Automobile fault reproduction and diagnosis equipment and method based on wiring harness electric signals

Abstract

The invention discloses an automobile fault reproduction and diagnosis device and method based on a wire harness electric signal, and the method comprises the steps: measuring a wire harness signal transmitted by a vehicle part which may have a wire harness signal fault, and obtaining a measurement value of the wire harness signal; and comparing the measured value of the wire harness signal with a standard wire harness signal value when the wire harness signal does not have a fault, and when the measured value of the wire harness signal is not within a range specified by the standard wire harness signal value when the wire harness does not have the fault, determining that the wire harness signal is a fault wire harness signal. When a signal measurement value of the wire harness is within a range specified by a standard wire harness signal value when the wire harness does not have a fault, a fault simulation instruction corresponding to a fault wire harness signal is transmitted to a corresponding wire harness signal receiving part; and if the wire harness signal receiving part reproduces the fault of the automobile part corresponding to the fault wire harness signal, determining that the automobile part possibly having the wire harness signal fault is a fault part.

Description

Technical Field

[0001] The present invention relates to the technical field of wiring harness signal measurement, and in particular to an automobile fault reproduction and diagnosis device and method based on wiring harness electrical signals. Background Art

[0002] When a car breaks down, some of the issues that cause it are relatively subtle, difficult to reproduce, and challenging to analyze, making it difficult for both users and car manufacturers to resolve and improve the problem. Existing methods typically involve simply measuring the relevant wiring harness circuits with a multimeter on the faulty car, or installing a CAN message recorder to record messages over a long period of time if a network issue is initially identified. However, these methods have the following limitations: Existing technologies cannot actively trigger a large number of fault scenarios, and poor wiring harness contact is often the suspected cause of vehicle failures. Current technologies and methods cannot monitor and record wiring harness electrical signals for a long time. As mentioned above, everything may be normal when measured with a multimeter, but the voltage and current signals of occasional failures caused by bumps and vibrations in the vehicle cannot be monitored and recorded. After the wiring harness loop involving network signals is mounted with a CAN message recording device, it can only record message data and cannot analyze messages. Therefore, when using traditional CAN recording tools, because software problems are generally more hidden and difficult to reproduce, it is often fruitless to conclude that there is no problem with the software, and the suspicion is directed to hardware such as the wiring harness. Summary of the Invention

[0003] The purpose of the present invention is to provide, on the one hand, an automobile fault reproduction and diagnosis device based on wiring harness electrical signals, and on the other hand, to provide an automobile fault reproduction and diagnosis method based on wiring harness electrical signals. The system and method can monitor, record and compare the wiring harness voltage, current and resistance status, CAN network signals and video signals for a long time with the diagnosis of design specifications. It can not only comprehensively analyze and measure the problems related to the wiring harness, but also, in addition to traditional passive recording, it can actively simulate the actual vehicle electrical logic to trigger a suspected failure scenario multiple times, saving manpower and time, and reducing the difficulty of reproduction.

[0004] To achieve this purpose, the present invention provides a vehicle fault reproduction and diagnosis device based on wiring harness signals, which includes: The signal measurement module is used to measure the wiring harness signal emitted by a vehicle component that may have a wiring harness signal fault, and obtain a measurement value of the wiring harness signal; The data processing module is used to compare the measured value of the wiring harness signal with a standard wiring harness signal value when the wiring harness signal is normal. When the measured value of the wiring harness signal is not within a specified range of the standard wiring harness signal value when the wiring harness is normal, the wiring harness signal is determined to be a faulty wiring harness signal, and the vehicle component that may have a wiring harness signal fault is determined to be a faulty component. The fault reproduction module is used to transmit the fault simulation instruction corresponding to the faulty wiring harness signal to the corresponding wiring harness signal receiving component when the signal measurement value of the wiring harness is within the range specified by the standard wiring harness signal value when the wiring harness is not faulty. If the wiring harness signal receiving component reproduces the automobile component fault corresponding to the faulty wiring harness signal, it is determined that the vehicle component that may have the wiring harness signal fault is the faulty component.

[0005] Furthermore, the vehicle component that may have a wiring harness signal failure is the vehicle display screen, the wiring harness signal receiving component is the vehicle window, and the wiring harness signal emitted by the vehicle display screen is a video signal. The impedance value and S parameter value of the video signal are obtained by measurement, and the impedance value and S parameter value of the video signal are compared with the range specified by the standard impedance value and the range specified by the standard S parameter value when the video signal is fault-free. When the impedance value of the video signal is not within the range specified by the standard impedance value when the video signal is fault-free, or the S parameter value of the video signal is not within the range specified by the standard S parameter value when the video signal is fault-free, it is determined that the video signal is a faulty wiring harness signal and the vehicle display screen is a faulty component; when the impedance value of the video signal is within the range specified by the standard impedance value when the video signal is fault-free, and the S parameter value of the video signal is within the range specified by the standard S parameter value when the video signal is fault-free, the fault simulation instruction corresponding to the faulty video signal is transmitted to the vehicle window. If the vehicle window reproduces the fault of abnormal window lifting and lowering, it is determined that the vehicle component with the wiring harness signal failure is the vehicle display screen.

[0006] Furthermore, the vehicle component that may have a wiring harness signal failure is the MP5 host, the wiring harness signal receiving component is the vehicle window, and the wiring harness signal emitted by the MP5 host is a CAN message signal. The measured time domain level sequence of the CAN message signal is compared with the range specified by the standard time domain level sequence when the CAN message signal is fault-free. The range specified by the standard time domain level sequence when the CAN message signal is fault-free is the standard time domain level sequence of the CAN message signal itself. When the measured time domain level sequence of the CAN message signal is inconsistent with the range specified by the standard time domain level sequence when the CAN message signal is fault-free, it is determined that the CAN message signal is a fault signal and the MP5 host is a faulty component; when the measured time domain level sequence of the CAN message signal is consistent with the range specified by the standard time domain level sequence when the CAN message signal is fault-free, the fault simulation instruction corresponding to the faulty CAN message signal is transmitted to the vehicle window. When the vehicle window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the MP5 host.

[0007] Furthermore, the vehicle component that may have a wiring harness signal failure is the body domain controller, the wiring harness signal receiving component is the window, and the wiring harness signal emitted by the body domain controller is a first voltage signal. The measured voltage value of the first voltage signal is compared with the specified range of the standard voltage value when the first voltage signal is fault-free. When the measured voltage value of the first voltage signal is not within the specified range of the standard voltage value when the first voltage signal is fault-free, it is determined that the first voltage signal is a fault signal and the body domain controller is a faulty component; when the measured voltage value of the first voltage signal is within the specified range of the standard voltage value when the first voltage signal is fault-free, the fault simulation instruction corresponding to the first voltage signal is transmitted to the window. When the window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the body domain controller.

[0008] Furthermore, the vehicle component that may have a wiring harness signal failure is the sunlight and rain sensor, the wiring harness signal receiving component is the vehicle window, and the wiring harness signal emitted by the sunlight and rain sensor is a LIN message signal. The measured time domain level sequence of the LIN message signal is compared with the range specified by the standard time domain level sequence when the LIN message signal is fault-free. The range specified by the standard time domain level sequence when the LIN message signal is fault-free is the standard time domain level sequence of the LIN message signal itself. When the measured time domain level sequence of the LIN message signal is inconsistent with the range specified by the standard time domain level sequence when the LIN message signal is fault-free, it is determined that the LIN message signal is a fault signal and the sunlight and rain sensor is a faulty component; when the measured time domain level sequence of the LIN message signal is consistent with the range specified by the standard time domain level sequence when the LIN message signal is fault-free, the fault simulation instruction corresponding to the faulty LIN message signal is transmitted to the vehicle window. When the vehicle window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the sunlight and rain sensor.

[0009] Furthermore, the vehicle component that may have a wiring harness signal failure is the instrument and door wiring harness INLINE interface, the wiring harness signal receiving component is the vehicle window, and the signal emitted by the instrument and door wiring harness INLINE interface is a second voltage signal. The measured voltage value of the second voltage signal is compared with the specified range of the standard voltage value when the second voltage signal is fault-free. When the measured voltage value of the second voltage signal is not within the specified range of the standard voltage value when the second voltage signal is fault-free, it is determined that the second voltage signal is a fault signal, and the instrument and door wiring harness INLINE interface is a faulty component; when the measured voltage value of the second voltage signal is within the specified range of the standard voltage value when the second voltage signal is fault-free, the fault simulation instruction corresponding to the second voltage signal fault signal is transmitted to the vehicle window. When the vehicle window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the instrument and door wiring harness INLINE interface.

[0010] Furthermore, the vehicle component that may have a wiring harness signal failure is the window control switch, the wiring harness signal receiving component is the window, and the signal emitted by the window control switch is a digital level signal. The measured digital level value is compared with the range specified by the standard digital level value when the digital level signal is fault-free. When the measured digital level value is not within the range specified by the standard digital level value when the digital level signal is fault-free, it is determined that the digital level signal is a fault signal and the window control switch is a faulty component; when the measured digital level value is within the range specified by the standard digital level value when the digital level signal is fault-free, the fault simulation instruction corresponding to the faulty digital level signal is transmitted to the window. When the window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the window control switch.

[0011] Furthermore, a method for measuring a wiring harness signal emitted by a vehicle component that may have a wiring harness signal fault and obtaining a measurement value of the wiring harness signal includes: selecting a corresponding signal measurement harness according to the type of the wiring harness signal to be measured, directly measuring the signal wiring harness to be measured through the signal measurement harness, and obtaining a measurement value of the wiring harness signal to be measured.

