] Next, FIGS.
An embodiment (4) of the present invention will be described using FIG. In the embodiment (4), the abnormality detection program of FIG. 13 is executed. When this program is started, first, at step 50
1, the drive signal Oduty output by the drive circuit 28a
It is determined whether (duty ratio) is equal to or greater than a predetermined value. This predetermined value is set to a duty ratio sufficient to allow a current to flow through the fuel pump 12. If the duty ratio of the drive signal is equal to or greater than the predetermined value, the process proceeds to step 502, where the fuel pump 12
It is determined whether or not the actual pump current I flowing through is larger than a determination current value (for example, a current value slightly larger than 0).

If the actual pump current I is equal to or smaller than the determination current value, the process proceeds to step 503, where the coil 31 of the noise filter 33 is disconnected, the diode 34 is shorted, the connection terminal of the fuel pump 12 is disconnected, and the current detection resistor 30 is disconnected. It is determined that there is an abnormality such as disconnection, and a warning lamp or the like is turned on to warn the driver and the abnormality information is stored in the backup memory.

On the other hand, if the actual pump current I is larger than the determination current value, the process proceeds to step 504, where it is determined that there is no abnormality.

In the abnormality detection program of FIG. 13, when the drive signal Oduty is equal to or greater than the predetermined value and the pump current I is equal to or less than the determination current value, it is determined that an abnormality has occurred.
As shown in FIG. 5, when the actual pump current I is equal to or greater than the determination current value when the drive signal Oduty is equal to or less than the predetermined value, an abnormality is detected (short circuit of the diode 34, short circuit between the switching element side terminal of the fuel pump 12 and the ground, etc.). May be determined.

When the drive signal Oduty is equal to or higher than a predetermined value, one of the pump voltage, the pump rotation speed, the pump discharge amount, and the fuel pressure in the fuel pipes 15 and 17 (hereinafter abbreviated as “fuel pressure”). When one of them is equal to or less than a predetermined determination value, or when one of the pump voltage, the pump rotation speed, the pump discharge amount, and the fuel pressure is equal to or more than the predetermined determination value when the drive signal Oduty is equal to or less than the predetermined value, It may be determined that there is an abnormality.

[Embodiment (5)] If the system is functioning properly, the estimated pump voltage obtained by multiplying the power supply voltage (the voltage of the battery 24 + B) by the duty ratio Oduty of the drive signal is used as the fuel pump. The 12 actual pump voltages are
It falls within a predetermined normal range.

Focusing on this point, the embodiment (5) of the present invention executes the abnormality detection program shown in FIG. First, in step 601, the estimated pump voltage Vs is obtained by multiplying the power supply voltage (+ B) by the duty ratio Oduty of the drive signal. Thereafter, the routine proceeds to step 602, where the actual pump voltage V becomes a predetermined value with respect to the estimated pump voltage Vs depending on whether the absolute value of the difference between the actual pump voltage V of the fuel pump 12 and the estimated pump voltage Vs is equal to or smaller than a predetermined value. It is determined whether it is within the normal range (see FIG. 17).

If the actual pump voltage V is out of the normal range, the routine proceeds to step 603, where it is determined that there is an abnormality such as a short circuit of the diode 34, a short circuit between the terminal of the switching element 29 of the fuel pump 12 and the ground, and a warning lamp. Is turned on to warn the driver, and the abnormality information is stored in the backup memory. On the other hand, when it is determined that the actual pump voltage V is within the normal range, the process proceeds to step 604, and it is determined that there is no abnormality.

[Embodiment (6)] In the embodiment (6) of the present invention, an abnormality detection program shown in FIG. 18 is executed. First, in step 701, it is determined whether or not the feedback correction amount FBi of the control current of the fuel pump 12 is equal to or less than a lower limit predetermined value. As shown in FIG. 19, the lower-limit predetermined value is set to a correction amount (negative value) acting in a direction to decrease the control current of the fuel pump 12. If the feedback correction amount FBi is equal to or less than the lower limit predetermined value, the process proceeds to step 702, and it is determined whether or not the state in which the feedback correction amount FBi is equal to or less than the lower limit predetermined value has continued for a predetermined time.

