Sensor signal fault diagnosis device and method

Abstract

The invention provides a sensor signal fault diagnosis device and method, and relates to the technical field of sensor diagnosis. The sensor signal fault diagnosis device comprises a signal acquisition module which is used for acquiring target signals, and the target signals at least comprise an output signal of a target temperature sensor, an environment temperature signal and an output signal of a target connector; the diagnosis module is electrically connected with the signal acquisition module, the diagnosis module is used for generating a diagnosis result based on the target signal, and the diagnosis module has a first diagnosis mode and a second diagnosis mode; when the diagnosis module is in the first diagnosis mode, a first diagnosis result can be generated, and the first diagnosis result comprises sensor normality and fault; and when the diagnosis module is in the second diagnosis mode, a second diagnosis result can be generated, and the second diagnosis result comprises normality and fault of the sensor signal transmission line. According to the scheme, automatic diagnosis of sensor signal faults can be achieved, time is saved, and efficiency and customer satisfaction are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor diagnosis, and in particular to a sensor signal fault diagnosis device and method. Background Art

[0002] In the field of commercial vehicles, temperature sensors play a vital role and are key components for improving vehicle performance, safety, reliability and passenger comfort. They are involved in the operation of multiple systems such as motor control systems, electronic and electrical systems, engine cooling systems, and post-treatment emission systems, and play an indispensable role in ensuring the safe and efficient operation of vehicles. However, with the increasing number of temperature sensors involved in vehicle systems, their failure rate will inevitably follow the trend of increasing, resulting in increased pressure on vehicle maintenance. When a vehicle reports a temperature sensor-related fault, maintenance service personnel not only need to diagnose the sensor's own fault, but also need to inspect its signal transmission line. The current mainstream maintenance method is still manual testing using simple tools such as multimeters, and there are certain requirements for maintenance personnel's electronic and electrical expertise. Service stations are required to train maintenance personnel on fault repair services, which is time-consuming and labor-intensive.

[0003] Currently, no effective solution has been proposed for the above-mentioned technical problems. Summary of the invention

[0004] The main purpose of the present invention is to provide a sensor signal fault diagnosis device and method to solve the problem that vehicle temperature sensor diagnosis is time-consuming and labor-intensive in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a sensor signal fault diagnosis device is provided, comprising: a signal acquisition module, the signal acquisition module is used to acquire a target signal, the target signal at least includes an output signal of a target temperature sensor, an ambient temperature signal, and an output signal of a target connector, wherein the target temperature sensor is connected to a vehicle wiring harness through a target connector, and transmits signals to vehicle equipment through the vehicle wiring harness; a diagnosis module, the diagnosis module is electrically connected to the signal acquisition module, the diagnosis module is used to generate a diagnosis result based on the target signal, wherein the diagnosis module has a first diagnosis mode and a second diagnosis mode; when the diagnosis module is in the first diagnosis mode, the diagnosis module is used to generate a first diagnosis result in the diagnosis result based on the output signal of the target temperature sensor and the ambient temperature signal, the first diagnosis result at least includes a normal sensor and a faulty sensor; when the diagnosis module is in the second diagnosis mode, the diagnosis module is used to generate a second diagnosis result in the diagnosis result based on the output signal of the target connector, the second diagnosis result at least includes a normal sensor signal transmission line and a faulty sensor signal transmission line.

[0006] Furthermore, the sensor failure includes at least one of the following: an internal resistor open circuit, an internal resistor short circuit, and an abnormal internal resistor value.

[0007] Furthermore, the sensor signal transmission line fault includes at least one of the following: a signal line open circuit, a signal line short circuit, a ground line open circuit, and a ground line short circuit.

[0008] Furthermore, the signal acquisition module includes: an interface component, the interface component includes a first interface and a second interface, the first interface is used to connect to a target temperature sensor, and the second interface is used to connect to a target connector; a signal acquisition component, the signal acquisition component is electrically connected to the interface component and the diagnostic module, and the signal acquisition component is used to acquire an output signal of the target connector and an output signal of the target temperature sensor; a temperature sensor component, the temperature sensor component is electrically connected to the diagnostic module, and the temperature sensor component is used to detect the ambient temperature and generate an ambient temperature signal.

