Indication verification device and verification method for automobile instrument

Abstract

The invention provides an indication verification device and verification method for an automobile instrument, and belongs to the technical field of instrument verification. The automobile instrument is fixed to a verification station, a signal acquisition module, a fault injection module and corresponding ports of the instrument are connected, and optical detection equipment is adjusted to be aligned with a display area; and starting the data processing storage module, and loading the preset icon library, the fault strategy and the verification threshold. And collecting and storing an instrument bus, a digital-analog signal, an indicator light reference optical parameter and an icon feature. Injecting a single fault signal and a composite fault signal, collecting a fault state output signal, and judging the matching degree of the signal and a fault type. And comparing the optical parameters in the fault state and the fault-free state with a standard threshold value. And shooting each working condition icon, extracting features, comparing the features with the template, and judging whether the display is qualified or not. And integrating the results to generate a report, marking unqualified items, and storing the data and the report to a local end and a cloud end. According to the invention, comprehensive verification of the automobile instrument is realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of instrument calibration, in particular, the present application relates to a kind of indicating calibration device and calibration method of automobile instrument. BACKGROUND

[0002] With the rapid development of automobile electronics, intelligent, automobile instrument has been upgraded from traditional mechanical pointer type instrument to multifunctional composite instrument integrating pointer display, digital display and icon indication, as the core interactive component for drivers to obtain vehicle operating state and fault information, indication accuracy is directly related to driving safety.

[0003] Chinese patent 101571419A, an automobile instrument LED indicating lamp automatic inspection method using image segmentation, proposes a region growing method based on maximum inter-class variance, automatically selects the centroid of LED light emitting area as seed point for region growing, realizes region segmentation and extraction, and judges whether the brightness and color of the lamp are correct based on the seed point and the area.

[0004] The prior art is not comprehensive enough for the inspection of automobile instrument, and cannot meet the inspection requirements. SUMMARY

[0005] The present application aims to provide an indicating calibration device and calibration method of automobile instrument to achieve the technical purpose of comprehensive calibration of automobile instrument.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] The present application provides an indicating calibration device of automobile instrument, which comprises an automobile instrument, a signal acquisition module, a fault injection module, an optical detection device, an icon calibration module and a data processing and storage module. The signal output port of the automobile instrument is electrically connected with the signal acquisition module, and the signal input port of the automobile instrument is electrically connected with the fault injection module. The optical detection device is arranged corresponding to the display area of the automobile instrument. The signal acquisition module, the fault injection module, the optical detection device and the icon calibration module are respectively communicatively connected with the data processing and storage module. The signal acquisition module is used to acquire various electrical signals output by the automobile instrument. The fault injection module is used to inject preset fault signals to the automobile instrument. The optical detection device is used to detect the optical performance parameters of the indicating lamp of the automobile instrument. The icon calibration module is used to compare the display icons of the automobile instrument. The data processing and storage module is used to process the collected data, control the cooperative work of each module and store the calibration results.

[0008] The signal acquisition module comprises a CAN / LIN interface module, a digital signal acquisition card, an analog signal collector and a signal conditioning unit; the CAN / LIN interface module is connected with the automobile instrument through an OBD-II interface; the digital signal acquisition card is connected with the digital signal output end of the automobile instrument; the analog signal collector is connected with the analog signal output end of the automobile instrument; and the output end of the signal conditioning unit is connected with the data processing and storage module.

[0009] The fault injection module comprises a programmable fault injector, a fault simulation circuit board and a fault control unit; the programmable fault injector is used for generating electrical signals of sensor faults, communication faults and power supply faults and injecting the electrical signals into the automobile instrument; the fault simulation circuit board is used for simulating hardware faults such as short circuit, open circuit and poor contact; and the fault control unit is in communication connection with the data processing and storage module and is used for receiving fault injection instructions.

[0010] The optical detection device comprises a light illuminometer, a colorimetric analyzer, an image acquisition camera and an optical adjustment support; the light illuminometer is used for measuring the brightness of the indicator light of the automobile instrument; the colorimetric analyzer is used for measuring the color coordinates of the indicator light; the image acquisition camera is used for shooting the display icons of the instrument; and the optical adjustment support is used for fixing the optical detection device.