If the state in which the feedback correction amount FBi is equal to or less than the lower limit predetermined value has continued for a predetermined time or more, the state in which the current value is excessive has continued. It is determined that there is an abnormality such as a short-circuit between the 12 switching element 29 side terminal and the ground, and a warning lamp or the like is turned on to warn the driver, and the abnormality information is stored in the backup memory. On the other hand, if the state in which the feedback correction amount FBi is equal to or less than the lower limit predetermined value does not continue for the predetermined time, the process proceeds to step 704, and it is determined that there is no abnormality.

In the above embodiment (6), when the state where the feedback correction amount FBi is equal to or less than the lower limit predetermined value continues for a predetermined time or more, it is determined that there is an abnormality. May be determined to be abnormal when out of the normal range.

Further, in the system in which the constant current control circuit 23 functions as a time-dependent change correcting means for correcting a shift of the control current of the fuel pump 12 due to the time-dependent change of the fuel supply system, as shown in FIG. When the correction amount ILOSS is out of the predetermined normal range (for example, when the correction amount ILOSS is equal to or lower than the lower limit predetermined value), it may be determined that abnormal deterioration requiring correction beyond the design tolerance has occurred. good.

[Embodiment (7)] In the embodiment (7) of the present invention, when the power supply is turned on (when the ignition switch 25 is turned on), the constant current control circuit 23 outputs the signal from the constant current control circuit 23 to the engine. The configuration is such that the diagnostic code (monitor signal) output to the control circuit 20 does not become a low level (a state where there is no output). Therefore, if the system is normal, when the power is turned on, the diag code is in a state with output (high level) as shown by the dotted line in FIG.

It should be noted that the diagnostic code is designed so that not only two levels of high / low but also a fault state can be determined.
Three or more levels may be provided. In this case, when the system is normal, the analog signal has a predetermined voltage indicating normality, and the duty signal has a predetermined duty ratio.

In this embodiment (7), by executing the abnormality detection program shown in FIG. 21, when the ignition switch 25 is turned on (power is turned on) and the control signal is output, the output of the diagnostic code is output. It is determined whether or not there is (steps 801 and 802). If no diagnostic code is output, it is determined that there is an abnormality, and a warning lamp or the like is turned on to warn the driver and the abnormality information is stored in the backup memory. (Step 803).

In this case, as causes of the abnormality, disconnection of the backup power supply line, short-circuit of the power supply and ground, disconnection of the monitor signal line, short-circuit of the power supply and control signal line, short-circuit of the power supply and monitor signal line, short-circuit of the power supply and the fuel pump 12 Short of the ground side terminal, short of the power supply side terminal of the fuel pump 12 and the ground, short of the control signal line and the terminal of the fuel pump 12, short circuit of the monitor signal line and the terminal of the fuel pump 12, short circuit of the monitor signal line and the ground. However, the microcomputer of the control unit 28 of the constant current control circuit 23 may be out of order. In this case, the control signal corresponding to the maximum duty is output from the engine control circuit 20 to drive the fuel pump 12, and the control on the engine side may be switched to the control corresponding to the pump maximum output.

[Embodiment (8)] In the embodiment (8) of the present invention, an abnormality detection program shown in FIG. 23 is executed. First, in step 901, it is determined whether or not the actual pump current I is equal to or smaller than a predetermined value (for example, a current value slightly larger than 0). It is determined whether the ejection amount is smaller than the determination value.

If the actual pump current I is equal to or less than the predetermined value but the pump discharge amount is equal to or greater than the determination value (see FIG. 24), the flow advances to step 903 to short-circuit the power supply terminal of the fuel pump 12 with the power supply. Then, it is determined that there is an abnormality such as a short circuit of the current detection resistor 30, a fuel leak, a failure of the relief valve or the like, a warning lamp or the like is turned on to warn the driver, and the abnormality information is stored in the backup memory. on the other hand,
If the pump discharge amount is smaller than the determination value, step 9
Proceed to 04 and determine that there is no abnormality. The actual pump current I
May be determined whether or not the fuel pressure is greater than a determination value when is less than or equal to a predetermined value to determine whether there is an abnormality.

[Embodiment (9)] The pump load is determined by the pump discharge amount and the fuel pressure of the fuel pump 12, and the pump current (or pump voltage) is controlled according to the pump load. In general, a reference pump current (or reference pump voltage) is calculated based on a pump discharge amount (or an engine consumption fuel amount which is substitute information) and a fuel pressure, and the pump current (or pump voltage) is controlled based on the reference pump current. Is done. Therefore, if the system is functioning normally, the actual pump current (or actual pump voltage) is within a predetermined normal range with respect to the reference pump current (or reference pump voltage) obtained from the pump discharge amount and the fuel pressure. Become.