[0012] Furthermore, the automobile fault reproduction and diagnosis device based on wiring harness electrical signals includes an automobile fault reproduction and diagnosis method based on wiring harness electrical signals, which includes: measuring a wiring harness signal emitted by a vehicle component that may have a wiring harness signal fault, and obtaining a measurement value of the wiring harness signal; comparing the measured value of the wiring harness signal with a standard wiring harness signal value when the wiring harness signal is normal; and determining that the wiring harness signal is a faulty wiring harness signal and that a vehicle component that may have a wiring harness signal fault is a faulty component when the measured value of the wiring harness signal is not within a specified range of the standard wiring harness signal value when the wiring harness signal is normal; When the signal measurement value of the wiring harness is within the specified range of the standard wiring harness signal value when the wiring harness is fault-free, the fault simulation instruction corresponding to the faulty wiring harness signal is transmitted to the corresponding wiring harness signal receiving component. If the wiring harness signal receiving component reproduces the automobile component fault corresponding to the faulty wiring harness signal, the vehicle component that may have the wiring harness signal fault is determined to be the faulty component.

[0013] The beneficial effects of the present invention are as follows: When a car breaks down, some problems involving the car's control circuits and equipment are relatively hidden, making occasional failures difficult to reproduce and difficult to analyze, causing inconvenience for users and car manufacturers to solve and improve the problem. The integrated multifunctional device and method of the present invention can monitor, record, and compare the voltage, current, and resistance status of the wiring harness, CAN network signals, and video signals for a long period of time to diagnose and compare them with design specifications. The present invention not only comprehensively analyzes and measures problems related to the wiring harness, but also, in addition to traditional passive recording, can actively simulate the actual vehicle electrical logic to trigger a suspected failure scenario multiple times, saving manpower and time and reducing the difficulty of reproduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of an automobile fault reproduction and diagnosis device provided by an embodiment of the present invention; Figure 2 A schematic diagram of a vehicle window control process provided by an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: like Figure 3 As shown, a vehicle fault reproduction and diagnosis device based on wiring harness signals includes: The signal measurement module is used to measure the wiring harness signal emitted by a vehicle component that may have a wiring harness signal fault, and obtain a measurement value of the wiring harness signal; The data processing module is used to compare the measured value of the wiring harness signal with a standard wiring harness signal value when the wiring harness signal is normal. When the measured value of the wiring harness signal is not within a specified range of the standard wiring harness signal value when the wiring harness is normal, the wiring harness signal is determined to be a faulty wiring harness signal, and the vehicle component that may have a wiring harness signal fault is determined to be a faulty component. The fault reproduction module is used to transmit the fault simulation instruction corresponding to the faulty wiring harness signal to the corresponding wiring harness signal receiving component when the signal measurement value of the wiring harness is within the range specified by the standard wiring harness signal value when the wiring harness is not faulty. If the wiring harness signal receiving component reproduces the automobile component fault corresponding to the faulty wiring harness signal, it is determined that the vehicle component that may have the wiring harness signal fault is the faulty component.

[0017] Figure 1 This is a schematic diagram of an automobile fault reproduction and diagnosis device provided by an embodiment of the present invention. The left side of the device is a passive measurement, recording, and analysis terminal, and the right side is an active trigger simulation terminal. Both ends can process multiple signals. The passive measurement, recording, and analysis terminal and the active trigger simulation terminal have multiple wires and interfaces. The passive measurement, recording, and analysis terminal is used to measure the current, voltage, and resistance signals (pin A1) of a common current loop, the CAN / LIN message signal (pin B1) of a network loop, and the video signal Fakra / LVDS line signal (pin C1). The active trigger simulation terminal is used to actively trigger and output the current, voltage, and resistance signals (pin A) of a common current loop, the CAN / LIN message signal (pin B) of a network loop, and the video signal Fakra / LVDS line signal (pin C). The automobile fault reproduction and diagnosis device can measure and analyze the magnitude and amplitude waveforms of multiple electrical signals. Measurement modes and modes are switched through the controller panel. The control panel is also provided with control buttons, including operation buttons, adjustment knobs, switches, and a display screen. The automobile fault reproduction and diagnosis equipment is also provided with a signal processing unit, which is used to compare the wiring harness signal measurement value obtained by the passive measurement recording and analysis end with the standard wiring harness signal range value, and output the detection result of whether there is a fault in the wiring harness signal under test. When there is no fault in the wiring harness signal under test, the automobile fault reproduction and diagnosis equipment outputs the fault simulation instruction of the fault simulation signal corresponding to the wiring harness signal under test through the active triggering simulation end and transmits it to the wiring harness signal receiving component corresponding to the wiring harness signal under test.

