Vehicle braking performance testing method, system, electronic device and storage medium

Abstract

The present invention provides a vehicle braking performance testing method, system, electronic device and storage medium. The method receives a first control instruction and controls a vehicle to be tested to perform an initial calibration test on a first road surface based on the first control instruction, thereby obtaining a calibrated pedal stroke parameter under a preset pedal force, and performs a driving brake test step to obtain a driving brake pedal stroke parameter, so as to determine a vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter. The present invention measures the brake pedal stroke parameter under test conditions such as vibration or continuous turning that cause brake clearance, and compares the parameter with the calibrated parameter, thereby effectively combining the pedal stroke and brake clearance data, ensuring that the detection of the brake system is more comprehensive, better reflecting the actual state of the brake system, helping to more accurately judge the health status of the brake system, and allowing for faster and more accurate maintenance and adjustment of the vehicle brake system.

Description

Technical Field

[0001] The present application relates to the field of vehicle safety, and in particular to a vehicle braking performance testing method, system, electronic device, and storage medium. Background Art

[0002] The automotive industry is moving toward high-quality development. With the increasing number of vehicles and technological innovation, the trends toward electrification, intelligence, connectivity, and sharing are deepening. While vehicle functionality has become increasingly complex, safety remains the most important consideration. The braking system is a core component for ensuring vehicle safety. Failures in any link, from the brake pedal to the tire, can lead to brake failure and accidents. Brake pads, critical components in the braking system, rub against the brake disc with each braking action, gradually wearing away, increasing the clearance between the pad and disc.

[0003] Brake clearance refers to the distance between the brake elements in a brake. In automobiles, this typically refers to the distance between the brake disc and brake caliper, or in drum brakes, the distance between the brake drum and brake shoe. Brake clearance becomes particularly noticeable after vibration or continuous cornering. When wear reaches a certain level, it must be replaced; otherwise, braking effectiveness will be significantly reduced, or even failure will occur, posing a serious safety hazard. However, existing vehicle brake-related testing and maintenance processes fail to integrate brake pedal travel with brake pad clearance data, resulting in incomplete coverage of vehicle braking system safety testing. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a vehicle braking performance testing method, system, electronic device and storage medium to solve the above technical problems.

[0005] The present invention provides a vehicle braking performance testing method, which includes: receiving a first control instruction, and controlling a vehicle to be tested to perform an initial calibration test on a first road surface based on the first control instruction, to obtain a calibrated pedal stroke parameter under a preset pedal force, wherein the vehicle to be tested includes a brake pedal, and the first control instruction includes a first pedal force increase speed; executing a driving braking test step to obtain a driving brake pedal stroke parameter, wherein the driving braking test step includes receiving a second control instruction, and controlling the vehicle to be tested to perform a driving test based on the second control instruction, wherein the second control instruction includes any one of a road condition test control instruction and a continuous turning test control instruction; when the controlled vehicle to be tested completes the driving test, receiving the first control instruction again, and controlling the vehicle to be tested to perform a braking test on the first road surface based on the first control instruction, to obtain a driving pedal stroke parameter under the preset pedal force; and determining a vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter.

[0006] In one embodiment of the present invention, after executing the driving braking test step, the vehicle braking performance test method further includes: executing the driving braking test step again, wherein the second control instruction is different from the second control instruction in the last execution of the driving braking test step, and the driving test includes a road condition driving test and a continuous turning driving test.

[0007] In one embodiment of the present invention, if the second control instruction includes a road condition test control instruction, the step of executing the driving braking test includes: receiving the road condition test control instruction, and controlling the vehicle to be tested to perform a road condition driving test on a second road surface based on the road condition test control instruction, wherein the bumpy state of the second road surface is stronger than the bumpy state of the first road surface, and the road condition test control instruction includes a first driving speed, a road condition driving distance, and a road condition driving end speed threshold; when the controlled vehicle to be tested completes the road condition driving test, the first control instruction is received again, and based on the first control instruction, the vehicle to be tested is controlled to perform a braking test on the first road surface to obtain the driving pedal stroke parameters under the preset pedal force.

[0008] In one embodiment of the present invention, if the second control instruction includes a continuous turning test control instruction, the step of executing the driving braking test includes: receiving the continuous turning test control instruction, and controlling the vehicle to be tested to perform a continuous turning driving test on a first road surface based on the continuous turning test control instruction, wherein the continuous turning test control instruction includes a second driving speed, a continuous turning duration, and a continuous turning driving end speed threshold; when the controlled vehicle to be tested completes the continuous turning driving test, receiving the first control instruction again, and controlling the vehicle to be tested to perform a braking test on the first road surface based on the first control instruction to obtain a driving pedal stroke parameter under a preset pedal force.

[0009] In one embodiment of the present invention, before determining the vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter, the vehicle braking performance test method further includes: repeatedly executing the driving braking test step with the same second control instruction at least twice to obtain at least two groups of initial driving pedal stroke parameters, and performing mean solution on the at least two groups of initial driving pedal stroke parameters to obtain the mean driving pedal stroke parameter; determining the target driving pedal stroke parameter in the at least two groups of initial driving pedal stroke parameters according to preset screening conditions, and determining the target driving pedal stroke parameter and the mean driving pedal stroke parameter as the driving pedal stroke parameter.

[0010] In one embodiment of the present invention, determining the vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter includes: determining a first difference between the target driving pedal stroke parameter and the calibrated pedal stroke parameter, and determining a second difference between the target driving pedal stroke parameter and the mean driving pedal stroke parameter; if the first difference and the second difference are both less than or equal to a preset driving braking difference threshold, the vehicle braking performance test result is that the braking performance impact is small; if at least one of the first difference and the second difference is greater than the preset driving braking difference threshold, the corresponding additional test strategy is matched according to the type of the second control instruction in the driving braking test step.

[0011] In one embodiment of the present invention, the corresponding additional test strategy is matched according to the type of the second control instruction in the driving braking test step, including: if the second control instruction includes a road condition test control instruction, the road condition test control instruction is updated with a preset additional test condition to obtain a new road condition test control instruction, and the driving braking test step is executed again based on the new road condition test control instruction to obtain a new driving pedal stroke parameter; a third difference between the new driving pedal stroke parameter and the target driving pedal stroke parameter is determined; if the third difference is less than or equal to the preset additional test difference threshold, a minimum braking test step is executed; if the third difference is greater than the preset additional test difference threshold, the vehicle braking performance test result is that the braking performance is greatly affected; if the second control instruction includes a continuous turning test control instruction, the minimum braking test step is executed.

[0012] In one embodiment of the present invention, the step of performing a minimum braking test includes: receiving a third control instruction, and controlling the vehicle to be tested to perform a minimum braking test on a first road surface based on the third control instruction to obtain a braking test distance, wherein the third control instruction includes a third pedal force, a third driving speed, a braking start speed threshold, and a braking start gear; determining a minimum braking difference based on the braking test distance and a preset minimum braking distance; if the minimum braking difference is greater than the preset minimum braking test threshold, the vehicle braking performance test result is that the braking performance has a large impact; if the minimum braking difference is less than the preset minimum braking test threshold, the vehicle braking performance test result is that the braking performance has a small impact.

[0013] An embodiment of the present invention also provides a vehicle braking performance testing system, which includes: a calibration test module, which is used to receive a first control instruction and control the vehicle to be tested to perform an initial calibration test on a first road surface based on the first control instruction to obtain a calibrated pedal stroke parameter under a preset pedal force, wherein the vehicle to be tested includes a brake pedal, and the first control instruction includes a first pedal force increase speed; a driving condition test module, which is used to execute a driving braking test step to obtain a driving brake pedal stroke parameter, wherein the driving braking test step includes receiving a second control instruction and controlling the vehicle to be tested to perform a driving test based on the second control instruction, wherein the second control instruction includes any one of a road condition test control instruction and a continuous turning test control instruction; when the controlled vehicle to be tested completes the driving test, the first control instruction is received again, and the vehicle to be tested is controlled to perform a braking test on the first road surface based on the first control instruction to obtain the driving pedal stroke parameter under the preset pedal force; a braking performance judgment module, which is used to determine the vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter.

[0014] An embodiment of the present invention also provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the electronic device implements the vehicle braking performance testing method as described in any one of the above embodiments.

[0015] An embodiment of the present invention further provides a computer-readable storage medium having computer-readable instructions stored thereon. When the computer-readable instructions are executed by a processor of a computer, the computer is caused to execute the vehicle braking performance testing method as described in any one of the above embodiments.

[0016] The present invention provides a vehicle braking performance testing method, system, electronic device and storage medium, which receive a first control instruction and control the vehicle to be tested to perform an initial calibration test on a first road surface based on the first control instruction to obtain a calibrated pedal stroke parameter under a preset pedal force, and perform a driving braking test step to obtain a driving brake pedal stroke parameter, so as to determine the vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter; the present invention measures the brake pedal stroke parameter under test conditions such as vibration or continuous turning that cause brake clearance, and compares it with the calibrated pedal stroke parameter, effectively combining the pedal stroke and brake clearance data, ensuring that the detection of the braking system is more comprehensive and can better reflect the actual state of the braking system, not only focusing on the braking performance under static conditions, but also considering the braking effect under dynamic conditions, which helps to more accurately judge the health status of the braking system and can more quickly and accurately perform maintenance and adjustment of the vehicle braking system.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, serving to explain the principles of the present application. It is obvious that the drawings described below are merely some embodiments of the present application, and a person of ordinary skill in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0019] Figure 1 is a schematic diagram of an exemplary system architecture shown in an exemplary embodiment of the present application;

[0020] Figure 2 This is a flow chart of a vehicle braking performance testing method shown in an exemplary embodiment of the present application;

[0021] Figure 3 1 is a schematic diagram of a vehicle braking performance testing system shown in an exemplary embodiment of the present application;

[0022] Figure 4 It is a structural diagram of a computer system of an electronic device shown in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will describe embodiments of the present invention with reference to the accompanying drawings and specific embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0024] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0025] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring the embodiments of the present invention.

[0026] The term "and / or" used in this application describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0027] Figure 1 It is a schematic diagram of an exemplary system architecture shown in an exemplary embodiment of the present application.

[0028] Reference Figure 1As shown, the system architecture may include a vehicle to be tested 110 and a computer device 120. The computer device 120 establishes a communication connection with the vehicle to be tested 110 and issues a first control instruction. The vehicle to be tested 110 receives the first control instruction and controls the vehicle to be tested to perform an initial calibration test on a first road surface based on the first control instruction, thereby obtaining a calibrated pedal stroke parameter under a preset pedal force. The vehicle to be tested includes a brake pedal. The first control instruction includes a first pedal force increase speed. A driving brake test step is performed to obtain a driving brake pedal stroke parameter. The driving brake test step includes receiving a second control instruction and controlling the vehicle to be tested to perform a driving test based on the second control instruction. The second control instruction includes any one of a road condition test control instruction and a continuous turning test control instruction. When the vehicle to be tested completes the driving test, the first control instruction is received again, and the vehicle to be tested is controlled to perform a braking test on the first road surface based on the first control instruction, thereby obtaining a driving pedal stroke parameter under a preset pedal force. The vehicle braking performance test result is determined based on the calibrated pedal stroke parameter and the driving pedal stroke parameter. The computer device 120 may be at least one of a microcomputer, an embedded computer, a network computer, a single-chip microcomputer, and the like. The vehicle to be tested 110 may include at least a brake pedal and a sensing device, wherein the sensing device includes but is not limited to a driving data collector, a pedal force sensor, a pedal travel sensor, a speedometer, an accelerometer, and the like.

[0029] Schematically, the computer device 120 sends a first control instruction after establishing a communication connection with the vehicle to be tested 110. The vehicle to be tested 110 receives the first control instruction and, based on the first control instruction, controls the vehicle to be tested to perform an initial calibration test on a first road surface, obtains a calibrated pedal stroke parameter under a preset pedal force, and performs a driving brake test step to obtain a driving brake pedal stroke parameter, so as to determine the vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter; the present invention measures the brake pedal stroke parameter under test conditions that cause brake clearance, such as vibration or continuous turning, and compares it with the calibrated pedal stroke parameter, thereby effectively combining the pedal stroke and brake clearance data, ensuring that the detection of the braking system is more comprehensive and can better reflect the actual state of the braking system. It not only focuses on the braking performance under static conditions, but also considers the braking effect under dynamic conditions, which helps to more accurately judge the health status of the braking system and can more quickly and accurately perform maintenance and adjustment of the vehicle braking system.

[0030] It should be noted that in the examples of this application, the test conditions include good visibility, such as no rain, fog, or snow, and a dry, clean test road. If the Belgian road surface is used, the test conditions are preferably circular, and if the straight road is as long as possible to ensure continuous excitation. In particular, if the asphalt road surface is used, the adhesion coefficient should be between 0.7 and 0.8.

[0031] Figure 2 This is a flow chart of a vehicle braking performance test method shown in an exemplary embodiment of the present application. The vehicle braking performance test method can be Figure 1 The implementation environment can be implemented in other implementation environments, and the above implementation environment is not specifically limited here. Figure 2 As shown, the flowchart of the vehicle braking performance test method includes at least steps S210 to S230, which are described in detail as follows:

[0032] In step S210, a first control instruction is received, and based on the first control instruction, the vehicle to be tested is controlled to perform an initial calibration test on a first road surface to obtain a calibrated pedal stroke parameter under a preset pedal force.

[0033] In one embodiment of the present application, the vehicle to be tested includes a brake pedal, and the first control instruction includes, but is not limited to, a first pedal force increase rate. In this embodiment of the present application, the first pedal force increase rate is selected to be (50±10) N / s, and one possible implementation of the preset pedal force is to select a pedal travel parameter corresponding to a pedal force of 90 N. In this embodiment of the present application, the first road surface is a flat asphalt road surface; in other embodiments, a flat road surface such as a concrete road surface may also be selected.

[0034] In one embodiment of the present application, a preferred test condition for the test vehicle is a passenger vehicle with 3,000-10,000 kilometers of mileage, with the brake pads and discs having been properly run-in. The test mass should be between the curb weight and the maximum design mass, and the tire pressure should be within the manufacturer's specified value ±10 kPa. Any load, if any, should be evenly distributed across the seats and trunk, and the axle load should be measured and recorded.

[0035] In one embodiment of the present application, the vehicle to be tested is further equipped with a pedal force sensor, a pedal travel sensor, a speedometer, an accelerometer, etc., wherein the accuracy of the pedal force sensor in the range of (0-1000)N is not less than 1% of the maximum range; the accuracy of the pedal travel sensor in the range of (0-150)mm is not less than 1% of the maximum range; the accuracy of the speedometer in the range of (0-150)km / h is not less than 1% of the maximum range; the accuracy of the accelerometer in the range of (-12-12)m / s2 is not less than 1% of the maximum range; the accuracy of the thermometer or thermocouple in the range of (0-400)℃ is within ±2℃. Component requirements include preparing a normal new car run-in and 80% worn brake pads, wherein the 80% wear should be mechanically parallel cut to the corresponding thickness to quickly simulate the state of the brake shoe after wear. Among them, the 80% worn parts can be run-in in one of the following ways after cutting:

[0036] 1) In accordance with the requirements of national standard GB 21670;

[0037] 2) According to the manufacturer's (vehicle instruction manual) regulations;

[0038] 3) Run-in the vehicle 80 times at a speed of 80 km / h to 30 km / h and a deceleration of 0.3g. The maximum temperature of the front wheel during each braking process shall not exceed 100°C.

[0039] 4) Brake 15 times continuously at a speed from 100 km / h to 0 km / h with full force (brake pedal force > 700N).

[0040] In a specific embodiment of the present application, the test vehicle is driven normally and stopped on a flat road surface, and an initial calibration test is performed. After confirming that the channel data corresponding to each sensor is cleared, the brake pedal is pressed at a uniform speed of (50±10)N / s. When the maximum stroke is reached, the test vehicle stops and the calibration pedal stroke parameters are recorded.

[0041] In order to make the test data more accurate, it is preferred to repeat the above initial calibration test twice, with the time interval between each test being approximately 2 minutes (to confirm the normal operation of the power assist system). After recording and saving 3 sets of data, the average value is calculated to obtain the calibrated pedal stroke parameters under the preset pedal force.

[0042] In one embodiment of the present application, recording and calibrating pedal stroke parameters includes finding the pedal stroke parameters corresponding to the preset pedal force in the rising section of the time synchronization diagram or the pedal stroke and pedal force curve diagram, for example, the pedal stroke parameters corresponding to 90N are taken in the embodiment of the present application.

[0043] In step S220, a driving brake test step is performed to obtain a driving brake pedal stroke parameter.

[0044] In one embodiment of the present application, the driving braking test step includes receiving a second control instruction and controlling the vehicle to be tested to perform a driving test based on the second control instruction, wherein the second control instruction includes any one of a road condition test control instruction and a continuous turning test control instruction.

[0045] In one embodiment of the present application, when the vehicle to be tested completes the driving test, it receives the first control instruction again, and based on the first control instruction, controls the vehicle to be tested to perform a braking test on the first road surface to obtain the driving pedal stroke parameters under the preset pedal force.

[0046] In one embodiment of the present application, after executing the driving braking test step, the driving braking test step is executed again, wherein the second control instruction is different from the second control instruction in the last execution of the driving braking test step, and the driving test includes a road condition driving test and a continuous turning driving test.

[0047] In one embodiment of the present application, if the second control instruction includes a road condition test control instruction, the step of executing the driving braking test includes receiving the road condition test control instruction, and controlling the vehicle to be tested to perform a road condition driving test on a second road surface based on the road condition test control instruction, the bumpy state of the second road surface is stronger than the bumpy state of the first road surface, the road condition test control instruction includes a first driving speed, a road condition driving distance, and a road condition driving end speed threshold. When the vehicle to be tested completes the road condition driving test, the first control instruction is received again, and based on the first control instruction, the vehicle to be tested is controlled to perform a braking test on the first road surface to obtain the driving pedal stroke parameters under the preset pedal force.

[0048] In a specific embodiment of the present application, the second road surface is a Belgian road surface, which generally refers to a road surface paved with cobblestones or other irregularly shaped stones. The road surface provides a natural texture that helps to improve friction.

[0049] In one embodiment of the present application, the preferred value of the first driving speed is 50 km / h ± 2 km / h, the preferred value of the road condition driving distance is 5 km, and the preferred value of the road condition driving end speed threshold is 15 km / h. The second road surface may also be a cobblestone road with a high degree of bumpiness, a washboard road, a fish scale pit road, a grass brick road, or the like.

[0050] In a specific embodiment of the present application, a vehicle enters a Belgian road and accelerates to 50 km / h ± 2 km / h, traveling at a constant speed for 5 km. The service and parking brakes are not allowed to be applied during the driving process. The accelerator pedal is adjusted to stabilize the vehicle speed. At the end of the driving process, the accelerator pedal is gradually released until the speed drops to 15 km / h. The vehicle exits the Belgian road, shifts into neutral, and coasts to a complete stop. During this process, the service and parking brakes are not applied. After confirming that the channel data corresponding to each sensor has been cleared, a braking test is performed, including depressing the brake pedal at a constant speed of (50 ± 10) N / s, stopping at maximum travel, and reading the driving pedal travel parameters under the preset pedal force. Specifically, in order to improve the validity of the data, the above-mentioned driving braking test steps are repeated 3 times, with the time interval between each test being approximately 2 minutes. 4 sets of data are recorded and saved, and the driving pedal stroke parameters corresponding to a pedal force of 90N are found in the rising section of the time synchronization diagram or the pedal stroke and pedal force curve diagram. The driving pedal stroke parameters of the first set of data are determined as the target driving pedal stroke parameters, and the pedal strokes of the next three sets of data are averaged to obtain the mean driving pedal stroke parameters.

[0051] In one embodiment of the present application, if the second control instruction includes a continuous turning test control instruction, the step of executing the driving braking test includes: receiving the continuous turning test control instruction, and controlling the vehicle to be tested to perform a continuous turning driving test on a first road based on the continuous turning test control instruction, the continuous turning test control instruction includes a second driving speed, a continuous turning duration, and a continuous turning driving end speed threshold; when the vehicle to be tested completes the continuous turning driving test, the first control instruction is received again, and based on the first control instruction, the vehicle to be tested is controlled to perform a braking test on the first road to obtain the driving pedal stroke parameters under the preset pedal force.

[0052] In one embodiment of the present application, the second driving speed is determined by turning left or right while idling, gradually increasing the vehicle speed after turning to the extreme angle, and recording the corresponding second driving speed when the lateral acceleration reaches 0.5g to 0.75g. The continuous turning duration is actually set according to the turning form. For example, in the embodiment of the present application, a figure-8 operation is performed for a total of 6 turns, or a figure-8 operation is performed for 6 turns to the left and right. The preferred value of the continuous turning end speed threshold in the embodiment of the present application is 15km / h.

[0053] In a specific embodiment of the present application, the starting direction of the turn is not limited to left or right. The vehicle is accelerated to the second driving speed and performs a figure-8 operation. After a total of 6 turns, the figure-8 operation is exited. The accelerator pedal is released, and the vehicle speed is reduced to 15 km / h. The vehicle is engaged in neutral gear and the vehicle coasts to a complete stop. During this process, the service brake and parking brake must not be operated. After confirming that the channel data corresponding to each sensor is cleared, a brake test is performed, including uniformly depressing the brake pedal at a pedal speed of (50±10) N / s, stopping at the maximum stroke, and reading the driving pedal stroke parameter under a preset pedal force. Specifically, to improve data validity, the above driving brake test steps are repeated three times, with an interval of approximately 2 minutes between each test. Four sets of data are recorded and saved. The driving pedal stroke parameter corresponding to a pedal force of 90 N is found in the rising section of the time synchronization graph or the pedal stroke and pedal force curve graph. The driving pedal stroke parameter of the first set of data is determined as the target driving pedal stroke parameter. The pedal stroke of the next three sets of data is averaged to obtain the average driving pedal stroke parameter.

[0054] In one embodiment of the present application, in order to make the test data more representative, the driving braking test step with the same second control instruction is repeated at least twice to obtain at least two groups of initial driving pedal stroke parameters, and the mean of the at least two groups of initial driving pedal stroke parameters is solved to obtain the mean driving pedal stroke parameter; the target driving pedal stroke parameter is determined according to the preset screening conditions in the at least two groups of initial driving pedal stroke parameters, and the target driving pedal stroke parameter and the mean driving pedal stroke parameter are determined as the driving pedal stroke parameter.

[0055] In step S230 , a vehicle braking performance test result is determined based on the calibration pedal travel parameter and the driving pedal travel parameter.

[0056] In one embodiment of the present application, a first difference between the target travel pedal stroke parameter and the calibrated travel pedal stroke parameter is determined, and a second difference between the target travel pedal stroke parameter and the mean travel pedal stroke parameter is determined.

[0057] If the first difference and the second difference are both less than or equal to the preset driving braking difference threshold, the vehicle braking performance test result is that the braking performance is little affected.

[0058] The preset driving brake difference threshold is a critical value of the pedal stroke increase corresponding to the preset pedal force in the driving brake test, and is the pedal stroke increase corresponding to the preset pedal force when the brake pad is worn to 80%.

[0059] Among them, the calculation method of the preset driving braking difference threshold when the second control instruction is a road condition test control instruction includes: after the new car that has been normally run-in (including the braking system) completes the road condition driving test, the first pedal stroke increase corresponding to the preset pedal force is obtained, the brake shoe simulating 100% wear is replaced, and after running-in according to the method of simulating 80% wear, the road condition driving test is completed to obtain the second pedal stroke increase corresponding to the preset pedal force, wherein the difference between the first pedal stroke increase and the second pedal stroke increase is the preset driving braking difference threshold.

[0060] Among them, the calculation method of the preset driving braking difference threshold when the second control instruction is a continuous turning test control instruction includes: after the new car that has been normally run-in (including the braking system) completes the continuous turning driving test, the third pedal stroke increase corresponding to the preset pedal force is obtained, the brake shoe simulating 100% wear is replaced, and after running-in according to the method of simulating 80% wear, the continuous turning driving test is completed to obtain the fourth pedal stroke increase corresponding to the preset pedal force, wherein the difference between the third pedal stroke increase and the fourth pedal stroke increase is the preset driving braking difference threshold.

[0061] If at least one of the first difference and the second difference is greater than the preset driving braking difference threshold, a corresponding additional test strategy is matched according to the type of the second control instruction in the driving braking test step.

[0062] When a corresponding additional test strategy is matched based on the type of the second control instruction in the driving braking test step, if the second control instruction includes a road condition test control instruction, the road condition test control instruction is updated with a preset additional test condition to obtain a new road condition test control instruction. The driving braking test step is then executed again based on the new road condition test control instruction to obtain a new driving pedal stroke parameter, and a third difference between the new driving pedal stroke parameter and the target driving pedal stroke parameter is determined. The predicted additional test condition includes at least doubling the road condition driving distance.

[0063] If the third difference is less than or equal to the preset additional test difference threshold, the minimum braking test step is executed; if the third difference is greater than the preset additional test difference threshold, the vehicle braking performance test result is that the braking performance is greatly affected.

[0064] When the corresponding additional test strategy is matched according to the type of the second control instruction in the driving braking test step, if the second control instruction includes a continuous turning test control instruction, the minimum braking test step is executed.

[0065] In one embodiment of the present application, performing the minimum braking test step includes receiving a third control instruction, and based on the third control instruction, controlling the vehicle to be tested to perform a minimum braking test on a first road surface to obtain a braking test distance, the third control instruction includes a third pedal force, a third driving speed, a braking start speed threshold, and a braking start gear, and determining the minimum braking difference based on the braking test distance and the preset minimum braking distance.

[0066] In one embodiment of the present application, the preferred value of the third driving speed is above 105 km / h, the preferred value of the braking start speed threshold is 100 km / h±1 km / h, the braking start gear is preferably neutral, and the preferred value of the third pedal force is no more than 500 N.

[0067] In a specific embodiment of the present application, the minimum braking test includes driving the vehicle to an asphalt road of a sufficiently long distance, confirming that the channel data corresponding to each sensor is cleared, driving the vehicle rapidly to a speed of more than 105 km / h, shifting to neutral, coasting to 100 km / h±1 km / h, and steadily braking the vehicle to a complete stop with a pedal force of no more than 500 N to obtain the test distance, and correcting it to the distance after the initial speed of 100 km / h, repeating the minimum braking test, recording at least 3 sets of data with an error within 3%, and calculating the average value to obtain the braking test distance and save it.

[0068] It should be noted that before the test, the temperature of the brake disc should be confirmed to be between 65℃ and 100℃ using a thermometer or thermocouple. If it is lower than 65℃, it can be heated by stepping on the brakes. If it is higher than 100℃, it should be cooled to between 65℃ and 100℃ by air cooling (normal driving or stationary).

[0069] If the minimum braking difference is greater than the preset minimum braking test threshold, the vehicle braking performance test result is that the braking performance is greatly affected.

[0070] If the minimum braking difference is less than the preset minimum braking test threshold, the vehicle braking performance test result is that the braking performance impact is small.

[0071] The present invention provides a vehicle braking performance testing method, system, electronic device and storage medium, which receive a first control instruction and control the vehicle to be tested to perform an initial calibration test on a first road surface based on the first control instruction to obtain a calibrated pedal stroke parameter under a preset pedal force, and perform a driving braking test step to obtain a driving brake pedal stroke parameter, so as to determine the vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter; the present invention measures the brake pedal stroke parameter under test conditions such as vibration or continuous turning that cause brake clearance, and compares it with the calibrated pedal stroke parameter, effectively combining the pedal stroke and brake clearance data, ensuring that the detection of the braking system is more comprehensive and can better reflect the actual state of the braking system, not only focusing on the braking performance under static conditions, but also considering the braking effect under dynamic conditions, which helps to more accurately judge the health status of the braking system and can more quickly and accurately perform maintenance and adjustment of the vehicle braking system.

[0072] The following describes a system embodiment of the present application, which can be used to perform the vehicle braking performance test method in the above-mentioned embodiment of the present application. For details not disclosed in the system embodiment of the present application, please refer to the embodiment of the vehicle braking performance test method in the above-mentioned embodiment of the present application.

[0073] Figure 3 This is a schematic diagram of a vehicle braking performance test system shown in an exemplary embodiment of the present application. The system can be applied to Figure 2 The method implementation process shown in the figure can be based on Figure 1 The system is executed in the implementation environment shown in the figure, and may also be applicable to other exemplary implementation environments and specifically configured in other devices. This embodiment does not limit the implementation environment to which the system is applicable.

[0074] like Figure 3 As shown, the exemplary vehicle braking performance testing system includes: a whole vehicle detection control module 301, a whole vehicle detection execution module 302, and a detection result determination module 303.

[0075] Among them, the calibration test module 301 is used to receive a first control instruction, and control the vehicle to be tested to perform an initial calibration test on a first road surface based on the first control instruction, and obtain a calibration pedal stroke parameter under a preset pedal force. The vehicle to be tested includes a brake pedal, and the first control instruction includes a first pedal force increase speed; the driving condition test module 302 is used to execute a driving braking test step to obtain a driving brake pedal stroke parameter. The driving braking test step includes receiving a second control instruction, and controlling the vehicle to be tested to perform a driving test based on the second control instruction. The second control instruction includes any one of a road condition test control instruction and a continuous turning test control instruction; when the vehicle to be tested is controlled to complete the driving test, the first control instruction is received again, and the vehicle to be tested is controlled to perform a braking test on the first road surface based on the first control instruction to obtain the driving pedal stroke parameter under the preset pedal force; the braking performance judgment module 303 is used to determine the vehicle braking performance test result based on the calibration pedal stroke parameter and the driving pedal stroke parameter.

[0076] An embodiment of the present application also provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, wherein when the one or more programs are executed by one or more processors, the electronic device implements the vehicle braking performance testing method provided in the above-mentioned embodiments.

[0077] Figure 4 This is a schematic diagram of the structure of a computer system of an electronic device according to an exemplary embodiment of the present application. Figure 4 The computer system 400 of the electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0078] like Figure 4 As shown, computer system 400 includes a central processing unit (CPU) 401, which can perform various appropriate actions and processes according to the program stored in read-only memory (ROM) 402 or the program loaded from the storage portion into random access memory (RAM) 403, such as the method for executing the above embodiment. Various programs and data required for system operation are also stored in RAM 403. CPU 401, ROM 402 and RAM 403 are connected to each other via a bus. Input / output (I / O) interface 405 is also connected to bus 404.

[0079] The following components are connected to the I / O interface 405: an input section 406 including a keyboard, a mouse, etc.; an output section 407 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 408 including a hard disk; and a communication section 409 including a network interface card such as a LAN (Local Area Network) card or a modem. The communication section performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface 405 as needed. Removable media 411, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., are installed in the drive 410 as needed so that computer programs read therefrom can be installed into the storage section 408 as needed.

[0080] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 409, and / or installed from a removable medium 411. When the computer program is executed by the central processing unit (CPU) 401, the various functions defined in the system of the present application are executed.

[0081] It should be noted that the computer-readable medium shown in the embodiment of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable computer program. This propagated data signal can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. A computer program embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, or any suitable combination thereof.

[0082] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. Among them, each box in the flowchart or block diagram can represent a module, program segment, or part of the code, and the above-mentioned module, program segment, or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0083] In the corresponding drawings of the above embodiments, connecting lines can represent the connection relationship between various components to represent more constituent signal paths (constituent_signalpath) and / or one or more ends of some lines have arrows to indicate the main information flow direction. The connecting lines serve as an identifier and are not a limitation to the scheme itself. Instead, the use of these lines in combination with one or more exemplary embodiments helps to connect circuits or logic units more easily. Any represented signal (determined by design requirements or preferences) may actually include one or more signals that can be transmitted in any direction and can be implemented with any appropriate type of signal scheme.

[0084] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. In some cases, the names of these units do not constitute limitations on the units themselves.

[0085] Another aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the aforementioned method. The computer-readable storage medium may be included in the electronic device described in the above embodiments, or may exist independently and not be incorporated into the electronic device.

[0086] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiment of the application, the features and functions of two or more modules or units described above can be concretized in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0087] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.

[0088] It should be noted that the present application can be used in a wide variety of general-purpose or special-purpose computing system environments or configurations, such as personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above, and the like.

[0089] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

[0090] It should be understood that the above content of this application is only a preferred exemplary embodiment of this application and is not intended to limit the implementation scheme of this application. Ordinary technicians in this field can easily make corresponding changes or modifications based on the main concept and spirit of this application. Therefore, the scope of protection of this application should be the scope of protection required by the claims.

Claims

1. A vehicle braking performance testing method, characterized in that: The vehicle braking performance testing method comprises: receiving a first control instruction and, based on the first control instruction, controlling a vehicle to be tested to perform an initial calibration test on a first road surface to obtain a calibrated pedal travel parameter under a preset pedal force, wherein the vehicle to be tested includes a brake pedal and the first control instruction includes a first pedal force increase rate; executing a driving brake test step to obtain a driving brake pedal stroke parameter, the driving brake test step comprising receiving a second control instruction and controlling the vehicle to be tested to perform a driving test based on the second control instruction, the second control instruction comprising any one of a road condition test control instruction and a continuous turning test control instruction; after the vehicle to be tested completes the driving test, receiving the first control instruction again, and controlling the vehicle to be tested to perform a braking test on a first road surface based on the first control instruction, to obtain a driving pedal stroke parameter under a preset pedal force; A vehicle braking performance test result is determined based on the calibrated pedal stroke parameter and the driving pedal stroke parameter.

2. The vehicle braking performance testing method according to claim 1, characterized in that: After performing the driving brake test step, the vehicle braking performance test method further includes: The driving brake test step is executed again, wherein the second control instruction is different from the second control instruction in the last driving brake test step, and the driving test includes a road condition driving test and a continuous turning driving test.

3. The vehicle braking performance testing method according to claim 2, characterized in that: If the second control instruction includes a road condition test control instruction, the step of performing the driving brake test includes: receiving a road condition test control instruction, and controlling the vehicle to be tested to perform a road condition driving test on a second road surface based on the road condition test control instruction, wherein the bumpiness of the second road surface is stronger than that of the first road surface, the road condition test control instruction including a first driving speed, a road condition driving distance, and a road condition driving end speed threshold; When the vehicle to be tested completes the road condition driving test, it receives the first control instruction again, and controls the vehicle to be tested to perform a braking test on the first road surface based on the first control instruction to obtain a driving pedal stroke parameter under a preset pedal force.

4. The vehicle braking performance testing method according to claim 2, characterized in that: If the second control instruction includes a continuous turning test control instruction, the step of performing the driving braking test includes: receiving a continuous turning test control instruction, and controlling the vehicle to be tested to perform a continuous turning driving test on a first road based on the continuous turning test control instruction, wherein the continuous turning test control instruction includes a second driving speed, a continuous turning duration, and a continuous turning driving end speed threshold; When the vehicle to be tested completes the continuous turning driving test, it receives the first control instruction again, and controls the vehicle to be tested to perform a braking test on the first road surface based on the first control instruction to obtain a driving pedal stroke parameter under a preset pedal force.

5. The vehicle braking performance testing method according to claim 1, characterized in that: Before determining the vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter, the vehicle braking performance test method further includes: Repeating the driving brake test step with the same second control instruction at least twice to obtain at least two sets of initial driving pedal stroke parameters, and performing mean value calculation on the at least two sets of initial driving pedal stroke parameters to obtain a mean driving pedal stroke parameter; A target driving pedal stroke parameter is determined according to a preset screening condition in at least two groups of initial driving pedal stroke parameters, and the target driving pedal stroke parameter and the average driving pedal stroke parameter are determined as the driving pedal stroke parameter.

6. The vehicle braking performance testing method according to claim 5, characterized in that: Determining a vehicle braking performance test result based on the calibrated pedal stroke parameter and the driving pedal stroke parameter includes: determining a first difference between the target travel pedal stroke parameter and the calibrated travel pedal stroke parameter, and determining a second difference between the target travel pedal stroke parameter and the mean travel pedal stroke parameter; If the first difference and the second difference are both less than or equal to the preset driving braking difference threshold, the vehicle braking performance test result is that the braking performance impact is small; If at least one of the first difference and the second difference is greater than a preset driving braking difference threshold, a corresponding additional test strategy is matched according to the type of the second control instruction in the driving braking test step.

7. The vehicle braking performance testing method according to claim 6, characterized in that: The additional test strategies corresponding to the type of the second control instruction in the driving brake test step include: If the second control instruction includes a road condition test control instruction, the road condition test control instruction is updated with a preset additional test condition to obtain a new road condition test control instruction, and the driving brake test step is performed again based on the new road condition test control instruction to obtain a new driving pedal stroke parameter; a third difference between the new driving pedal stroke parameter and the target driving pedal stroke parameter is determined; if the third difference is less than or equal to a preset additional test difference threshold, a minimum braking test step is performed; if the third difference is greater than the preset additional test difference threshold, the vehicle braking performance test result is that the braking performance is greatly affected; If the second control instruction includes a continuous turning test control instruction, a minimum braking test step is performed.

8. The vehicle braking performance testing method according to claim 7, characterized in that: The steps for performing a minimum brake test include: receiving a third control instruction, and controlling the vehicle to be tested to perform a minimum braking test on a first road surface based on the third control instruction to obtain a braking test distance, wherein the third control instruction includes a third pedal force, a third driving speed, a braking start speed threshold, and a braking start gear; determining a minimum braking difference based on the braking test distance and a preset minimum braking distance; If the minimum braking difference is greater than the preset minimum braking test threshold, the vehicle braking performance test result is that the braking performance has a large impact; if the minimum braking difference is less than the preset minimum braking test threshold, the vehicle braking performance test result is that the braking performance has a small impact.

9. A vehicle braking performance testing system, characterized in that: The vehicle braking performance testing system comprises: a calibration test module, configured to receive a first control instruction and, based on the first control instruction, control a vehicle to be tested to perform an initial calibration test on a first road surface to obtain a calibrated pedal travel parameter under a preset pedal force, wherein the vehicle to be tested includes a brake pedal and the first control instruction includes a first pedal force increase rate; A driving condition test module is configured to execute a driving brake test step to obtain a driving brake pedal stroke parameter, wherein the driving brake test step includes receiving a second control instruction and controlling the vehicle to be tested to perform a driving test based on the second control instruction, wherein the second control instruction includes any one of a road condition test control instruction and a continuous turning test control instruction; after controlling the vehicle to be tested to complete the driving test, the module again receives a first control instruction and controls the vehicle to be tested to perform a braking test on a first road surface based on the first control instruction to obtain a driving pedal stroke parameter under a preset pedal force; The braking performance determination module is configured to determine a vehicle braking performance test result based on the calibration pedal stroke parameter and the driving pedal stroke parameter.

10. An electronic device, characterized in that: It comprises a processor, a memory and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute the computer program stored in the memory to implement the vehicle braking performance test method according to any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that A computer program is stored thereon, and the computer program is used to enable a computer to execute the vehicle braking performance testing method according to any one of claims 1 to 8.

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