Focusing on this point, the embodiment (9) of the present invention executes the abnormality detection program shown in FIG. First, in step 1001, a map of the reference pump current Iref (or reference pump voltage Vref) using the pump discharge amount Qfp as a parameter shown in FIG.
A reference pump current Iref (or reference pump voltage Vref) corresponding to the pump discharge amount Qfp when f is controlled to a predetermined target fuel pressure is obtained. At this time, the reference pump current Ire is used by using the fuel consumption amount of the engine instead of the pump discharge amount Qfp.
f (or the reference pump voltage Vref) may be obtained.

Thereafter, the routine proceeds to step 1002, where the absolute value of the difference between the actual pump current I (or actual pump voltage V) of the fuel pump 12 and the reference pump current Iref (or reference pump voltage Vref) is smaller than a predetermined value. It is determined whether or not the actual pump current I (or the actual pump voltage V) is within a predetermined normal range with respect to the reference pump current Iref (or the reference pump voltage Vref).

If the actual pump current I (or the actual pump voltage V) is out of the normal range, the process proceeds to step 1003,
It is determined that there is an abnormality such as a characteristic abnormality of the fuel pump 12 (including the motor), a failure of the check valve, a failure of the relief valve, a fuel leak, a blockage of the fuel pipes 15 and 17, and turns on a warning lamp to inform the driver. At the same time as warning, the abnormality information is stored in the backup memory. On the other hand, the actual pump current I
If (or the actual pump voltage V) is determined to be within the normal range, the process proceeds to step 1004, where it is determined that there is no abnormality.

As shown by the two-dot chain line in FIG. 26, the change ΔIref of the reference pump current Iref is calculated from the change ΔQ of the pump discharge amount Qfp when the fuel pressure Pf is controlled to be constant.
(Or the change amount ΔVref of the reference pump voltage Vref) is obtained, and the change amount ΔI of the actual pump current I (or the actual pump voltage Vref) is obtained.
Of the reference pump current Iref (or the change ΔV of the reference pump voltage Vref).
ref) may be determined based on whether or not it is within a predetermined normal range.

[Embodiment (10)] When the system is normal, the load on the fuel pump 12 is substantially constant when the target fuel pressure is substantially constant.
(Actual pump voltage V) is also controlled to be substantially constant.

Therefore, in the embodiment (10) of the present invention,
As shown in FIG. 27, when the target fuel pressure is constant, the change amount ΔI of the actual pump current I (or the change amount Δ
V) is greater than or equal to a determination value, and when the variation ΔI of the actual pump current I (or variation ΔV of the actual pump voltage V) is greater than or equal to the determination value, it is determined that there is an abnormality, and the pump current I
If the variation ΔI (or the variation ΔV of the actual pump voltage V) is smaller than the determination value, it is determined that there is no abnormality.

When the fuel consumption Q is substantially constant, the target fuel pressure is set to be constant. Therefore, when the fuel consumption Q is substantially constant, the variation ΔI (or the actual pump current I) of the actual pump current I is changed. The presence or absence of the abnormality may be determined based on whether or not the amount of change ΔV of the pump voltage V) is equal to or greater than the determination value. When the pump rotation speed is substantially constant, the change amount ΔI of the actual pump current I (or the change amount Δ
The presence or absence of an abnormality may be determined based on whether V) is equal to or greater than a determination value.

Further, the changing speed dV / d of the actual pump voltage V
t, the change speed dI / dt of the actual pump current I, the change amount of the drive signal (feedback correction amount FBi), or the change speed dFBi / dt of the drive signal. May be determined.

[Embodiment (11)] Engine control circuit 2
If the fuel pressure Pf (or the amount of fuel consumed by the engine Q) does not increase even though the drive signal from 0 frequently corresponds to the maximum output, it is considered that the fuel pump 12, the fuel pipes 15, 17 and the like are abnormal. Can be

Therefore, in the embodiment (11) of the present invention,
As shown in FIG. 28, when the state where the drive signal Oduty is equal to or more than the predetermined value continues for a predetermined time or more, or when the state where the drive signal Oduty is equal to or more than the predetermined value occurs a predetermined number of times or more, the fuel pressure P
It is determined whether or not the fuel pressure Pf (or the fuel consumption Q) is greater than the determination value. If the fuel pressure Pf (or the fuel consumption Q) is equal to or less than the determination value, it is determined that there is an abnormality, and the fuel pressure P
If f (or the amount of fuel consumed by the engine Q) is larger than the determination value, it is determined that there is no abnormality.

