Fault detection devices, systems and methods

Abstract

This application relates to a fault detection device, system, and method. The fault detection device includes: an interface component for detachably connecting to a wiring harness connector and transmitting a test signal from the wiring harness connector; a signal acquisition component connected to the interface component for acquiring a power signal, a ground signal, and an address signal from the test signal; and a signal detection component connected to the signal acquisition component for determining whether the wiring harness connector is faulty under a target operating mode, based on threshold data and the received power signal, ground signal, and address signal. The target operating mode includes one of an upstream nitrogen / oxygen sensor detection mode and a downstream nitrogen / oxygen sensor detection mode. The fault detection device of this application can detect nitrogen / oxygen signal faults not caused by the nitrogen / oxygen sensor itself, and has high detection efficiency and accuracy.

Description

Technical Field

[0001] This application relates to the field of fault detection technology, and in particular to a fault detection device, system and method. Background Technology

[0002] With the upgrading of environmental regulations and the improvement of environmental awareness, all diesel engine road vehicles are now required to install nitrogen oxide sensors to detect the nitrogen oxide content in exhaust emissions. Furthermore, with the tightening of national standards, most vehicles now require both upstream and downstream nitrogen oxide sensors. These two sensors work together to detect and control exhaust pollutants, resulting in a significant increase in the overall vehicle nitrogen oxide-related failure rate.

[0003] Current nitrogen and oxygen sensor troubleshooting devices can only detect nitrogen and oxygen signal faults caused by the nitrogen and oxygen sensor itself. For nitrogen and oxygen signal faults not caused by the nitrogen and oxygen sensor itself, i.e., those caused by the wiring harness connectors connected to the nitrogen and oxygen sensor, troubleshooting can only be done using a multimeter and manual judgment. This method is not only inefficient, but also prone to misdiagnosis due to human judgment. Summary of the Invention

[0004] Therefore, it is necessary to provide a fault detection device, system, and method to address the aforementioned technical problems, which can efficiently and accurately detect abnormal nitrogen and oxygen signals caused by reasons other than those of the nitrogen and oxygen sensor itself.

[0005] A fault detection device, the fault detection device comprising:

[0006] An interface component for detachably connecting to a wiring harness connector for transmitting the test signal of the wiring harness connector;

[0007] A signal acquisition component, connected to the interface component, is used to acquire the power signal, ground signal, and address signal from the signal to be detected.

[0008] A signal detection component, connected to the signal acquisition component, is used to determine whether the wiring harness connector is faulty based on threshold data and the received power signal, ground signal, and address signal under a target operating mode; wherein the target operating mode includes one of an upstream nitrogen and oxygen sensor detection mode and a downstream nitrogen and oxygen sensor detection mode.

[0009] In one embodiment, the fault detection device further includes:

[0010] A communication component is connected to the interface component and the signal detection component respectively, and is used to receive multiple communication signals from the wiring harness connector via the interface component;

[0011] The signal detection component is connected to the communication component and is used to receive multiple communication signals and determine whether the communication function of the wiring harness connector is faulty based on the multiple communication signals.

[0012] In one embodiment, the interface component includes:

[0013] The power pin is connected to the wiring harness connector and is used to transmit the power signal;

[0014] The grounding pin is connected to the wiring harness connector and is used to transmit the grounding signal;

[0015] The address switch pin is connected to the wiring harness connector and is used to transmit the address signal;

[0016] The first communication pin is connected to the wiring harness connector and is used to transmit the first sub-signal among the multiple communication signals.

[0017] The second communication pin is connected to the mating harness connector and is used to transmit the second sub-signal among the multiple communication signals.

[0018] In one embodiment, the signal detection component includes:

[0019] An analog-to-digital converter, connected to the signal acquisition component, is used to convert the analog power signal, the ground signal and the address signal into digital power signals, digital ground signals and digital address signals, respectively.

[0020] The processor is connected to the analog-to-digital converter and the communication component, respectively, and is used to detect whether the wiring harness connector is in a normal state based on the threshold data, the digital power signal, the digital ground signal and the digital address signal, the first sub-signal and the second sub-signal.

[0021] In one embodiment, the fault diagnosis device further includes:

[0022] A display component, connected to the signal detection component, is used to display the detection results of the signal detection component.

[0023] In one embodiment, the fault diagnosis device further includes:

[0024] A mode selection component, connected to the signal detection component, is used to receive user operation instructions and determine the target operating mode of the signal detection component according to the operation instructions; wherein, the address threshold in the threshold data is different depending on the target operating mode.

[0025] A fault detection system includes: a wiring harness connector, an engine control unit, a power supply, and a fault detection device as described above, wherein the engine control unit is connected to the wiring harness connector and communicates with the fault detection device via the wiring harness connector; the power supply is connected to both the engine control unit and the wiring harness connector, and provides the wiring harness connector with the power signal and the ground signal.

[0026] A fault detection method, applied to the aforementioned fault detection system, the method comprising:

[0027] Acquire the detection signal of the wiring harness connector, wherein the detection signal includes a power signal, a ground signal, an address signal, a first sub-signal and a second sub-signal;

[0028] In the target operating mode, the fault status of the wiring harness connector is determined based on threshold data and the power signal, the ground signal, the address signal, the first sub-signal, and the second sub-signal. The target operating mode includes one of the upstream nitrogen and oxygen sensor detection mode and the downstream nitrogen and oxygen sensor detection mode.

[0029] In one embodiment, determining whether the wiring harness connector is faulty based on threshold data and the power signal, the ground signal, and the address signal in the target operating mode includes:

[0030] If the power signal is at a high level, it is determined that the power signal is normal.

[0031] If the grounding signal is at a low level, it is determined that the grounding signal is normal.

[0032] If the target operating mode is the upstream nitrogen and oxygen sensor detection mode and the address signal is low, then the address signal is determined to be normal.

[0033] If the target operating mode is the downstream nitrogen and oxygen sensor detection mode and the address signal is floating, then the address signal is determined to be normal.

[0034] If communication with the engine control unit is successful, the first sub-signal and the second sub-signal are determined to be normal.

[0035] In one embodiment, the troubleshooting method further includes:

[0036] When the power signal is normal, the first power detection result is output and displayed; when the power signal is abnormal, the second power detection result is output and displayed.

[0037] If the grounding signal is normal, output and display the first grounding detection result; if the grounding signal is abnormal, output and display the second grounding detection result.

[0038] If the address signal is normal, output and display the first address detection result; if the address signal is abnormal, output and display the second address detection result.

[0039] If the first sub-signal and the second sub-signal are normal, output and display the first communication detection result; if the first sub-signal and the second sub-signal are abnormal, output and display the second communication detection result.

[0040] The aforementioned fault detection device, system, and method are detachably connected to the wiring harness connector via an interface component and connected to a signal acquisition component. After receiving the power signal, ground signal, and address signal from the wiring harness connector, the received power signal, ground signal, and address signal are transmitted to the signal detection component via the signal acquisition component. The signal detection component can determine whether a fault exists in the wiring harness connector based on the corresponding target operating mode, such as the upstream nitrogen and oxygen sensor detection mode or the downstream nitrogen and oxygen sensor detection mode, according to threshold data and the received power signal, ground signal, and address signal. The fault detection device, system, and method of this application can detect nitrogen and oxygen signal faults caused by reasons other than the nitrogen and oxygen sensor itself without relying on a multimeter or manual judgment, improving detection efficiency and judgment accuracy. Furthermore, the fault detection device provided in this application can be detachably connected to the wiring harness connector, facilitating assembly and use by technicians. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the fault detection device in one embodiment;

[0043] Figure 2 This is a schematic diagram of the fault detection device in another embodiment;

[0044] Figure 3 This is a schematic diagram of the fault detection device in another embodiment;

[0045] Figure 4 This is a schematic diagram of the fault detection device in another embodiment;

[0046] Figure 5 This is a schematic diagram of the fault detection device in another embodiment;

[0047] Figure 6 This is a schematic diagram of the fault detection device in another embodiment;

[0048] Figure 7 This is a schematic diagram of the fault detection device in another embodiment;

[0049] Figure 8 This is a flowchart illustrating a fault detection method in one embodiment;

[0050] Figure 9 This is a flowchart illustrating step S802 in one embodiment;

[0051] Figure 10 This is a flowchart illustrating a fault detection method in another embodiment.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1-Interface component, 11-Power supply pin, 12-Ground pin, 13-Address switch pin, 14-First communication pin, 15-Second communication pin, 2-Signal acquisition component, 3-Signal detection component, 31-Analog-to-digital converter, 32-Processor, 4-Wiring harness connector, 41-Upstream wiring harness connector, 42-Downstream wiring harness connector, 5-Engine control unit, 6-Power supply, 7-Communication component, 8-Mode selection component, 9-Display component. Detailed Implementation

[0054] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0056] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0057] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0058] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0059] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0060] In one embodiment, such as Figure 1 As shown, this application provides a fault detection device, which includes: an interface component 1, a signal acquisition component 2, and a signal detection component 3.