[0018] Figure 2This is a schematic diagram of the window control process provided by an embodiment of the present invention. The diagram shows the system control components involved in driving vehicle window lifts. Wiring harnesses are connected at arrows, and text annotations above the arrows indicate the signal types carried by the harnesses at these locations. The window lift control method includes: the driver touches the vehicle's display screen to activate the window lift function. The touch action signal is converted by the vehicle's display screen into a digital signal (video signal) and transmitted via a video cable to an MP5 host. The MP5 host transmits the digital signal (video signal) via the high and low level signals of the CAN harness. The body domain controller, combined with the rain or shine signal (LIN message) transmitted by the sunlight and rain sensor, determines whether the window is open. After determining whether the window is open, the body domain controller outputs a first voltage signal through its drive pin, which is transmitted through the wiring harness. After the instrument harness and the door harness INLINE interface are connected, the instrument harness and the door harness INLINE interface output a second voltage signal to drive the window motor to lower the window. During this process, if the driver sends a window lift control signal via the wiring harness using the window switch on the door panel, the window motor drive system will either execute or not respond (according to the established command priority logic). The simple window opening action is easily affected by multiple components, as can be seen from the window control process. If any of these components experience poor wiring contact, inverted drive levels, software logic issues, or adhesion or loose connections in the door panel or window switch, the window will not rise or fall properly. This necessitates a detection and reproduction tool for measurement and diagnosis, or for proactively triggering reproduction. When a window fails to rise or fall properly, technicians, based on the window control process, identify the vehicle component with the potential wiring harness signal failure. The wiring harness signals emitted by these components include video signals, CAN message signals, LIN message signals, first control voltage signals, second control voltage signals, and control level signals.

[0019] It should be noted that for abnormal window lifting failures, when technicians cannot determine the specific vehicle components that may have wiring harness signal failures, they need to use automobile fault reproduction and diagnostic equipment to measure the wiring harness failures that may cause abnormal window lifting, such as Figure 2 In the embodiment shown, if the second voltage signal output by the INLINE interface of the instrument harness and the door harness is measured and a fault is found, the fault may be caused by upstream vehicle components such as the MP5 host and the body domain controller that may have a harness signal fault. Therefore, the best order for using automobile fault reproduction and diagnostic equipment to measure the harness faults that may cause abnormal window lifting and lowering is the video signal output by the vehicle display screen, the CAN message signal output by the MP5 host, the LIN message signal output by the sunlight and rain sensor, the first voltage signal output by the body domain controller, the second voltage signal output by the INLINE interface of the instrument harness and the door harness, and the control level signal output by the window control switch.

[0020] Example 1 In some technical solutions, when a vehicle has an abnormal window lifting failure, the technicians judge that the vehicle component that may have a wiring harness signal failure is the vehicle display screen, the wiring harness signal receiving component is the vehicle window, and the wiring harness signal sent by the vehicle display screen is a video signal. The impedance value, S parameter value and signal continuity of the video signal are obtained by measurement, and the impedance value and S parameter value of the video signal are compared with the range specified by the standard impedance value and the standard S parameter value when the video signal is fault-free. When the impedance value of the video signal is not within the range specified by the standard impedance value when the video signal is fault-free, or the S parameter value of the video signal is When the value is not within the range specified by the standard S parameter value when the video signal is fault-free, or the video signal is a discontinuous signal, it is determined that the video signal is a faulty wiring harness signal and the vehicle display screen is a faulty component; when the impedance value of the video signal is within the range specified by the standard impedance value when the video signal is fault-free, and the S parameter value of the video signal is within the range specified by the standard S parameter value when the video signal is fault-free, and the video signal is a continuous signal, the fault simulation instruction corresponding to the faulty video signal is transmitted to the vehicle window. If the vehicle window reproduces the abnormal window lifting and lowering fault, it is determined that the vehicle component with the wiring harness signal fault is the vehicle display screen.

[0021] Video signals are transmitted via the Fakra / LVDS cable. To measure the video signal, the video signal measurement cable on the passive measurement, recording, and analysis end of the vehicle fault reproduction and diagnostic equipment is plugged into the Fakra / LVDS cable connector, or the Fakra / LVDS cable is plugged into the passive measurement, recording, and analysis end. The vehicle fault reproduction and diagnostic equipment automatically calculates the video signal's impedance and S-parameter values ​​based on the measured video signal waveform. The measured signal waveform can be used to determine the continuity of the video signal and whether there are any discontinuities. The video signal's impedance represents the instantaneous resistance encountered by the signal as it propagates along the Fakra / LVDS cable, while the video signal's S-parameter values ​​represent matrix parameters describing the signal's "scattering" characteristics in the microwave frequency band. The video signal's impedance reflects signal integrity, while the S-parameters reflect the loss and interference mechanisms of high-frequency video signal transmission. To transmit the fault simulation command corresponding to the fault video signal to the vehicle window, the video signal measurement cable on the active trigger simulation end of the vehicle fault reproduction and diagnostic equipment is plugged into the Fakra / LVDS cable connector, or the Fakra / LVDS cable is plugged into the active trigger simulation end connector.

[0022] Example 2 In some technical solutions, when a vehicle experiences an abnormal window lift failure, technicians determine that the vehicle component that may have a wiring harness signal failure is the MP5 host, the wiring harness signal receiving component is the vehicle window, and the wiring harness signal emitted by the MP5 host is a CAN message signal. The time domain level sequence of the CAN message signal is measured and compared with the range specified by the standard time domain level sequence when the CAN message signal is fault-free. The range specified by the standard time domain level sequence when the CAN message signal is fault-free is the standard time domain level sequence of the CAN message signal itself. When the measured time domain level sequence of the CAN message signal is inconsistent with the range specified by the standard time domain level sequence when the CAN message signal is fault-free, it is determined that the CAN message signal is a fault signal and the MP5 host is the faulty component. When the measured time domain level sequence of the CAN message signal is consistent with the range specified by the standard time domain level sequence when the CAN message signal is fault-free, a fault simulation instruction corresponding to the faulty CAN message signal is transmitted to the vehicle window. When the vehicle window reproduces the abnormal window lift failure, it is determined that the vehicle component with the wiring harness signal failure is the MP5 host.

[0023] CAN message signals are transmitted via the CAN communication bus. To measure CAN message signals, simply plug the CAN signal measurement line from the passive measurement, recording, and analysis end of the vehicle fault reproduction and diagnostic equipment into the CAN bus interface, or plug the CAN bus into the interface of the passive measurement, recording, and analysis end. The vehicle fault reproduction and diagnostic equipment directly measures the CAN signal level waveform and the corresponding time-domain level sequence. The CAN message time-domain level sequence is a chronological sequence of 0s and 1s, corresponding to the low and high levels of the level waveform, respectively. When the measured CAN signal time-domain level sequence differs from the standard time-domain level signal when the CAN signal is fault-free, the CAN message signal sent by the MP5 host is determined to be faulty. When the fault simulation command corresponding to the fault video signal is transmitted to the vehicle window, plug the video signal measurement line from the active trigger simulation end of the vehicle fault reproduction and diagnostic equipment into the CAN line interface, or plug the CAN line into the active trigger simulation end interface.

[0024] Example 3 In some technical solutions, when a vehicle has an abnormal window lifting and lowering failure, technicians determine that the vehicle component that may have a wiring harness signal failure is the body domain controller, the wiring harness signal receiving component is the window, and the wiring harness signal emitted by the body domain controller is a first voltage signal. The measured voltage value of the first voltage signal is compared with the range specified by the standard voltage value when the first voltage signal is fault-free. When the measured voltage value of the first voltage signal is not within the range specified by the standard voltage value when the first voltage signal is fault-free, it is determined that the first voltage signal is a fault signal and the body domain controller is a faulty component; when the measured voltage value of the first voltage signal is within the range specified by the standard voltage value when the first voltage signal is fault-free, the fault simulation instruction corresponding to the first voltage signal is transmitted to the window. When the window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the body domain controller.

[0025] The first voltage signal is transmitted via the voltage signal line. When measuring the first voltage signal, the vehicle fault reproduction and diagnostic equipment can directly measure the voltage value of the first voltage signal by plugging the first voltage signal measurement line of the passive measurement, recording, and analysis terminal of the vehicle fault reproduction and diagnostic equipment into the control voltage output interface of the voltage signal line, or by plugging the first voltage signal line into the voltage signal interface of the passive measurement, recording, and analysis terminal. In some embodiments, if the wiring harness signal type is resistance or current, the vehicle fault reproduction and diagnostic equipment can directly measure the resistance value of the resistance signal or the current value of the current signal.

[0026] Example 4 In some technical solutions, when a vehicle experiences an abnormal window lifting and lowering failure, technicians determine that the vehicle component that may have a wiring harness signal failure is the sunlight and rain sensor, the wiring harness signal receiving component is the vehicle window, and the wiring harness signal emitted by the sunlight and rain sensor is a LIN message signal. The measured time domain level sequence of the LIN message signal is compared with the range specified by the standard time domain level sequence when the LIN message signal is faulty. The range specified by the standard time domain level sequence when the LIN message signal is faulty is the standard time domain level sequence of the LIN message signal itself. When the measured time domain level sequence of the LIN message signal is inconsistent with the range specified by the standard time domain level sequence when the LIN message signal is faulty, it is determined that the LIN message signal is a fault signal and the sunlight and rain sensor is a faulty component. When the measured time domain level sequence of the LIN message signal is consistent with the range specified by the standard time domain level sequence when the LIN message signal is faulty, a fault simulation instruction corresponding to the faulty LIN message signal is transmitted to the vehicle window. When the vehicle window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the sunlight and rain sensor.

[0027] LIN message signals are transmitted through the LIN communication bus. When measuring the LIN message signal, the LIN message signal measurement line of the passive measurement, recording and analysis end of the automobile fault reproduction and diagnosis equipment is inserted into the interface of the LIN bus, or the LIN bus is inserted into the LIN message signal interface of the passive measurement, recording and analysis end. The automobile fault reproduction and diagnosis equipment directly measures the waveform of the level signal of the LIN message signal and the time domain level sequence corresponding to the level signal waveform. The LIN message time domain level sequence is a sequence composed of 0s and 1s in time order, and 0 and 1 correspond to the low level and high level of the level signal waveform, respectively. When the measured time domain level sequence of the LIN message signal is different from the standard time domain level sequence when the LIN message signal is fault-free, it is determined that the LIN message signal emitted by the sunlight and rain sensor has a fault.