[Embodiment (12)] The fuel pump 1
In a system with a returnless piping configuration in which the return piping for returning the excess fuel supplied from 2 to the delivery pipe 18 to the fuel tank 11 is eliminated, the pump discharge amount is controlled so as to be relatively close to the fuel consumption of the engine. I do.

Focusing on this point, the embodiment (1) of the present invention
In 2), as shown in FIG. 29, it is determined whether or not the absolute value ΔQ of the difference between the pump discharge amount Qfp and the engine consumption fuel amount Q is smaller than the determination value, and the pump discharge amount Qfp and the engine consumption fuel amount Q If the absolute value ΔQ of the difference is equal to or greater than the determination value, it is determined that there is an abnormality. If the absolute value ΔQ of the difference between the pump discharge amount Qfp and the engine consumption fuel amount Q is smaller than the determination value, it is determined that there is no abnormality.

[Embodiment (13)] In embodiment (13) of the present invention, as shown in FIG.
It is determined whether or not the absolute value ΔT of the difference between the actual torque T of the (motor) and the target torque Tref is smaller than a determination value. If the absolute value ΔT of the difference between the actual torque T and the target torque Tref is equal to or greater than the determination value. Is determined to be abnormal, the actual torque T and the target torque T
If the absolute value ΔT of the difference between ref is smaller than the determination value, it is determined that there is no abnormality.

[Other Embodiments] Engine Control Circuit 2
0 and the constant current type control circuit 23 are configured such that the control signal and the monitor signal do not become any of the ground level and the power supply voltage level, respectively, and the control signal and the monitor signal become the ground level or the power supply voltage level. The presence or absence of an abnormality in the fuel supply system may be determined based on whether or not the abnormality has occurred.

When the difference between the value of the current flowing through the power supply line and the value of the pump current flowing through the fuel pump 12 is equal to or smaller than the determination value, it may be determined that there is an abnormality (such as short-circuit of the diode 34).

When the actual pump voltage V drops by a predetermined value or more when the amount of fuel consumed by the engine is constant, or
When the change amount of the actual pump voltage V is equal to or less than a predetermined value, it may be determined that the fuel pump 12 is in the half lock state.

Alternatively, when the actual pump current I increases by a predetermined value or more or the feedback correction amount FBi of the control current decreases by a predetermined value or more when the target fuel pressure and the amount of fuel consumed by the engine are substantially constant, the fuel pump It may be determined that 12 is in the half lock state.

Further, when it is determined that there is an abnormality such as half-lock, the fuel pump 12 may be driven at the maximum duty, and the control on the engine side may be switched to the control corresponding to the pump maximum output. If the state where the actual pump current I (or the actual pump voltage V) is equal to or more than the predetermined value continues for a predetermined time or more while the fuel pump 12 is driven at the maximum duty, it is determined that the fuel pump 12 is locked. The determination may be made.

The actual pump current I or the actual pump voltage V
May be determined that the fuel pump 12 is locked even when the pump rotation speed is equal to or less than the predetermined value (for example, substantially 0).

Further, when the amount of fuel consumed by the engine is substantially constant, when the actual pump voltage V increases by a predetermined value or more, or when the amount of change in the actual pump voltage V is a predetermined value or more, vapor lock occurs. May be determined. Alternatively, when the actual pump current I decreases by a predetermined value or more or the feedback correction amount FBi of the control current increases by a predetermined value or more when the target fuel pressure and the amount of fuel consumed by the engine are substantially constant, vapor lock occurs. May be determined.

When the fuel pressure is equal to or less than a predetermined value (for example, approximately 0) while the fuel pump 12 is functioning normally,
It may be determined that there is an abnormality such as a failure of the check valve or a blockage of the fuel pipes 15 and 17.

When the fuel pump 12 is stopped,
If the rate of decrease of the fuel pressure (residual pressure) is equal to or higher than a predetermined value, or if the time until the residual pressure becomes equal to or lower than a predetermined value (for example, 0) is within a predetermined time, failure of the check valve or relief valve, fuel leakage, It may be determined that there is an abnormality such as air mixing or generation of vapor in the pipes 15 and 17.

When the amount of fuel consumed by the engine suddenly decreases due to a fuel cut or the like, when the rate of decrease in fuel pressure is equal to or higher than a predetermined value, or the time until the fuel pressure becomes equal to or lower than a predetermined value (for example, target fuel pressure) is within a predetermined time. In this case, it may be determined that there is an abnormality such as a failure of the check valve or the relief valve, fuel leakage, air mixing in the fuel pipes 15 and 17 or generation of vapor.

In addition, when the time until the fuel pressure rises to a predetermined value or more when the fuel pump 12 is started is longer than a predetermined time, or when the start-up control duration of the fuel pump 12 is longer than a predetermined time, a check is made. It may be determined that there is an abnormality such as a failure of a valve or a relief valve, a fuel leak, air mixing in the fuel pipes 15 and 17 or generation of vapor.

If the relief valve is functioning normally, the fuel pressure after the fuel pump 12 is stopped becomes equal to or lower than the relief pressure. Therefore, when the fuel pump 12 is stopped, the fuel pressure (residual pressure) becomes lower than the relief pressure of the relief valve. If the pressure is higher than the pressure, it may be determined that the relief valve has failed.

[0103] When the concentration of the HC in the fuel supply system is equal to or higher than a predetermined value, it may be determined that fuel leakage has occurred. Further, when the pump discharge amount of the fuel pump 12 is equal to or more than the maximum consumed fuel amount, it may be determined that there is an abnormality such as a failure of the relief valve or a fuel leak.

When the amount of fuel consumed by the engine suddenly decreases due to a fuel cut or the like, and the fluctuation range of the fuel pressure is equal to or less than a predetermined value or when the changing speed of the fuel pressure is equal to or less than the predetermined value, the fuel pipe 1
It may be determined that there is an abnormality such as air mixing or vapor generation in the sections 5 and 17. Further, when the discharge pulsation of the fuel pump 12 is not detected, it may be determined that there is an abnormality such as mixing of air in the fuel pipes 15 and 17 or generation of vapor.

When the difference between the estimated pressure loss in the fuel filter calculated from the fuel consumption of the engine and the actual pressure loss in the fuel filter is equal to or larger than a predetermined value, it is determined that the fuel filter is abnormal. Is also good.

In addition, when the difference between the fuel pressure change amount obtained from the difference between the engine consumption fuel amount and the pump discharge amount and the actual fuel pressure change amount is equal to or more than a predetermined value, If not, it may be determined that some abnormality has occurred.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an entire fuel supply system showing an embodiment (1) of the present invention.

FIG. 2 is a circuit diagram showing an electrical configuration of a main part.

FIG. 3 is a flowchart showing a processing flow of an unknown cause abnormality flag setting program according to the embodiment (1).

FIG. 4 is a flowchart (part 1) illustrating a flow of processing of an abnormality detection program according to the embodiment (1).

FIG. 5 is a flowchart (part 2) illustrating a processing flow of an abnormality detection program according to the embodiment (1).

FIG. 6 is a flowchart (part 3) illustrating a processing flow of an abnormality detection program according to the embodiment (1).

FIGS. 7A and 7B are time charts showing behavior examples of a power supply and a control signal at the time of a system abnormality, respectively.

FIG. 8 is a flowchart showing a flow of processing of an abnormality detection program according to the embodiment (2).

FIG. 9 is a time chart showing a behavior example of a power supply voltage.

FIG. 10 is a diagram showing an example of a frequency characteristic of a power supply noise level for explaining another abnormality detection method of the embodiment (2).

FIG. 11 is a flowchart showing the flow of processing of an abnormality detection program according to the embodiment (3).

FIG. 12 is a time chart showing an example of behavior of an ignition switch on / off signal, a control signal, and a sleep mode signal;

FIG. 13 is a flowchart showing the flow of processing of an abnormality detection program according to the embodiment (4).

FIG. 14 is a time chart showing a behavior example of a drive signal and a pump current.

FIG. 15 is a time chart showing an example of behavior of a drive signal and a pump current for explaining another abnormality detection method of the embodiment (4).

FIG. 16 is a flowchart showing the processing flow of an abnormality detection program according to the embodiment (5).

FIG. 17 is a diagram showing a relationship between an estimated pump voltage and an actual pump voltage.

FIG. 18 is a flowchart showing the processing flow of an abnormality detection program according to the embodiment (6).

FIG. 19 is a time chart showing a behavior example of a feedback correction amount;

FIG. 20 is a time chart showing an example of a behavior of a temporal change correction amount for explaining another abnormality detection method of the embodiment (6).

FIG. 21 is a flowchart showing the processing flow of an abnormality detection program according to the embodiment (7).

FIG. 22 is a time chart showing an example of behavior of an ignition switch, a control signal, and a diagnostic code;

FIG. 23 is a flowchart showing the processing flow of an abnormality detection program according to the embodiment (8).

FIG. 24 is a time chart showing a behavior example of a pump current and a pump discharge amount.

FIG. 25 is a flowchart showing the flow of processing of an abnormality detection program according to the embodiment (9).

FIG. 26 is a diagram showing an example of a map of a reference pump current (or reference pump voltage) using a pump discharge amount as a parameter.

FIG. 27 is a time chart showing an example of behavior of a target fuel pressure, an amount of fuel consumed by an engine, a drive signal, an actual pump current, and an actual pump voltage for describing an abnormality detection method according to the embodiment (10).

FIG. 28 is a time chart showing an example of behavior of a drive signal and a fuel pressure (or an amount of fuel consumed by an engine) for describing an abnormality detection method according to the embodiment (11).

FIG. 29 is a time chart showing an example of a behavior of an absolute value of a difference between a pump discharge amount and an engine consumption fuel amount for describing an abnormality detection method according to the embodiment (12).

FIG. 30 is a time chart showing an example of the behavior of the absolute value of the difference between the actual torque and the target torque of the fuel pump for describing the abnormality detection method according to the embodiment (13).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Fuel tank, 12 ... Fuel pump, 15 ... Fuel pipe, 16 ... Fuel filter, 17 ... Fuel pipe, 18 ... Delivery pipe, 19 ... Fuel injection valve, 20 ... Engine control circuit (internal combustion engine control circuit), 23 ... Constant current type control circuit (fuel pump control circuit), 24 ... battery, 25 ... ignition switch, 28 ... control unit (abnormality detection means, feedback control means, aging correction means), 28a ... drive circuit (drive circuit unit), 29 ... Switching element.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 45/00 314 F02D 45/00 314S 364 364M F-term (Reference) 3G084 DA22 DA27 DA31 DA33 EA01 EA04 EA11 EB11 EB24 FA00 FA03 FA32 3G301 JA15 JB02 JB08 JB09 JB10 LB07 LC10 NA08 NB03 NB07 NB15 NC08 ND01 ND41 NE23 PB00Z PB08Z PE06B PE06Z PF16Z PG00Z PG01Z PG02Z

Claims (24)

