CN105388881B - The fault detect display device and method of a kind of entire car controller - Google Patents

Abstract

The embodiment of the present invention discloses a fault detection and display device and method for a vehicle controller, including: the communication module writes the diagnostic mode program to the vehicle controller in the detection scene, and writes the diagnostic mode program to the vehicle controller in the working scene. Write the working mode program, and provide data communication between the vehicle controller and the upper computer controller during the detection process; the upper computer controller determines and issues detection instructions according to the channel between each pin and the microprocessor, According to the detection result signal, the corresponding detection instruction and the corresponding pin, judge the type and location of the fault; the signal processing and acquisition module receives the detection instruction sent by the host computer controller, generates a detection signal, and sends it to the input pin of the vehicle controller , collect the detection result signal from the collection terminal pin of the vehicle controller, and return it to the host computer controller; the display module displays the fault type and location. The invention can improve the accuracy and detection efficiency of fault detection.

Description

Fault detection and display device and method for vehicle controller

technical field

The invention relates to the technical field of automobiles, and more particularly, to a fault detection and display device and method for a vehicle controller.

Background technique

Energy shortages, oil crises and environmental pollution are intensifying, which have a huge impact on people's lives and are directly related to the sustainable development of the country's economy and society. All countries in the world are actively developing new energy technologies. As a new energy vehicle with reduced oil consumption, low pollution, and low noise, electric vehicles are considered to be an important way to solve the energy crisis and environmental degradation. Hybrid vehicles take into account the advantages of pure electric vehicles and traditional internal combustion engine vehicles at the same time. On the premise of meeting the requirements of vehicle power and mileage, it effectively improves fuel economy and reduces emissions. It is considered to be the current energy-saving and emission reduction one of the valid paths.

The vehicle controller (VCU, Vehicle Control Unit) is the assembly controller of the hybrid/pure electric vehicle power system, responsible for coordinating the work of the engine, drive motor, gearbox, power battery and other components, improving the economy, Power, safety and reduce emission pollution.

In the field of VCU fault detection, the existing main technical solutions are: firstly screen through fault codes, and then analyze possible fault causes for troubleshooting.

However, the main defect of this existing technical solution is that for the cause of the specific problem, or the situation that the fault has a phenomenon but does not report to the police, further analysis is mainly carried out through the functional testing platform and hardware-in-the-loop testing, and the obtained The results are relatively rough, and it is not conducive to refine the cause of the problem. It is often impossible to eliminate the interference of hardware factors for software error checking and data error checking. In addition, due to the many cross-factors during the simulated load operation, it is difficult to troubleshoot the problem.

Contents of the invention

The object of the present invention is to provide a fault detection and display device and method for a vehicle controller, thereby improving the accuracy and efficiency of fault detection.

A fault detection and display device for a vehicle controller, the vehicle controller includes a plurality of pins and a microprocessor, the fault detection and display device includes:

The communication module is used to write the diagnosis mode program to the vehicle controller in the detection scene, and write the work mode program to the vehicle controller in the work scene, and is used to provide the vehicle controller during the detection process Data communication with the host computer controller;

The upper computer controller is used to determine and issue a detection instruction according to the channel between each pin and the microprocessor, receive the detection result signal of the communication module or the detection result signal collected by the signal processing acquisition module, and according to the detection result signal and Corresponding detection instructions and corresponding pins, judging the fault type and location in the vehicle controller;

The signal processing and acquisition module is used to receive the detection instruction issued by the upper computer controller, generate a detection signal according to the detection instruction, and send the detection signal to the corresponding input pin of the vehicle controller, and then from the corresponding input pin of the vehicle controller The acquisition terminal pin collects the detection result signal, and returns the detection result signal to the host computer controller;

The display module is used to communicate with the upper computer controller, display the circuit diagram inside the vehicle controller, and display the fault type and location judged by the upper computer controller on the circuit diagram.

In yet another exemplary embodiment of the fault detection and display device, the diagnosis mode program is used to divide and process the circuit components in the vehicle controller according to detection requirements.

In yet another exemplary embodiment of the fault detection and display device, the host computer controller is specifically used for:

When performing input detection, perform handshake communication with the vehicle controller through the communication module, send detection instructions to the signal processing and acquisition module, and receive the detection result signal fed back by the vehicle controller through the communication module ;

When performing output detection, perform handshake communication with the vehicle controller through the communication module, send detection instructions to the vehicle controller through the communication module, and receive the detection results collected and fed back by the signal processing and acquisition module Signal.

