Commercial vehicle light calibration system and method

Abstract

The invention discloses a commercial vehicle light calibration system and method. The system comprises a calibration upper computer, a vehicle-mounted controller ECU and a vehicle-mounted bus analyzer VBA. The calibration upper computer is used for providing a user operation interface and running a calibration program; the vehicle-mounted controller ECU is used for controlling vehicle lamplight and adjusting the lamplight brightness according to the calibration instruction; the vehicle-mounted bus analyzer VBA is connected with the calibration upper computer through a USB interface and is in communication connection with the ECU through an LIN bus; wherein the calibration upper computer comprises an LED light calibration module, a control command module, a switch key acquisition module and a product information module; the LED light calibration module is used for executing security algorithm verification, setting a reference voltage brightness value after verification is passed, executing one-key calibration and checking calibration data; the control command module is used for testing a light hardware state; the switch key acquisition module is used for monitoring an external switch signal; and the product information module is used for recording and querying a calibration result.

Description

Technical Field

[0001] This application relates to the field of automotive electronics technology, and more specifically, to a lighting calibration system and method for commercial vehicles. Background Technology

[0002] With the rapid development of commercial vehicle electronics technology, headlight brightness calibration methods, as a key aspect of automotive electronic equipment development, are crucial for ensuring vehicle performance meets national standards and fulfills customer needs. Currently, commercial vehicle headlight calibration primarily relies on controller LIN bus communication technology, using the ERC-LIN calibration protocol to configure brightness values ​​for various lights under different voltages. However, existing calibration methods require point-by-point adjustment of brightness values ​​within a wide voltage range (e.g., 16V to 32V), and each type of light needs independent calibration. This results in an exponential increase in calibration workload with the number of lights, making the operation cumbersome and inefficient, severely restricting the development cycle.

[0003] In addition, due to the need for technical confidentiality, manufacturers usually use a security unlocking mechanism to control access to the calibration software. However, the existing security algorithms are relatively simple and easy to crack or bypass, resulting in reliability risks in the calibration process. For example, miscalibration or incorrect calibration occurs frequently, which may lead to substandard lighting performance or even safety hazards. Therefore, the current technology has the following significant defects: (1) manual calibration of multiple voltage points one by one leads to low efficiency; (2) the security authentication mechanism is weak, and the calibration process is easily interfered with or tampered with; (3) there is a lack of intelligent calibration methods, which makes it difficult to adapt to the flexible needs of multiple vehicle models and multiple lighting configurations.

[0004] In summary, there is an urgent need for an efficient, reliable, and safe method for calibrating commercial vehicle lights to address the problems of low efficiency, poor reliability, and high safety risks in existing technologies. Summary of the Invention

[0005] This application provides a commercial vehicle lighting calibration system and method, which is integrated, highly efficient and highly safe, and supports one-click calibration, dual safety verification, real-time data verification and hardware status detection.

[0006] The specific technical solution is as follows: In a first aspect, embodiments of this application provide a commercial vehicle lighting calibration system, including: The calibration host computer is used to provide a user interface and run the calibration program; The vehicle control unit (ECU) is used to control the vehicle lights and adjust the brightness of the lights according to calibration instructions. The vehicle bus analyzer (VBA) is connected to the calibration host computer via a USB interface and communicates with the ECU via a LIN bus. The calibration host computer includes an LED light calibration module, a control command module, a switch button acquisition module, and a product information module. The LED light calibration module is used to perform safety algorithm verification. After successful verification, a reference voltage brightness value is set, one-click calibration is performed, and the calibration data is checked. The control command module is used to test the light hardware status. The switch button acquisition module is used to monitor external switch signals. The product information module is used to record and query calibration results.

[0007] In some embodiments of this application, the calibration host computer further includes a project management unit, which is used to detect the VBA connection status, issue a prompt when not connected, create a new calibration project, load the LDF file, environment variable file and interface layout file, and configure communication parameters; wherein, the communication parameters include baud rate, VCI channel and network segment identifier.

[0008] In some embodiments of this application, the LED light calibration module includes a first safety algorithm unit, a one-click calibration unit, and a read verification unit; the first safety algorithm unit is used to perform safety verification before calibration; the one-click calibration unit is used to calculate and write the PWM duty cycle under multiple voltages to the ECU based on the preset light brightness and its PWM duty cycle; the read verification unit is used to read the calibrated data in the ECU and verify it.