[0011] The icon verification module comprises a preset icon library, an image recognition unit and a comparison and determination unit; the preset icon library stores various icon templates in the design standard of the automobile instrument; the image recognition unit is used for extracting the icon edges, contours and pixel features shot by the image acquisition camera; and the comparison and determination unit is used for comparing the extracted icon features with the templates in the preset icon library and determining whether the icon display conforms to the standard.

[0012] The data processing and storage module comprises a high-performance processor, a local storage unit, a cloud communication module and a data interaction module; the high-performance processor is used for running data processing algorithms to realize signal analysis, optical parameter analysis and icon comparison result integration; the local storage unit is used for storing verification data and results; the cloud communication module is used for uploading the verification data to a cloud server; and the data interaction module is used for data query, traceability and report generation.

[0013] The signal conditioning unit and the data processing and storage module are connected through a shielding wire.

[0014] The present application provides a verification method of an indicator verification device of an automobile instrument, comprising the following steps:

[0015] Step 1: Fix the car instrument panel at the calibration station, connect the signal acquisition module to the signal port of the car instrument panel, and the fault injection module to the input port of the car instrument panel. Adjust the position of the optical testing equipment so that the testing end is aligned with the instrument display area. Start the data processing and storage module and load the preset icon library, fault injection strategy and calibration standard threshold.

[0016] Step 2: The signal acquisition module acquires the bus signals, digital signals and analog signals output by the vehicle instrument panel, the optical detection equipment acquires the reference brightness and color coordinate parameters of the indicator lights, the icon verification module acquires the reference icon features, and the data is stored in the data processing and storage module.

[0017] Step 3: Inject preset fault signals into the vehicle's instrument panel through the fault injection module, including single faults and compound faults; simultaneously, collect the instrument panel output signals under fault conditions through the signal acquisition module, and the data processing and storage module parses the signal data to determine whether the instrument panel signal output matches the fault type;

[0018] Step 4: During the fault injection process and in the fault-free state, the brightness and color coordinate parameters of each indicator light of the instrument are collected multiple times by the optical detection equipment. The data processing and storage module compares the collected data with the reference data and the design standard threshold to determine whether the optical performance is qualified.

[0019] Step 5: Capture the display icons of the instrument under various operating conditions using an image acquisition camera. The icon verification module extracts the icon features and compares them with the preset icon library templates to determine whether the icon display integrity, consistency, and edge jaggedness meet the standards.

[0020] Step Six: The data processing and storage module integrates the results of signal verification, optical performance verification, and icon verification, generates a verification report, and marks non-compliant items; it stores the verification data and report locally and in the cloud, and outputs the verification results.

[0021] The complex faults in step three include combinations of sensor and communication faults, and combinations of power supply and hardware faults.

[0022] The optical inspection in step four must be performed in a darkroom environment.

[0023] The technical effects of this invention are as follows:

[0024] (1) The present invention has comprehensive verification dimensions. Through the signal acquisition module, optical detection equipment and icon verification module, it realizes multi-dimensional verification of instrument signals, optical performance and display content, covering all indication links of the instrument in normal operation and fault state, avoiding the problem of missed detection caused by single-dimensional verification.

[0025] (2) The present invention has high verification accuracy. It adopts high-precision signal acquisition components and optical detection equipment, combined with image recognition algorithms, to ensure the accuracy of verification data; and further improves verification accuracy through benchmark data acquisition and comparison.

[0026] (3) The present invention has a high degree of automation, realizing full automation of fault injection, signal acquisition, optical detection, icon verification and data processing, without the need for manual intervention, reducing the dependence on manual labor, improving verification efficiency, and avoiding misjudgment and missed detection caused by manual visual comparison.

[0027] (4) The fault coverage of the present invention is comprehensive, supporting the injection of single faults and compound faults, covering various fault scenarios such as sensor faults, communication faults, power supply faults, and hardware faults. It can test the indication response of the instrument under complex fault conditions and ensure the reliability of the instrument in actual work.

[0028] (5) The data of the present invention is traceable. By combining local storage and cloud storage, the long-term storage and traceability of verification data and verification reports can be realized, which makes it easier for technicians to analyze the reasons for non-conformities and trace the verification process, and provides data support for the improvement of instrument production. Attached Figure Description

[0029] This manual includes the following figures, which illustrate the following:

[0030] Figure 1 This is a flowchart of an indicator verification device and verification method for an automotive instrument panel according to the present invention. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0032] This invention provides a device for verifying the indication of an automotive instrument panel, comprising an automotive instrument panel, a signal acquisition module, a fault injection module, an optical detection device, an icon verification module, and a data processing and storage module. The signal output port of the automotive instrument panel is electrically connected to the signal acquisition module, and the signal input port of the automotive instrument panel is electrically connected to the fault injection module. The optical detection device is set to correspond to the display area of ​​the automotive instrument panel. The signal acquisition module, fault injection module, optical detection device, and icon verification module are communicatively connected to the data processing and storage module. The signal acquisition module is used to acquire various electrical signals output by the automotive instrument panel, the fault injection module is used to inject preset fault signals into the automotive instrument panel, the optical detection device is used to detect the optical performance parameters of the indicator lights on the automotive instrument panel, the icon verification module is used to compare the icons displayed on the automotive instrument panel, and the data processing and storage module is used to process the acquired data, control the coordinated operation of each module, and store the verification results.

[0033] The signal acquisition module includes a CAN / LIN interface module, a digital signal acquisition card, an analog signal acquisition unit, and a signal conditioning unit. The CAN / LIN interface module connects to the vehicle's instrument cluster via an OBD-II interface. The digital signal acquisition card connects to the digital signal output of the vehicle's instrument cluster. The analog signal acquisition unit connects to the analog signal output of the vehicle's instrument cluster. The output of the signal conditioning unit connects to the data processing and storage module.

[0034] The fault injection module includes a programmable fault injector, a fault simulation circuit board, and a fault control unit. The programmable fault injector generates electrical signals for sensor faults, communication faults, and power supply faults and injects them into the vehicle's instrument panel. The fault simulation circuit board simulates hardware faults such as short circuits, open circuits, and poor contacts. The fault control unit is connected to the data processing and storage module and is used to receive fault injection commands.

[0035] The optical inspection equipment includes a photometer, a colorimeter, an image acquisition camera, and an optical adjustment bracket; the photometer is used to measure the brightness of the indicator lights on the car's instrument panel; the colorimeter is used to measure the color coordinates of the indicator lights; the image acquisition camera is used to photograph the instrument panel display icons; and the optical adjustment bracket is used to fix the optical inspection equipment.

[0036] The icon verification module includes a preset icon library, an image recognition unit, and a comparison and judgment unit. The preset icon library stores various icon templates in the automotive instrument design standard. The image recognition unit is used to extract the edge, outline, and pixel features of the icons captured by the image acquisition camera. The comparison and judgment unit is used to compare the extracted icon features with the templates in the preset icon library to determine whether the icon display conforms to the standard.

[0037] The data processing and storage module includes a high-performance processor, a local storage unit, a cloud communication module, and a data interaction module. The high-performance processor is used to run data processing algorithms to achieve signal analysis, optical parameter analysis, and integration of icon comparison results. The local storage unit is used to store verification data and results, and the cloud communication module is used to upload verification data to the cloud server. The data interaction module is used for data query, traceability, and report generation.

[0038] The signal conditioning unit and the data processing and storage module are connected via shielded cables.

[0039] This invention provides a calibration method for an indicator calibration device of an automotive instrument panel, comprising the following steps:

[0040] Step 1: Fix the car instrument panel at the calibration station, connect the signal acquisition module to the signal port of the car instrument panel, and the fault injection module to the input port of the car instrument panel. Adjust the position of the optical testing equipment so that the testing end is aligned with the instrument display area. Start the data processing and storage module and load the preset icon library, fault injection strategy and calibration standard threshold.

[0041] Step 2: The signal acquisition module acquires the bus signals, digital signals and analog signals output by the vehicle instrument panel, the optical detection equipment acquires the reference brightness and color coordinate parameters of the indicator lights, the icon verification module acquires the reference icon features, and the data is stored in the data processing and storage module.

[0042] Step 3: Inject preset fault signals into the vehicle's instrument panel through the fault injection module, including single faults and compound faults; simultaneously, collect the instrument panel output signals under fault conditions through the signal acquisition module, and the data processing and storage module parses the signal data to determine whether the instrument panel signal output matches the fault type;

[0043] Step 4: During the fault injection process and in the fault-free state, the brightness and color coordinate parameters of each indicator light of the instrument are collected multiple times by the optical detection equipment. The data processing and storage module compares the collected data with the reference data and the design standard threshold to determine whether the optical performance is qualified.

[0044] Step 5: Capture the display icons of the instrument under various operating conditions using an image acquisition camera. The icon verification module extracts the icon features and compares them with the preset icon library templates to determine whether the icon display integrity, consistency, and edge jaggedness meet the standards.

[0045] Step Six: The data processing and storage module integrates the results of signal verification, optical performance verification, and icon verification, generates a verification report, and marks non-compliant items; it stores the verification data and report locally and in the cloud, and outputs the verification results.

[0046] The complex faults in step three include combinations of sensor and communication faults, and combinations of power supply and hardware faults.

[0047] The optical inspection in step four must be performed in a darkroom environment.

[0048] The present invention will now be described in detail.

[0049] In this embodiment of the invention, the automotive instrument cluster is compatible with analog, digital, and hybrid display types. The instrument cluster has a standard OBD-II interface and supports CAN and LIN bus communication protocols. The instrument cluster is fixed to a dedicated calibration station.

[0050] In the signal acquisition module, the CAN / LIN interface module uses a PEAK-CAN USB bus interface card, supporting CAN and LIN bus protocols. It connects to the OBD-II interface of the vehicle's instrument cluster via a standard OBD-II cable, enabling real-time acquisition of signals output by the instrument cluster. The digital signal acquisition card is an NI 9205 digital acquisition card, directly connected to the digital signal output of the vehicle's instrument cluster to acquire switch signals such as turn signal, brake light signal, and fault alarm switch signals. The analog signal acquisition unit uses an AD8421 high-precision analog acquisition chip, connected to the analog signal output of the vehicle's instrument cluster to acquire voltage and current analog signals. The signal conditioning unit consists of a filter circuit, an amplifier circuit, and a shielded enclosure. The filter circuit uses a second-order RC low-pass filter to remove high-frequency interference from the acquired signal; the amplifier circuit uses an instrumentation amplifier to amplify weak analog signals to a identifiable range; and the shielded enclosure effectively prevents external electromagnetic interference from affecting the acquired signal. The components of the signal acquisition module are connected via shielded cables. The outputs of the CAN / LIN interface module, digital signal acquisition card, and analog signal acquisition unit are all connected to the input of the signal conditioning unit. The output of the signal conditioning unit is connected to the data processing and storage module via a USB interface.

[0051] The fault injection module simulates various fault scenarios in automotive instruments to test the accuracy of their indications under fault conditions. The programmable fault injector used is the NI PXIe-6570, which allows control over the type, duration, and intensity of the fault injection. It can generate electrical signals such as sensor faults, communication faults, and power supply faults, simulating faults like sensor signal loss, communication frame errors, and sudden voltage drops. The fault simulation circuit board uses a customized PCB board, integrating short-circuit simulation, open-circuit simulation, and poor contact simulation units. Relays control the switching of fault states. The short-circuit simulation unit uses a thyristor to short-circuit the signal; the open-circuit simulation unit uses an electromagnetic relay to cut off the signal path; and the poor contact simulation unit uses an adjustable resistor to simulate changes in contact resistance, simulating internal instrument wiring short circuits, sensor wiring open circuits, and poor connector contact hardware faults. The fault control unit uses an STM32F407 microcontroller, which communicates with the data processing and storage module via an RS485 interface. It can receive fault injection commands from the data processing and storage module. The microcontroller has a built-in fault injection strategy library, storing parameter configurations for various single and compound faults, and supports custom editing of fault sequences. The outputs of the programmable fault injector and the fault simulation circuit board of the fault injection module are connected to the signal inputs of the vehicle's instrument cluster. The control unit's control terminal is connected to the inputs of both the programmable fault injector and the fault simulation circuit board, ensuring that fault signals are accurately injected into the vehicle's instrument cluster.

[0052] Optical inspection equipment is used to test the optical performance parameters of automotive instrument panel indicator lights, ensuring that the brightness and color of the indicator lights meet design standards and preventing driver misjudgment due to substandard optical performance. Specifically, a illuminance meter measures the brightness parameters of each indicator light on the automotive instrument panel, especially the backlight brightness and alarm indicator brightness. A colorimeter measures the color coordinates, color temperature, and color difference parameters of the indicator lights to ensure that the indicator light colors are consistent with design standards. An industrial camera is used to capture images of the display icons on the automotive instrument panel under various operating conditions, providing image data for icon verification. A three-dimensional adjustable optical adjustment bracket is used to fix the illuminance meter, colorimeter, and image acquisition camera, ensuring that the detection ends of each testing device are aligned with the center of the instrument panel indicator lights at a 45° angle, with a fixed detection distance of 30cm. The optical inspection equipment must operate in a dedicated darkroom with an ambient light level ≤5 lux to avoid interference from external light on the measurement results. The illuminance meter, colorimeter, and image acquisition camera are all connected to the data processing and storage module via a USB 3.0 interface.

[0053] The icon verification module is used to compare the standardization and consistency of icons displayed on the car's instrument panel, avoiding driver misjudgment due to incorrect or distorted icon display. The preset icon library is stored in the local storage unit of the data processing and storage module, containing all icon templates from the car's instrument panel design standards, such as fuel icons, brake icons, turn signal icons, and fault alarm icons. Each icon template includes a standard outline, pixel size, color parameters, and edge feature information. The image recognition unit is developed based on the OpenCV computer vision library and has image preprocessing, icon segmentation, and feature extraction functions. Image preprocessing includes grayscale conversion, noise reduction, and enhancement processing, using Gaussian filtering to remove image noise and histogram equalization to enhance icon edge contrast. Icon segmentation uses a threshold segmentation algorithm to separate the icon area from the background area. Feature extraction uses the SIFT algorithm to extract feature parameters such as icon edges, outlines, and corner points. The comparison and judgment unit uses a template matching algorithm to compare the icon features extracted by the image recognition unit with the corresponding templates in the preset icon library and calculate the feature similarity. The similarity threshold is set to 95%. If the similarity is ≥95%, the icon display is deemed qualified. If the similarity is <95%, the edge jaggedness of the icon is detected. An edge jaggedness of ≤0.5 pixels is qualified, and >0.5 pixels is unqualified. At the same time, the icon color parameters are compared with the template color parameters. A color difference of ≤2 is qualified, and a color difference of >2 is unqualified.

[0054] The data processing and storage module, as the core control and data processing unit of the device, coordinates the work of various modules, processes collected data, and stores verification results. The high-performance processor is an Intel Core i7-12700K, used to run multiple algorithm modules such as signal analysis, optical parameter analysis, and icon comparison, ensuring real-time data processing. The local storage unit uses a solid-state drive (SSD) to store real-time verification data, the operating system, software programs, verification reports, and historical data. Data is categorized and indexed by instrument model and verification time for easy retrieval. The cloud communication module uses a 4G / 5G dual-mode communication module, supporting the TCP / IP protocol, and can upload verification data and reports to the cloud server. The data interaction module, developed based on LabVIEW, includes a visual operation interface for setting parameters for each module, controlling the verification process, displaying data, and generating reports. The software has a built-in verification standard database that stores information such as brightness thresholds, color coordinate ranges, and signal parameter standards for different instrument models. It supports marking non-conforming items, analyzing causes, and generating rectification suggestions; verification reports can be exported.

[0055] Based on the above-mentioned verification device, the specific steps of the automotive instrument indicator verification method of the present invention are as follows.

[0056] First, fix the vehicle instrument panel to be calibrated on the anti-vibration base of the dedicated calibration station, ensuring the instrument panel is securely installed. Connect the CAN / LIN interface module of the signal acquisition module to the OBD-II interface of the vehicle instrument panel via a standard OBD-II connection cable. Connect the digital signal acquisition card and analog signal acquisition unit to the digital signal output terminal and analog signal output terminal of the instrument panel respectively via shielded cables. Connect the output terminal of the programmable fault injector and fault simulation circuit board of the fault injection module to the signal input terminal of the instrument panel. Adjust the position of the optical inspection equipment, fix the illuminance meter, colorimeter, and image acquisition camera with the optical adjustment bracket, and align the detection end of each inspection device with the center of the instrument display area at a 45° angle. Set the detection distance to 30cm, close the dark chamber door, and ensure that the ambient light intensity inside the dark chamber is ≤5 lux.

[0057] Check if the communication connection between each module and the data processing module is normal. Based on the model of the vehicle instrument panel to be verified, load the corresponding preset icon library, fault injection strategy and verification standard threshold. In this embodiment, the brightness standard of the red warning light of the instrument panel is 500-800 lx, the color coordinate standard is (0.64, 0.33), and the icon similarity threshold is 95%.

[0058] Controls all indicator lights on the vehicle's instrument panel to illuminate, all display icons to display normally, and all pointers to be at full scale. It also activates the signal acquisition module to collect the bus signals, digital signals, and analog signals output by the instrument panel, and stores the collected signal data as reference signal data in the local storage unit of the data processing module.

[0059] The optical testing equipment is activated, and the illuminance meter sequentially measures the brightness parameters of each indicator light on the instrument; the colorimeter sequentially measures the color coordinates and color temperature parameters of each indicator light; the image acquisition camera captures the instrument display icons, transmits them to the icon verification module, extracts the reference icon features, and stores them.

[0060] The fault injection and verification signal process is divided into two parts: single fault injection verification and compound fault injection verification, ensuring comprehensive coverage of fault scenarios. Single fault injection verification involves the data processing module sending a single fault injection command to the fault injection module through the fault control unit, sequentially injecting single faults such as sensor faults, communication faults, power supply faults, and hardware faults. Specifically, sensor faults are simulated by a programmable fault injector, such as loss of engine coolant temperature sensor signal or error in speed sensor signal; communication faults are simulated by CAN bus communication frame errors or LIN bus disconnections; power supply faults are simulated by a sudden drop in instrument power supply voltage; and hardware faults are specifically simulated by a fault simulation circuit board, such as short circuits in internal instrument wiring or open circuits in sensor wiring. During each type of fault injection, the signal acquisition module synchronously collects various signals output by the instrument, and the data processing module analyzes the signal data in real time, comparing the signal data under fault conditions with baseline signal data and design standards to determine whether the instrument signal output matches the fault type.

[0061] The composite fault injection verification method specifically involves editing a composite fault sequence through the fault control unit, injecting composite faults such as combinations of sensor and communication faults, or power and hardware faults. For example, simultaneously injecting an engine speed sensor fault and a CAN bus communication fault; or simultaneously injecting a sudden drop in power supply voltage and a short circuit fault in the instrument's internal wiring. The instrument's output signals are simultaneously acquired, the signal data is analyzed, and it is determined whether the instrument's signal response under composite fault conditions is accurate and stable, and whether there are signal losses or false alarms.

[0062] A illuminance meter measures the brightness of each indicator light, and a colorimeter measures the color coordinates and color temperature of each indicator light. The data processing module compares the measured data with the reference optical parameters and the design standard threshold. In this embodiment, the standard brightness of the green normal indicator light of the car instrument is 300-500 lx. If the measured value is 550 lx, which exceeds the standard range, the brightness is deemed unqualified.

[0063] When various faults are injected, the brightness and color coordinates of the corresponding alarm indicator lights are measured simultaneously to determine whether the alarm indicator lights are lit normally and whether the optical parameters meet the standards.

[0064] When the vehicle's instrument panel is functioning correctly, the image acquisition camera captures images of all normally displayed icons, such as the fuel gauge, speedometer, and coolant temperature. The icon verification module preprocesses the images, segments the icon regions, and extracts icon features. The extracted features are then compared with corresponding templates in a pre-set icon library to calculate feature similarity and detect icon edge jaggedness and color difference. When the vehicle's instrument panel is malfunctioning, the corresponding fault alarm icons, such as engine fault alarm icons, brake fault alarm icons, and power fault alarm icons, are captured. Feature extraction and comparison are also performed to determine if the alarm icons are accurately displayed and whether there are any distortions, blurriness, or color errors.

[0065] After fault injection and verification are completed, the data processing and storage module integrates all data from signal verification, optical performance verification, and icon verification to generate a complete verification report. Specifically, the baseline data, data collected under fault conditions, optical measurement data, and icon comparison data are categorized and organized according to verification items, and the verification results for each item are labeled. For non-conforming items, a cause analysis is performed. Combining the instrument structure, circuit design, and verification data, possible causes of the fault are inferred. For example, insufficient brightness may be due to aging of the backlight LED beads or a faulty drive circuit. The verification data and verification report are stored in the local storage unit and uploaded to the cloud server via the cloud communication module to achieve long-term data storage and traceability.

[0066] The beneficial effects of the present invention are described in detail below.

[0067] The present invention provides comprehensive verification dimensions. Through the signal acquisition module, optical detection equipment, and icon verification module, it realizes multi-dimensional verification of instrument signals, optical performance, and display content, covering all indication links in the normal operation and fault state of the instrument, avoiding the problem of missed detection caused by single-dimensional verification.

[0068] The present invention has high verification accuracy by using high-precision signal acquisition components and optical detection equipment, combined with image recognition algorithms, to ensure the accuracy of verification data; and further improves verification accuracy by acquiring and comparing benchmark data.

[0069] This invention features a high degree of automation, achieving full automation of fault injection, signal acquisition, optical detection, icon verification, and data processing without human intervention. This reduces reliance on manual labor, improves verification efficiency, and avoids misjudgments and missed detections caused by manual visual comparison.

[0070] This invention provides comprehensive fault coverage, supporting the injection of single and compound faults. It covers various fault scenarios such as sensor faults, communication faults, power supply faults, and hardware faults, and can test the indication response of instruments under complex fault conditions, ensuring the reliability of instruments in actual operation.

[0071] The data traceability of this invention, through the combination of local storage and cloud storage, enables long-term storage and traceability of verification data and reports, facilitating technicians to analyze the causes of non-conformities and trace the verification process, and providing data support for instrument production improvement.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0073] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An indicating check device for an automotive instrument, characterized by: The automobile instrument, the signal acquisition module, the fault injection module, the optical detection equipment, the icon verification module and the data processing and storage module are electrically connected; the signal output port of the automobile instrument is electrically connected with the signal acquisition module, the signal input port of the automobile instrument is electrically connected with the fault injection module, the optical detection equipment is arranged corresponding to the display area of the automobile instrument, and the signal acquisition module, the fault injection module, the optical detection equipment and the icon verification module are respectively connected with the data processing and storage module. The signal acquisition module is used for collecting various electrical signals output by the automobile instrument, the fault injection module is used for injecting preset fault signals into the automobile instrument, the optical detection equipment is used for detecting the optical performance parameters of the indicator light of the automobile instrument, the icon verification module is used for comparing the display icons of the automobile instrument, and the data processing and storage module is used for processing the collected data, controlling the cooperative work of the modules and storing the verification results.

2. An indicating check device for an automotive instrument as defined in claim 1, wherein: The signal acquisition module includes a CAN / LIN interface module, a digital signal acquisition card, an analog signal collector and a signal conditioning unit; the CAN / LIN interface module is connected with the automobile instrument through an OBD-II interface; the digital signal acquisition card is connected with the digital signal output end of the automobile instrument; the analog signal collector is connected with the analog signal output end of the automobile instrument; and the output end of the signal conditioning unit is connected with the data processing and storage module.

3. An indicating check device for an automotive instrument as defined in claim 1, wherein The fault injection module includes a programmable fault injector, a fault simulation circuit board and a fault control unit; the programmable fault injector is used for generating electrical signals of sensor faults, communication faults and power supply faults and injecting them into the automobile instrument; the fault simulation circuit board is used for simulating hardware faults such as short circuit, open circuit and poor contact; and the fault control unit is connected with the data processing and storage module in communication and is used for receiving fault injection instructions.

4. An indicating check device for an automotive instrument as defined in claim 1, wherein The optical detection equipment includes a light illuminometer, a colorimetric analyzer, an image acquisition camera and an optical adjustment support; the light illuminometer is used for measuring the brightness of the indicator light of the automobile instrument; the colorimetric analyzer is used for measuring the color coordinates of the indicator light; the image acquisition camera is used for shooting the display icons of the automobile instrument; and the optical adjustment support is used for fixing the optical detection equipment.

5. An indicating check device for an automotive instrument as defined in claim 1, wherein: The icon verification module includes a preset icon library, an image recognition unit and a comparison and judgment unit; The preset icon library stores various icon templates in the design standard of the automobile instrument; The image recognition unit is used for extracting the icon edge, contour and pixel features shot by the image acquisition camera; and the comparison and judgment unit is used for comparing the extracted icon features with the templates in the preset icon library to determine whether the icon display conforms to the standard.

6. The indicating calibration device for an automotive instrument as set forth in claim 1, wherein: The data processing and storage module includes a high-performance processor, a local storage unit, a cloud communication module and a data interaction module; the high-performance processor is used for running data processing algorithms to realize signal analysis, optical parameter analysis and icon comparison result integration; the local storage unit is used for storing verification data and results; the cloud communication module is used for uploading the verification data to a cloud server; and the data interaction module is used for data query, traceability and report generation.

7. The indicating calibration device for an automotive instrument as set forth in claim 2, wherein: The signal conditioning unit is connected with the data processing and storage module through a shielded wire.

8. A method of checking the checking means of an automobile instrument as claimed in any one of claims 1 to 7, characterized in that: The method comprises the following steps: Step one: fix the automobile instrument on the calibration station, connect the signal acquisition module with the signal port of the automobile instrument, connect the fault injection module with the input port of the automobile instrument, adjust the position of the optical detection equipment, and make the detection end align with the display area of the instrument; Start the data processing and storage module, load the preset icon library, fault injection strategy, and calibration standard threshold value; Step two: collect the bus signal, digital signal, and analog signal output by the automobile instrument through the signal acquisition module, collect the reference brightness and color coordinate parameters of the indicator light through the optical detection equipment, collect the reference icon features through the icon calibration module, and store the data to the data processing and storage module; Step three: inject preset fault signals into the automobile instrument through the fault injection module, including single fault and composite fault; Synchronously collect the instrument output signal in the fault state through the signal acquisition module, analyze the signal data through the data processing and storage module, and determine whether the instrument signal output matches the fault type; Step four: in the fault injection process and in the no-fault state, collect the brightness and color coordinate parameters of each indicator light of the instrument through the optical detection equipment multiple times, compare the collected data with the reference data and the design standard threshold value through the data processing and storage module, and determine whether the optical performance is qualified; Step five: shoot the display icons of the instrument in each working condition through the image acquisition camera, extract the icon features through the icon calibration module, and compare the icon features with the preset icon library template to determine whether the icon display integrity, consistency, and edge serration degree meet the standard; Step six: integrate the results of signal calibration, optical performance calibration, and icon calibration through the data processing and storage module, generate a calibration report, and mark the unqualified items; Store the calibration data and report to the local and cloud, and output the calibration result.

9. A method of checking a checking device of an automobile instrument according to claim 8, characterized in that: The composite fault in step three includes the combination of sensor fault and communication fault, and the combination of power fault and hardware fault.

10. The method of claim 8, wherein: the display is a display of an automobile instrument; and the display is a display of a check device of the automobile instrument. The optical detection in step four needs to be carried out in a dark box environment.

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