[0009] Furthermore, the sensor signal fault diagnosis device also includes: a display component, the display component is electrically connected to the diagnosis module, and the display component is used to display the diagnosis result.

[0010] Furthermore, the sensor signal fault diagnosis device also includes: a voltage conversion component, the input end of the voltage conversion component is connected to the external power supply, and the output end of the voltage conversion component is connected to at least one of the display component and the temperature sensor component.

[0011] Furthermore, the sensor signal fault diagnosis device also includes: a function selection component, which is used to receive a diagnosis mode signal and control the diagnosis module to enter the first diagnosis mode and the second diagnosis mode based on the diagnosis mode signal.

[0012] Furthermore, the target temperature sensor is a resistance temperature sensor.

[0013] Furthermore, the signal acquisition component is used to convert the collected output signal of the target connector and the output signal of the target temperature sensor into an analog voltage signal, the temperature sensing component is used to collect the ambient temperature and convert it into an analog voltage signal, and the diagnostic module includes: an analog-to-digital converter, the analog-to-digital converter is electrically connected to the signal acquisition component and the temperature sensing component, the analog-to-digital converter is used to convert the received analog voltage signal into a digital signal; and a diagnostic unit, the diagnostic unit is used to generate a first diagnostic result and a second diagnostic result based on the digital signal output by the analog-to-digital converter.

[0014] According to another aspect of the present invention, a sensor signal fault diagnosis method is provided. The method is based on the above-mentioned sensor signal fault diagnosis device and includes the following steps: obtaining diagnostic mode information, the diagnostic mode information at least includes a target diagnostic mode, and the target diagnostic mode includes at least a first diagnostic mode and a second diagnostic mode; based on the diagnostic mode information, connecting the interface component to a target detection object and obtaining a target signal corresponding to the target diagnostic mode, the target detection object includes a target temperature sensor and a target connector; and generating a diagnostic result based on the target signal.

[0015] By applying the technical solution of the present invention, the output signals of the target temperature sensor to be detected and the ambient temperature are collected by a high-precision signal acquisition module, and then the difference between the target temperature sensor and the ambient temperature can be more accurately used to determine whether the target temperature sensor has an internal fault. The acquisition module can also collect the output signal of the target connector. Since the target connector transmits signals to the vehicle equipment through the vehicle wiring harness, the output signal of the vehicle wiring harness matched with the temperature sensor can be collected, and then it can be determined whether the temperature sensor signal transmission line has a fault. The diagnosis module has two diagnostic modes, the first diagnostic mode and the second diagnostic mode. The first diagnostic mode and the second diagnostic mode correspond to the detection and diagnosis of the target temperature sensor and the temperature sensor signal transmission line, respectively. The diagnosis module can perform separate detection of the target temperature sensor and the temperature sensor signal transmission line by switching the diagnostic mode. The diagnosis module processes the signal of the target to be diagnosed collected by the acquisition module to obtain the corresponding diagnosis result, and automatically outputs and presents the diagnosis result, which can replace the detection work of the target temperature sensor or the temperature sensor signal transmission line by traditional tools such as a multimeter in the prior art, greatly improve the efficiency of troubleshooting the sensor signal transmission line, and reduce the sensor fault misjudgment rate, realize one-key diagnosis, and improve customer satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram showing the principle of an embodiment of a sensor signal fault diagnosis device according to the present invention is shown;

[0018] Figure 2 A schematic diagram showing a principle of an embodiment of a first diagnosis mode of a sensor signal fault diagnosis device according to the present invention;

[0019] Figure 3 A schematic diagram showing a principle of an embodiment of a second diagnosis mode of a sensor signal fault diagnosis device according to the present invention;

[0020] Figure 4 A schematic flow chart of an embodiment of a sensor signal fault diagnosis method according to the present invention is shown.