In yet another exemplary embodiment of the fault detection and display device, for input detection:

For the detection instruction that uses the analog signal as the detection signal for input detection, the signal processing and acquisition module is specifically used to: use the waveform input covering the working voltage range as the detection signal to send to the corresponding pin; the host computer controller is specifically used to In: by comparing the output curve of the detection result signal with the preset normal output curve, determine the type and location of the fault in the vehicle controller;

For a detection instruction that uses a digital signal as a detection signal for input detection, the signal processing and acquisition module is specifically used for: using a corresponding analog input signal as a detection signal to send to a corresponding pin; the host computer controller is specifically used for: Judging whether the corresponding input path in the vehicle controller is normal by checking whether the detection result signal jumps or not and the timing of the jump;

For a detection instruction that uses a frequency or pulse width modulation signal as a detection signal for input detection, the signal processing and acquisition module is specifically used to: use an input signal that increases from a low frequency to a high frequency as a detection signal and send it to a corresponding pin; The upper computer controller is specifically used for: judging the type and location of the fault in the vehicle controller through the frequency response to the required range of the detection result signal.

In yet another exemplary embodiment of the fault detection and display device, for output detection:

The signal processing acquisition module is specifically used for: for the digital signal output by the acquisition pin, use analog to measure and acquire; for the high-side and low-side current drive signals output by the acquisition pin, use an analog load for voltage acquisition; The width modulation signal is converted by the triode and the current signal output from the acquisition pin is collected by using an analog load.

A fault detection and display method for a vehicle controller, the vehicle controller including a plurality of pins and a microprocessor, the method comprising:

Write the diagnostic mode program to the vehicle controller in the detection scene;

Determine and issue detection instructions according to the channel between each pin and the microprocessor;

For input detection, generate a detection signal according to the detection instruction, send the detection signal to the corresponding input pin of the vehicle controller, and receive the detection result signal fed back by the vehicle controller; The controller sends a detection instruction, and collects the detection result signal from the corresponding acquisition terminal pin of the vehicle controller;

According to the detection result signal, the corresponding detection instruction and the corresponding pin, determine the type and location of the fault in the vehicle controller;

displaying the circuit diagram inside the vehicle controller, and displaying the judged fault type and location on the circuit diagram;

In the working scene, write the working mode program to the vehicle controller.

In yet another exemplary embodiment of the fault detection and display device, the diagnosis mode program is used to divide and process the circuit components in the vehicle controller according to detection requirements.

In yet another exemplary embodiment of the fault detection and display device,

For the detection instruction that uses the analog signal as the detection signal for input detection, it specifically includes: using the waveform input covering the working voltage range as the detection signal to send to the corresponding pin; by comparing the output curve of the detection result signal with the preset normal Compare the output curves to determine the type and location of the fault in the vehicle controller;

For the detection instruction that uses the digital signal as the detection signal for input detection, it specifically includes: using the corresponding analog input signal as the detection signal to send to the corresponding pin; judging whether the corresponding input path in the vehicle controller is normal;

For the detection instruction of using the frequency or pulse width modulation signal as the detection signal for input detection, it specifically includes: using the input signal from low frequency to high frequency as the detection signal and sending it to the corresponding pin; The frequency response of the interval range is required to judge the type and location of the fault in the vehicle controller.

In yet another exemplary embodiment of the fault detection and display device, the method specifically includes: measuring and collecting the digital signal output by the collection pin in an analog manner; For the current drive signal, the analog load is used for voltage acquisition; for the current signal converted by the pulse width modulation signal through the triode and output from the acquisition pin, the analog load is used for acquisition.

In yet another exemplary embodiment of the fault detection and display device, the method specifically includes: performing handshake communication with the vehicle controller before detection; Perform data communication related to detection.

It can be seen from the above technical solutions that in the prior art, due to the limitation of the characteristics of the working program of the controller, only the function can be refined, but the circuit cannot be detailed. Compared with the prior art, the technical solution of the present invention can write the diagnostic mode program to the VCU under the detection scene, changing the working mode of the VCU, and the diagnostic mode program is used to reset the circuit in the vehicle controller. The components are divided into blocks according to the detection requirements, so that targeted detection signals can be given to the VCU, the cooperation between the upper computer and the lower computer can be realized, and the circuit components in the vehicle controller can be separated according to different signal paths. Diagnosis, through comparison with standard signals and built-in diagnostic logic, can realize fault detection of signal paths and even independent components, and more accurately locate the cause of faults. After the detection is completed, the VCU working mode program is injected again to restore the working mode of the VCU. The invention can eliminate hardware problems through external detection, reduce the interference of hardware problems on overall troubleshooting, and save the workload of hardware engineers, thereby improving the accuracy and efficiency of fault detection.

