Vehicle braking performance evaluation method, device, equipment and readable storage medium

Abstract

The present invention provides a vehicle braking performance evaluation method, device, equipment and readable storage medium. The vehicle braking performance evaluation method includes: when the vehicle is ignited and the vacuum pump is at the maximum vacuum degree, multiple braking tests are performed on the vehicle; wherein one braking test is to control the vehicle to perform a preset number of braking actions in a preset cycle, and the length of the preset cycle of each braking test gradually increases; the minimum vacuum degree and the maximum pedal force of each braking test are obtained; the relationship curve between the preset cycle and the minimum vacuum degree, and the relationship curve between the preset cycle and the maximum pedal force are fitted to evaluate the braking performance of the vehicle. Through the present invention, the cycle of continuous braking in each braking test is gradually increased to obtain the pedal force of the vehicle at different vacuum degrees, and curve fitting is performed, so that the braking performance of the vacuum boosting system of the vehicle under continuous braking can be intuitively evaluated.

Description

Technical Field

[0001] The present invention relates to the field of automobile safety and vehicle testing technology, and in particular to a vehicle braking performance evaluation method, device, equipment and a readable storage medium. Background Art

[0002] In order to improve the braking performance of the car and improve the brake pedal feel, the braking systems of modern passenger cars and light commercial vehicles generally use vacuum assisted braking systems. The vacuum chamber of the vacuum assisted system needs to maintain a certain vacuum degree in order to output brake assistance to the outside. The vacuum pump's ability to draw vacuum directly affects the braking operating performance. Improving the vacuum pump's vacuuming performance can optimize the brake pedal feel and operability, thereby obtaining an ideal brake pedal feel.

[0003] At present, in the test of the vacuum pumping capacity of the automobile vacuum booster system, Chapter 4.1.1 of the automobile industry standard QCT-1004 stipulates the vacuum pumping time required for the electronic vacuum pump to reach different vacuum degrees at different test environment temperatures. Chapter C2.1.2.1 of the national standard GB12676 puts forward requirements for the performance of the vacuum pump: After the following operations, the energy storage device of the motor vehicle shall ensure that the specified emergency braking performance is achieved: When the vacuum pump is used as the energy source, the service brake device is actuated eight times with full stroke. In the above standards, QCT-1004 only stipulates the bench test of the vacuum pump, and GB12676 also only stipulates the minimum working performance of the vacuum pump. Continuous braking of the vehicle often occurs in actual operation. When the vehicle brakes, the vacuum pump will consume vacuum while the vehicle brakes. If the vacuum pump's vacuum pumping speed cannot keep up with the speed of vacuum consumption by braking, the braking effect will deteriorate. However, according to existing standards and technologies, it is impossible to know the braking performance of the vacuum booster system of the vehicle during continuous braking. Summary of the invention

[0004] The main purpose of the present invention is to provide a vehicle braking performance evaluation method, device, equipment and readable storage medium, aiming to solve the technical problem that the braking performance of the vacuum booster system of the vehicle during continuous braking cannot be known according to existing standards and technologies.

[0005] In a first aspect, the present invention provides a vehicle braking performance evaluation method, the vehicle braking performance evaluation method comprising:

[0006] With the vehicle ignited and the vacuum pump at maximum vacuum, perform multiple braking tests on the vehicle;

[0007] Wherein, a braking test is to control the vehicle to perform a preset number of braking actions in a preset cycle, wherein the braking action is to apply a first preset percentage of the maximum pedal stroke to the brake pedal, and the length of the preset cycle of each braking test gradually increases;

[0008] Obtain the minimum vacuum and maximum pedal force for each brake test;

[0009] Based on the minimum vacuum, maximum pedal force and preset cycle of each braking test, the relationship curve between the preset cycle and the minimum vacuum, as well as the relationship curve between the preset cycle and the maximum pedal force are fitted to evaluate the vehicle braking performance.

[0010] Optionally, obtaining the minimum vacuum degree and maximum pedal force of each braking test includes:

[0011] Based on each braking test, the minimum vacuum degree and the maximum pedal force of each preset cycle are collected to obtain the minimum vacuum degree and the maximum pedal force of the preset number of times;

[0012] Selecting a preset number of minimum vacuum degrees and maximum pedal forces from the preset number of minimum vacuum degrees and maximum pedal forces, respectively, and taking an average value;

[0013] The average values ​​of the minimum vacuum degree and the maximum pedal force obtained are taken as the minimum vacuum degree and the maximum pedal force for each braking test.

[0014] Optionally, after the step of evaluating the vehicle braking performance, the following steps may be performed:

[0015] When the vehicle is turned off and the vacuum pump is at maximum vacuum, continuously applying a first preset percentage of maximum pedal travel braking to the vehicle at a preset period until the vacuum of the vacuum pump is reduced to a second preset percentage of maximum vacuum;

[0016] Get the minimum vacuum and maximum pedal force for each preset cycle;

[0017] According to the minimum vacuum degree and the maximum pedal force of each preset cycle, a relationship curve between the minimum vacuum degree and the maximum pedal force is obtained by fitting;

[0018] Determine the minimum vacuum degree corresponding to the preset pedal force according to the relationship curve between the minimum vacuum degree and the maximum pedal force;

[0019] If the minimum vacuum degree of the first braking test is greater than or equal to the minimum vacuum degree corresponding to the preset pedal force, the vehicle braking performance is determined to be up to standard; otherwise, the vehicle braking performance is determined to be not up to standard.

[0020] Optionally, the multiple braking tests on the vehicle include:

[0021] Conduct multiple braking tests on multiple vehicles;

[0022] The method of fitting the relationship curve between the preset cycle and the minimum vacuum degree, and the relationship curve between the preset cycle and the maximum pedal force based on the minimum vacuum degree, the maximum pedal force and the preset cycle of each braking test for evaluating the braking performance of the vehicle includes:

[0023] Based on the minimum vacuum, maximum pedal force and preset cycle of each vehicle in each braking test, a relationship curve between the preset cycle and the minimum vacuum of each vehicle, as well as a relationship curve between the preset cycle and the maximum pedal force of each vehicle are fitted to evaluate the vehicle braking performance of each vehicle.

[0024] Optionally, the vehicle braking performance evaluation method further includes:

[0025] When the vehicle is turned off and the vacuum pump is at a third preset percentage of the maximum vacuum degree, applying maximum pedal stroke braking to the vehicle for a preset number of times in a preset cycle to obtain a final minimum vacuum degree of the vacuum pump;

[0026] If the final minimum vacuum degree of the vacuum pump is greater than or equal to the preset vacuum degree, the vehicle braking performance is determined to be up to standard; otherwise, the vehicle braking performance is determined to be not up to standard.

[0027] Optionally, the preset vacuum degree is determined according to a vehicle model, and the vehicle models include M-type passenger vehicles and N-type cargo vehicles.

[0028] In a second aspect, the present invention further provides a vehicle braking performance evaluation device, the vehicle braking performance evaluation device comprising:

[0029] A test module is used to perform multiple braking tests on the vehicle under the condition that the vehicle is ignited and the vacuum pump is at the maximum vacuum degree;

[0030] A setting module, wherein a braking test is to control the vehicle to perform a preset number of braking actions in a preset cycle, wherein the braking action is to apply a first preset percentage of a maximum pedal stroke to the brake pedal, and the length of the preset cycle of each braking test gradually increases;

[0031] An acquisition module is used to obtain the minimum vacuum degree and the maximum pedal force of each braking test;

[0032] The fitting module fits the relationship curve between the preset cycle and the minimum vacuum degree, and the relationship curve between the preset cycle and the maximum pedal force based on the minimum vacuum degree, the maximum pedal force and the preset cycle of each braking test, so as to evaluate the braking performance of the vehicle.

[0033] Optionally, the acquisition module is used to:

[0034] Based on each braking test, the minimum vacuum degree and the maximum pedal force of each preset cycle are collected to obtain the minimum vacuum degree and the maximum pedal force of the preset number of times;

[0035] Selecting a preset number of minimum vacuum degrees and maximum pedal forces from the preset number of minimum vacuum degrees and maximum pedal forces, respectively, and taking an average value;

[0036] The average values ​​of the minimum vacuum degree and the maximum pedal force obtained are taken as the minimum vacuum degree and the maximum pedal force for each braking test.

