JP2003329719A - Signal processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To process diagnostic signals from a plurality of devices so as to control an operating state of each device in an on-vehicle device. <P>SOLUTION: To an FCECU 10, the diagnostic signals are supplied from a high-voltage converter 12, a battery ECU 14, an FC cell ECU 18 and an HVECU 22. For example, the diagnostic signals regarding a motor are output from the converter 12 and the HVECU 22. When data on both diagnostic signals do not correspond, the FCECU 10 detects an operating state of the converter 12 and that of the HVECU 22 so as to decide whether an operating voltage is a minimum operating voltage or more at each device. The diagnostic signal from the device at the operating voltage lower than the minimum operating voltage is judged to be false so as to be neglected, and the diagnostic signal from the device operated at the minimum operating voltage or more is judged to be true so as to be adopted. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing device, and more particularly to a device for evaluating the validity of a diagnostic signal output from a vehicle-mounted device or the like.

[0002]

2. Description of the Related Art Conventionally, various control devices are mounted on vehicles. For example, in a hybrid vehicle in which a vehicle is driven by an engine and a motor, an HV (hybrid) ECU (electronic control device) or an FC (fuel cell) cell E
There is a CU, a battery ECU, a high-voltage converter, etc., and the detected physical quantity and diagnostic signal are FCEs as an integrated control device
It is supplied to the CU. The FCU ECU processes signals output from these control devices and sends control commands to each device.

Generally, when a plurality of devices measure the same physical quantity of the same object and output the result to one processing device, the processing device determines a true value by a majority logic circuit. The majority logic circuit is, in principle, a logical operation circuit having three or more odd inputs, and is a circuit which can obtain an output corresponding to a large number of inputs of 1 or 0. By using this majority logic circuit, for example, when three diagnostic signals are respectively supplied from three devices, two of which are “normal” signals and the other one is an “abnormal” signal, a large number of “normal” signals are true. It is determined to be the value of.

[0004]

However, such a majority logic circuit needs to be constructed by combining a plurality of AND gates and OR gates, for example, which causes a problem that the circuit configuration becomes complicated. FIG. 3 shows an example of a majority logic operation circuit. 3 for 3 inputs A, B, C
One AND gate and one OR gate are required. Further, the majority logic circuit requires three or more odd inputs. For example, when two devices output measurement results for the same physical quantity of the same object, it is possible to determine which output is true. There is a problem that cannot be done. In particular, in the case of the above-described in-vehicle device, for example, a diagnostic signal about a motor is output from the HVECU and the high-voltage converter, or a diagnostic signal about a battery is output from the HVECU and the battery ECU. In many cases, the F.A.D.C.D.signals are output, and the FCECU to which these signals are input is required to easily and surely determine the authenticity of the two F.A.D.

The present invention has been made in view of the problems of the prior art, and an object thereof is to be able to process signals from a plurality of devices with a simple structure, and in particular, the signal contents from the plurality of devices are inconsistent with each other. It is an object of the present invention to provide a device that can determine which is true in the case of doing so.

[0006]

In order to achieve the above object, the present invention is a device for processing a plurality of measurement results from a plurality of measuring devices for measuring the same physical quantity of the same object, Means for determining whether or not the measurement results match each other, and when the plurality of measurement results do not match, the operating voltage of each of the plurality of measuring devices is compared with its minimum operating voltage, Means for determining the measurement result of the measuring device having an operating voltage as true.

It is preferable that the present apparatus further comprises means for calculating an operating voltage of each of the plurality of measuring devices by using a voltage drop between the plurality of devices and a common power source.

Further, it is preferable that the present apparatus further comprises means for storing a voltage drop between the plurality of devices and a common power source for each of the plurality of measuring devices.

In this device, the plurality of measuring devices are
The device can measure the operating state of the on-vehicle motor and output a normal or abnormal signal.

Further, in the present device, the plurality of measuring devices may be devices that measure the state of the on-vehicle battery and output a normal or abnormal signal.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings by taking an on-vehicle device as an example.

FIG. 1 is a block diagram of an in-vehicle system according to this embodiment. The high-voltage converter 12 is a device that converts a high-voltage, and measures the temperature, current, and the like of a motor (not shown) that is a non-driving device, and sends the operating state of the motor to the FCECU 10 as a diagnostic signal. The high-voltage converter 12 also performs high-voltage conversion according to a command from the FCECU.

The battery ECU 14 measures the voltage, temperature, current, etc. of the high voltage battery 16, determines whether the high voltage battery 16 is normal or abnormal, and sends it to the FC ECU 10. In addition, FCECU1
The current vehicle mode (engine drive or motor drive) command is received from 0.

The FC cell ECU 18 includes a high pressure stack 20.
The FC ECU 1 measures the voltage and temperature of the (fuel cell) to determine whether the high-pressure stack 20 (fuel cell) is normal or abnormal.
Send to 0. Further, the current vehicle mode is received from the FC ECU 10.