[0028] Example 5 In some technical solutions, when a vehicle has an abnormal window lifting and lowering failure, technicians determine that the vehicle component that may have a wiring harness signal failure is the instrument and door wiring harness INLINE interface, the wiring harness signal receiving component is the window, and the signal sent by the instrument and door wiring harness INLINE interface is a second voltage signal. The measured voltage value of the second voltage signal is compared with the range specified by the standard voltage value when the second voltage signal is fault-free. When the measured voltage value of the second voltage signal is not within the range specified by the standard voltage value when the second voltage signal is fault-free, it is determined that the second voltage signal is a fault signal and the instrument and door wiring harness INLINE interface is a faulty component; when the measured voltage value of the second voltage signal is within the range specified by the standard voltage value when the second voltage signal is fault-free, the fault simulation instruction corresponding to the second voltage signal fault signal is transmitted to the window. When the window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the instrument and door wiring harness INLINE interface.

[0029] The second voltage signal is transmitted through the voltage signal line. When measuring the second voltage signal, the voltage signal measurement line of the passive measurement, recording and analysis end of the automobile fault reproduction and diagnosis equipment is inserted into the output interface of the voltage signal line, or the second voltage signal line is inserted into the voltage signal interface of the passive measurement, recording and analysis end. The automobile fault reproduction and diagnosis equipment directly measures and obtains the voltage measurement value of the second voltage signal.

[0030] Example 6 In some technical solutions, when a vehicle has an abnormal window lifting and lowering failure, the technician determines that the vehicle component that may have a wiring harness signal failure is the window control switch, the wiring harness signal receiving component is the window, and the signal sent by the window control switch is a digital level signal. The measured digital level value is compared with the range specified by the standard digital level value when the digital level signal is fault-free. When the measured digital level value is not within the range specified by the standard digital level value when the digital level signal is fault-free, it is determined that the digital level signal is a fault signal and the window control switch is a faulty component; when the measured digital level value is within the range specified by the standard digital level value when the digital level signal is fault-free, the fault simulation instruction corresponding to the faulty digital level signal is transmitted to the window. When the window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the window control switch.

[0031] The digital level signal is transmitted via a digital level signal line. The digital level signal emitted by the window control switch is actually a voltage control signal. Different control voltages reflect different control instructions. In some embodiments, when the digital level signal is set to 12V, the window control instruction is to raise the window with one click. When the digital level signal is set to 8V, the window control instruction is to gradually raise the window as the window button is continuously pressed. When the digital level signal is set to 5V, the window control instruction is to completely lower the window with one click. When the digital level signal is set to 3V, the window gradually lowers as the window button is continuously pressed. When the digital level signal is 0V, the window control instruction is to not operate the window. When measuring the digital level signal line, the voltage signal measurement line of the passive measurement, recording, and analysis terminal of the vehicle fault reproduction and diagnosis equipment is connected to the output interface of the digital level signal, or the digital level signal line is connected to the voltage measurement interface of the passive measurement, recording, and analysis terminal. The vehicle fault reproduction and diagnosis equipment directly measures the voltage value of the digital level signal. When the voltage value corresponding to the digital level signal is different from the voltage value range of the digital level signal when the digital level signal is normal, the signal emitted by the window control switch is determined to be a digital level signal and a fault signal.

[0032] In some technical solutions, a method for measuring a wiring harness signal emitted by a vehicle component that may have a wiring harness signal failure and obtaining a measurement value of the wiring harness signal includes: selecting a corresponding signal measurement harness according to the type of the wiring harness signal to be measured, directly measuring the signal wiring harness to be measured through the signal measurement harness, and obtaining a measurement value of the wiring harness signal to be measured.

[0033] The wiring harness and interface of the passive measurement, recording, and analysis end of the automobile fault reproduction and diagnosis equipment are used to measure whether the measured values ​​(video signal, CAN message signal, LIN message signal, power current signal, and control level signal) of the wiring harness signal emitted by the vehicle component that may have a wiring harness signal fault are within the standard range value when the wiring harness signal is normal. When the measured value of the wiring harness signal is not within the standard range value when the wiring harness signal is normal, it can be directly determined that the vehicle component that emits the wiring harness signal has a fault, and the fault reproduction and diagnosis equipment automatically outputs the conclusion that the wiring harness signal has a fault. When the measured value of the wiring harness signal is within the standard range value when the wiring harness signal is normal, in order to avoid the wiring harness signal fault occurring only under specific conditions or sporadically, resulting in the wiring harness signal fault not being measured, the faulty wiring harness signal emitted by the active triggering simulation end is used to replace the wiring harness signal emitted by the vehicle component that may have a wiring harness signal fault to control the vehicle window. When the vehicle window has an abnormal lifting and lowering fault, it is determined that the vehicle component that may have a wiring harness signal fault is indeed the faulty component. The present invention uses an integrated multifunctional device to monitor, record and compare the wiring harness voltage, current, resistance status, CAN network signal and video signal with the design specification for a long time. It can not only comprehensively analyze and measure the problems related to the wiring harness, but also, in addition to traditional passive recording, it can actively simulate the actual vehicle electrical logic to trigger a suspected failure scenario multiple times, saving manpower and time and reducing the difficulty of reproduction.