Description of drawings

The following drawings only illustrate and explain the present invention schematically, and do not limit the scope of the present invention.

Fig. 1 is a kind of composition diagram of the fault detection display device of vehicle controller of the present invention;

Fig. 2 is a schematic diagram of an input curve of a detection signal according to the present invention;

Fig. 3 is a prototype diagram of a circuit assembly in a vehicle controller;

FIG. 4 is a prototype diagram of a circuit component driven by a driving signal in a vehicle controller;

Fig. 5 is a schematic flow chart of the fault detection and display method of the vehicle controller according to the present invention.

detailed description

In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.

For the sake of brevity and intuition in description, the solution of the present invention is described below by describing several representative implementation manners. Numerous details in the embodiments are only used to help the understanding of the solutions of the present invention. But obviously, the technical solutions of the present invention may not be limited to these details when implemented. In order to avoid unnecessarily obscuring the solution of the present invention, some embodiments are not described in detail, but only a framework is given. Hereinafter, "including" means "including but not limited to", and "according to..." means "at least according to, but not limited to only based on...". Due to the language habits of Chinese, when the quantity of a component is not specifically indicated below, it means that the component can be one or more, or can be understood as at least one.

In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.

In order to make the drawings concise, the figures in each figure only schematically show the relevant parts of the present invention, and do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked.

Herein, "one" does not mean limiting the number of relevant parts of the present invention to "only one", and "one" does not mean excluding the case that the number of relevant parts of the present invention is "more than one".

FIG. 1 is a schematic composition diagram of a fault detection and display device of a vehicle controller (VCU) according to the present invention. The whole vehicle controller of the present invention is a device under test, and the whole vehicle controller includes a plurality of pins and a microprocessor. Referring to Fig. 1, the fault detection and display device of the vehicle controller according to the present invention mainly includes:

The communication module 101 is used to flash and write the diagnosis mode program to the vehicle controller 104 in the detection scene, and write the work mode program to the vehicle controller 104 in the work scene, and is used to provide the whole vehicle controller 104 during the detection process. Data communication between the car controller 104 and the host computer controller 102. More specifically, the communication module 101 is also specifically used to undertake the synchronization of the detection steps during the detection process, and upload the detection results of some signals to the upper computer controller 102 for detection and judgment. The diagnostic mode program is used to process the circuit components in the vehicle controller 104 in blocks according to detection requirements.

The upper computer controller 102 is used to determine and issue a detection instruction according to the channel between each pin and the microprocessor, receive the detection result signal of the communication module 101 or the detection result signal collected by the signal processing and acquisition module 103, and according to the detection The resulting signal, the corresponding detection instruction and the corresponding pin determine the type and location of the fault in the vehicle controller 104 . Compared with the upper computer controller 102, the vehicle controller 104 is a lower computer.

The signal processing acquisition module 103 is used to receive the detection instruction sent by the upper computer controller 102, generate a detection signal according to the detection instruction, send the detection signal to the corresponding input pin of the vehicle controller 104, and receive the signal from the vehicle controller 104. The corresponding collection terminal pin of the controller 104 collects the detection result signal, and returns the detection result signal to the upper computer controller 102 .

The display module 105 is used to communicate with the upper computer controller 102, display the circuit diagram inside the vehicle controller 104, and display the fault type and position judged by the upper computer controller 102 on the circuit diagram superior.

Described communication module 101 is the interface of the communication of described upper computer controller 102 and vehicle controller 104, concrete communication mode can be to adopt K line communication or CAN line communication, realize the function of Bootloader, and from vehicle controller 104 The parameters read from the communication data stream are sent to the upper computer controller 102. Described Bootloader is the first piece of code that embedded system executes after power-on, after it completes the initialization of central processing unit (CPU) and relevant hardware, then the embedded application program of operating system image or solidification is installed in memory Then jump to the space where the operating system is located, and start the operating system to run.