[0061] Interface component 1 is detachably connected to the wiring harness connector 4 and is used to transmit the test signals of the wiring harness connector 4, which can be an upstream or downstream wiring harness connector. Signal acquisition component 2 is connected to interface component 1 and is used to acquire the power signal, ground signal, and address signal from the test signals. Signal detection component 3 is connected to signal acquisition component 2 and is used to determine whether the wiring harness connector 4 is faulty based on threshold data and the received power signal, ground signal, and address signal under the target operating mode. The target operating mode includes one of an upstream nitrogen / oxygen sensor detection mode and a downstream nitrogen / oxygen sensor detection mode. When the target operating mode is the upstream nitrogen / oxygen sensor detection mode, signal detection component 3 determines whether the upstream wiring harness connector is faulty based on each test signal; when the target operating mode is the downstream nitrogen / oxygen sensor detection mode, signal detection component 3 determines whether the downstream wiring harness connector is faulty based on each test signal.

[0062] Understandable, such as Figure 2 and Figure 3 As shown, the wiring harness connector 4 has five pins: Ubat, GND, address switch, CAN_High, and CAN_low, for detachable connection to the nitrogen oxide sensor or the fault detection device of this application. The wiring harness connector 4 also includes multiple signal lines, such as a power signal line, a ground signal line, an address switch signal line, and a CAN (Controller Area Network) signal line. The CAN signal line includes two coiled signal lines: CAN_High and CAN_low. The power signal line, ground signal line, and CAN signal line are connected to the engine control unit 5. The power signal line and ground signal line of the wiring harness connector 4 are also connected to the positive and negative terminals of the power supply 6, respectively. The connection relationship of the address switch signal line of the wiring harness connector 4 varies depending on the wiring harness connector. Figure 2 As shown, when the wiring harness connector 4 is the upstream wiring harness connector 41, the address switch signal line of the upstream wiring harness connector 41 is connected to the negative terminal of the power supply 6. Figure 3 As shown, when the wiring harness connector 4 is the downstream wiring harness connector 42, the address switch signal line of the downstream wiring harness connector 42 is left floating, that is, the address switch signal line of the downstream wiring harness connector 42 is not connected to the power supply 6.

[0063] When the nitrogen oxide (NOx) signal is normal, the upstream NOx sensor is normally connected to the upstream wiring harness connector 41, and the downstream NOx sensor is normally connected to the downstream wiring harness connector 42. The concentration of NOx compounds in the exhaust gas is measured and fed back to the engine control unit 5 in real time through the upstream and downstream wiring harness connectors 41 and 42. The engine control unit 5 then implements closed-loop control of the NOx concentration based on the received information. When the NOx signal is abnormal, the upstream or downstream NOx sensor can be disconnected from the wiring harness connector 41. Depending on the specific requirements, the fault detection device can be connected to the upstream wiring harness connector 41 corresponding to the upstream NOx sensor or the downstream wiring harness connector 42 corresponding to the downstream NOx sensor. When the fault detection device is connected to the upstream wiring harness connector, the target operating mode is the upstream NOx sensor detection mode; when the fault detection device is connected to the downstream wiring harness connector, the target operating mode is the downstream NOx sensor detection mode.

[0064] After the fault detection device is connected to the wiring harness connector 4, the interface component 1 can receive power signals, ground signals, and address signals through the pins of the wiring harness connector 4. The power signal is the signal on the power signal line of the wiring harness connector 4, the ground signal is the signal on the ground signal line of the wiring harness connector 4, and the address signal is the signal on the address switch signal line of the wiring harness connector 4. After the interface component 1 receives the power signals, ground signals, and address signals through the pins of the wiring harness connector 4, it can send the received power signals, ground signals, and address signals to the signal detection component 3 through the signal acquisition component 2. The signal detection component 3 can then determine whether there is a fault in the wiring harness connector 4 based on threshold data and the received power signals, ground signals, and address signals in the target operating mode. To ensure that the power signals, ground signals, and address signals can be successfully transmitted to the signal detection component 3, the signal acquisition component 2 includes components such as pull-up resistors and pull-down resistors. The specific circuit structure of the signal acquisition component 2 can be set according to user requirements, and this application does not impose any restrictions.