[0034] Example 7 According to the automobile fault reproduction and diagnosis device based on wiring harness electrical signals, a method for automobile fault reproduction and diagnosis based on wiring harness electrical signals includes: measuring a wiring harness signal emitted by a vehicle component that may have a wiring harness signal fault, and obtaining a measurement value of the wiring harness signal; comparing the measured value of the wiring harness signal with a standard wiring harness signal value when the wiring harness signal is normal; and determining that the wiring harness signal is a faulty wiring harness signal and that a vehicle component that may have a wiring harness signal fault is a faulty component when the measured value of the wiring harness signal is not within a specified range of the standard wiring harness signal value when the wiring harness signal is normal; When the signal measurement value of the wiring harness is within the specified range of the standard wiring harness signal value when the wiring harness is fault-free, the fault simulation instruction corresponding to the faulty wiring harness signal is transmitted to the corresponding wiring harness signal receiving component. If the wiring harness signal receiving component reproduces the automobile component fault corresponding to the faulty wiring harness signal, the vehicle component that may have the wiring harness signal fault is determined to be the faulty component.

[0035] Example 8 A computer program product includes a computer program, which implements the steps of the method described in Example 7 when executed by a processor.

[0036] It will be easily understood by those skilled in the art that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

[0037] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A vehicle fault reproduction and diagnosis device based on wiring harness signals, characterized in that: It includes: The signal measurement module is used to measure the wiring harness signal emitted by a vehicle component that may have a wiring harness signal fault, and obtain a measurement value of the wiring harness signal; The data processing module is used to compare the measured value of the wiring harness signal with a standard wiring harness signal value when the wiring harness signal is normal. When the measured value of the wiring harness signal is not within a specified range of the standard wiring harness signal value when the wiring harness is normal, the wiring harness signal is determined to be a faulty wiring harness signal, and the vehicle component that may have a wiring harness signal fault is determined to be a faulty component. The fault reproduction module is used to transmit the fault simulation instruction corresponding to the faulty wiring harness signal to the corresponding wiring harness signal receiving component when the signal measurement value of the wiring harness is within the range specified by the standard wiring harness signal value when the wiring harness is not faulty. If the wiring harness signal receiving component reproduces the automobile component fault corresponding to the faulty wiring harness signal, it is determined that the vehicle component that may have the wiring harness signal fault is the faulty component.

2. The automobile fault reproduction and diagnosis device based on wiring harness signals according to claim 1, characterized in that: The vehicle component that may have a wiring harness signal failure is the vehicle display screen, the wiring harness signal receiving component is the vehicle window, and the wiring harness signal emitted by the vehicle display screen is a video signal. The impedance value and S parameter value of the video signal are obtained by measurement, and the impedance value and S parameter value of the video signal are compared with the range specified by the standard impedance value and the range specified by the standard S parameter value when the video signal is fault-free. When the impedance value of the video signal is not within the range specified by the standard impedance value when the video signal is fault-free, or the S parameter value of the video signal is not within the range specified by the standard S parameter value when the video signal is fault-free, it is determined that the video signal is a faulty wiring harness signal and the vehicle display screen is a faulty component; when the impedance value of the video signal is within the range specified by the standard impedance value when the video signal is fault-free, and the S parameter value of the video signal is within the range specified by the standard S parameter value when the video signal is fault-free, the fault simulation instruction corresponding to the faulty video signal is transmitted to the vehicle window. If the vehicle window reproduces the fault of abnormal window lifting and lowering, it is determined that the vehicle component with the wiring harness signal failure is the vehicle display screen.

3. The automobile fault reproduction and diagnosis device based on wiring harness signals according to claim 1, characterized in that: The vehicle component that may have a wiring harness signal fault is the MP5 host, the wiring harness signal receiving component is the vehicle window, and the wiring harness signal emitted by the MP5 host is a CAN message signal. The measured time domain level sequence of the CAN message signal is compared with the range specified by the standard time domain level sequence when the CAN message signal is fault-free. The range specified by the standard time domain level sequence when the CAN message signal is fault-free is the standard time domain level sequence of the CAN message signal itself. When the measured time domain level sequence of the CAN message signal is inconsistent with the range specified by the standard time domain level sequence when the CAN message signal is fault-free, it is determined that the CAN message signal is a fault signal and the MP5 host is a faulty component; when the measured time domain level sequence of the CAN message signal is consistent with the range specified by the standard time domain level sequence when the CAN message signal is fault-free, the fault simulation instruction corresponding to the faulty CAN message signal is transmitted to the vehicle window. When the vehicle window reproduces the abnormal window lifting and lowering fault, it is determined that the vehicle component with the wiring harness signal fault is the MP5 host.