In the present invention, through the Bootloader function of the communication module 101, a pre-edited application program can be written into the vehicle controller 104, which is a diagnostic mode program or a working mode program here. The communication module 101 is specifically controlled by the host computer controller 102 , and the pre-edited program can be input to the communication module 101 by the host computer controller 102 .

In the present invention, the working mode program is an existing working mode program, that is to say, in a normal working scene, there is an existing working mode program in the vehicle controller 104, and this existing working mode program The mode program can control the circuit components in the vehicle controller 104, so that the signal flows to the working logic, that is to say, each circuit component has a logical relationship. The diagnostic mode program makes the vehicle controller 104 enter a diagnostic mode, that is to say, the present invention can compile a diagnostic mode program by a programmer according to the input and output functions of the vehicle controller 104 and according to the diagnostic detection requirements, This diagnostic mode program is mainly used to divide the circuit in the vehicle controller 104 into individual circuit components, isolation can be realized between each circuit component, and there is no mutual relationship between signal flow directions, which is convenient for the present invention. The above-mentioned fault detection and display device detects individual components, so as to realize the fault detection of signal paths and even independent components, so as to more accurately locate the type and location of the fault. As for the specific compilation method of the diagnostic mode program, programmers in the field can compile it by themselves according to the implementation requirements of the present invention and the detection requirements of the specific environment, and the technical solution of the present invention does not limit this specific compilation method.

The upper computer controller 102 stores the working mode program and the diagnosis mode program by itself or through a designated memory. In the diagnosis scenario of the present invention, the upper computer controller 102 writes a diagnosis mode program to the vehicle controller 104 through the communication module 101, and the diagnosis mode program can instruct the microprocessor in the vehicle controller 104 to The circuit components in the vehicle controller 104 are divided into blocks according to the detection requirements, so that a certain independent circuit component or element can be individually detected according to the specific detection requirements to accurately locate the fault.

Specifically, the fault detection can be divided into the detection of the input signal of the vehicle controller (referred to as input detection for short) and the detection of the output signal (referred to as output detection for short), and for the input detection and output detection, there are different detection methods.

When performing input detection, the host computer controller 102 is specifically used to: carry out handshake communication with the vehicle controller 104 through the communication module 101, and send a detection instruction to the signal processing and acquisition module 103; the signal The processing and acquisition module 103 receives the detection instruction sent by the upper computer controller 102 , generates a detection signal according to the detection instruction, and sends the detection signal to the corresponding input pin of the vehicle controller 104 . The purpose of the handshake communication is to inform the vehicle controller 104 that the input detection starts, and the host computer controller 102 communicates with the vehicle controller 104 through the communication module 101 to keep the steps in the detection process synchronous. The controller 102 informs the vehicle controller 104 through the communication module 101 of the type of the detection result signal that needs to be returned, and the vehicle controller 104 executes the detection logic after receiving the detection signal of the input terminal pin, through The communication module 101 feeds back the corresponding detection result signal to the host computer controller 102, and after the host computer controller 102 receives the detection result signal fed back by the vehicle controller 104 through the communication module 101, according to the detection result signal and corresponding detection instructions and corresponding pins to determine the type and location of the fault in the vehicle controller 104 .

When performing output detection, the host computer controller 102 is specifically used to: perform handshake communication with the vehicle controller 104 through the communication module 101, and send detection instructions to the vehicle controller 104 through the communication module 101 . The purpose of the handshake communication is to inform the vehicle controller 104 that the output detection starts, and the host computer controller 102 communicates with the vehicle controller 104 through the communication module 101 to keep the steps in the detection process synchronous. The vehicle controller 102 informs the vehicle controller 104 of the detection logic to be executed in the detection instruction sent to the vehicle controller 104 through the communication module 101, and the upper controller 102 also notifies the signal processing and acquisition module 103 to perform the corresponding acquisition. The terminal pin collects the detection result signal, and feeds back the collected detection result signal to the upper computer controller 102, and the upper computer controller 102 judges the vehicle controller according to the detection result signal, the corresponding detection instruction and the corresponding pin. Type and location of failure in 104.

The circuit diagram of the vehicle controller can be pre-stored in the host computer controller 102 or related memory, and the host computer controller 102 outputs the circuit diagram of the vehicle controller 104 to the display module 105 for display. When the upper computer controller 102 judges the specific fault type and location of the vehicle controller 104, the fault type information and location information are output to the display module 105, and the display module 105 is in the vehicle The corresponding position on the circuit diagram of the controller shows the alarm of the fault type.