[0065] The aforementioned fault detection device, system, and method are detachably connected to the wiring harness connector via an interface component and connected to a signal acquisition component. After receiving the power signal, ground signal, and address signal from the wiring harness connector, the received power signal, ground signal, and address signal are transmitted to the signal detection component via the signal acquisition component. The signal detection component can determine whether a fault exists in the wiring harness connector based on threshold data and the received power signal, ground signal, and address signal, according to the corresponding target operating mode, such as the upstream nitrogen and oxygen sensor detection mode or the downstream nitrogen and oxygen sensor detection mode. The fault detection device, system, and method of this application can detect nitrogen and oxygen signal faults caused by reasons other than the nitrogen and oxygen sensor itself without relying on a multimeter or manual judgment, thus improving detection efficiency and judgment accuracy.

[0066] In one embodiment, such as Figure 4 As shown, the fault detection device also includes a communication component 7. The communication component 7 is connected to both the interface component 1 and the signal detection component 3, and is used to receive multiple communication signals from the wiring harness connector 4 via the interface component 1. The signal detection component 3 is connected to the communication component 7 and is used to receive the multiple communication signals and determine whether the communication function of the wiring harness connector 4 is faulty based on the multiple communication signals.

[0067] Communication component 7 can acquire multiple communication signals from the upstream wiring harness connector 4 through interface component 1. Taking the upstream wiring harness connector 41 as an example, when interface component 1 is connected to the upstream wiring harness connector 41, communication component 7 can acquire multiple communication signals from the CAN_High and CAN_Low signal lines of the upstream wiring harness connector 41 through interface component 1. Communication component 7 can process the acquired multiple communication signals by compiling and decoding, and then transmit the processed multiple communication signals to signal detection component 3. Signal detection component 3 determines whether the communication function of the wiring harness connector 4 is faulty based on the multiple communication signals. Specifically, communication component 7 can be a CAN transceiver.

[0068] In one embodiment, such as Figure 5 As shown, interface component 1 includes: a power supply pin 11, a ground pin 12, an address switch pin 13, a first communication pin 14, and a second communication pin 15. Power supply pin 11 is connected to the wiring harness connector 4 and is used to transmit a power signal. Ground pin 12 is connected to the wiring harness connector 4 and is used to transmit a ground signal. Address switch pin 13 is connected to the wiring harness connector 4 and is used to transmit an address signal. First communication pin 14 is connected to the wiring harness connector 4 and is used to transmit a first sub-signal among multiple communication signals. Second communication pin 15 is connected to the wiring harness connector 4 and is used to transmit a second sub-signal among multiple communication signals.

[0069] In the following embodiments, the connection between interface component 1 and upstream wiring harness connector 41 is still used as an example for explanation. Power pin 11 is connected to the Ubat pin of upstream wiring harness connector 41 to receive the power signal on the power signal line of upstream wiring harness connector 41 and send the power signal to signal acquisition component 2. Ground pin 12 is connected to the GND pin of upstream wiring harness connector 41 to receive the ground signal on the ground signal line of upstream wiring harness connector 41 and send the ground signal to signal acquisition component 2. Address switch pin 13 is connected to the address switch pin of upstream wiring harness connector 41 to receive the address signal on the address switch signal line of upstream wiring harness connector 41 and send the address signal to signal acquisition component 2. First communication pin 14 is connected to the CAN_High pin of upstream wiring harness connector 41 to receive the first sub-signal on the CAN_High signal line of upstream wiring harness connector 41 and send the first sub-signal to communication component 7. The second communication pin 15 is connected to the CAN_low pin of the upstream wiring harness connector 41 to receive the second sub-signal on the CAN_low signal line of the upstream wiring harness connector 41 and send the second sub-signal to the communication component 7.

[0070] In one embodiment, such as Figure 6 As shown, the signal detection component 3 includes an analog-to-digital converter 31 and a processor 32. The analog-to-digital converter 31 is connected to the signal acquisition component 2 and is used to convert the analog power signal, ground signal, and address signal into digital power signals, digital ground signals, and digital address signals, respectively. The processor 32 is connected to the analog-to-digital converter 31 and the communication component 7, and is used to detect whether the wiring harness connector 4 is in a normal state based on threshold data, digital power signals, digital ground signals, digital address signals, the first sub-signal, and the second sub-signal.

[0071] To enable the processor 32 to more accurately determine whether the power signal, ground signal, and address signal on the wiring harness connector 4 are in an abnormal state, the analog-to-digital converter 31 needs to convert the analog power signal, ground signal, and address signal into digital power signals, digital ground signals, and digital address signals, respectively, thus converting each voltage signal into a digital signal. For example, the power supply 6 is a 24V battery. When the power signal from the upstream wiring harness connector 41 is normal, the power signal is 24V. The analog-to-digital converter can convert this 24V power signal into a digital power signal, such as 1, indicating a high-level power signal. When the processor 32 receives a high-level power signal, it determines that the power signal is normal based on a preset power threshold 1 corresponding to the upstream wiring harness connector 41's power signal. Conversely, when the processor 32 receives a low-level power signal, it determines that the power signal is abnormal based on the preset power threshold 1 corresponding to the upstream wiring harness connector 41's power signal. To illustrate again, since the address switch signal line of the upstream wiring harness connector 41 is connected to the negative terminal of the power supply, the address signal of the upstream wiring harness connector 41 should theoretically be 0V. The analog-to-digital converter can convert this 0V address signal into an address signal, such as 0, which indicates that the digital address signal is low. When the processor 32 receives a low-level address signal, it determines that the address signal is normal according to the preset address threshold 0 corresponding to the address signal of the upstream wiring harness connector 41. Conversely, when the processor 32 receives a high-level address signal, it determines that the address signal is abnormal according to the preset address threshold 0 corresponding to the address signal of the upstream wiring harness connector 41.

[0072] The processor 32 is also connected to the communication component 7 to receive the first and second sub-signals processed by the communication component 7. The processor 32 performs a handshake communication with the engine control unit 5 based on the processed first and second sub-signals. If the processor 32 successfully establishes handshake communication with the engine control unit 5, the processor 32 can determine that the first and second sub-signals of the wiring harness connector 4 are normal, meaning that the communication function of the wiring harness connector 4 is normal. Conversely, if the processor 32 fails to communicate with the engine control unit 5, the processor 32 can determine that the first and second sub-signals of the wiring harness connector 4 are abnormal, meaning that the communication function of the wiring harness connector 4 is abnormal. Through the fault diagnosis device of this application, various abnormalities of the wiring harness connector 4 can be directly detected, which not only improves the detection efficiency but also the accuracy of the detection results.

[0073] In one embodiment, such as Figure 7As shown, the troubleshooting device also includes a mode selection component 8 and a display component 9. The mode selection component 8 is connected to the signal detection component 3 and is used to receive user operation commands and determine the target operating mode of the signal detection component 3 based on the operation commands; wherein, different target operating modes result in different address thresholds in the threshold data. The display component 9 is connected to the signal detection component 3 and is used to display the detection results of the signal detection component 3.

[0074] Specifically, both the mode selection component 8 and the display component 9 are connected to the processor 32 in the signal detection component 3. When the technician connects the interface component 1 to the mating harness connector 4, the technician can select the corresponding target working mode, i.e., the upstream nitrogen and oxygen sensor detection mode or the downstream nitrogen and oxygen sensor detection mode, through the mode selection component 8, depending on whether the interface component 1 is connected to the upstream mating harness connector 41 or the downstream mating harness connector 42.

[0075] Taking the connection of interface component 1 to upstream wiring harness connector 41 by a technician as an example, after selecting the upstream nitrogen oxide sensor detection mode, processor 32 immediately determines whether each signal is in a normal state. When the power signal is normally high, display component 9 outputs and displays the first power detection result: "Upstream power line: normal"; when the power signal is abnormal, it outputs and displays the second power detection result: "Upstream power line: abnormal"; when the ground signal is normally low, it outputs and displays the first ground detection result: "Upstream ground line: normal"; when the ground signal is abnormally high, it outputs and displays the second ground detection result: "Upstream ground line: abnormal"; when the address signal is normally low, it outputs and displays the first address detection result: "Upstream address: normal"; when the address signal is abnormally low or no address signal is detected, it outputs and displays the second address detection result: "Upstream address: abnormal"; when processor 32 successfully communicates with engine control unit 5, it outputs and displays the first communication detection result: "CAN communication: normal"; when processor 32 fails to communicate with engine control unit 5, it outputs and displays the second communication detection result: "CAN communication: abnormal".

[0076] In one embodiment, the fault diagnosis device further includes a power supply component. The power supply component is connected to the signal acquisition component 2, the signal detection component 3, the communication component 7, the display component 8, and the mode selection component 9, respectively, and is used to supply power to the signal acquisition component 2, the signal detection component 3, the communication component 7, the display component 8, and the mode selection component 9, thereby driving each component to work.

[0077] In one embodiment, this application also provides a fault detection system, which includes a wiring harness connector, an engine control unit, a power supply, and a fault detection device according to any of the above embodiments. The engine control unit is connected to the wiring harness connector and communicates with the fault detection device via the wiring harness connector. The power supply is connected to both the engine control unit and the wiring harness connector, and provides a power signal and a ground signal to the wiring harness connector.