[Claims] A fuel pump for delivering fuel to a fuel injection valve;
A fuel supply system comprising: a fuel pump control device that controls the fuel pump; an input / output signal of the fuel pump control device, a control amount of the fuel pump, an operation state of the fuel pump, an operation state of the internal combustion engine, An abnormality detection device for a fuel supply system, comprising: abnormality detection means for determining the presence or absence of an abnormality in the fuel supply system based on at least one of fuel supply states to a fuel injection valve. 2. The fuel pump control device includes: an internal combustion engine control circuit for controlling the internal combustion engine; and a fuel for outputting a drive signal for driving the fuel pump based on a control signal from the internal combustion engine control circuit. A pump control circuit, wherein the fuel pump control circuit includes a unit that detects a monitor signal for monitoring an operation state of the fuel pump control circuit, and the abnormality detection unit includes the fuel pump control used for abnormality determination. At least one of the control signal, the drive signal, the monitor signal, and the power signal as an input / output signal of the device.
The abnormality detection device for a fuel supply system according to claim 1, wherein one is used. 3. The fuel cell system according to claim 2, wherein the abnormality detection means includes a pump current,
The abnormality detection device for a fuel supply system according to claim 1, wherein at least one of a pump voltage, a pump rotation speed, a pump discharge amount, and a motor torque of the fuel pump is used. 4. The apparatus according to claim 1, wherein the abnormality detection means uses at least one of an engine consumption fuel amount and a battery voltage as information on an operation state of the internal combustion engine used for abnormality determination. An abnormality detection device for a fuel supply system according to any one of the above. 5. The relief valve for adjusting a fuel pressure in a fuel pipe, a pressure loss in a fuel filter, and a fuel pressure as information on a fuel supply state to the fuel injection valve used for the abnormality determination. The abnormality detection device for a fuel supply system according to any one of claims 1 to 4, wherein at least one of a relief pressure and an atmospheric hydrocarbon concentration is used. 6. An abnormality detecting device, comprising: feedback control means for feedback-controlling the driving power of the fuel pump; and / or aging correction means for correcting a shift in the driving power of the fuel pump due to aging of the fuel supply system. 6. The apparatus according to claim 1, wherein the control unit uses at least one of a feedback correction amount by the feedback control unit and a temporal change correction amount by the temporal change correction unit as a control amount of the fuel pump used for abnormality determination. An abnormality detection device for a fuel supply system according to any one of the above. 7. The fuel pump control device is configured such that the switching element is always turned on when a drive circuit unit that controls a switching element for turning on / off the energization of the fuel pump fails. The abnormality detection device for a fuel supply system according to any one of claims 1 to 6, wherein: 8. A fuel pump for sending fuel to a fuel injection valve,
An internal combustion engine control circuit that controls the internal combustion engine; and a fuel pump control circuit that drives the fuel pump based on a control signal from the internal combustion engine control circuit. In a fuel supply system including a monitor signal detecting unit for monitoring a state, the internal combustion engine control circuit and the fuel pump control circuit
The control signal and / or the monitor signal is configured not to be at any of the ground level and the power supply voltage level, and the fuel is determined based on whether the control signal or the monitor signal has reached the ground level or the power supply voltage level. An abnormality detection device for a fuel supply system, comprising: abnormality detection means for determining whether an abnormality has occurred in the supply system. 9. A fuel pump for sending fuel to a fuel injection valve,
A fuel supply system comprising: a fuel pump control device for controlling the fuel pump; and an abnormality detecting means for determining whether or not there is an abnormality in the fuel supply system based on a fluctuation range of a power supply voltage of the fuel supply system. An abnormality detection device for a fuel supply system. 10. A fuel pump for feeding fuel to a fuel injection valve, an internal combustion engine control circuit for controlling an internal combustion engine, and a fuel pump control circuit for driving the fuel pump based on a control signal from the internal combustion engine control circuit. And a monitor signal detecting means for monitoring an operation state of the fuel pump control circuit from the fuel pump control circuit. An on / off signal of a power supply of the fuel supply system and a monitor signal An abnormality detection device for a fuel supply system, comprising: abnormality detection means for determining the presence or absence of an abnormality in the fuel supply system based on one of the control signals and the control signal. 11. A fuel pump for feeding fuel to a fuel injection valve, an internal combustion engine control circuit for controlling an internal combustion engine, and a fuel pump control circuit for driving the fuel pump based on a control signal from the internal combustion engine control circuit. A fuel supply system comprising: a monitor signal detecting means for monitoring an operation state of the fuel pump control circuit from the fuel pump control circuit; and determining whether the fuel supply system is abnormal based on a behavior of the monitor signal. An abnormality detection device for a fuel supply system, comprising: an abnormality detection unit that determines the abnormality. 12. A fuel pump for sending fuel to a fuel injection valve, an internal combustion engine control circuit for controlling an internal combustion engine, and a drive signal for driving the fuel pump based on a control signal from the internal combustion engine control circuit. A fuel supply system comprising: a fuel pump control circuit for outputting a fuel; a pump current, a pump voltage, a pump rotation speed, a pump discharge amount, a fuel discharge amount, and a fuel pressure of the fuel pump; An abnormality detection device for a fuel supply system, comprising: abnormality detection means for determining whether an abnormality has occurred in the supply system. 