KR102843287B1 - Vehicle controller with error diagnosis function of sensor signal and method for diagnosing error therof - Google Patents

Abstract

A vehicle controller having a sensor signal error diagnosis function according to a preferred embodiment of the present invention includes a signal detection unit that detects a signal omission of a vehicle sensor, a short-circuit determination unit that determines whether a low-side battery short-circuit of a vehicle load occurs when the signal omission is detected, and a signal diagnosis unit that diagnoses whether an error in the signal omission occurs by using a differential amplification value generated by amplifying the difference between a preset internal voltage and a supply voltage supplied to the vehicle sensor when the low-side battery short-circuit failure is determined.

Description

Vehicle controller with error diagnosis function of sensor signal and method for diagnosing error thereof {VEHICLE CONTROLLER WITH ERROR DIAGNOSIS FUNCTION OF SENSOR SIGNAL AND METHOD FOR DIAGNOSING ERROR THEROF}

The present invention relates to a vehicle controller having an error diagnosis function of a sensor signal, and an error diagnosis method thereof.

In vehicles equipped with internal combustion engines, fuel injection and ignition timing are adjusted based on driving conditions. In particular, multi-cylinder engines require precise synchronization of fuel injection and ignition timing for each cylinder to prevent reduced output or the generation of harmful gases due to incomplete combustion.

In order to perform synchronization of such engines, it is necessary to detect the exact rotational position of the crankshaft for each cylinder. In conventional technology, a crankshaft position sensor (CKP) and a cam position sensor (CMP) are used to detect the exact position of the crankshaft.

Additionally, injectors are utilized as fuel injection nozzles, and solenoid valves are built in to inject fuel in response to injection signals from the controller. Injectors are installed in the manifold of each engine cylinder and connected to fuel supply pipes.

Referring to Fig. 1, the injector (3) may experience a short circuit to battery (SCB) failure when the control unit (10) performs low-side control. At this time, an overcurrent occurs due to the diagnostic current of the control unit (10), and inductive coupling noise (ISN) may be induced in the CKP supply power (CKP 5V supply) through the adjacent wiring harness. This affects the CKP signal quality, leading to an abnormal state in which maintenance of startability cannot be guaranteed. In other words, a situation occurs in which a battery short circuit occurs and the vehicle engine is turned off due to a misdiagnosis in which the CKP signal is dropped after a certain period of time.

Accordingly, when a short circuit occurs in a high-current load such as a high-pressure injector or high-pressure pump, an improvement measure is required for the misdiagnosis in which the CKP signal is omitted due to inductive coupling noise (ISN) induced through the wiring harness.

Republic of Korea Patent No. 10-1806364

Accordingly, the present invention has been devised in consideration of the above circumstances, and the purpose of the present invention is to provide a vehicle controller having an error diagnosis function of a sensor signal that determines whether an error in a CKP signal is due to inductive coupling noise (ISN) by monitoring a differential amplifier circuit that amplifies the difference between an internal voltage and a CKP supply voltage when diagnosing a fault in a low-side SCB with a high-current specification such as an injector, and an error diagnosis method thereof.

A vehicle controller having a sensor signal error diagnosis function according to a preferred embodiment of the present invention for achieving the above object includes: a signal detection unit for detecting a signal omission of a vehicle sensor; a short-circuit determination unit for determining whether a low-side battery short-circuit of a vehicle load occurs when the signal omission is detected; and a signal diagnosis unit for diagnosing whether an error in the signal omission occurs by using a differential amplification value generated by amplifying a difference between a preset internal voltage and a supply voltage supplied to the vehicle sensor when the low-side battery short-circuit failure is determined.

The above vehicle sensor may include a crankshaft position sensor.

The above vehicle load may include an injector.

The signal diagnosis unit may compare the differential amplification value with a preset reference voltage, and if the comparison results do not match, it may be determined that noise has occurred in the supply voltage due to a short circuit in the battery.

The above signal diagnostic unit can, if it determines that the noise has occurred, notify the upper controller that an error has occurred in the signal omission.

A preferred embodiment of the present invention for achieving the above object includes a method for diagnosing an error in a vehicle controller, comprising: a signal detection step for detecting a signal omission from a vehicle sensor; a short-circuit determination step for determining whether a low-side battery short-circuit of a vehicle load occurs when the signal omission is detected; and a signal diagnosis step for diagnosing whether the signal omission is an error by using a differential amplification value generated by amplifying the difference between a preset internal voltage and a supply voltage supplied to the vehicle sensor when the low-side battery short-circuit failure is determined.

The above vehicle sensor may include a crankshaft position sensor.

The above vehicle load may include an injector.

The above signal diagnosis step compares the differential amplification value with a preset reference voltage, and if the comparison results do not match, it can be determined that noise has occurred in the supply voltage due to a short circuit of the battery.

If it is determined that the above noise has occurred, a notification step for notifying the upper controller that an error has occurred in the above signal omission may be further included.