[0021] The above drawings include the following reference numerals:

[0022] 1. Signal acquisition module; 11. Interface component; 12. Signal acquisition component; 13. Temperature sensor component;

[0023] 2. Target temperature sensor; 21. First pin; 22. Second pin;

[0024] 3. Target connector; 31. Third pin; 32. Fourth pin;

[0025] 4. Vehicle wiring harness;

[0026] 5. Complete vehicle equipment; 51. Signal pin; 52. Ground pin;

[0027] 6. Diagnostic module; 61. Analog-to-digital converter;

[0028] 7. Display components;

[0029] 8. Voltage conversion component; 81. External power supply;

[0030] 9. Function selection component. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0035] Combination Figures 1 to 3 As shown, according to a specific embodiment of the present application, a sensor signal fault diagnosis device is provided.

[0036] Specifically, Figure 2 , Figure 3 As shown, the sensor signal fault diagnosis device includes a signal acquisition module 1 and a diagnosis module 6, the signal acquisition module 1 is used to collect target signals, the target signals at least include the output signal of the target temperature sensor 2, the ambient temperature signal, and the output signal of the target connector 3, wherein the target temperature sensor 2 is connected to the vehicle wiring harness 4 through the target connector 3, and transmits signals to the vehicle equipment 5 through the vehicle wiring harness 4; the diagnosis module 6 is electrically connected to the signal acquisition module 1, and the diagnosis module 6 is used to generate a diagnosis result based on the target signal, wherein the diagnosis module 6 has a first diagnosis mode and a second diagnosis mode; when the diagnosis module 6 is in the first diagnosis mode, the diagnosis module 6 is used to generate a first diagnosis result in the diagnosis result based on the output signal of the target temperature sensor 2 and the ambient temperature signal, and the first diagnosis result at least includes a normal sensor and a sensor fault; when the diagnosis module 6 is in the second diagnosis mode, the diagnosis module 6 is used to generate a second diagnosis result in the diagnosis result based on the output signal of the target connector 3, and the second diagnosis result at least includes a normal sensor signal transmission line and a sensor signal transmission line fault.

[0037] By applying the technical solution of this embodiment, the output signals of the target temperature sensor 2 to be detected and the ambient temperature are collected by a high-precision signal acquisition module 1, so that it can be more accurately determined whether the target temperature sensor 2 has an internal fault through the difference between the target temperature sensor 2 and the ambient temperature. The signal acquisition module 1 can also collect the output signal of the target connector 3. Since the target connector 3 transmits signals to the vehicle equipment 5 through the vehicle wiring harness 4, the output signal of the vehicle wiring harness 4 matched with the temperature sensor can be collected, so as to determine whether the temperature sensor signal transmission line has a fault. The diagnostic module 6 has two diagnostic modes, a first diagnostic mode and a second diagnostic mode. The first diagnostic mode The first diagnostic mode and the second diagnostic mode respectively correspond to the detection and diagnosis of the target temperature sensor 2 and the temperature sensor signal transmission line. The diagnostic module 6 can perform separate detections on the target temperature sensor 2 and the temperature sensor signal transmission line by switching the diagnostic mode. The diagnostic module 6 processes the signal of the target to be diagnosed collected by the signal acquisition module 1, obtains the corresponding diagnostic result, and automatically outputs and presents the diagnostic result, which can replace the manual detection of the target temperature sensor 2 or the temperature sensor signal transmission line by traditional tools such as multimeters in the prior art, greatly improves the efficiency of troubleshooting the sensor signal transmission line, reduces the misjudgment rate of sensor faults, realizes one-click diagnosis, and improves customer satisfaction.