[0037] In a third aspect, the present invention also provides a vehicle braking performance evaluation device, comprising a processor, a memory, and a vehicle braking performance evaluation program stored in the memory and executable by the processor, wherein when the vehicle braking performance evaluation program is executed by the processor, the steps of the vehicle braking performance evaluation method as described above are implemented.

[0038] In a fourth aspect, the present invention further provides a readable storage medium, on which a vehicle braking performance evaluation program is stored, wherein when the vehicle braking performance evaluation program is executed by a processor, the steps of the vehicle braking performance evaluation method as described above are implemented.

[0039] In the present invention, when the vehicle is ignited and the vacuum pump is at the maximum vacuum degree, the vehicle is subjected to multiple braking tests; wherein, one braking test is to control the vehicle to perform a preset number of braking actions in a preset cycle, and the braking action is to apply a first preset percentage of the maximum pedal stroke to the brake pedal, and the length of the preset cycle of each braking test gradually increases; the minimum vacuum degree and the maximum pedal force of each braking test are obtained; based on the minimum vacuum degree, the maximum pedal force and the preset cycle of each braking test, the relationship curve between the preset cycle and the minimum vacuum degree, and the relationship curve between the preset cycle and the maximum pedal force are fitted to evaluate the braking performance of the vehicle. The present invention gradually increases the cycle of continuous braking in each braking test to obtain the pedal force of the vehicle at different vacuum degrees, and performs curve fitting, so as to intuitively evaluate the braking performance of the vacuum boost system of the vehicle under continuous braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of a process flow of an embodiment of a vehicle braking performance evaluation method of the present invention;

[0041] Figure 2 A schematic diagram of a brake pedal robot according to an embodiment of a vehicle braking performance evaluation method of the present invention;

[0042] Figure 3 A pulse cycle diagram of an embodiment of a vehicle braking performance evaluation method of the present invention;

[0043] Figure 4 Another pulse cycle schematic diagram of an embodiment of a vehicle braking performance evaluation method of the present invention;

[0044] Figure 5 A schematic diagram of a fitting curve of an embodiment of a vehicle braking performance evaluation method of the present invention;

[0045] Figure 6 A schematic diagram of a curve of vacuum degree and pedal force of an embodiment of a vehicle braking performance evaluation method of the present invention;

[0046] Figure 7 A schematic diagram of a multi-vehicle fitting curve of an embodiment of a vehicle braking performance evaluation method of the present invention;

[0047] Figure 8 A schematic diagram of functional modules of an embodiment of a vehicle braking performance evaluation device of the present invention;

[0048] Fig. 9 This is a schematic diagram of the hardware structure of an embodiment of a vehicle braking performance evaluation device of the present invention.

[0049] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0051] In a first aspect, an embodiment of the present invention provides a vehicle braking performance evaluation method.

[0052] In order to more clearly demonstrate the vehicle braking performance evaluation method provided in the embodiment of the present application, the application scenario of the vehicle braking performance evaluation method provided in the embodiment of the present application is first introduced.

[0053] The vehicle braking performance evaluation method provided in the embodiment of the present application is applied in situations where continuous braking of the vehicle often occurs during actual operation. When the vehicle is braking, the vacuum pump will consume vacuum while the vehicle is braking. If the vacuum pump's vacuum extraction speed cannot keep up with the speed at which the vacuum is consumed by braking, the braking effect will deteriorate. Therefore, it is very necessary to clearly understand and master the braking performance of the vehicle's vacuum assist system during continuous braking.

[0054] In one embodiment, referring to Figure 1 , Figure 1 FIG. 1 is a flow chart of an embodiment of a method for evaluating vehicle braking performance according to the present invention. Figure 1 As shown, the vehicle braking performance evaluation method includes:

[0055] Step S10, when the vehicle is ignited and the vacuum pump is at the maximum vacuum degree, a plurality of braking tests are performed on the vehicle.