According to a vehicle controller having an error diagnosis function of a sensor signal according to a preferred embodiment of the present invention, and an error diagnosis method thereof, when diagnosing a fault in a low-side SCB of a high-current specification such as an injector, a differential amplifier circuit that amplifies the difference between an internal voltage and a CKP supply voltage is monitored to determine whether an error in the CKP signal is caused by inductive coupling noise (ISN), thereby enabling a preemptive confirmation of the state of the CKP supply voltage, and preventing additional accidents due to an abnormal misdiagnosis of the CKP signal.

FIG. 1 is a block diagram of a vehicle controller having an error diagnosis function of a sensor signal according to a preferred embodiment of the present invention.
Figure 2 is a block diagram showing the configuration of the control unit of Figure 1.
Figure 3 is a diagram showing a differential amplifier circuit.
Fig. 4 is a flowchart of an error diagnosis method of a vehicle controller according to a preferred embodiment of the invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. First, when assigning reference numerals to components in each drawing, it should be noted that, where possible, identical components are assigned the same reference numerals even if they are shown in different drawings. Furthermore, while preferred embodiments of the present invention will be described below, it should be understood that the technical concept of the present invention is not limited or restricted thereto and can be modified and implemented in various ways by those skilled in the art.

Fig. 1 is a block diagram of a vehicle controller having an error diagnosis function for a sensor signal according to a preferred embodiment of the present invention. Fig. 2 is a block diagram showing the configuration of the control unit of Fig. 1.

Referring to FIGS. 1 and 2, a vehicle controller (1) having an error diagnosis function of a sensor signal according to a preferred embodiment of the present invention can drive an injector (3) using a CKP signal (CKP sig.) of a crankshaft position sensor (2). The vehicle controller (1) can have a low-side SCB failure diagnosis function of the injector (3). The vehicle controller (1) is characterized in that, when diagnosing a low-side SCB failure of the injector (3), it determines whether the CKP signal is an error caused by inductive coupling noise (ISN).

The vehicle controller (1) may include a control unit (10), a power IC (20), and a low-side switch (30).

The control unit (10) can drive the injector (3) through low-side control of the low-side switch (30). The control unit (10) can measure the amount of current flowing to the low-side switch (30) through a separate current sensor (not shown) to diagnose whether the low-side battery short-circuit of the injector (3) is faulty. When the control unit (10) diagnoses a battery short-circuit fault, it can notify the upper controller of the corresponding information and determine the subsequent control direction for driving the injector (3).

The control unit (10) may include a signal detection unit (11), a short circuit determination unit (12), and a signal diagnosis unit (13).

The signal detection unit (11) can receive the amount of current flowing to the low-side switch (30) through a separate current sensor. The signal detection unit (11) can receive the internal voltage of the vehicle controller (1) and the output voltage (differential amplification value) of the differential amplifier circuit that differentially amplifies the CKP supply voltage. The signal detection unit (11) can receive the CKP signal from the crankshaft position sensor (2). When the CKP signal is missing, the signal detection unit (11) can notify the short circuit determination unit (12) of the missing CKP signal.

The short circuit judgment unit (12) can determine a low-side battery short circuit failure of the injector (3) using the amount of current received through the current sensor. When the short circuit judgment unit (12) determines a battery short circuit failure, it can notify the signal diagnosis unit (13) and the upper controller of the corresponding situation.

When the signal diagnosis unit (13) confirms a low-side battery short-circuit failure of the injector (3), it can diagnose whether the CKP signal (CKP sig.) of the crankshaft position sensor (2) is missing due to inductive coupling noise (ISN). The signal diagnosis unit (13) can compare the output voltage of the differential amplifier circuit with a preset reference voltage. The reference voltage can represent a voltage in a normal state. The signal diagnosis unit (13) can determine that inductive coupling noise (ISN) has occurred when the output voltage of the differential amplifier circuit does not match the reference voltage. The signal diagnosis unit (13) can notify the upper controller that the missing CKP signal (CKP sig.) is due to inductive coupling noise (ISN).

The power IC (20) can generate a CKP supply voltage to be supplied to the crankshaft position sensor (20).

The low-side switch (30) can be turned on or off by the control unit (10) to perform low-side driving of the injector (3).

Figure 3 is a diagram showing a differential amplifier circuit.

Referring to Fig. 3, a differential amplifier circuit (AMP) can amplify and output the difference between the internal voltage (Internal 5V) of the vehicle controller (1) and the CKP supply voltage (CKP 5V) supplied to the crankshaft position sensor (20). The differential amplifier circuit (AMP) can transmit the output voltage (V ₀ ) to the control unit (10). The control unit (10) can determine whether inductive coupling noise (ISN) occurs using the output voltage (V ₀ ) of the differential amplifier circuit (AMP).

Fig. 4 is a flowchart of an error diagnosis method of a vehicle controller according to a preferred embodiment of the invention.

Referring to FIG. 1 and FIG. 4, a method for diagnosing an error in a vehicle controller according to a preferred embodiment of the present invention is characterized by determining whether an error in a CKP signal is caused by inductive coupling noise (ISN) when diagnosing a low-side SCB failure of an injector (3).

An error diagnosis method of a vehicle controller according to a preferred embodiment of the present invention may include a signal detection step (S410), a short circuit determination step (S420), a signal diagnosis step (S430), and a notification step (S440).