After the detection is over, the upper computer controller 102 uses the communication module 101 to write the work mode program in the vehicle controller 104, so that the work mode of the vehicle controller 104 can be restored, so that Continue to work normally in the work scene.

The whole vehicle controller 104 of the present invention includes a plurality of pins and a microprocessor. The channel determines the circuit components that need to be tested, and sends out testing instructions.

The signal processing and acquisition module 103 is a signal medium between the upper computer controller 102 and the vehicle controller 104 .

When performing input detection, the host controller decides which input pin to send which signal according to actual detection requirements, and notifies the signal processing and acquisition module 103 by means of a detection instruction. The detection instruction may include: the pin number of the input pin corresponding to the detection signal, the signal type and value of the detection signal, and the like. The signal processing and acquisition module 103 generates a detection signal of a corresponding type and value according to the detection instruction sent by the upper computer controller 102 and according to the type and value of the detection signal informed in the detection instruction, and sends the detection signal to on the corresponding input pins of the vehicle controller 104 .

When performing output detection, the host computer controller 102 will not only notify the vehicle controller 104 of the detection logic to be executed through the communication module 101, but also notify the signal processing and acquisition module 103 of the corresponding pin number of the acquisition terminal pin ( That is, the pin that needs to collect the detection result signal). The signal processing and acquisition module 103 can acquire the detection result signal at the corresponding acquisition terminal pin.

Because in the detection scene, what the vehicle controller 104 runs is a diagnostic mode program, and the diagnostic mode program divides the circuit components of the vehicle controller 104 and performs block processing, so the detection signal can only be generated inside the circuit component. will not affect other isolated circuit components, so as long as the signal processing and acquisition module 103 or the vehicle controller 104 feeds back the detection result signal to the host computer controller 102, the host computer controller 102 will The fault type and location can be judged according to the characteristics of the detection signal and the detection result signal.

The solution of the present invention will be further described below by taking further specific input detection and output detection as examples, combined with more specific examples of circuit components.

One: For input detection:

In the present invention, for the detection instruction issued by the upper computer controller 102 that uses an analog signal as a detection signal for input detection, the signal processing and acquisition module 103 is specifically used to: use waveform input covering the working voltage range as a detection signal to send For the corresponding pin, the waveform input covering the working voltage range can be, for example, a triangle wave or a sawtooth wave, and the input pin of the vehicle controller 104 can read the detection signal, and the detection result of the signal value can be obtained by the communication function The signal is sent to the host computer. For this detection signal, the host computer controller 102 is specifically used to: judge the fault type and position, for example, it can be determined whether there is a numerical abnormality, a short circuit, or an open circuit in the circuit component.

For example, FIG. 2 is a schematic diagram of an input curve of a detection signal according to the present invention; FIG. 3 is a prototype diagram of a circuit component in a vehicle controller. Referring to Figure 2 and Figure 3, the input signal described in Figure 2 is input to the IN pin as a detection signal, and the corresponding acquisition pin is 201, if the voltage collected by the acquisition pin 201 is 5v, it can be judged that the voltage in Figure 3 is The resistor R1 is short-circuited, and if the voltage of the collecting pin 201 is 0v, it is determined that the resistor R2 is open-circuited. If the voltage collected by the collection pin 201 is consistent with that shown in FIG. 2 , it means that the circuit component is normal. For the display module 105, the circuit components shown in FIG. 3 can be displayed first, for example, when it is judged that the resistor R1 is short-circuited, the fault information is displayed at R1.

In yet another specific embodiment, for a detection command using a digital signal as a detection signal for input detection, the signal processing and acquisition module 103 is specifically configured to: use a corresponding analog input signal as a detection signal to send to a corresponding pin; After the vehicle controller 104 reads the detection signal, the detection result signal of the detection signal is fed back to the upper computer controller 102 through the communication module 101; the upper computer controller 102 is specifically used to: Whether the detection result signal jumps or not and the timing of the jump determines whether the corresponding input path in the vehicle controller 104 is normal.