[0056] In this embodiment, the maximum vacuum degree of the vacuum pump is the stable value obtained from the sensor when the vacuum pump reaches the maximum vacuum state, referring to Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a brake pedal robot according to an embodiment of a vehicle braking performance evaluation method of the present invention. Figure 2 As shown, a pedal robot can be used to complete the braking action of the vehicle's brake pedal. When the vehicle is ignited, that is, the working condition of the vehicle in driving is simulated, multiple braking tests are performed to explore the braking performance of the vehicle's vacuum booster system.

[0057] Step S20, wherein a braking test is to control the vehicle to perform a preset number of braking actions in a preset cycle, wherein the braking action is to apply a first preset percentage of the maximum pedal stroke to the brake pedal, and the length of the preset cycle of each braking test gradually increases.

[0058] In this embodiment, a specific braking test can be to control the vehicle to perform a preset number of braking actions for 8 times with a preset period of 2 seconds. The braking action is to apply a first preset percentage of 80% of the maximum pedal stroke to the brake pedal of the vehicle. Specifically, the pedal robot can be used to step on the brake pedal to 80% of the maximum pedal stroke within 2 seconds, and complete the complete release of the brake pedal stroke. This cycle is performed 8 times to complete a braking test. In the test, the brake pedal is only stepped on to 80% of the maximum pedal stroke because when the brake pedal is stepped on to 100% of the maximum pedal stroke, the pedal force will be affected by the mechanical structure such as the spring, which will cause the maximum pedal force to increase, causing the pedal force to deviate from the normal value, which is inconsistent with the actual pedal feeling. The length of the preset period of each braking test gradually increases. Specifically, 9 braking tests can be performed, and the preset period of each braking test can be 2 seconds, 2.5 seconds, 3 seconds, 3.5 seconds, 4 seconds, 4.5 seconds, 5 seconds, 5.5 seconds and 6 seconds respectively. The increase of the preset period can be achieved by setting the pulse width of the pulse input signal of the pedal robot to 2 seconds, 2.5 seconds, 3 seconds, 3.5 seconds, 4 seconds, 4.5 seconds, 5 seconds, 5.5 seconds and 6 seconds respectively. Figure 3 , Figure 3 FIG. 1 is a pulse cycle diagram of an embodiment of a method for evaluating vehicle braking performance according to the present invention. Figure 3 As shown, the first braking test is to perform 8 braking actions with a preset period of 2 seconds, referring to Figure 4 , Figure 4 FIG. 2 is another pulse cycle diagram of an embodiment of a vehicle braking performance evaluation method of the present invention. Figure 4As shown, the second braking test is to perform 8 braking actions with a preset period of 2.5 seconds, and the ninth braking test is to perform 8 braking actions with a preset period of 6 seconds. The length of the preset period of each braking test gradually increases, which actually means that the frequency of braking is gradually decreasing. Since the vacuum pump consumes vacuum when braking the vehicle while drawing vacuum, the higher the braking frequency, the faster the vacuum of the vacuum pump is consumed. Therefore, the vacuum degree of the first braking test is the smallest and the corresponding pedal force is the largest, and the vacuum degree of the ninth braking test is the largest and the corresponding pedal force is the smallest.

[0059] Step S30, obtaining the minimum vacuum degree and the maximum pedal force of each braking test.

[0060] In this embodiment, as the length of the preset cycle of each braking test increases, the preset cycle of each braking test corresponding to 9 braking tests increases from 2 seconds to 6 seconds, and the minimum vacuum degree and maximum pedal force of each braking test will change. The minimum vacuum degree and the maximum pedal force are the minimum value of the vacuum degree and the maximum value of the pedal force obtained from the sensor within each preset cycle. The minimum vacuum degree and the maximum pedal force of each braking test are obtained to analyze the pedal force of the vehicle under different vacuum degrees during continuous braking.

[0061] Step S40, based on the minimum vacuum degree, maximum pedal force and preset period of each braking test, fitting the relationship curve between the preset period and the minimum vacuum degree, and the relationship curve between the preset period and the maximum pedal force, for evaluating the vehicle braking performance.

[0062] In this embodiment, the preset cycles for performing 9 braking tests are 2 seconds, 2.5 seconds, 3 seconds, 3.5 seconds, 4 seconds, 4.5 seconds, 5 seconds, 5.5 seconds and 6 seconds respectively. A curve fitting is performed between 2 seconds, 2.5 seconds, 3 seconds, 3.5 seconds, 4 seconds, 4.5 seconds, 5 seconds, 5.5 seconds and 6 seconds and the corresponding minimum vacuum degree of each braking test. A curve fitting is performed between 2 seconds, 2.5 seconds, 3 seconds, 3.5 seconds, 4 seconds, 4.5 seconds, 5 seconds, 5.5 seconds and 6 seconds and the corresponding maximum pedal force of each braking test. Figure 5 , Figure 5 FIG. 1 is a schematic diagram of a fitting curve of an embodiment of a vehicle braking performance evaluation method of the present invention. Figure 5 As shown, one can intuitively understand the pedal force conditions under different vacuum degrees during continuous braking of the vehicle, thereby clearly understanding the braking performance of the vacuum assist system during continuous braking of the vehicle.

[0063] In this embodiment, a pedal robot is used to simulate the working condition of the vehicle in driving state, and multiple braking tests are performed on the vehicle. The pedal force of the vehicle under different vacuum degrees is obtained by gradually increasing the continuous braking cycle of each braking test, and curve fitting is performed. In this way, the pedal force of the vehicle under different vacuum degrees during continuous braking can be intuitively understood, thereby clearly understanding the braking performance of the vacuum power-assisting system of the vehicle during continuous braking.

[0064] Furthermore, in one embodiment, step S30 includes:

[0065] Based on each braking test, the minimum vacuum degree and the maximum pedal force of each preset cycle are collected to obtain the minimum vacuum degree and the maximum pedal force of the preset number of times;

[0066] Selecting a preset number of minimum vacuum degrees and maximum pedal forces from the preset number of minimum vacuum degrees and maximum pedal forces, respectively, and taking an average value;

[0067] The average values ​​of the minimum vacuum degree and the maximum pedal force obtained are taken as the minimum vacuum degree and the maximum pedal force for each braking test.

[0068] In the present embodiment, specifically in each braking test, the number of brakings is 8 times. In the process of continuous braking, since the vacuum pump consumes vacuum while the vehicle is braking, the average value of the relatively stable minimum vacuum and maximum pedal force from the 5th to the 8th time can be taken as the minimum vacuum and maximum pedal force for each braking test.

[0069] Furthermore, in one embodiment, after step S40, the following steps are included:

[0070] When the vehicle is turned off and the vacuum pump is at maximum vacuum, continuously applying a first preset percentage of maximum pedal travel braking to the vehicle at a preset period until the vacuum of the vacuum pump is reduced to a second preset percentage of maximum vacuum;

[0071] Get the minimum vacuum and maximum pedal force for each preset cycle;

[0072] According to the minimum vacuum degree and the maximum pedal force of each preset cycle, a relationship curve between the minimum vacuum degree and the maximum pedal force is obtained by fitting;

[0073] Determine the minimum vacuum degree corresponding to the preset pedal force according to the relationship curve between the minimum vacuum degree and the maximum pedal force;

[0074] If the minimum vacuum degree of the first braking test is greater than or equal to the minimum vacuum degree corresponding to the preset pedal force, the vehicle braking performance is determined to be up to standard; otherwise, the vehicle braking performance is determined to be not up to standard.

[0075] In this embodiment, when the vehicle is turned off and the vacuum pump is at the maximum vacuum degree, 80% of the maximum pedal travel brake is continuously applied to the vehicle with a preset period of 2 seconds until the vacuum degree of the vacuum pump is reduced to 10% of the maximum vacuum degree. The minimum vacuum degree and the maximum pedal force in each preset period of 2 seconds are obtained, and then the relationship curve between the minimum vacuum degree and the maximum pedal force is obtained by fitting. Figure 6 , Figure 6 The figure is a curve diagram of the vacuum degree and the pedal force of an embodiment of the vehicle braking performance evaluation method of the present invention. The preset pedal force can be set to 500 N. 500 N is the size of the pedal force that the human body feels more comfortable when stepping on the brake pedal. When the pedal force is greater than 500 N, it is easy to cause a poor pedal feel. The vacuum degree corresponding to the pedal force of 500 N is used as a comparison standard. The minimum vacuum degree of the first braking test is the minimum vacuum degree when the preset period is 2 seconds. Braking with 2 seconds as the preset period is a very fast braking frequency, corresponding to a very small vacuum degree. Therefore, if the minimum vacuum degree when the preset period is 2 seconds is greater than or equal to the vacuum degree corresponding to the pedal force of 500 N, it can be explained that the braking performance of the vehicle is good. Otherwise, it can be explained that the braking performance of the vehicle is difficult to meet the standard.