[0038] It should be noted that the diagnostic module 6 is a central processing unit CPU, which has signal conversion, signal processing and storage functions. When the diagnostic module 6 is in the first diagnostic mode, the diagnostic module 6 compares the output signal of the target temperature sensor 2 with the ambient temperature signal, and determines whether the target temperature sensor 2 can accurately output the correct temperature signal through the difference between the two, thereby realizing the first diagnostic result of the target temperature sensor 2; when the diagnostic module 6 is in the second diagnostic mode, the diagnostic module 6 compares the output signal of the target connector 3 with the signal data stored in the diagnostic module 6, and determines whether the target connector 3 can output the correct signal through the difference between the two, thereby realizing the second diagnostic result of the temperature sensor signal transmission line.

[0039] Specifically, the sensor failure includes at least one of the following: internal resistor disconnection, internal resistor short circuit, and abnormal internal resistance value. By comparing the collected output signal of the target temperature sensor 2 with the output signal of the ambient temperature sensor, it is determined whether the target temperature sensor 2 has a fault, specifically, there is a resistor disconnection, a resistor short circuit, or a resistor drift (the resistance value deviates from the original resistance value, and is abnormally low or high) inside the target temperature sensor 2.

[0040] Specifically, the sensor signal transmission line fault includes at least one of the following: signal line break, signal line short circuit, ground line break, and ground line short circuit. By comparing the collected output signal of the target connector 3 with the signal data stored in the diagnostic module 6, it is determined whether the temperature sensor signal transmission line has a fault, specifically, signal transmission line break, signal transmission line break, ground line break, and ground line short circuit. The diagnostic module 6 presents or feeds back the above-mentioned specific fault mode or non-fault mode to the staff in the form of diagnostic results, so as to achieve the effect of automatically detecting faults by the device and saving manpower and time.

[0041] Furthermore, if Figure 1 As shown, the signal acquisition module 1 includes an interface component 11, a signal acquisition component 12 and a temperature sensor component 13. The interface component 11 includes a first interface and a second interface. The first interface is used to connect to the target temperature sensor 2, and the second interface is used to connect to the target connector 3. The signal acquisition component 12 is electrically connected to the interface component 11 and the diagnostic module 6. The signal acquisition component 12 is used to collect the output signal of the target connector 3 and the output signal of the target temperature sensor 2. The temperature sensor component 13 is electrically connected to the diagnostic module 6. The temperature sensor component 13 is used to detect the ambient temperature and generate an ambient temperature signal. The signal acquisition component 12 is arranged between the diagnostic module 6 and the interface component 11. The signal acquisition component 12 collects the signals output by the target temperature sensor 2 and the target connector 3 through the interface component 11 and transmits them to the diagnostic module 6. When the interface component 11 is connected to the target temperature sensor 2 through the first interface, the temperature sensing component 13 also transmits the detected ambient temperature signal to the diagnostic module 6 to assist the diagnostic module 6 in making a diagnostic result. When the interface component 11 is connected to the target connector 3 through the second interface, the diagnostic module 6 can make a diagnostic result only through the output signal output by the temperature sensor signal transmission line and the data signal stored in itself.

[0042] Specifically, Figures 1 to 3 As shown, the sensor signal fault diagnosis device also includes a display component 7, which is electrically connected to the diagnosis module 6, and the display component 7 is used to display the diagnosis result. The first diagnosis result of the diagnosis module 6 includes the normal and faulty state of the target temperature sensor 2, and the fault is further divided into short circuit, open circuit and abnormally high / low resistance value of the target temperature sensor 2; the second diagnosis result of the diagnosis module 6 includes the normal and faulty state of the temperature sensor signal transmission line, and the fault is further divided into signal line open circuit, signal line short circuit, ground line open circuit and ground line short circuit. The display component 7 can specifically display and feedback a variety of diagnosis results to the staff, directly feedback the cause of the fault, and reduce the misjudgment rate of human judgment.