In yet another specific embodiment, for a detection instruction that uses a frequency or a pulse width modulation signal (PWM) as a detection signal for input detection, taking into account the requirements for checking hardware characteristics, the signal processing and acquisition module 103 is specifically configured to: adopt The input signal from low frequency to high frequency is sent to the corresponding pin as a detection signal; after the vehicle controller 104 reads the detection signal, the detection result signal of the detection signal is fed back to the said detection signal through the communication module 101 The upper computer controller 102; the upper computer controller 102 is specifically used for: judging the type and location of the fault in the vehicle controller 104 through the frequency response to the required range of the detection result signal.

Two: For output detection:

In a specific embodiment, the signal processing and acquisition module 103 is specifically configured to: measure and acquire the digital signal output by the acquisition pin in an analog manner to obtain a detection result signal; correspondingly, the host computer controller 102 By comparing the collected detection result signal with the normal signal, the specific fault point can be judged.

In yet another specific embodiment, the signal processing and acquisition module 103 is specifically used to: for the high-side and low-side current drive signals output by the acquisition pins, use an analog load to perform voltage acquisition, and measure and calculate the actual drive circuit parameters. nothing unusual.

FIG. 4 is a prototype diagram of a circuit component driven by a driving signal in a vehicle controller. See Figure 4. When the Control pin has a current drive signal as the detection signal input, but the positive and negative voltages of the sampling pin Sample are Vbatt, it is determined that R2 is abnormal or Q1 is abnormal; when the Control pin has no signal input, the sampling pin If the positive and negative voltages of the Sample terminal are about 1/2 of Vbatt, then Q1 is already abnormal.

In yet another specific embodiment, the signal processing and acquisition module 103 is specifically configured to: use an analog load to collect current signals converted from pulse width modulation signals through triodes and output from the collection pins. The host computer controller 102 compares and analyzes the output characteristics of the detection result signals on the corresponding acquisition pins so as to locate the fault point.

The invention can analyze the specific circuit with the problem by collecting and outputting the signal of the relevant circuit, and locate the possible cause on the hardware. According to the technical scheme of the invention, most of the faults of the input and output systems can be located to specific lines, and some circuits can be located to components, thereby providing convenience for fault analysis.

Fig. 5 is a schematic flow chart of the fault detection and display method of the vehicle controller according to the present invention. The detection method can be executed by the fault detection and display device of the above vehicle controller. Referring to Figure 5, the method specifically includes:

501. Write the diagnosis mode program to the vehicle controller in the detection scene;

502. Determine and issue a detection instruction according to the channel between each pin and the microprocessor;

503. For input detection, generate a detection signal according to the detection instruction, send the detection signal to the corresponding input pin of the vehicle controller, and receive the detection result signal fed back by the vehicle controller; The vehicle controller sends a detection instruction, and collects the detection result signal from the corresponding acquisition terminal pin of the vehicle controller;

504. According to the detection result signal, the corresponding detection instruction and the corresponding pin, determine the type and location of the fault in the vehicle controller;

505. Display the circuit diagram inside the vehicle controller, and display the judged fault type and location on the circuit diagram;

506. Flash and write the working mode program to the vehicle controller in the working scene.

Specifically, the method further specifically includes: performing handshake communication with the vehicle controller before performing the detection; performing data communication related to the detection with the vehicle controller during the detection.

In a preferred embodiment, the present invention can compile a diagnostic mode program by a programmer according to the input and output functions of the vehicle controller, and according to the diagnostic detection requirements, and the diagnostic mode program is mainly used to control the vehicle controller The circuit in the circuit is divided into independent circuit components, and the isolation between each circuit component can be realized, and there is no mutual relationship of signal flow direction, which makes it convenient for the fault detection and display device of the present invention to detect individual components, thereby realizing signal Fault detection of pathways and even individual components to more precisely pinpoint the type and location of faults. As for the specific compilation method of the diagnostic mode program, programmers in the field can compile it by themselves according to the implementation requirements of the present invention and the detection requirements of the specific environment, and the technical solution of the present invention does not limit this specific compilation method.

The vehicle controller of the present invention includes a plurality of pins and a microprocessor. In a specific embodiment of the present invention, the upper controller can Determine the circuit components that need to be detected, and send a detection command to the vehicle controller through the communication module, or send a detection command to the corresponding pin of the vehicle controller through the signal processing and acquisition module, and receive the detection command from the vehicle controller through the communication module Feedback the detection result signal, or collect the detection result signal from the corresponding output pin, by comparing the output curve of the detection result signal with the preset normal output curve, determine the fault type and Location.

The solution of the present invention will be further described below by taking further specific input detection and output detection as examples, combined with more specific examples of circuit components.