[0076] Furthermore, in one embodiment, step S10 includes:

[0077] Conduct multiple braking tests on multiple vehicles;

[0078] Step S40 includes:

[0079] Based on the minimum vacuum, maximum pedal force and preset cycle of each vehicle in each braking test, a relationship curve between the preset cycle and the minimum vacuum of each vehicle, as well as a relationship curve between the preset cycle and the maximum pedal force of each vehicle are fitted to evaluate the vehicle braking performance of each vehicle.

[0080] In this embodiment, multiple braking tests can be performed on multiple vehicles respectively, so that the braking performance of each vehicle can be evaluated, and the braking performance of multiple vehicles can be compared. Figure 7 , Figure 7 FIG. 1 is a schematic diagram of a multi-vehicle fitting curve according to an embodiment of a vehicle braking performance evaluation method of the present invention. Figure 7 As shown, when the preset cycle is the same, the vacuum degree of vehicle 1 is smaller and the pedal force is larger than that of vehicle 2, which can indicate that the vacuum extraction capability of vehicle 2, that is, the braking performance of the vacuum boosting system is better than that of vehicle 1.

[0081] Furthermore, in one embodiment, the vehicle braking performance evaluation method further includes:

[0082] When the vehicle is turned off and the vacuum pump is at a third preset percentage of the maximum vacuum degree, applying maximum pedal stroke braking to the vehicle for a preset number of times in a preset cycle to obtain a final minimum vacuum degree of the vacuum pump;

[0083] If the final minimum vacuum degree of the vacuum pump is greater than or equal to the preset vacuum degree, the vehicle braking performance is determined to be up to standard; otherwise, the vehicle braking performance is determined to be not up to standard.

[0084] In this embodiment, the national standard GB12676 stipulates that the energy storage device of the motor vehicle should ensure that the specified emergency braking performance is achieved. When the vacuum pump is used as the energy source, the service brake device is actuated for 8 full strokes, and the energy storage device should not exceed 90% of the maximum vacuum degree provided by the energy source. The present invention uses vacuum degree as an evaluation index of vacuum braking performance. As a supplement to the national standard GB12676, the third preset percentage can be set to 90%, the preset number of times can be set to 8 times, and then the final minimum vacuum degree of the vacuum pump is compared with the preset vacuum degree to evaluate whether the vehicle braking performance meets the standard. The final minimum vacuum degree of the vacuum pump reflects the vacuum pumping capacity of the vacuum pump, that is, It reflects the braking performance of the vehicle. The braking performance of the corresponding vehicle should be able to meet the requirements of emergency braking performance. The preset vacuum degree is the minimum vacuum degree that can meet the requirements of emergency braking performance. In addition to being a corresponding supplement to the national standard GB12676, the advantage of the present invention is that the pedal robot can be used to test when the vehicle is turned off, which can make the test scenario more flexible, thereby being able to meet more types of test needs, and the vacuum degree indicator is used to evaluate whether the vehicle's braking performance meets the standard. It can be directly obtained through sensors, and it is more convenient to collect and obtain data, avoiding the use of braking deceleration indicators in the national standard, which requires testing of actual vehicles for easy collection and acquisition.

[0085] Furthermore, in one embodiment, the preset vacuum degree is determined according to a vehicle model, and the vehicle model includes an M-type passenger vehicle and an N-type cargo vehicle.