The HVECU 22 performs data communication with the ECUs of various parts of the vehicle, such as the body ECU, the door ECU, and the meter ECU, and commands the power steering ECU to permit / deny. Further, the operating state of the inverter that drives the motor is calculated, and the normality / abnormality of the motor (or the inverter) is determined and transmitted to the FCECU 10.

The FC ECU 10 includes a normal / abnormal diagnostic signal of the motor (or the inverter) from the high voltage converter 12, a normal / abnormal diagnostic signal of the high voltage battery 16 from the battery ECU 14, and a normal / abnormal diagnostic signal of the high voltage stack 20 from the FC cell ECU 18. A signal and a normal / abnormal diagnosis signal of the motor (certain inverter) from the HVECU 22 are input, and each device is comprehensively controlled based on these diagnosis signals. Each device is connected to a common power source, that is, an in-vehicle auxiliary battery (terminal voltage 12V) and operates by the voltage from the auxiliary battery.

Generally, the diagnostic signals transmitted to the FCECU 10 are the same for a plurality of devices for the same object, but in some cases, the plurality of diagnostic signals may not match each other. For example, the normal / abnormal diagnosis signal of the motor (or the inverter) is transmitted from the high-voltage converter 12 and the HVECU 22, but since the motor is either operating normally or operating abnormally, normally both diagnostic signals are They should match, but due to the accuracy of the measured values and the operating state of each device, an abnormal diagnostic signal is sent from the high-voltage converter 12 and the HVE
There may be a case where a normal diagnostic signal is transmitted from the CU 22 (or vice versa). In such cases, FC
In the ECU 10, it is necessary to determine which diagnostic signal is true and to instruct each device.

In the present embodiment, when the plurality of diagnostic signals do not match each other in this way, the FCECU 10
Determines whether or not each device that has transmitted the diagnostic signal is operating normally (whether or not the diagnostic process has been performed normally) based on the operating voltage of each device. Specifically, the operating voltage of each device is calculated, and whether the calculated operating voltage is equal to or higher than a predetermined minimum operating voltage (lower limit value of voltage required for normal operation) predetermined for each device. Then, the authenticity of the diagnostic signal is determined. That is, when the device that has transmitted the diagnosis signal is operating at a voltage equal to or higher than the minimum operating voltage, the device normally executes the diagnosis and determines that the diagnosis signal is highly reliable. On the other hand, when the operating voltage is lower than the minimum operating voltage, the device does not normally execute the diag and it is determined that the diag signal is unreliable. Then, of the plurality of transmitted diagnostic signals, the diagnostic signal from the device that is normally operating at a voltage equal to or higher than the minimum operating voltage is determined to be true.

The operating voltage of each device is calculated as follows by utilizing the fact that each device is connected to a common power source. That is, the FCECU 10 first has its own connector voltage (the voltage of the connector portion connected to the auxiliary battery).
Is detected and the current voltage of the auxiliary battery is calculated based on the voltage drop (voltage drop) between the auxiliary battery and itself. For example, when the voltage of the connector part is 9V and the voltage drop of itself is 0.5V, the current voltage of the auxiliary battery is calculated to be 9.5V. Next, the current operating voltage of each device is calculated using the voltage drop data between the auxiliary battery and each device stored in advance in the memory.

Table 1 exemplifies the voltage drop (voltage drop) of each device.

[0021]

[Table 1] In the table, for example, the voltage drop of the HVECU 22 is 0.
5V, the voltage effect of the high-voltage converter 12 is 0.7
V. The table also shows the minimum operating voltage of each device. The minimum operating voltage of each device is similarly stored in the memory. After calculating the voltage of the auxiliary battery, the FCECU 10 calculates the operating voltage of each device by calculating the difference from the voltage drop stored for each device. For example, when the auxiliary battery voltage is 10V, HVECU
The operating voltage of 22 can be calculated as 9.5V, and the operating voltage of the high-voltage converter 12 can be calculated as 9.3V. Of course, FC ECU1
The connector voltage of 0 is V, the voltage drop of the FCECU10 is ΔV, and the voltage drop of the device that transmitted the diagnostic signal is ΔV.
As V ′, the operating voltage Vx of the device may be calculated by Vx = V + (ΔV−ΔV ′). That is, FC ECU
The memory 10 may store not the data of the voltage drop of each device but the difference value (ΔV−ΔV ′) from the voltage drop of the device itself. After calculating the operating voltage of each device, FCE
The CU 10 compares the calculated operating voltage with the minimum operating voltage stored in the memory for each device to determine whether the operating voltage is equal to or higher than the minimum operating voltage.