[0043] In one embodiment of the present application, the display component 7 can use a liquid crystal display. The display component 7 serves as an overall automated and intelligent display window for the sensor signal fault diagnosis device. It is not only used to display the diagnosis results. That is, in addition to being used to display the diagnosis results made by the diagnosis module 6 in the above-mentioned embodiment, the display component 7 can also be used to display the overall start and stop of the display device, usage status, power connection status, and diagnosis mode selection status of the diagnosis module 6.

[0044] Furthermore, if Figure 2 , Figure 3 As shown, the sensor signal fault diagnosis device further includes a voltage conversion component 8, the input end of the voltage conversion component 8 is connected to an external power supply 81, and the output end of the voltage conversion component 8 is connected to at least one of the display component 7 and the temperature sensor component 13. The external power supply 81 is a 220V AC power supply in daily life. The external power supply 81 is connected to the voltage conversion component 8, and the voltage conversion component 8 converts the external power supply 81 into a voltage suitable for the fault diagnosis device, and provides power to components such as the display component 7 and the temperature sensor component 13.

[0045] Furthermore, if Figures 1 to 3 As shown, the sensor signal fault diagnosis device further includes a function selection component 9, which is used to receive a diagnostic mode signal and control the diagnostic module 6 to enter the first diagnostic mode and the second diagnostic mode based on the diagnostic mode signal. The diagnostic mode signal is a control signal provided manually. After receiving the diagnostic mode signal, the function selection component 9 can transmit it to the diagnostic module 6. After the processor in the diagnostic module 6 receives and judges the diagnostic mode signal, it processes it into the corresponding first diagnostic module or second diagnostic mode, that is, the diagnostic mode of the fault diagnosis device is adjusted by manually controlling the function selection component 9, and the operation is simple and convenient.

[0046] Optionally, the target temperature sensor 2 is a resistor-type temperature sensor. For example, the target temperature sensor 2 is a temperature sensor such as a thermistor or a metal resistor. Such sensors are sensitive to temperature changes, and the resistance of the resistor changes accordingly with the temperature change, resulting in a change in the current output in the circuit in which the sensor is located. The signal acquisition component 12 can collect and record the current change in the circuit, and then transmit the data information to the processor to perform fault diagnosis and judgment.

[0047] In this embodiment, the temperature sensing component 13 may also adopt a resistance temperature sensor, that is, it provides an output signal of the temperature change of the control group under normal working conditions. The processor can compare the real-time status of the temperature sensing component 13 with that of the target temperature sensor 2 to determine whether the target temperature sensor 2 is faulty and make a diagnosis result.

[0048] Further, the signal acquisition component 12 is used to convert the collected output signal of the target connector 3 and the output signal of the target temperature sensor 2 into an analog voltage signal, the temperature sensor component 13 is used to collect the ambient temperature and convert it into an analog voltage signal, the diagnosis module 6 includes an analog-to-digital converter 61 and a diagnosis unit, the analog-to-digital converter 61 is electrically connected to the signal acquisition component 12 and the temperature sensor component 13, and the analog-to-digital converter 61 is used to convert the received analog voltage signal into a digital signal; the diagnosis unit is used to generate a first diagnosis result and a second diagnosis result based on the digital signal output by the analog-to-digital converter 61. The analog voltage signal is relatively common, simple, easy to measure and understand, so the output signal of the target connector 3, the output signal of the target temperature sensor 2 and the ambient temperature collected by the temperature sensor component 13 are converted into the form of analog voltage signals to more accurately obtain the target signal to be measured. On this basis, by setting the analog-to-digital converter 61 to convert each analog voltage signal into a digital signal, it is convenient for the processor to store and transmit data, improve data compatibility and integration, and also easy to realize the automation and intelligence of signal control, that is, to realize the intelligence of diagnosis results and result display.

[0049] According to another specific embodiment of the present application, a sensor signal fault diagnosis method is also provided. The method is performed based on the sensor signal fault diagnosis device in the above-mentioned embodiment, and the method includes the following steps: obtaining diagnostic mode information, the diagnostic mode information at least includes a target diagnostic mode, and the target diagnostic mode includes at least a first diagnostic mode and a second diagnostic mode; based on the diagnostic mode information, connecting the interface component 11 to a target detection object, and obtaining a target signal corresponding to the target diagnostic mode, the target detection object includes a target temperature sensor 2 and a target connector 3; based on the target signal, generating a diagnostic result.