13. A fuel pump for feeding fuel to a fuel injection valve, an internal combustion engine control circuit for controlling an internal combustion engine, and a drive signal for driving the fuel pump based on a control signal from the internal combustion engine control circuit. A fuel pump control circuit that outputs a fuel pump control circuit, wherein an estimated pump voltage estimated from a power supply voltage of the fuel supply system and the drive signal is compared with an actual pump voltage to determine whether an abnormality has occurred in the fuel supply system. An abnormality detection device for a fuel supply system, comprising: abnormality detection means for determining presence / absence. 14. A fuel pump for feeding fuel to a fuel injection valve, an internal combustion engine control circuit for controlling an internal combustion engine, and a drive signal for driving the fuel pump based on a control signal from the internal combustion engine control circuit. And a fuel pump control circuit for outputting the fuel pressure, the fuel pressure in the fuel pipe or the fuel consumption of the engine when the drive signal continuously exceeds a predetermined value for a predetermined time or a predetermined number of times. An abnormality detection device for a fuel supply system, comprising abnormality detection means for determining the presence or absence of an abnormality in the fuel supply system based on the behavior of the fuel supply system. 15. A fuel supply system comprising: a fuel pump for sending fuel to a fuel injection valve; and a fuel pump control device for controlling the fuel pump. Feedback control means for feedback-controlling the driving power of the fuel pump; Or a aging correction means for correcting a shift in the driving power of the fuel pump due to aging of the fuel supply system; and a behavior of the feedback correction amount by the feedback control means and / or the aging change correction amount by the aging change correction means. Abnormality detecting means for judging the presence or absence of an abnormality in the fuel supply system based on the abnormality. 16. A fuel supply system comprising: a fuel pump for sending fuel to a fuel injection valve; and a fuel pump control device for controlling the fuel pump, wherein a pump discharge amount of the fuel pump, a fuel pressure in a fuel pipe, An abnormality detection device for a fuel supply system, comprising: abnormality detection means for determining the presence or absence of an abnormality in the fuel supply system based on any one of a power supply current of the fuel supply system and a pump current. . 17. A fuel supply system comprising: a fuel pump for feeding fuel to a fuel injection valve; and a fuel pump control device for controlling the fuel pump, wherein one of a pump discharge amount of the fuel pump and an engine consumption fuel amount. Calculating a reference pump current or a reference pump voltage based on the one and the fuel pressure in the fuel pipe; comparing the reference pump current or the reference pump voltage with an actual pump current or an actual pump voltage; An abnormality detection device for a fuel supply system, comprising: abnormality detection means for determining the presence or absence of abnormality in the fuel supply system. 18. A fuel supply system comprising a fuel pump for sending fuel to a fuel injection valve and a fuel pump control device for controlling the fuel pump, comprising: a fuel pressure in a fuel pipe, a fuel consumption of an engine, and the fuel pump. Abnormality detection means for judging the presence or absence of an abnormality in the fuel supply system based on the behavior of the pump voltage or the pump current of the fuel pump or the feedback correction amount thereof when at least one of the pump rotation speeds is substantially constant. An abnormality detection device for a fuel supply system. 19. A fuel supply system comprising a fuel pump for sending fuel to a fuel injection valve and a fuel pump control device for controlling the fuel pump, wherein a pump discharge amount of the fuel pump is compared with an engine consumption fuel amount. A fuel supply system abnormality detecting device for determining whether there is an abnormality in the fuel supply system. 20. A fuel supply system comprising a fuel pump for sending fuel to a fuel injection valve and a fuel pump control device for controlling the fuel pump, wherein a target torque of the fuel pump is compared with an actual torque. An abnormality detection device for a fuel supply system, comprising: abnormality detection means for determining the presence or absence of an abnormality in the fuel supply system. 21. A fuel supply system comprising: a fuel pump for feeding fuel to a fuel injection valve; and a fuel pump control device for controlling the fuel pump, wherein a pump current or a pump voltage of the fuel pump is equal to or higher than a predetermined value. Abnormality detecting means for determining whether or not there is an abnormality in the fuel supply system based on the behavior of the pump rotation speed of the fuel supply system. 22. A fuel supply system comprising a fuel pump for sending fuel to a fuel injection valve and a fuel pump control device for controlling the fuel pump, wherein a fuel pressure in a fuel pipe after the fuel pump is stopped or started. An abnormality detection device for a fuel supply system, comprising abnormality detection means for determining the presence or absence of an abnormality in the fuel supply system based on the behavior of the fuel supply system. 23. A fuel supply system comprising: a fuel pump for sending fuel to a fuel injection valve; and a fuel pump control device for controlling the fuel pump, wherein a fuel pressure in a fuel pipe after the fuel pump is stopped and a relief valve Abnormality detection means for comparing the relief pressure of the fuel supply system with the relief pressure to determine whether the fuel supply system is abnormal. 24. A fuel supply system comprising: a fuel pump for sending fuel to a fuel injection valve; and a fuel pump control device for controlling the fuel pump, wherein a fuel pump in a fuel filter provided on a discharge side of the fuel pump is provided. A fuel loss detecting means for comparing the pressure loss of the fuel supply system with the estimated pressure loss in the fuel filter calculated from the fuel consumption of the engine to determine whether or not the fuel supply system is abnormal. System abnormality detection device.