(1) For input detection:

In a specific embodiment, for a detection command that uses an analog signal as a detection signal for input detection, the method of the present invention specifically includes: using a waveform input covering a working voltage range as a detection signal and sending it to a corresponding pin; After the vehicle controller 104 reads the detection signal, it feeds back the detection result signal of the detection signal through the communication module; the method of the present invention passes the output curve of the detection result signal and the preset normal output The curves are compared to determine the type and location of the fault in the vehicle controller.

For example, referring to Figure 2 and Figure 3, the input signal described in Figure 2 is input to the IN pin as a detection signal, and the corresponding acquisition pin is 201, if the voltage collected by the acquisition pin 201 is 5v, it can be judged As shown in FIG. 3 , the resistor R1 is short-circuited. If the voltage of the acquisition pin 201 is 0v, it is determined that the resistor R2 has been opened. If the voltage collected by the collection pin 201 is consistent with that shown in FIG. 2 , it means that the circuit component is normal.

In a specific embodiment, for a detection command using a digital signal as a detection signal for input detection, the method of the present invention specifically includes: using a corresponding analog input signal as a detection signal to send to a corresponding pin; After the vehicle controller 104 reads the detection signal, the detection result signal of the detection signal is fed back through the communication module; Whether the corresponding input path in the vehicle controller is normal;

In a specific embodiment, for the detection command that uses a frequency or pulse width modulation signal as a detection signal for input detection, the method of the present invention specifically includes: using an input signal that increases from a low frequency to a high frequency as a detection signal to send to the corresponding pin; after the vehicle controller 104 reads the detection signal, the detection result signal of the detection signal is fed back through the communication module; the method of the present invention passes the required detection result signal The frequency response of the interval range is used to judge the type and location of the fault in the vehicle controller.

(2) For output detection:

First send a detection command to the vehicle controller, the detection command is used to inform the vehicle controller which device sends out which signal, and then collect the output signal at the corresponding collection terminal pin. For the output signal of the pin at the acquisition terminal, the method specifically includes: for the digital signal output by the acquisition pin, adopting an analog method to measure and acquire; for the high-side and low-side current drive signals output by the acquisition pin, using an analog load to For voltage acquisition, see Figure 4 for example. When the Control pin has a current drive signal as the detection signal input, but the positive and negative voltages of the sampling pin Sample end are Vbatt, it is determined that R2 is abnormal or Q1 is abnormal; when the Control pin has no signal input, Then the positive and negative voltages of the sampling pin Sample end are about 1/2 of Vbatt, and Q1 is already abnormal; the pulse width modulation signal output by the sampling pin is converted by the triode and the current signal output from the sampling pin is carried out by using an analog load. collection.

The series of detailed descriptions listed above are only specific descriptions of the feasible implementation modes of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent implementation or Changes, such as combination, division or repetition of features, should be included in the protection scope of the present invention.

Claims (10)