[0078] Specifically, the engine control unit 5 is connected to the wiring harness connector 4 via the power signal line, ground signal line, and CAN signal line of the wiring harness connector 4. The power signal line and ground signal line of the wiring harness connector 4 are also connected to the positive and negative terminals of the power supply 6, respectively. When the wiring harness connector 4 is the upstream wiring harness connector 41, the address switch signal line of the upstream wiring harness connector 41 is connected to the negative terminal of the power supply 6. When the wiring harness connector 4 is the downstream wiring harness connector 42, the address switch signal line of the downstream wiring harness connector 42 is left floating, that is, the address switch signal line of the downstream wiring harness connector 42 is not connected to any device. Therefore, when the technician selects the downstream nitrogen oxide sensor detection mode as the target operating mode of the fault detection device, the processor 32, if it does not receive an address signal, outputs and displays the first address detection result: "Downstream address: Normal"; if the processor 32 receives an address signal, it outputs and displays the second address detection result: "Downstream address: Abnormal".

[0079] In one embodiment, such as Figure 8 As shown, this application also provides a fault detection method applied to the fault detection system of the above embodiments, the method including steps S801 to S802:

[0080] S801: Acquire the detection signal of the wiring harness connector, wherein the detection signal includes a power signal, a ground signal, an address signal, a first sub-signal and a second sub-signal.

[0081] The interface component 1 is detachably connected to the wire harness connector 4 to transmit the power signal, ground signal, address signal, first sub-signal and second sub-signal of the wire harness connector 4.

[0082] S802: In the target operating mode, determine whether the wiring harness connector is faulty based on threshold data and power signal, ground signal, address signal, first sub-signal, and second sub-signal. The target operating mode includes one of the upstream nitrogen and oxygen sensor detection mode and the downstream nitrogen and oxygen sensor detection mode.

[0083] When the nitrogen oxide signal is normal, the nitrogen oxide sensor is normally connected to the wiring harness connector 4, measuring the nitrogen oxide concentration in the exhaust gas and feeding it back to the engine control unit 5 in real time through the wiring harness connector 4. The engine control unit 5 then implements closed-loop control of the nitrogen oxide concentration based on the received information. When the nitrogen oxide signal is abnormal, the upstream or downstream nitrogen oxide sensor can be disconnected from the wiring harness connector 4. Depending on the specific requirements, the fault detection device of this application can be connected to the upstream wiring harness connector 41 corresponding to the upstream nitrogen oxide sensor or the downstream wiring harness connector 42 corresponding to the downstream nitrogen oxide sensor. When the fault detection device is connected to the upstream wiring harness connector, the target operating mode is the upstream nitrogen oxide sensor detection mode; when the fault detection device is connected to the downstream wiring harness connector, the target operating mode is the downstream nitrogen oxide sensor detection mode.

[0084] After the fault detection device is connected to the wiring harness connector 4, the interface component 1 can receive power signals, ground signals, and address signals through the pins of the wiring harness connector 4. The power signal is the signal on the power signal line of the wiring harness connector 4, the ground signal is the signal on the ground signal line of the wiring harness connector 4, and the address signal is the signal on the address switch signal line of the wiring harness connector 4. After the interface component 1 receives the power signal, ground signal, and the first and second sub-signals of the address signal through the pins of the wiring harness connector 4, it can send the received power signal, ground signal, and address signal to the signal detection component 3 through the signal acquisition component 2, and send the first and second sub-signals to the signal detection component 3 through the communication component 7. The signal detection component 3 can then determine whether there is a fault in the wiring harness connector 4 based on threshold data and the received power signal, ground signal, address signal, first sub-signal, and second sub-signal in the target operating mode.

[0085] The aforementioned fault detection method involves a detachable interface component that connects to the wiring harness connector and is linked to a signal acquisition component. After receiving the power signal, ground signal, and address signal from the wiring harness connector, the method transmits these signals to the signal detection component. The signal detection component can then determine whether a fault exists in the wiring harness connector based on threshold data and the received power, ground, and address signals, according to the corresponding target operating mode, such as the upstream or downstream nitrogen / oxygen sensor detection mode. The fault detection device, system, and method of this application enable the detection of nitrogen / oxygen signal faults not caused by the nitrogen / oxygen sensor itself, without relying on a multimeter or manual judgment, thus improving detection efficiency and accuracy.

[0086] In one embodiment, such as Figure 9As shown, step S802, in the target working mode, determines whether the wiring harness connector is faulty based on threshold data and power signal, ground signal and address signal, including steps S901 to S905.

[0087] S901: When the power signal is high, the power signal is considered normal.

[0088] S902: When the grounding signal is at a low level, the grounding signal is considered normal.

[0089] S903: When the target operating mode is the upstream nitrogen and oxygen sensor detection mode and the address signal is low, the address signal is judged to be normal.

[0090] S904: When the target operating mode is the downstream nitrogen and oxygen sensor detection mode and the address signal is floating, the address signal is judged to be normal.

[0091] S905: If communication with the engine control unit is successful, determine that the first sub-signal and the second sub-signal are normal.

[0092] Both the power signal line and ground signal line of the upstream wiring harness connector 41 and the downstream wiring harness connector 42 are connected to the positive and negative terminals of the power supply 6, respectively. Therefore, under normal circumstances, the power signal should be high and the ground signal should be low. Since the address switch signal line of the upstream wiring harness connector 41 is connected to the negative terminal of the power supply, and the address switch signal line of the downstream wiring harness connector 42 is floating, the address signal of the upstream wiring harness connector 41 should be low under normal circumstances. The interface component will not receive the address signal of the downstream wiring harness connector 42 under normal circumstances, and consequently, the signal acquisition component 2 and the processor 32 will also not receive the address signal of the downstream wiring harness connector 42. Furthermore, both the CAN_High and CAN_Low signal lines of the upstream and downstream wiring harness connectors 41 and 42 are connected to the engine control unit 5, respectively. When the first and second sub-signals are normal, the processor 32 and the engine control unit 5 can successfully communicate.

[0093] In one embodiment, such as Figure 10 As shown, troubleshooting methods also include:

[0094] S1001: When the power signal is normal, output and display the first power detection result. When the power signal is abnormal, output and display the second power detection result.

[0095] S1002: When the grounding signal is normal, output and display the first grounding detection result. When the grounding signal is abnormal, output and display the second grounding detection result.

[0096] S1003: When the address signal is normal, output and display the first address detection result. When the address signal is abnormal, output and display the second address detection result.

[0097] S1004: If the first and second sub-signals are normal, output and display the first communication detection result. If the first and second sub-signals are abnormal, output and display the second communication detection result.

[0098] Taking the connection of interface component 1 to upstream wiring harness connector 41 by a technician as an example, after selecting the upstream nitrogen oxide sensor detection mode, processor 32 immediately determines whether each signal is in a normal state. When the power signal is normally high, display component 8 outputs and displays the first power detection result: "Upstream power line: normal"; when the power signal is abnormal, it outputs and displays the second power detection result: "Upstream power line: abnormal"; when the ground signal is normally low, it outputs and displays the first ground detection result: "Upstream ground line: normal"; when the ground signal is abnormal, it outputs and displays the second ground detection result: "Upstream ground line: abnormal"; when the address signal is normally low, it outputs and displays the first address detection result: "Upstream address: normal"; when the address signal is abnormally low or no address signal is detected, it outputs and displays the second address detection result: "Upstream address: abnormal"; when processor 32 successfully communicates with engine control unit 5, it outputs and displays the first communication detection result: "CAN communication: normal"; when processor 32 fails to communicate with engine control unit 5, it outputs and displays the second communication detection result: "CAN communication: abnormal".

[0099] Taking the example of a technician connecting interface component 1 to downstream wiring harness connector 42, when the technician selects the downstream nitrogen oxide sensor detection mode as the target operating mode of the fault detection device, if the processor 32 does not receive an address signal, the display component outputs and displays the first address detection result: "Downstream Address: Normal"; if the processor 32 receives an address signal, it outputs and displays the second address detection result: "Downstream Address: Abnormal". When the power signal is normally high, the display component 8 outputs and displays the first power detection result: "Downstream Power Line: Normal"; when the power signal is abnormal, it outputs and displays the second power detection result: "Downstream Power Line: Abnormal"; when the ground signal is normally low, it outputs and displays the first ground detection result: "Downstream Ground Line: Normal"; when the ground signal is abnormal, it outputs and displays the second ground detection result: "Downstream Ground Line: Abnormal"; when the processor 32 successfully communicates with the engine control unit 5, it outputs and displays the first communication detection result: "CAN Communication: Normal"; when the processor 32 fails to communicate with the engine control unit 5, it outputs and displays the second communication detection result: "CAN Communication: Abnormal".