In the signal detection step (S410), the signal detection unit (11) can receive a CKP signal from the crankshaft position sensor (2). When the CKP signal is missing, the signal detection unit (11) can notify the short circuit determination unit (12) of the missing CKP signal.

In the short circuit judgment step (S420), when the short circuit judgment unit (12) detects a missing CKP signal, it can use the amount of current flowing to the low-side switch (30) to determine whether the low-side battery of the injector (2) is short-circuited.

In the signal diagnosis step (S430), the signal diagnosis unit (13) can diagnose whether the CKP signal is missing due to inductive coupling noise (ISN) when confirming a low-side battery short-circuit failure of the injector (3). The signal diagnosis unit (13) can compare the output voltage of the differential amplifier circuit with a preset reference voltage. If the output voltage of the differential amplifier circuit does not match the reference voltage, the signal diagnosis unit (13) can determine that inductive coupling noise (ISN) has occurred.

In the notification step (S440), if the signal diagnosis unit (13) determines that inductive coupling noise (ISN) has occurred, it can notify the upper controller of the omission of the CKP signal (CKP sig.) due to the inductive coupling noise (ISN). In other words, the signal diagnosis unit (13) can notify of a CKP abnormality misdiagnosis due to a battery short-circuit failure. Through this, the status of the CKP supply voltage can be preemptively checked, and there is an effect of preventing additional accidents due to abnormal misdiagnosis of the CKP signal.

The above description is merely an illustrative illustration of the technical idea of the present invention, and those skilled in the art will appreciate that various modifications, changes, and substitutions may be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate, rather than limit, the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings.

The steps and/or operations according to the present invention may occur in different orders, in parallel, or concurrently in different embodiments for different epochs, etc., as would be understood by one of ordinary skill in the art.

In some embodiments, some or all of the steps and/or operations may be implemented or performed at least in part using instructions, programs, interactive data structures, clients and/or servers stored on one or more non-transitory computer-readable media. The one or more non-transitory computer-readable media may be, for example, software, firmware, hardware, and/or any combination thereof. Furthermore, the functionality of a “module” discussed herein may be implemented in software, firmware, hardware, and/or any combination thereof.

1: Vehicle controller
10: Control unit
11: Signal detection unit
12: Paragraph Judgment Section
13: Signal Diagnostic Section
20: Power IC
30: Low-side switch
2: Crankshaft position sensor
3: Injector

Claims (10)

A signal detection unit that detects a loss of an output signal when an output signal of a vehicle sensor sensing the vehicle load is not transmitted when driving a vehicle load through low-side switch control;
A short circuit determination unit that determines whether a low-side battery short circuit of the vehicle load occurs when a loss of the above output signal is detected; and
A signal diagnosis unit that diagnoses whether there is an error in the omission of the output signal by using a differential amplification value generated by amplifying the difference between a preset internal voltage and a supply voltage supplied to the vehicle sensor when determining the low-side battery short-circuit fault;
Including,
The above signal diagnostic unit,
A vehicle controller having an error diagnosis function of a sensor signal, characterized in that the differential amplification value is compared with a preset reference voltage, and if the comparison result does not match, it is determined that noise has occurred in the supply voltage due to a short circuit failure of the battery, and the output signal is diagnosed as being omitted due to the noise of the supply voltage. In the first paragraph,
A vehicle controller having an error diagnosis function of a sensor signal, characterized in that the vehicle sensor includes a crankshaft position sensor. In the first paragraph,
A vehicle controller having an error diagnosis function of a sensor signal, characterized in that the vehicle load includes an injector. delete In the first paragraph,
The above signal diagnostic unit,
A vehicle controller having an error diagnosis function of a sensor signal, characterized in that when it is determined that the above noise has occurred, it notifies an upper controller that an error has occurred in the omission of the output signal. A signal detection step for detecting a loss of an output signal when an output signal of a vehicle sensor sensing the vehicle load is not transmitted when driving a vehicle load through low-side switch control;
A short circuit determination step for determining whether a low-side battery of the vehicle load is short-circuited when a loss of the above output signal is detected; and
A signal diagnosis step for diagnosing whether there is an error in the omission of the output signal by using a differential amplification value generated by amplifying the difference between a preset internal voltage and a supply voltage supplied to the vehicle sensor when determining the low-side battery short-circuit fault;
Including,
The above signal diagnosis step is:
A method for diagnosing an error in a vehicle controller, comprising: comparing the differential amplification value with a preset reference voltage, and, if the comparison result does not match, determining that noise has occurred in the supply voltage due to a short circuit failure of the battery, and diagnosing that the output signal has been omitted due to the noise in the supply voltage. In paragraph 6,
A method for diagnosing an error in a vehicle controller, characterized in that the vehicle sensor includes a crankshaft position sensor. In paragraph 6,
A method for diagnosing an error in a vehicle controller, characterized in that the vehicle load includes an injector. delete In paragraph 6,
A notification step for notifying the upper controller that an error has occurred in the omission of the output signal when it is determined that the above noise has occurred;
A method for diagnosing an error in a vehicle controller, characterized in that it further includes: