Automobile gear function testing device based on single-chip microcomputer

Abstract

The invention discloses an automobile gear function testing device based on a single-chip microcomputer, specifically, the automobile gear function testing device comprises a control module developed by using the single-chip microcomputer, and the control module carries out gear simulation control and whole automobile feedback signal acquisition through two paths of CAN signals respectively; the display screen is connected with the control module and is at least used for displaying gear execution information; and the switch group is connected with the control module, is provided with a plurality of buttons and is used for manually triggering various gear operations. Therefore, the process and the result of gear control can be verified by using the CAN channel of the whole vehicle, and the closed loop of the test process is completed so as to improve the reliability. Furthermore, a standard operation process template file can be formed, so that the test efficiency can be improved while the use difficulty of the device is greatly reduced. The test hardware platform is convenient and fast to deploy, the test process is efficient and reliable, the manual participation degree can be effectively reduced, linkage with other external equipment is facilitated through an open architecture, and the test automation level is improved.

Description

Technical Field

[0001] This invention relates to the field of automotive testing technology, and in particular to a microcontroller-based automotive gear shift function testing device. Background Technology

[0002] The gear shifting function is a crucial factor in controlling vehicle movement. Current testing technologies generally employ manual operation, which offers the advantage of high freedom and allows testing under various driving conditions. However, to avoid occasional gear shifting failures, automakers commonly use stress testing. For repeated tests, the infeasibility of manual operation becomes apparent, failing to guarantee test continuity and consistency, resulting in low testing efficiency, poor repeatability, and high labor costs. In response, the industry has proposed using a gear shifting robot. However, this requires the robot to be installed before each test. During testing, the robot's operating arm connects to the car's gear lever, and manual gear shifting allows the robot to learn and control the car's gears.

[0003] Analysis of current gear testing solutions used in the industry reveals at least the following shortcomings:

[0004] (1) The actual vehicle shifting structure is diverse and difficult to adapt to all models.

[0005] (2) Each test is simple and requires multiple inputs of test conditions, making it impossible to automate the test.

[0006] (3) The gear control robot is complicated to install and requires self-learning before it can be used. When the robot moves, it may cause gear shifting failure and vehicle damage.

[0007] (4) The lack of a verification mechanism for the control results leads to abnormal situations in the vehicle that do not meet expectations. Summary of the Invention

[0008] In view of the above, the present invention aims to provide a microcontroller-based automotive gear shift function testing device to solve the aforementioned technical problems.

[0009] The technical solution adopted in this invention is as follows:

[0010] This invention provides a microcontroller-based automotive gear shift function testing device, which includes: a control module developed using a microcontroller, wherein the control module performs gear shift simulation control and vehicle feedback signal acquisition through two CAN signals respectively;

[0011] The display screen connected to the control module is used to display at least gear position execution information;

[0012] A switch group connected to the control module is provided with several buttons for manually triggering various gear operations.

[0013] In at least one of the possible implementations, a test program is pre-programmed into the control module. After the control module is powered on, the pre-programmed test program is automatically started and executed, and the feedback data after the vehicle performs gear shifting is saved to a storage unit connected to the control module.

[0014] In at least one possible implementation, the vehicle gear function testing device further includes: a host computer, which is used to control the gear operation by having the user input gear control parameters of the gear combination, and to output the vehicle's gear execution status in real time on the display screen through the collected feedback signals.

[0015] In at least one of the possible implementations, a multi-step cyclical test process is performed by inputting a preset format instruction verification table, and the vehicle's gear instructions are verified by recording the gear position signals fed back by the vehicle and combining them with the instruction verification table.

[0016] In at least one possible implementation, the instruction verification table includes: gear simulation control instructions listed in a predetermined order, and for each gear simulation control instruction, there are verification, completion, error and execution step information.

[0017] In at least one of the possible implementations, when the feedback signal indicates that the gear operation has not been performed according to the predetermined steps, the vehicle gear function testing device automatically controls the test vehicle to switch to P gear and outputs an alarm signal through a buzzer connected to the control module.

[0018] Compared with existing technologies, the main design concept of this invention lies in developing a gear control module based on a microcontroller to complete vehicle testing under complex multi-step conditions. Specifically, it includes a control module developed using a microcontroller, which performs gear simulation control and vehicle feedback signal acquisition via two CAN signals; a display screen connected to the control module, used to display at least gear execution information; and a switch group connected to the control module, equipped with several buttons for manually triggering various gear operations. Thus, feedback data collected via the vehicle's CAN channel can be used to verify the gear control process and results, completing a closed-loop test process to improve reliability. Furthermore, a standard operating procedure template file can be created, significantly reducing the difficulty of using the device while improving testing efficiency. The testing hardware platform of this invention is convenient and quick to deploy, and the testing process is efficient and reliable, effectively reducing manual intervention. Its open architecture facilitates integration with other external devices, improving the level of testing automation. Attached Figure Description

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of a microcontroller-based automotive gear shift function testing device provided in an embodiment of the present invention. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] This invention proposes an embodiment of a microcontroller-based automotive gear shift function testing device, specifically, as follows: Figure 1 As shown, it includes: a control module (developed based on the STM32F407ZGT6 microcontroller). The control module uses two CAN signals to perform gear simulation control and vehicle signal acquisition respectively. That is, one of the two CAN signals outputs a gear message to control the simulated gear changes of the vehicle, while the other CAN signal acquires vehicle signals, at least the gear data sent by the vehicle, which can be used to verify with the gear control commands and save logs.

[0023] The display screen (LCD) connected to the control module is used to display at least the actual gear position execution information;

[0024] The switch group connected to the control module is equipped with several buttons for manually triggering various gear operations. That is, the entire test device provided by the present invention can be used independently without the need for host computer control. Gear operations, including but not limited to gear shifting and long-term stuck operations, can be controlled by buttons. In addition to manually triggering the output of gear operation simulation commands through the switch group, other test methods that do not require host computer participation can also be used. For example, the test program can be pre-programmed into the microcontroller, and the control module and other components can be powered through the vehicle's USB to automatically start and execute the pre-programmed test program, and the data after the vehicle performs gear operations can be saved to a preset SD card connected to the control module.

[0025] Of course, in other embodiments, the testing device can also be controlled by a host computer. By inputting multi-step operation instructions for gear combinations into the host computer, the testing can be automated. For example, after installing the host computer software on a PC and connecting it to the control module, gear operation control is performed by inputting gear control parameters into the host computer, and the vehicle's feedback on gear execution status is viewed in real time on the display screen through the collected signals. Based on this concept, it is preferable to complete a series of multi-step test procedures by inputting a preset format instruction verification table (such as an EXCEL file), such as, but not limited to, 100 consecutive D / P switching operations after pressing the gear lever for a long time of 5 minutes, thereby realizing automated testing of gear functions that are difficult to perform manually.

[0026] Therefore, to supplement this, for test schemes that control gear position via a host computer, the gear position signal can be debugged in advance. For example, the brake can be pressed, and gear position test content (such as cyclic test) can be input into the host computer to observe whether the vehicle performs gear position change according to the current test signal.

[0027] After debugging, the gear position CAN messages fed back by the vehicle are recorded and compiled in the gear position calibration interface of the host computer software to create the aforementioned command verification table. This table is used to simulate and verify the vehicle's gear position signals to complete gear position control. The command verification table can be elaborated as follows: This table can be considered a template file, which controls the vehicle's gear positions through sequential logic, as shown in the table below:

[0028]

[0029] Each simulated gear control command, once issued, is verified using feedback information collected from the vehicle's CAN bus. The verification result and execution time are recorded accordingly. Therefore, even better, if a control command fails to follow the predetermined steps, the vehicle can be automatically shifted to Park (P) and an alarm signal can be output, displaying the problematic steps and causes of the fault as shown in the table. For example, at least, a buzzer connected to the control module could promptly alert the test personnel in case of an abnormal situation.

[0030] This will be illustrated with specific test examples:

[0031] In the test chamber equipped with a chassis dynamometer, the vehicle to be tested is secured to the chassis dynamometer using a vehicle tying device, with the front fan nozzle facing the vehicle. In addition, if the vehicle has exhaust emissions, an exhaust extraction system can be installed. After the vehicle is secured, a test run can be conducted to ensure that there are no abnormal problems with the vehicle.

[0032] Subsequently, with the vehicle in a ready state, a pedal robot can be connected via the reserved serial port of the control module to replace manual braking. The tester inputs a gear position signal (PDNRP) to the host computer, sends a simulated gear position message to the vehicle, and collects signals from the vehicle's CAN network to verify the test targets in the table file, thus completing the entire test process. It is important to emphasize that during the above test process, the tester primarily plays a safety monitoring role and should not perform any operations on vehicle components in non-emergency situations.

[0033] Generally, gear control works by manually operating the gear lever to change gears. During gear lever operation, the gear shifter assembly TCU sends a gear position message, which includes various information: the target gear information, the target gear verification information, and information on whether a fault exists. This invention replaces the original vehicle-state gear position message with a single CAN signal from the control module (microcontroller) (whether triggered by a button, a programmed program, or a host computer). This simulates sending the original vehicle gear position message, enabling short-term gear shifting, long-term stuck gear shifting, simultaneous triggering of multiple target gears, and high-frequency gear shifting, thus achieving the purpose of fully testing the vehicle's gear shifting function.

[0034] In summary, the main design concept of this invention lies in developing a gear control module based on a microcontroller to complete vehicle testing under complex, multi-step conditions. Specifically, it includes a control module developed using a microcontroller, which performs gear simulation control and collects vehicle feedback signals via two CAN signals; a display screen connected to the control module, used to display at least gear execution information; and a switch group connected to the control module, equipped with several buttons for manually triggering various gear operations. Thus, feedback data collected via the vehicle's CAN channel can be used to verify the gear control process and results, completing a closed-loop testing process to improve reliability. Furthermore, a standard operating procedure template file can be created, significantly reducing the difficulty of using the device while improving testing efficiency. The testing hardware platform of this invention is convenient and quick to deploy, and the testing process is efficient and reliable, effectively reducing manual intervention. Its open architecture facilitates integration with other external devices, improving the level of testing automation.

[0035] In this invention, when directional terms are mentioned, they are relative concepts based on the embodiments. Furthermore, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0036] The above description of the structure, features, and effects of the present invention is based on the embodiments shown in the figures. However, the above are only preferred embodiments of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched by those skilled in the art to form a variety of equivalent solutions without departing from or changing the design concept and technical effects of the present invention. Therefore, the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A microcontroller-based automotive gear shift function testing device, characterized in that, include: A control module developed using a microcontroller is used to perform gear simulation control and vehicle feedback signal acquisition via two CAN signals. The display screen connected to the control module is used to display at least gear position execution information; A switch group connected to the control module is provided with several buttons for manually triggering various gear operations.

2. The microcontroller-based automotive gear shift function testing device according to claim 1, characterized in that, A test program is pre-programmed into the control module. After the control module is powered on, the pre-programmed test program is automatically started and executed, and the feedback data after the vehicle performs gear shifting is saved to the storage unit connected to the control module.

3. The microcontroller-based automotive gear shift function testing device according to claim 1, characterized in that, The vehicle gear shift function testing device also includes a host computer, which is used to control the gear shift operation by having the user input the gear shift control parameters of the gear shift combination, and to output the vehicle's gear shift execution status in real time on the display screen through the collected feedback signals.

4. The microcontroller-based automotive gear shift function testing device according to claim 3, characterized in that, The test process involves a multi-step loop by inputting a preset formatted instruction verification table, and the vehicle's gear position instructions are verified by recording the gear position signals fed back by the vehicle and combining them with the instruction verification table.

5. The microcontroller-based automotive gear shift function testing device according to claim 4, characterized in that, The instruction verification table includes: gear simulation control instructions listed in a predetermined order, and for each gear simulation control instruction, there are verification, completion, error and execution step information.

6. The microcontroller-based automotive gear shift function testing device according to any one of claims 1 to 5, characterized in that, When the feedback signal indicates that the gear operation is not performed according to the predetermined steps, the vehicle gear function testing device automatically controls the test vehicle to switch to P gear and outputs an alarm signal through a buzzer connected to the control module.

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