[0086] In this embodiment, the national standard GB12676 requires different emergency braking performance standards for M-type passenger vehicles and N-type cargo vehicles. For M-type vehicles, the average braking deceleration d≥2.5m / s 2 For N-type vehicles, the average braking deceleration d ≥ 2.2m / s 2 Correspondingly, different vacuum standards can be set according to M-type passenger vehicles and N-type truck vehicles to meet the needs of testing the vacuum braking performance of different models.

[0087] In a second aspect, an embodiment of the present invention further provides a vehicle braking performance evaluation device.

[0088] Reference Figure 8 , Figure 8 It is a schematic diagram of the functional modules of an embodiment of a vehicle braking performance evaluation device of the present invention.

[0089] In this embodiment, the vehicle braking performance evaluation device includes:

[0090] The test module 10 is used to perform multiple braking tests on the vehicle under the condition that the vehicle is ignited and the vacuum pump is at the maximum vacuum degree;

[0091] A setting module 20, for use in which a braking test is to control the vehicle to perform a preset number of braking actions in a preset cycle, wherein the braking action is to apply a first preset percentage of the maximum pedal stroke to the brake pedal, and the length of the preset cycle of each braking test gradually increases;

[0092] An acquisition module 30 is used to acquire the minimum vacuum degree and the maximum pedal force of each braking test;

[0093] The fitting module 40 fits the relationship curve between the preset cycle and the minimum vacuum degree, and the relationship curve between the preset cycle and the maximum pedal force based on the minimum vacuum degree, the maximum pedal force and the preset cycle of each braking test, so as to evaluate the braking performance of the vehicle.

[0094] Furthermore, in one embodiment, the acquisition module 30 is used to:

[0095] Based on each braking test, the minimum vacuum degree and the maximum pedal force of each preset cycle are collected to obtain the minimum vacuum degree and the maximum pedal force of the preset number of times;

[0096] Selecting a preset number of minimum vacuum degrees and maximum pedal forces from the preset number of minimum vacuum degrees and maximum pedal forces, respectively, and taking an average value;

[0097] The average values ​​of the minimum vacuum degree and the maximum pedal force obtained are taken as the minimum vacuum degree and the maximum pedal force for each braking test.

[0098] Furthermore, in one embodiment, the vehicle braking performance evaluation device further includes a first determination module, which is used to:

[0099] When the vehicle is turned off and the vacuum pump is at maximum vacuum, continuously applying a first preset percentage of maximum pedal travel braking to the vehicle at a preset period until the vacuum of the vacuum pump is reduced to a second preset percentage of maximum vacuum;

[0100] Get the minimum vacuum and maximum pedal force for each preset cycle;

[0101] According to the minimum vacuum degree and the maximum pedal force of each preset cycle, a relationship curve between the minimum vacuum degree and the maximum pedal force is obtained by fitting;

[0102] Determine the minimum vacuum degree corresponding to the preset pedal force according to the relationship curve between the minimum vacuum degree and the maximum pedal force;

[0103] If the minimum vacuum degree of the first braking test is greater than or equal to the minimum vacuum degree corresponding to the preset pedal force, the vehicle braking performance is determined to be up to standard; otherwise, the vehicle braking performance is determined to be not up to standard.

[0104] Furthermore, in one embodiment, the test module 10 is used to:

[0105] Conduct multiple braking tests on multiple vehicles;

[0106] The fitting module 40 is used for:

[0107] Based on the minimum vacuum, maximum pedal force and preset cycle of each vehicle in each braking test, a relationship curve between the preset cycle and the minimum vacuum of each vehicle, as well as a relationship curve between the preset cycle and the maximum pedal force of each vehicle are fitted to evaluate the vehicle braking performance of each vehicle.

[0108] Furthermore, the vehicle braking performance evaluation device in one embodiment further includes a second determination module, which is used to:

[0109] When the vehicle is turned off and the vacuum pump is at a third preset percentage of the maximum vacuum degree, applying maximum pedal stroke braking to the vehicle for a preset number of times in a preset cycle to obtain a final minimum vacuum degree of the vacuum pump;

[0110] If the final minimum vacuum degree of the vacuum pump is greater than or equal to the preset vacuum degree, the vehicle braking performance is determined to be up to standard; otherwise, the vehicle braking performance is determined to be not up to standard.

[0111] