Accelerator pedal and gear combined control device and test method

Abstract

The invention discloses an accelerator pedal and gear combined control device and a test method, which are mainly characterized in that a single chip microcomputer communicated with an upper computer is utilized, and two paths of voltage signals are set and are used for being connected with an accelerator pedal opening signal wire harness of a real vehicle to simulate double paths of voltage for controlling the opening of the pedal; and two CAN channels are configured, one CAN channel is connected with a real vehicle gear signal wire harness to control the real vehicle to shift gears, and the other CAN channel is communicated with a real vehicle CAN network to collect real vehicle feedback information so as to verify test control. Specifically, gear and accelerator pedal control instructions are input and sent during testing, CAN signals fed back by a tested real vehicle are collected for each control instruction, whether execution of the control instructions is abnormal or not is judged based on the feedback signals, and the control instructions, execution conditions of the control instructions and corresponding timestamps of the control instructions are recorded in the testing process. Control linkage of the gear and the opening degree of the accelerator pedal is achieved in an efficient and low-cost mode, the control verification function is provided, and the vehicle type application range is wider.

Description

Technical Field

[0001] The invention relates to the field of automobile testing, and in particular to an accelerator pedal and gear position combined control device and a testing method. Background Art

[0002] The opening degree and gear position of the automobile accelerator pedal (referred to as the throttle in the present invention according to industry practice) are important factors in controlling the driving of the vehicle. In the existing testing technology, a professional driver is generally used for operation. The advantage of manual operation is that it has a high degree of freedom and can cope with various driving conditions. However, for some tests that are performed multiple times, the repeatability is poor. In continuous multiple tests, such as the throttle sweep test, it is necessary to consider that the driver cannot work continuously, resulting in low test efficiency.

[0003] Therefore, the industry also proposed to use the accelerator pedal limit device to control the accelerator pedal opening. During the test, the accelerator pedal is pressed down to limit the depth by adjusting the position of the positioning bolt. After several continuous adjustments, the accelerator pedal opening control under a certain opening is achieved. Then, the accelerator pedal position sensor signal is collected, and the controller receives the voltage signal generated by the accelerator pedal position sensor being triggered through the first wiring harness interface, and the test voltage signal generated by the second wiring harness interface according to the voltage signal is output to the vehicle ECU, completing the 5% incremental throttle opening control method.

[0004] As for car gear testing, there is also a plan to use a gear robot to replace the driver. Before each test, the gear robot needs to be assembled and configured, and the gear robot operating arm is connected to the car gear handle. The gear robot learns by manually changing the gear, and then controls the car gear.

[0005] After analyzing the above existing solutions, it is believed that there are at least the following deficiencies:

[0006] (1) It is impossible to realize the linkage between the vehicle gear position and the accelerator pedal opening control;

[0007] (2) Only 5% accelerator pedal control can be completed, and the accelerator pedal still needs to be stepped on;

[0008] (3) The lack of control result verification function caused the vehicle to fail to perform the test as expected;

[0009] (4) The single test conditions are limited and the test conditions need to be input multiple times, making it impossible to automate the test;

[0010] (5) The gear shifting mode cannot adapt to all car models. Summary of the invention

[0011] In view of the above, the present invention aims to provide an accelerator pedal and gear position combined control device and a testing method to solve the above-mentioned technical problems.

[0012] The technical solution adopted by the present invention is as follows:

[0013] In a first aspect, the present invention provides an accelerator pedal and gear position combined control device, comprising: a single chip microcomputer communicating with a host computer, the single chip microcomputer being configured with two digital-to-analog conversion voltage signal channels, the two voltage signal channels being used to be connected to an accelerator pedal opening signal harness of a real vehicle to simulate a dual voltage for controlling the accelerator pedal opening of the real vehicle;

[0014] In addition, the single-chip microcomputer is configured with a first CAN channel and a second CAN channel, wherein the first CAN channel is used to connect to the gear signal harness of the actual vehicle to control the gear shifting of the actual vehicle; the second CAN channel is used to communicate with the actual vehicle CAN network to collect actual vehicle feedback information for verifying the throttle and gear control signals.

[0015] In at least one possible implementation, the joint control device further includes a display screen connected to the single-chip computer by electrical signals, and the display screen is at least used to display a current accelerator pedal opening and a gear position.

[0016] In at least one possible implementation manner, the joint control device further includes a storage card electrically connected to the single chip computer, and the storage card is at least used to store the sent control information and the received feedback information.

[0017] In at least one possible implementation, the joint control device also includes a plurality of manual physical components connected to the single-chip computer electrical signal, and the manual physical components are used to manually input signals to control the accelerator pedal and gear shifting of the actual vehicle.

[0018] In a second aspect, the present invention further provides a testing method based on the above-mentioned joint control device, comprising:

[0019] Pre-calibrate the accelerator pedal opening and dual-circuit voltage and compile the shift message;

[0020] The actual vehicle to be tested is set on the chassis dynamometer, and the combined control device is connected to the accelerator pedal and the gear control harness of the actual vehicle to be tested;

[0021] Input and send the preset gear control command and accelerator pedal opening control command in the test target;

[0022] After each control command is issued, the CAN signal fed back by the actual vehicle under test is collected for verification; and based on the feedback signal, when it is determined that any control command is executed abnormally, the actual vehicle under test is triggered to stop running and output an alarm;

[0023] The execution status and execution time of the control instructions during the test process shall be recorded.

[0024] In at least one possible implementation method, the input and sending of preset gear control instructions and throttle pedal opening control instructions in the test target includes: inputting a test template file in a predetermined format into the host computer, and the single-chip microcomputer gradually outputs each control instruction in the order of the test steps in the test template file.

[0025] In at least one possible implementation, the accelerator pedal opening and dual-channel voltage calibration specifically includes: collecting dual-channel voltage values ​​at every preset control increment in the accelerator pedal opening range of 0%-100% through a real vehicle CAN signal, and performing curve fitting processing on the dual-channel voltage values;

[0026] The gear message compilation specifically includes: continuously collecting the gear CAN message of the actual vehicle, and recording the gear shift message at the current moment when the gear is changed, and compiling the gear shift message to simulate the gear signal of the actual vehicle.

[0027] Compared with the prior art, the main design concept of the present invention is to utilize a single-chip microcomputer that communicates with a host computer, configure it to have at least two digital-to-analog conversion voltage signals, which are used to connect to the accelerator pedal opening signal harness of a real vehicle to simulate the dual voltage of the control pedal opening; and configure dual CAN channels, one of which is used to connect to the gear signal harness of a real vehicle to control the gear shifting of the real vehicle, and the other is used to communicate with the CAN network of the real vehicle to collect real vehicle feedback information for verifying the execution of throttle and gear control. Specifically, during the test, the gear and accelerator pedal control instructions are input and sent, and the CAN signal fed back by the tested real vehicle is collected for each control instruction. Based on the feedback signal, it is determined whether the execution of the control instruction is abnormal, and the control instruction and its execution status and corresponding timestamp are recorded during the test. The present invention realizes the control linkage of the gear and accelerator pedal opening in an efficient and low-cost manner and provides a control verification function, and has a wider range of vehicle types. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0029] Figure 1 A schematic diagram of a framework of an accelerator pedal and gear position combined control device provided in an embodiment of the present invention;

[0030] Figure 2 A schematic flow chart of a testing method using a joint control device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0032] The present invention proposes an embodiment of an accelerator pedal and gear position combined control device. Specifically, Figure 1 As shown, a single-chip microcomputer (such as but not limited to STM32F407ZGT6) communicating with a host computer is provided with two digital-to-analog conversion voltage signal channels, and the two voltage signal channels are used to be connected to the accelerator pedal opening signal harness of a real vehicle to simulate the dual-channel voltage for controlling the accelerator pedal opening of the whole vehicle;

[0033] In addition, the single-chip microcomputer is configured with a first CAN channel and a second CAN channel, wherein the first CAN channel is used to connect to the gear signal harness of the actual vehicle to control the gear shifting of the actual vehicle; the second CAN channel is used to communicate with the actual vehicle CAN network to collect actual vehicle feedback information for verifying the throttle and gear control signals.

[0034] Regarding the working principle of the accelerator pedal involved in this device, the accelerator pedal converts the pedal depth signal into a dual-channel voltage signal output, and the dual-channel voltage signal is linearly related to the pedal depth signal, and the two-channel voltage has a linear relationship. Therefore, in actual operation, the dual-channel DAC channel of the microcontroller can be used to output the digital signal as a voltage signal, and the output range can be any voltage value within the preset range. At this time, it is only necessary to connect the two-channel voltage output in the accelerator pedal assembly interface to the dual-channel voltage channel of this device, so as to simulate the two-channel voltage signal of the accelerator pedal, and then simulate any accelerator pedal opening.

[0035] Regarding the whole vehicle gear control principle involved in this device, by operating the gear lever on the actual vehicle, the gear lever assembly will send a gear message when shifting gears. The gear message includes multiple information, including the gear shifter target gear information, the gear shifter target gear verification position information, and whether the gear shift is faulty. Therefore, in actual operation, the gear message in the original whole vehicle state is replaced by a CAN signal in the single-chip microcomputer to simulate the sending of the original whole vehicle gear message to achieve the function of controlling the whole vehicle gear; it can be supplemented that another CAN signal is responsible for collecting the whole vehicle feedback information, so as to verify the throttle pedal opening and gear control instructions issued by this device to ensure that the whole vehicle control is effectively completed.

[0036] Continuing from the above, in some embodiments of the present invention, the joint control device may also include a plurality of manual physical components connected to the electrical signals of the single-chip computer, and the manual physical components are used to replace the host computer to trigger the accelerator pedal and gear shifting of the actual vehicle.

[0037] That is, the combined control device proposed in the present invention, in addition to realizing automated testing by inputting control instructions such as the throttle pedal opening and gear combination into the host computer, also takes into account reducing dependence on the host computer. The combined control device is used alone to manually trigger the signal input through the buttons, keys, switches, knobs and other components thereon, and is processed by the single-chip microcomputer to control the throttle pedal opening and gear shifting.

[0038] In addition, in some other embodiments of the present invention, the combined control device further includes a display screen connected to the single-chip microcomputer by electrical signals, at least for displaying the current accelerator pedal opening and gear position. Based on this concept, the combined control device further includes a storage card (such as an SD card) connected to the single-chip microcomputer by electrical signals, for storing the control information sent and the feedback information received.

[0039] Corresponding to the above-mentioned device embodiments, the present invention also provides a testing method, such as Figure 2 As shown, including:

[0040] Step S1, pre-calibrating the accelerator pedal opening and the dual-circuit voltage and compiling the shift message;

[0041] To elaborate, the accelerator pedal opening and dual-channel voltage calibration specifically include: collecting the dual-channel voltage value at every preset increment of the accelerator pedal opening from 0% to 100% through the vehicle CAN signal, such as 5% opening, and inputting the value into the established calibration module in the host computer for curve fitting to complete the actual vehicle accelerator pedal calibration.

[0042] The gear message compilation specifically includes: collecting the gear CAN message of the actual vehicle, and recording the current gear shift message when changing the gear. Similarly, it can be compiled on the gear calibration module in the host computer to simulate the gear signal of the whole vehicle.

[0043] Step S2, placing the actual vehicle to be tested on the chassis dynamometer and establishing an electrical connection with the host computer, and connecting the joint control device to the accelerator pedal and gear control harness of the actual vehicle to be tested;

[0044] Regarding the layout of the actual vehicle under test, you can refer to the following: In a test room with a chassis dynamometer, use a vehicle binding device to fix the vehicle under test on the chassis dynamometer, and set the oncoming fan nozzle to face the vehicle under test. If the vehicle under test will produce exhaust gas, an exhaust gas extraction system can also be installed. After the above arrangement is completed, the host computer vehicle can be tested for a certain period of time to confirm that there are no abnormalities.

[0045] Step S3, inputting and sending the preset gear control instruction and accelerator pedal opening control instruction in the test target;

[0046] Specifically, the throttle and gear position can be controlled by inputting the required gear position and accelerator pedal opening into the host computer and sending them to the actual vehicle under test via the aforementioned single-chip microcomputer; of course, it can also be used to input a test template file in a predetermined format (such as Excel) into the host computer, which is used to step by step execute certain test processes with multiple steps according to the sequential logic in the file, such as step by step executing the throttle sweep test according to the predetermined accelerator pedal increment. As mentioned above, the joint control device can also work independently without relying on the host computer, for example, the accelerator pedal opening can be increased, decreased, reset to zero, and the gear position can be changed through the button group on the device.

[0047] For the sweep test mentioned here, the following example is provided for reference: turn off the vehicle creep function and under the premise of braking, input the forward gear control command and control the accelerator pedal to execute the corresponding opening according to the established control amount (such as 1%, 2% or 5%, etc.); and during the test, in the acceleration section, steady speed section and coasting deceleration section, respectively, feedback signals such as vehicle speed are collected through CAN signals to verify the established test targets to complete the test.

[0048] Step S4: After each control command is issued, the CAN signal fed back by the actual vehicle under test is collected for verification, and based on the feedback signal, it is determined that when any control command is abnormal, the upper computer triggers the actual vehicle under test to stop running and output an alarm;

[0049] Step S5: Record the execution status and execution time.

[0050] That is, when a control instruction fails to execute the operation according to the established steps, the host computer automatically controls the vehicle to stop and sends out an alarm signal, and records each control instruction and its execution status and time during the entire test process to form a log; more preferably, the display screen on the aforementioned device can prompt the test steps that are not currently executed and the reasons for them.

[0051] Finally, it can be added that during the test, a driver can be arranged in the actual vehicle under test, who mainly plays a role of safety monitoring and does not need to perform any operation on the vehicle under non-emergency conditions.

[0052] In summary, the main design concept of the present invention is to utilize a single-chip microcomputer that communicates with a host computer, configure it to have at least two digital-to-analog conversion voltage signals, which are used to connect to the accelerator pedal opening signal harness of a real vehicle to simulate the dual voltage of the control pedal opening; and configure dual CAN channels, one of which is used to connect to the gear signal harness of a real vehicle to control the gear shifting of the real vehicle, and the other is used to communicate with the CAN network of the real vehicle to collect real vehicle feedback information for verifying the execution of throttle and gear control. Specifically, during the test, the gear and accelerator pedal control instructions are input and sent, and the CAN signal fed back by the tested real vehicle is collected for each control instruction. Based on the feedback signal, it is determined whether the execution of the control instruction is abnormal, and the control instruction and its execution status and corresponding timestamp are recorded during the test. The present invention realizes the control linkage of the gear and accelerator pedal opening in an efficient and low-cost manner and provides a control verification function, and has a wider range of vehicle types.

[0053] If the expressions expressing orientation are mentioned in the embodiments of the present invention, they are relative concepts based on the embodiments. In addition, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in 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 be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c can be single or multiple.

[0054] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment 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 into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. An accelerator pedal and gear position combined control device, characterized in that: include: A single-chip microcomputer communicating with a host computer, wherein the single-chip microcomputer is configured with two digital-to-analog conversion voltage signal channels, and the two voltage signal channels are used to be connected to the accelerator pedal opening signal harness of a real vehicle to simulate a dual-channel voltage for controlling the accelerator pedal opening of a real vehicle; Furthermore, the single chip microcomputer is configured with a first CAN channel and a second CAN channel, wherein the first CAN channel is used to be connected to a gear position signal harness of a real vehicle to control gear shifting of the real vehicle; The second CAN channel is used to communicate with the real vehicle CAN network to collect real vehicle feedback information for verifying throttle and gear control signals.

2. The accelerator pedal and gear position combined control device according to claim 1, characterized in that: The combined control device also includes a display screen connected to the single-chip computer by electrical signals, and the display screen is at least used to display the current accelerator pedal opening and gear position.

3. The accelerator pedal and gear position combined control device according to claim 1, characterized in that: The joint control device further comprises a storage card electrically connected to the single chip computer, wherein the storage card is at least used to store the sent control information and the received feedback information.

4. The accelerator pedal and gear position combined control device according to any one of claims 1 to 3, characterized in that: The combined control device also includes a plurality of manual physical components connected to the single chip computer electrical signal, and the manual physical components are used to manually input signals to control the accelerator pedal and gear shifting of the actual vehicle.

5. A testing method for the combined control device according to any one of claims 1 to 4, characterized in that: include: Pre-calibrate the accelerator pedal opening and dual-circuit voltage and compile the shift message; The actual vehicle to be tested is set on the chassis dynamometer, and the combined control device is connected to the accelerator pedal and the gear control harness of the actual vehicle to be tested; Input and send the preset gear control command and accelerator pedal opening control command in the test target; After each control command is issued, the CAN signal fed back by the actual vehicle under test is collected for verification; and based on the feedback signal, when it is determined that any control command is executed abnormally, the actual vehicle under test is triggered to stop running and output an alarm; The execution status and execution time of the control instructions during the test process shall be recorded.

6. The testing method according to claim 5, characterized in that: The inputting and sending of preset gear control instructions and accelerator pedal opening control instructions in the test target includes: inputting a test template file in a predetermined format into the host computer, and the single-chip microcomputer gradually outputs each control instruction according to the test step sequence in the test template file.

7. The testing method according to claim 5 or 6, characterized in that: The accelerator pedal opening and dual-channel voltage calibration specifically includes: collecting dual-channel voltage values ​​at preset control increments in the accelerator pedal opening range of 0%-100% through a real vehicle CAN signal, and performing curve fitting processing on the dual-channel voltage values; The gear message compilation specifically includes: continuously collecting the gear CAN message of the actual vehicle, and recording the gear shift message at the current moment when the gear is changed, and compiling the gear shift message to simulate the gear signal of the actual vehicle.

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