[0009] In some embodiments of this application, the one-key calibration unit calculates and writes the PWM duty cycle under multiple voltages to the ECU based on the preset light brightness and its PWM duty cycle, specifically for: Receive the preset voltage target PWM duty cycle input by the user; Based on the preset voltage-duty cycle relationship coefficient, calculate the corresponding PWM duty cycle for at least three voltage points within the preset range; The data is written in batches to the non-volatile memory of the ECU via LIN communication.

[0010] In some embodiments of this application, the control command module includes a second security algorithm unit, a light control unit, and a hardware detection unit; the second security algorithm unit is used to perform operation permission verification; the light control unit is used to control the on / off state of a specified light through a host computer interface; and the hardware detection unit is used to determine whether the LED and related circuits are functioning properly based on the light status.

[0011] In some embodiments of this application, both the first security algorithm unit and the second security algorithm unit employ a two-way verification mechanism; The two-way verification mechanism includes: the ECU generating a random seed and sending it to the calibration host computer; the calibration host computer and the ECU respectively using the manufacturer's encryption algorithm to process the seed to obtain an intermediate value; the calibration host computer and the ECU respectively using the HMAC algorithm to perform secondary encryption on the intermediate value to generate a check code; comparing the check codes of the calibration host computer and the ECU, if they match, the verification is successful and the calibration function is unlocked.

[0012] In some embodiments of this application, the switch button acquisition module monitors external switch signals, specifically for: The status signals of physical switches or buttons connected to the ECU are collected and displayed in real time, and lighting control or calibration process triggering is performed based on the collected status signals.

[0013] In some embodiments of this application, the product information module records and queries calibration results, specifically for: Obtain the product information of the ECU and determine whether it has been calibrated based on the product information; wherein, the product information includes part number, software version, production batch and calibration status information.

[0014] Secondly, embodiments of this application provide a commercial vehicle headlight calibration method based on the first aspect, including: Start the calibration software on the host computer, connect to the vehicle bus analyzer VBA and check the communication status; Create a new project and configure the hardware and protocol parameters; The LED light calibration module performs safety algorithm verification. After successful verification, the user enters the function module interface, sets the reference voltage and brightness values, performs one-click calibration, and verifies the calibration data. The control command module tests the lighting hardware status, the switch button acquisition module monitors external switch signals, and the product information module records and queries the calibration results.

[0015] In some embodiments of this application, setting the reference voltage brightness value and performing one-click calibration specifically includes: Based on the preset light brightness and its PWM duty cycle, the PWM duty cycle under multiple voltages is calculated and written to the ECU.

[0016] The beneficial effects of the embodiments of this application are as follows: This application achieves one-click multi-voltage calibration, significantly improving calibration efficiency. It also employs a dual encryption security mechanism to enhance system security, and integrates lighting control and hardware detection functions, improving calibration reliability and practicality. Furthermore, this application possesses comprehensive data verification and status monitoring capabilities, making it suitable for the efficient and safe calibration of commercial vehicle lighting systems. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the components of a commercial vehicle lighting calibration system provided in an embodiment of this application; Figure 2 This is a flowchart of the main interface of the commercial vehicle lighting calibration system provided in this application embodiment; Figure 3 A flowchart of the safety algorithm for a commercial vehicle lighting calibration system provided in this application embodiment; Figure 4 This is a diagram of the host computer interface for LED light PWM calibration provided in an embodiment of this application. Figure 5 A diagram showing the duty cycle coefficient relationship of the left upper rearview mirror selection button light (backlight) under different voltages provided in the embodiments of this application; Figure 6 A diagram illustrating the control command and switch button acquisition function interface provided in this application embodiment; Figure 7 This is a diagram of the product information interface provided in an embodiment of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0021] This application discloses a commercial vehicle lighting calibration system. Detailed descriptions follow.

[0022] Figure 1A commercial vehicle lighting calibration system according to an embodiment of this application is shown. Figure 1 As shown, the commercial vehicle lighting calibration system includes: a calibration host computer 1, an Electronic Control Unit (ECU) 2, and a Vehicle Bus Analyzer (VBA) 3. The calibration host computer 1 provides a user interface and runs the calibration program. The ECU 2 controls the vehicle lights and adjusts the brightness according to the calibration instructions. The VBA 3 connects to the calibration host computer 1 via a USB interface and communicates with the ECU 2 via a LIN bus. The interface of the calibration host computer 1 supports loading LDF, environment variables, and interface layout files. It integrates lighting calibration, control commands, switch acquisition, and product information reading functions. In practice, these functions first enter the End of Line Testing Tool (EOL) of the automotive production line. Before entering the EOL, a security algorithm is required. This security algorithm is more secure than previous algorithms and is less likely to be cracked, making the calibration process safer and more reliable. Specifically, the calibration host computer 1 includes an LED lighting calibration module 11, a control command module 12, a switch button acquisition module 13, and a product information module 14. The LED light calibration module 11 is the main part of the calibration system. It is used to perform safety algorithm verification. After successful verification, it sets the reference voltage brightness value, performs one-click calibration, and verifies the calibration data. This module realizes the one-click calibration function and reads the data after calibration to see if it meets expectations. The control command module 12 is used to test the lighting hardware status. Its main function is to light up the calibrated light and observe the brightness of the calibrated light. It can also use optical instruments to obtain the specific brightness value. This function effectively tests the feasibility and accuracy of the one-click calibration function, improves the overall reliability of the system, and can also verify some hardware problems, such as LEDs being damaged and unable to light up. This function can also be used to obtain the real-time status of ECU2. The switch button acquisition module 13 is used to monitor external switch signals. Its switch button controls the calibrated LED light. This switch is a hardware switch on ECU2 that can control the LED light to turn on and off. The product information module 14 is used to record and query calibration results. Through the product information obtained by this module, it is possible to accurately identify whether this ECU2 has been calibrated during the calibration process, thereby reducing the waste of human resources and avoiding unnecessary economic and time losses. In the specific implementation process, the control command and switch button acquisition interface, such as Figure 6 As shown, the product information interface is as follows: Figure 7As shown. In the specific implementation process, the switch / button acquisition module 13 is specifically used to acquire and display the status signals of the physical switches or buttons connected to the ECU2 in real time, and to trigger lighting control or calibration procedures based on the acquired status signals. Furthermore, the product information module 14 is specifically used to acquire the product information of the ECU2 and determine whether calibration has been performed based on the product information. The product information includes part number, software version, production batch, and calibration status information.

[0023] In some embodiments, the calibration host computer 1 further includes a project management unit. The project management unit is used to detect the VBA3 connection status, issue a prompt when the connection is lost, create a new calibration project, load the LDF file, environment variable file, and interface layout file, and configure communication parameters. These communication parameters include baud rate, VCI channel, and network segment identifier.

[0024] In this embodiment, the ECU2 is connected to a communication tool (VBA3) via a LIN cable. After the VBA3 is connected to the PC of the calibration host computer 1 via a USB cable, the hardware's baud rate, network segment, VCI channel, protocol, and other configuration items are configured. The LDF file, environment variable.xml file, and interface.illay file are then loaded into the project. The LDF file contains variable information for the master and slave nodes, which is used to acquire messages sent by the ECU. The environment variable.xml file is strongly associated with the interface; the defined variables are bound to controls in the interface. For example, the one-click calibration button and the read verification button each have corresponding environment variables. The interface.illay file mainly includes the main content of the interface, containing all controls, presenting a more intuitive user experience in a visual manner and improving the user experience. The calibration system is built on the LIN2.2 communication protocol and the ERC-LIN calibration protocol. The calibration host computer 1 and ECU2 communicate via the LIN2.2 communication protocol and the ERC-LIN calibration protocol.

[0025] In other embodiments, the LED light calibration module 11 includes a first security algorithm unit, a one-click calibration unit, and a read verification unit. The first security algorithm unit performs security verification before calibration. The one-click calibration unit calculates and writes the PWM duty cycle under multiple voltages to the ECU2 based on the preset light brightness and its PWM duty cycle. The read verification unit reads the calibrated data in the ECU2 and verifies it. Further, the one-click calibration unit calculates and writes the PWM duty cycle under multiple voltages to the ECU2 based on the preset light brightness and its PWM duty cycle, specifically by: receiving the preset voltage target PWM duty cycle input by the user; calculating the corresponding PWM duty cycle for at least three voltage points within a preset range based on the preset voltage-duty cycle relationship coefficient; and writing the data in batches to the non-volatile memory of the ECU2 via LIN communication. That is, in the calibration method of this application, the user only needs to set the brightness value under the reference voltage, and the system automatically calculates the PWM value under multiple voltages based on the voltage-duty cycle relationship coefficient and writes it to the ECU, achieving one-click calibration. After calibration, the system automatically verifies data consistency and provides light control functions to assist in testing. In addition, the control command module 12 includes a second security algorithm unit, a lighting control unit, and a hardware detection unit; the second security algorithm unit is used to perform operation permission verification; the lighting control unit is used to control the on / off state of a specified light through the host computer interface; and the hardware detection unit is used to determine whether the LED and related circuits are normal based on the light status.

[0026] This application employs a double encryption security algorithm for identity verification to ensure the calibration process is secure and reliable.