FIG. 2 shows the FC ECU of this embodiment.
A processing flowchart of 10 is shown. First, FC
The ECU 10 inputs diagnostic data from each device (S101). The diagnostic data is periodically input, for example, in a predetermined cycle (each device periodically executes the diagnostic program and transmits diagnostic data). For example, the diagnostic data about the motor (or the inverter) is input from the high-voltage converter 12 and the HVECU 22. Next, it is determined whether or not the contents of a plurality of (two in this case) diagnostic data that have been input match (S102). If the two pieces of diagnostic data match, for example, if the diagnostic data from the high-voltage converter 12 and the diagnostic data from the HVECU 22 are both "normal" signals, it can be determined that the motor (inverter) is operating normally. On the other hand, when the two diagnostic data do not match, for example, the high-voltage converter 12 indicates “abnormal” data and the HVECU 22 indicates “normal” data, the FCECU 10 determines which diagnostic data is true. The process moves to the determination process. That is, the operating voltage of each device is calculated using the data about the voltage drop stored in advance in the memory (S
103). When calculating the operating voltage of each device, first, the connector voltage of itself is detected, as described above. After that, the terminal voltage of the auxiliary battery is calculated and the operating voltage of each device is calculated using the voltage drop of each device, or
Alternatively, the operating voltage of each device is calculated using the difference value from the voltage drop of itself. As a result, for example, the operating voltage of the high-voltage converter 12 is calculated to be 8.3V, the operating voltage of the HVECU 22 is calculated to be 8.5V, and the like.

After calculating the operating voltage of each device, it is determined whether the operating voltage is equal to or higher than the minimum operating voltage Vmin of each device, and the diagnostic data of the device having the minimum operating voltage or higher is adopted (S104). In the above example, the operating voltage of the HVECU 22 is 8.5V, and the minimum operating voltage Vmin = 8.
However, the operating voltage of the high-voltage converter 12 is 8.3 V, which is the minimum operating voltage Vm.
It is lower than in = 9V. Therefore, in S104, the diagnostic data from the HVECU 22 is adopted as the true data, and the diagnostic data from the high-voltage converter 12 is ignored because the high-voltage converter 12 is not operating normally and the false diagnostic data is transmitted. That is, the FC ECU 10 determines that the motor is operating normally.

As described above, in the present embodiment, the authenticity of the diagnostic data is determined by determining whether the operating voltage of each device is equal to or higher than the minimum operating voltage and each device is operating normally. It is a thing. Therefore, it is not necessary to have three or more odd inputs as in the majority logic circuit, and it is possible to determine the true / false of any two or more inputs.

In this embodiment, if the diagnostic data from the two devices do not match and the operating voltages of both devices are below the minimum operating voltage, the FCECU 10
Does not judge the diagnosis.

Further, in the present embodiment, the case where two diagnostic signals from the high voltage converter 12 and the HVECU 22 are input has been described, but for example, the battery ECU 1
4 and the HVECU 22 input the diagnosis signal, or the FC cell ECU 18 and the HVECU 22 input the diagnosis signal, the authenticity can be determined in the same manner.

In the present embodiment, the operating voltages of the two devices are compared with the minimum operating voltage only when the contents of the two diagnostic signals do not match, but the contents of the two diagnostic signals match. In this case, each operating voltage may be compared with the minimum operating voltage for confirmation. Also in this case, the FC ECU 10 finally determines that the diagnostic signal from the device whose operating voltage is equal to or higher than the minimum operating voltage is true.

Further, although the present embodiment has been described by taking the in-vehicle device as an example, the present invention is applied to any system in which there is a main control device and there are a plurality of control devices for transmitting a diagnostic signal to the main control device. It is possible to

[0029]

As described above, according to the present invention, it is possible to process a plurality of input signals by judging the authenticity of a plurality of input signals with a simple structure.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of an embodiment.

FIG. 2 is a processing flowchart of an embodiment.

FIG. 3 is a configuration diagram of a logical operation circuit.

[Explanation of symbols]

10 FC ECU, 12 high voltage converter, 14 battery ECU, 16 high voltage battery, 18 FC cell ECU, 20
High pressure stack, 22 HVECU.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G01R 35/00 B60K 6/04 // G01M 17/007 G01M 17/00 HF term (reference) 2G035 AA01 AA26 AB02 AC15 AD27 AD28 2G036 AA27 BA12 BA36 BA37 BA38 5H115 PA08 PC06 PG04 PI11 PI16 PU01 PV09 TR01 TR04 TR05 TR07 TR19 UB05 UB17

Claims (5)

[Claims] 1. A device for processing a plurality of measurement results from a plurality of measurement devices for measuring the same physical quantity of the same object, and means for determining whether or not the plurality of measurement results match each other, When the plurality of measurement results do not match, means for comparing the operating voltage of each of the plurality of measuring devices with its minimum operating voltage, and determining the measurement result of the measuring device having an operating voltage equal to or higher than the minimum operating voltage as true. A signal processing device comprising: 2. The device according to claim 1, further comprising means for calculating an operating voltage of each of the plurality of measuring devices by using a voltage drop between the plurality of devices and a common power source. A signal processing device characterized by: 3. The device according to claim 2, further comprising a unit that stores a voltage drop between the plurality of devices and a common power source for each of the plurality of measurement devices. Processing equipment. 4. The device according to claim 1, wherein the plurality of measuring devices are devices that measure an operating state of an in-vehicle motor and output a normal or abnormal signal. Signal processing device. 5. The device according to claim 1, wherein the plurality of measurement devices are devices that measure a state of a vehicle-mounted battery and output a normal or abnormal signal. Signal processing device.