[0050] By applying the technical solution of this embodiment, the diagnostic mode information is obtained, and the diagnostic mode information includes at least the target diagnostic mode, and the target diagnostic mode includes at least the first diagnostic mode and the second diagnostic mode; based on the diagnostic mode information, the interface component 11 is connected to the target detection object, and the target signal corresponding to the target diagnostic mode is obtained, and the target detection object includes the target temperature sensor 2 and the target connector 3; based on the target signal, a diagnostic result is generated. Through this method, only the interface component 11 needs to be connected to the target detection object, and the first diagnostic mode or the second diagnostic mode is manually selected. After the power is turned on, the target detection object can be automatically detected, which can greatly save maintenance time, improve maintenance efficiency, and improve user experience.

[0051] The sensor signal fault diagnosis device and method in the above embodiment can produce the following beneficial effects:

[0052] 1) The sensor signal fault diagnosis device is equipped with a high-precision temperature sensor component 13 to collect ambient temperature in real time. The processor can more accurately determine whether the internal resistance value of the target temperature sensor 2 is abnormally high / low by comparing the collected output signal of the target temperature sensor 2 with the ambient temperature signal of the temperature sensor component 13. Machine action is used instead of previous manual judgment, thereby effectively reducing the fault misjudgment rate of the target temperature sensor 2.

[0053] 2) The sensor signal fault diagnosis device can also be connected to the target connector 3 of the vehicle wiring harness 4 matched with the temperature sensor, and the processor can further determine whether there is a fault in the temperature sensor signal transmission line according to the entered diagnostic logic, thereby realizing the diagnosis and troubleshooting of the vehicle signal fault caused by non-temperature sensor faults itself, replacing the maintenance service personnel using traditional tools such as multimeters to perform the work of detecting the two vehicle signal transmission lines separately, thereby greatly saving troubleshooting time.

[0054] 3) The sensor signal fault diagnosis device adopts an integrated detection device, which can not only realize the functions of two diagnostic modes through the diagnosis module 6, but also display the specific results of the detection and diagnosis through the display component 7. The maintenance service personnel only need to use the fault diagnosis device to connect the target temperature sensor 2 or the target connector 3 of the vehicle wiring harness 4 to directly obtain the cause of the fault, which can greatly save maintenance time, improve the one-time repair rate, and enhance customer satisfaction, realizing the real "one-click diagnosis".

[0055] The present application also provides a preferred embodiment of a sensor signal fault diagnosis device, and the sensor signal fault diagnosis device according to this embodiment can realize two detection functions: temperature sensor fault detection and vehicle temperature sensor signal transmission line fault monitoring. The process of applying the fault diagnosis is as follows: Figure 4 shown.

[0056] Specifically, Figure 1 As shown, the sensor signal fault diagnosis device is mainly composed of a diagnosis module 6, a temperature sensor component 13, a signal acquisition component 12, an interface component 11, a voltage conversion component 8, a display component 7 and a function selection component 9. The modules and components work together to realize two detection functions: temperature sensor fault detection and vehicle temperature sensor signal transmission line fault monitoring. Among them, the identifiable temperature sensor faults include internal resistance open circuit fault, internal resistance short circuit fault, and internal resistance value drift fault. The identifiable vehicle temperature sensor signal transmission line faults include signal line open circuit, signal line short circuit, ground line short circuit, and ground line open circuit. After the fault diagnosis is completed, the processor of the diagnosis module 6 displays the fault detection result through the display screen of the display component 7.

[0057] Fault detection function for target temperature sensor 2: Figure 2As shown, the sensor signal fault diagnosis device is connected to a 220V external power supply 81 through a voltage conversion component 8. After turning on the power, the user connects the target temperature sensor 2 to the first interface of the corresponding interface component 11, and manually selects the temperature sensor fault detection function through the function selection component 9. After determining the object to be tested, the signal acquisition component 12 converts the resistance value between the first pin 21 and the second pin 22 of the target temperature sensor 2 into an analog voltage signal, and then the analog-to-digital converter 61 in the diagnosis module 6 converts the received analog voltage signal into a digital signal that can be recognized by the processor in the diagnosis module 6. At the same time, the temperature sensor component 13 collects the ambient temperature in real time and converts it into an analog voltage signal , which is then received and converted into a digital signal by the analog-to-digital converter 61 in the diagnosis module 6. Subsequently, the diagnosis module 6 compares the collected target temperature sensor signal and the ambient temperature signal, and further determines whether the single-signature target temperature sensor has an internal resistance open circuit fault, an internal resistance short circuit fault or an internal resistance value offset fault according to the entered sensor progress requirements and the diagnosis band threshold. After the diagnosis module 6 completes the diagnosis action, the liquid crystal display of the drive display component 7 displays the final result as "sensor normal" or "sensor fault-internal resistance open circuit" or "sensor fault-internal resistance short circuit" or "sensor fault-internal resistance value abnormally high" or "sensor fault-internal resistance value abnormally low".

[0058] Fault detection function for vehicle temperature sensor signal transmission line: Figure 3 As shown, the sensor signal fault diagnosis device is connected to a 220V external power supply 81 through a voltage conversion component 8. After turning on the power, the user connects the target connector 3 of the temperature sensor matching the vehicle wiring harness 4 to the second interface of the corresponding interface component 11. The target connector 3 is connected to the vehicle equipment 5 through the vehicle wiring harness 4, and the vehicle temperature sensor signal transmission line fault detection function is manually selected through the function selection component 9. After determining the object to be tested, the signal acquisition component 12 collects the analog voltage signal between the third pin 31 and the fourth pin 32 of the target connector 3 and the signal pin 51 and the ground pin 52 of the vehicle equipment 5 received through the vehicle wiring harness 4, and then the analog-to-digital signal in the diagnosis module 6 is used to detect the temperature sensor signal transmission line fault detection function. The converter 61 converts the received analog voltage signal into a digital signal recognizable by the processor in the diagnostic module 6. Then, the diagnostic module 6 further determines whether there is a signal line short circuit fault, a signal line open circuit fault, a ground wire short circuit fault or a ground wire open circuit fault in the signal transmission line of the temperature sensor measured in the retaining wall according to the entered diagnostic logic. After the diagnostic module 6 completes the diagnostic action, the liquid crystal display of the driving display component 7 displays the final result as "sensor signal transmission line is normal" or "sensor signal transmission line fault-signal line short circuit" or "sensor signal transmission line fault-signal line open circuit" or "sensor signal transmission line fault-ground wire open circuit" or "sensor signal transmission line fault-ground wire short circuit".

[0059] After the above diagnostic work is completed, the user can select the corresponding maintenance work according to the troubleshooting results displayed on the LCD to detect and repair the vehicle temperature sensor signal fault.

[0060] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0061] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0062] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sensor signal fault diagnosis device, characterized in that: include: A signal acquisition module (1), the signal acquisition module (1) being used to acquire a target signal, the target signal comprising at least an output signal of a target temperature sensor (2), an ambient temperature signal, and an output signal of a target connector (3), wherein the target temperature sensor (2) is connected to a vehicle wiring harness (4) via the target connector (3), and performs signal transmission with a vehicle device (5) via the vehicle wiring harness (4); A diagnostic module (6), the diagnostic module (6) being electrically connected to the signal acquisition module (1), the diagnostic module (6) being used to generate a diagnostic result based on the target signal, wherein the diagnostic module (6) has a first diagnostic mode and a second diagnostic mode; When the diagnostic module (6) is in the first diagnostic mode, the diagnostic module (6) is used to generate a first diagnostic result in the diagnostic results based on the output signal of the target temperature sensor (2) and the ambient temperature signal, wherein the first diagnostic result at least includes a normal sensor and a faulty sensor; When the diagnostic module (6) is in the second diagnostic mode, the diagnostic module (6) is used to generate a second diagnostic result in the diagnostic results based on the output signal of the target connector (3), and the second diagnostic result at least includes a normal sensor signal transmission line and a faulty sensor signal transmission line.

2. The sensor signal fault diagnosis device according to claim 1, characterized in that: The sensor failure includes at least one of the following: internal resistance open circuit, internal resistance short circuit, and abnormal internal resistance value.

3. The sensor signal fault diagnosis device according to claim 1, characterized in that: The sensor signal transmission line fault includes at least one of the following: signal line open circuit, signal line short circuit, ground line open circuit, and ground line short circuit.

4. The sensor signal fault diagnosis device according to any one of claims 1 to 3, characterized in that: The signal acquisition module (1) comprises: An interface component (11), the interface component (11) comprising a first interface and a second interface, the first interface being used to connect to the target temperature sensor (2), and the second interface being used to connect to the target connector (3); a signal acquisition component (12), the signal acquisition component (12) being electrically connected to the interface component (11) and the diagnostic module (6), the signal acquisition component (12) being used to acquire an output signal of the target connector (3) and an output signal of the target temperature sensor (2); A temperature sensing component (13), the temperature sensing component (13) is electrically connected to the diagnostic module (6), and the temperature sensing component (13) is used to detect the ambient temperature and generate the ambient temperature signal.

5. The sensor signal fault diagnosis device according to claim 4, characterized in that: The sensor signal fault diagnosis device also includes: A display component (7), the display component (7) is electrically connected to the diagnosis module (6), and the display component (7) is used to display the diagnosis result.

6. The sensor signal fault diagnosis device according to claim 5, characterized in that: The sensor signal fault diagnosis device also includes: A voltage conversion component (8), wherein an input end of the voltage conversion component (8) is connected to an external power source (81), and an output end of the voltage conversion component (8) is connected to at least one of the display component (7) and the temperature sensor component (13).

7. The sensor signal fault diagnosis device according to claim 1, characterized in that: The sensor signal fault diagnosis device also includes: A function selection component (9) is used to receive a diagnostic mode signal and control the diagnostic module (6) to enter the first diagnostic mode and the second diagnostic mode based on the diagnostic mode signal.

8. The sensor signal fault diagnosis device according to claim 1, characterized in that: The target temperature sensor (2) is a resistance temperature sensor.

9. The sensor signal fault diagnosis device according to claim 4, characterized in that: The signal acquisition component (12) is used to convert the collected output signal of the target connector (3) and the output signal of the target temperature sensor (2) into an analog voltage signal, the temperature sensor component (13) is used to collect the ambient temperature and convert it into an analog voltage signal, and the diagnosis module (6) includes: an analog-to-digital converter (61), the analog-to-digital converter (61) being electrically connected to the signal acquisition component (12) and the temperature sensing component (13), and the analog-to-digital converter (61) being used to convert a received analog voltage signal into a digital signal; A diagnostic unit, the diagnostic unit is used to generate the first diagnostic result and the second diagnostic result using the digital signal output by the analog-to-digital converter (61).

10. A sensor signal fault diagnosis method, characterized in that: The method is performed based on the sensor signal fault diagnosis device according to any one of claims 1 to 9, and the method comprises the following steps: Acquire diagnostic mode information, wherein the diagnostic mode information includes at least a target diagnostic mode, and the target diagnostic mode includes at least a first diagnostic mode and a second diagnostic mode; Based on the diagnostic mode information, the interface component (11) is connected to a target detection object, and a target signal corresponding to the target diagnostic mode is obtained, wherein the target detection object includes a target temperature sensor (2) and a target connector (3); Based on the target signal, the diagnosis result is generated.

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