4. The automobile fault reproduction and diagnosis device based on wiring harness signals according to claim 1, characterized in that: The vehicle component that may have a wiring harness signal failure is the body domain controller, the wiring harness signal receiving component is the window, and the wiring harness signal emitted by the body domain controller is a first voltage signal. The measured voltage value of the first voltage signal is compared with the specified range of the standard voltage value when the first voltage signal is fault-free. When the measured voltage value of the first voltage signal is not within the specified range of the standard voltage value when the first voltage signal is fault-free, it is determined that the first voltage signal is a fault signal and the body domain controller is a faulty component; when the measured voltage value of the first voltage signal is within the specified range of the standard voltage value when the first voltage signal is fault-free, the fault simulation instruction corresponding to the first voltage signal is transmitted to the window. When the window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the body domain controller.

5. The automobile fault reproduction and diagnosis device based on wiring harness signals according to claim 1, characterized in that: The vehicle component that may have a wiring harness signal failure is the sunlight and rain sensor, the wiring harness signal receiving component is the vehicle window, and the wiring harness signal emitted by the sunlight and rain sensor is a LIN message signal. The measured time domain level sequence of the LIN message signal is compared with the range specified by the standard time domain level sequence when the LIN message signal is faulty. The range specified by the standard time domain level sequence when the LIN message signal is faulty is the standard time domain level sequence of the LIN message signal itself. When the measured time domain level sequence of the LIN message signal is inconsistent with the range specified by the standard time domain level sequence when the LIN message signal is faulty, it is determined that the LIN message signal is a fault signal and the sunlight and rain sensor is a faulty component. When the measured time domain level sequence of the LIN message signal is consistent with the range specified by the standard time domain level sequence when the LIN message signal is faulty, the fault simulation instruction corresponding to the faulty LIN message signal is transmitted to the vehicle window. When the vehicle window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the sunlight and rain sensor.

6. The automobile fault reproduction and diagnosis device based on wiring harness signals according to claim 1, characterized in that: The vehicle component that may have a wiring harness signal failure is the instrument and door wiring harness INLINE interface, the wiring harness signal receiving component is the vehicle window, and the signal sent by the instrument and door wiring harness INLINE interface is a second voltage signal. The measured voltage value of the second voltage signal is compared with the specified range of the standard voltage value when the second voltage signal is fault-free. When the measured voltage value of the second voltage signal is not within the specified range of the standard voltage value when the second voltage signal is fault-free, it is determined that the second voltage signal is a fault signal, and the instrument and door wiring harness INLINE interface is a faulty component; when the measured voltage value of the second voltage signal is within the specified range of the standard voltage value when the second voltage signal is fault-free, the fault simulation instruction corresponding to the second voltage signal fault signal is transmitted to the vehicle window. When the vehicle window reproduces the abnormal window lifting and lowering failure, it is determined that the vehicle component with the wiring harness signal failure is the instrument and door wiring harness INLINE interface.

7. The automobile fault reproduction and diagnosis device based on wiring harness signals according to claim 1, characterized in that: The vehicle component that may have a wiring harness signal fault is the window control switch, the wiring harness signal receiving component is the window, and the signal emitted by the window control switch is a digital level signal. The measured digital level value is compared with the range specified by the standard digital level value when the digital level signal is fault-free. When the measured digital level value is not within the range specified by the standard digital level value when the digital level signal is fault-free, it is determined that the digital level signal is a fault signal and the window control switch is a faulty component; when the measured digital level value is within the range specified by the standard digital level value when the digital level signal is fault-free, the fault simulation instruction corresponding to the faulty digital level signal is transmitted to the window. When the window reproduces the abnormal window lifting and lowering fault, it is determined that the vehicle component with the wiring harness signal fault is the window control switch.

8. The automobile fault reproduction and diagnosis device based on wiring harness signals according to claim 1, characterized in that: A method for measuring a wiring harness signal emitted by a vehicle component that may have a wiring harness signal fault and obtaining a measurement value of the wiring harness signal includes: selecting a corresponding signal measurement harness according to the type of the wiring harness signal to be measured, directly measuring the signal wiring harness to be measured through the signal measurement harness, and obtaining a measurement value of the wiring harness signal to be measured.

9. The automobile fault reproduction and diagnosis method based on wiring harness electrical signals of the automobile fault reproduction and diagnosis device based on wiring harness electrical signals according to claim 1 is characterized in that: It includes: measuring a wiring harness signal emitted by a vehicle component that may have a wiring harness signal fault, and obtaining a measurement value of the wiring harness signal; comparing the measured value of the wiring harness signal with a standard wiring harness signal value when the wiring harness signal is normal; and determining that the wiring harness signal is a faulty wiring harness signal and that a vehicle component that may have a wiring harness signal fault is a faulty component when the measured value of the wiring harness signal is not within a specified range of the standard wiring harness signal value when the wiring harness signal is normal; When the signal measurement value of the wiring harness is within the specified range of the standard wiring harness signal value when the wiring harness is fault-free, the fault simulation instruction corresponding to the faulty wiring harness signal is transmitted to the corresponding wiring harness signal receiving component. If the wiring harness signal receiving component reproduces the automobile component fault corresponding to the faulty wiring harness signal, the vehicle component that may have the wiring harness signal fault is determined to be the faulty component.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to claim 9 are implemented.

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