[0100] It should be understood that, although Figures 8-10 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figures 8-10 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0101] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0102] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A fault detection device, characterized in that, The fault detection device includes: An interface component for detachably connecting to a wiring harness connector for transmitting the test signal of the wiring harness connector; A signal acquisition component, connected to the interface component, is used to acquire the power signal, ground signal, and address signal from the signal to be detected. A signal detection component, connected to the signal acquisition component, is used to determine whether the wiring harness connector is faulty based on threshold data and the received power signal, ground signal, and address signal under a target operating mode; wherein, the target operating mode includes one of an upstream nitrogen and oxygen sensor detection mode and a downstream nitrogen and oxygen sensor detection mode; A mode selection component, connected to the signal detection component, is used to receive user operation instructions and determine the target operating mode of the signal detection component according to the operation instructions; wherein, the address threshold in the threshold data is different depending on the target operating mode.

2. The fault detection device according to claim 1, characterized in that, The fault detection device further includes: A communication component is connected to the interface component and the signal detection component respectively, and is used to receive multiple communication signals from the wiring harness connector via the interface component; The signal detection component is connected to the communication component and is used to receive multiple communication signals and determine whether the communication function of the wiring harness connector is faulty based on the multiple communication signals.

3. The fault detection device according to claim 2, characterized in that, The interface component includes: The power pin is connected to the wiring harness connector and is used to transmit the power signal; The grounding pin is connected to the wiring harness connector and is used to transmit the grounding signal; The address switch pin is connected to the wiring harness connector and is used to transmit the address signal; The first communication pin is connected to the wiring harness connector and is used to transmit the first sub-signal among the multiple communication signals. The second communication pin is connected to the mating harness connector and is used to transmit the second sub-signal among the multiple communication signals.

4. The fault detection device according to claim 3, characterized in that, The signal detection component includes: An analog-to-digital converter, connected to the signal acquisition component, is used to convert the analog power signal, the ground signal and the address signal into digital power signals, digital ground signals and digital address signals, respectively. The processor is connected to the analog-to-digital converter and the communication component, respectively, and is used to detect whether the wiring harness connector is in a normal state based on the threshold data, the digital power signal, the digital ground signal, the digital address signal, the first sub-signal and the second sub-signal.

5. The fault detection device according to claim 1, characterized in that, The fault diagnosis device also includes: A display component, connected to the signal detection component, is used to display the detection results of the signal detection component.

6. A fault detection system, characterized in that, include: The system includes a wiring harness connector, an engine control unit, a power supply, and a fault detection device as described in any one of claims 1-5, wherein the engine control unit is connected to the wiring harness connector and communicates with the fault detection device via the wiring harness connector. The power supply is connected to the engine control unit and the wiring harness connector respectively, and provides power and ground signals to the wiring harness connector.

7. A fault detection method, characterized in that, Applied to the fault detection system as described in claim 6, the method includes: Acquire the detection signal of the wiring harness connector, wherein the detection signal includes a power signal, a ground signal, an address signal, a first sub-signal and a second sub-signal; In the target operating mode, the fault status of the wiring harness connector is determined based on threshold data and the power signal, the ground signal, the address signal, the first sub-signal, and the second sub-signal. The target operating mode includes one of the upstream nitrogen and oxygen sensor detection mode and the downstream nitrogen and oxygen sensor detection mode.

8. The fault detection method according to claim 7, characterized in that, Determining whether the wiring harness connector is faulty based on threshold data, the power signal, the ground signal, and the address signal in the target operating mode includes: If the power signal is at a high level, it is determined that the power signal is normal. If the grounding signal is at a low level, it is determined that the grounding signal is normal. If the target operating mode is the upstream nitrogen and oxygen sensor detection mode and the address signal is low, then the address signal is determined to be normal. If the target operating mode is the downstream nitrogen and oxygen sensor detection mode and the address signal is floating, then the address signal is determined to be normal. If communication with the engine control unit is successful, the first sub-signal and the second sub-signal are determined to be normal.

9. The fault detection method according to claim 7, characterized in that, The troubleshooting method also includes: When the power signal is normal, the first power detection result is output and displayed; when the power signal is abnormal, the second power detection result is output and displayed. If the grounding signal is normal, output and display the first grounding detection result; if the grounding signal is abnormal, output and display the second grounding detection result. If the address signal is normal, output and display the first address detection result; if the address signal is abnormal, output and display the second address detection result. If the first sub-signal and the second sub-signal are normal, output and display the first communication detection result; if the first sub-signal and the second sub-signal are abnormal, output and display the second communication detection result.

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