1. A fault detection display device of a vehicle controller, said vehicle controller comprising a plurality of pins and a microprocessor, characterized in that the fault detection display device comprises: The communication module is used to write the diagnosis mode program to the vehicle controller in the detection scene, and write the work mode program to the vehicle controller in the work scene, and is used to provide the vehicle controller during the detection process Data communication with the host computer controller; The upper computer controller is used to determine and issue a detection instruction according to the channel between each pin and the microprocessor, receive the detection result signal of the communication module or the detection result signal collected by the signal processing acquisition module, and according to the detection result signal and Corresponding detection instructions and corresponding pins, judging the fault type and location in the vehicle controller; The signal processing and acquisition module is used to receive the detection instruction issued by the upper computer controller, generate a detection signal according to the detection instruction, and send the detection signal to the corresponding input pin of the vehicle controller, and then from the corresponding input pin of the vehicle controller The acquisition terminal pin collects the detection result signal, and returns the detection result signal to the host computer controller; The display module is used to communicate with the upper computer controller, display the circuit diagram inside the vehicle controller, and display the fault type and location judged by the upper computer controller on the circuit diagram. 2 . The fault detection and display device of the vehicle controller according to claim 1 , wherein the diagnostic mode program is used to divide the circuit components in the vehicle controller into blocks according to detection requirements. 3 . 3. The fault detection and display device of the vehicle controller according to claim 1, wherein the host computer controller is specifically used for: When performing input detection, perform handshake communication with the vehicle controller through the communication module, send detection instructions to the signal processing and acquisition module, and receive the detection result signal fed back by the vehicle controller through the communication module ; When performing output detection, perform handshake communication with the vehicle controller through the communication module, send detection instructions to the vehicle controller through the communication module, and receive the detection results collected and fed back by the signal processing and acquisition module Signal. 4. The fault detection and display device of the vehicle controller according to claim 3, characterized in that, for input detection: For the detection instruction that uses the analog signal as the detection signal for input detection, the signal processing and acquisition module is specifically used to: use the waveform input covering the working voltage range as the detection signal to send to the corresponding pin; the host computer controller is specifically used to In: by comparing the output curve of the detection result signal with the preset normal output curve, determine the type and location of the fault in the vehicle controller; For a detection instruction that uses a digital signal as a detection signal for input detection, the signal processing and acquisition module is specifically used for: using a corresponding analog input signal as a detection signal to send to a corresponding pin; the host computer controller is specifically used for: Judging whether the corresponding input path in the vehicle controller is normal by checking whether the detection result signal jumps or not and the timing of the jump; For a detection instruction that uses a frequency or pulse width modulation signal as a detection signal for input detection, the signal processing and acquisition module is specifically used to: use an input signal that increases from a low frequency to a high frequency as a detection signal and send it to a corresponding pin; The upper computer controller is specifically used for: judging the type and location of the fault in the vehicle controller through the frequency response to the required range of the detection result signal. 5. The fault detection and display device of the vehicle controller according to claim 3, characterized in that, for output detection: The signal processing acquisition module is specifically used for: for the digital signal output by the acquisition pin, use analog to measure and acquire; for the high-side and low-side current drive signals output by the acquisition pin, use an analog load for voltage acquisition; The width modulation signal is converted by the triode and the current signal output from the acquisition pin is collected by using an analog load. 6. A fault detection and display method for a vehicle controller, said vehicle controller comprising a plurality of pins and a microprocessor, characterized in that the method comprises: Write the diagnostic mode program to the vehicle controller in the detection scene; Determine and issue detection instructions according to the channel between each pin and the microprocessor; For input detection, generate a detection signal according to the detection instruction, send the detection signal to the corresponding input pin of the vehicle controller, and receive the detection result signal fed back by the vehicle controller; for output detection, send the detection signal to the vehicle controller The controller sends a detection instruction, and collects the detection result signal from the corresponding acquisition terminal pin of the vehicle controller; According to the detection result signal, the corresponding detection instruction and the corresponding pin, determine the type and location of the fault in the vehicle controller; displaying the circuit diagram inside the vehicle controller, and displaying the judged fault type and location on the circuit diagram; In the working scene, write the working mode program to the vehicle controller. 7 . The fault detection and display method of the vehicle controller according to claim 6 , wherein the diagnosis mode program is used to divide the circuit components in the vehicle controller into blocks according to detection requirements. 8 . 8. The fault detection and display method of the vehicle controller according to claim 6, characterized in that: For the detection instruction that uses the analog signal as the detection signal for input detection, it specifically includes: using the waveform input covering the working voltage range as the detection signal to send to the corresponding pin; by comparing the output curve of the detection result signal with the preset normal Compare the output curves to determine the type and location of the fault in the vehicle controller; For the detection instruction that uses the digital signal as the detection signal for input detection, it specifically includes: using the corresponding analog input signal as the detection signal to send to the corresponding pin; by checking whether the detection result signal jumps or not and the jump timing, judging whether the corresponding input path in the vehicle controller is normal; For the detection instruction of using the frequency or pulse width modulation signal as the detection signal for input detection, it specifically includes: using the input signal from low frequency to high frequency as the detection signal and sending it to the corresponding pin; The frequency response of the interval range is required to judge the type and location of the fault in the vehicle controller. 9. The fault detection and display method of the vehicle controller according to claim 6, characterized in that, the method specifically comprises: for the digital signal output by the collection pin, measuring and collecting in an analog manner; for the digital signal output by the collection pin The high-side and low-side current drive signals are collected with an analog load; for the pulse width modulation signal converted by a triode and output from the acquisition pin, an analog load is used for collection. 10. The fault detection and display method of the vehicle controller according to claim 6, characterized in that the method specifically comprises: performing handshake communication with the vehicle controller before detection; The vehicle controller performs data communication related to detection.