[0027] In the specific implementation process, both the first security algorithm unit and the second security algorithm unit adopt a two-way verification mechanism. Furthermore, this two-way verification mechanism includes: ECU2 generates a random seed and sends it to the calibration host computer 1; the calibration host computer 1 and ECU2 respectively process the seed using the manufacturer's encryption algorithm to obtain an intermediate value; the calibration host computer 1 and ECU2 respectively use the HMAC algorithm to perform secondary encryption on the intermediate value to generate a checksum; the checksums of the calibration host computer 1 and ECU2 are compared, and if they match, the verification is successful, and the calibration function is unlocked.

[0028] like Figure 2 and Figure 3As shown in this embodiment, when the software in the calibration host computer 1 runs, it first connects to VBA3. If it is not connected, a corresponding prompt will be displayed during the running process. After connecting to VBA3, a new calibration project is created, and hardware configuration information such as baud rate is configured. The project is then run, and the EOL button is clicked first. Then, on the main interface of the calibration system, LED PWM light calibration, control commands, switch button acquisition, and product information reading are performed. A security algorithm is used when entering the EOL button. This algorithm takes the random seed sent by ECU2 as input. The calibration host computer 1 and ECU2 respectively use the manufacturer's encryption and decryption algorithms to calculate the next output value. This value is then used as input for secondary encryption and decryption calculation using the HMAC algorithm. After calculation, the outputs of the two are checked to see if they match. If they match, the security unlock is successful; otherwise, the verification fails, and subsequent processes such as calibration cannot proceed. This dual encryption mechanism significantly improves the system's security and anti-cracking capabilities, making it suitable for commercial vehicle electronic calibration scenarios with high security requirements.

[0029] In a specific implementation process, such as Figure 4 As shown, the LED light calibration interface is the core functional module of this system. Users select the type of light to be calibrated (e.g., "left upper rearview mirror backlight") and enter the PWM duty cycle value (e.g., 60%) corresponding to the target brightness in the "24V Duty Cycle" input box. Since the brightness of 24V light has a certain coefficient relationship with the brightness of light under other voltages, such as... Figure 5 The diagram illustrates the duty cycle relationship of the rearview mirror selection button light under different voltages. Therefore, by setting a brightness duty cycle, the light duty cycle under all voltages can be calculated and written to the ECU2's E... ２ In the process, complete the brightness setting. In practical applications, if the current brightness and current duty cycle are obtained, the duty cycle corresponding to the target design brightness can be calculated. The calculation formula is as follows: ; After writing the duty cycle of the backlight under 24V voltage, click Read Verification. The display will show the light duty cycle corresponding to different voltage values ​​in ECU2. If the displayed value does not match the calculated value, no message will be given indicating that the read data is correct.

[0030] Corresponding to the above system embodiments, another embodiment of this application provides a commercial vehicle headlight calibration method, including the following steps: Start the calibration software on the host computer, connect to the vehicle bus analyzer VBA and check the communication status; Create a new project and configure the hardware and protocol parameters; The LED light calibration module performs safety algorithm verification. After successful verification, the user enters the function module interface, sets the reference voltage and brightness values, performs one-click calibration, and verifies the calibration data. The control command module tests the lighting hardware status, the switch button acquisition module monitors external switch signals, and the product information module records and queries the calibration results.

[0031] The process of setting a reference voltage brightness value and performing one-click calibration includes: calculating and writing the PWM duty cycle under multiple voltages to the ECU based on the preset light brightness and its PWM duty cycle.

[0032] In summary, the commercial vehicle lighting calibration system and method provided in this application significantly reduce the time cost of manual calibration compared to existing calibration systems. Calibration of 16-32V voltage can be completed simply by inputting 24V, effectively saving manpower and reducing workload. This application also incorporates upper-level computer control buttons, allowing for more flexible operation of the hardware LED lights, improving efficiency while testing hardware functionality, and ensuring equipment quality through multiple methods. Simultaneously, the manufacturer's security algorithm is re-encrypted, increasing its complexity. These two methods enhance the reliability of the security algorithm and improve calibration security, making it suitable for efficient and safe calibration of commercial vehicle lighting systems.

[0033] It should be noted that the above method embodiments correspond to the system embodiments and have the same technical effects. For detailed descriptions, please refer to the system embodiments. The method embodiments are based on the system embodiments; detailed descriptions can be found in the system embodiments section, and will not be repeated here. Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application.

[0034] Those skilled in the art will understand that the modules in the apparatus of the embodiments can be distributed in the apparatus of the embodiments as described in the embodiments, or they can be located in one or more devices different from this embodiment with corresponding changes. The modules of the above embodiments can be combined into one module, or they can be further divided into multiple sub-modules.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the above embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A commercial vehicle lighting calibration system, characterized in that, include: The calibration host computer is used to provide a user interface and run the calibration program; The vehicle control unit (ECU) is used to control the vehicle lights and adjust the brightness of the lights according to calibration instructions. The vehicle bus analyzer (VBA) is connected to the calibration host computer via a USB interface and communicates with the ECU via a LIN bus. The calibration host computer includes an LED light calibration module, a control command module, a switch button acquisition module, and a product information module. The LED light calibration module is used to perform safety algorithm verification. After successful verification, a reference voltage brightness value is set, one-click calibration is performed, and the calibration data is checked. The control command module is used to test the light hardware status. The switch button acquisition module is used to monitor external switch signals. The product information module is used to record and query calibration results.

2. The commercial vehicle lighting calibration system according to claim 1, characterized in that, The calibration host computer also includes a project management unit, which is used to detect the VBA connection status and issue a prompt when the connection is not established. The project management unit also creates a new calibration project, loads the LDF file, environment variable file, and interface layout file, and configures the communication parameters, including the baud rate, VCI channel, and network segment identifier.

3. The commercial vehicle lighting calibration system according to claim 1, characterized in that, The LED light calibration module includes a first safety algorithm unit, a one-click calibration unit, and a read verification unit. The first safety algorithm unit is used to perform safety verification before calibration. The one-click calibration unit is used to calculate and write the PWM duty cycle under multiple voltages to the ECU based on the preset light brightness and its PWM duty cycle. The read verification unit is used to read the calibrated data in the ECU and verify it.

4. The commercial vehicle lighting calibration system according to claim 3, characterized in that, The one-key calibration unit calculates and writes the PWM duty cycle under multiple voltages to the ECU based on the preset light brightness and its PWM duty cycle, specifically for: Receive the preset voltage target PWM duty cycle input by the user; Based on the preset voltage-duty cycle relationship coefficient, calculate the corresponding PWM duty cycle for at least three voltage points within the preset range; The data is written in batches to the non-volatile memory of the ECU via LIN communication.

5. The commercial vehicle lighting calibration system according to claim 3, characterized in that, The control command module includes a second security algorithm unit, a lighting control unit, and a hardware detection unit; the second security algorithm unit is used to perform operation permission verification; the lighting control unit is used to control the on / off state of a specified light through a host computer interface; and the hardware detection unit is used to determine whether the LED and related circuits are functioning properly based on the light status.

6. The commercial vehicle lighting calibration system according to claim 5, characterized in that, Both the first security algorithm unit and the second security algorithm unit employ a two-way verification mechanism; The two-way verification mechanism includes: the ECU generating a random seed and sending it to the calibration host computer; the calibration host computer and the ECU respectively using the manufacturer's encryption algorithm to process the seed to obtain an intermediate value; the calibration host computer and the ECU respectively using the HMAC algorithm to perform secondary encryption on the intermediate value to generate a check code; comparing the check codes of the calibration host computer and the ECU, if they match, the verification is successful and the calibration function is unlocked.

7. The commercial vehicle lighting calibration system according to claim 1, characterized in that, The switch button acquisition module monitors external switch signals, specifically for: The status signals of physical switches or buttons connected to the ECU are collected and displayed in real time, and lighting control or calibration process triggering is performed based on the collected status signals.

8. The commercial vehicle lighting calibration system according to claim 1, characterized in that, The product information module records and queries calibration results, specifically for: Obtain the product information of the ECU and determine whether it has been calibrated based on the product information; wherein, the product information includes part number, software version, production batch and calibration status information.

9. A commercial vehicle headlight calibration method based on any one of claims 1-8, characterized in that, include: Start the calibration software on the host computer, connect to the vehicle bus analyzer VBA and check the communication status; Create a new project and configure the hardware and protocol parameters; The LED light calibration module performs safety algorithm verification. After successful verification, the user enters the function module interface, sets the reference voltage and brightness values, performs one-click calibration, and verifies the calibration data. The control command module tests the lighting hardware status, the switch button acquisition module monitors external switch signals, and the product information module records and queries the calibration results.

10. The commercial vehicle headlight calibration method according to claim 9, characterized in that, The setting of the reference voltage brightness value and the execution of one-click calibration specifically include: Based on the preset light brightness and its PWM duty cycle, the PWM duty cycle under multiple voltages is calculated and written to the ECU.

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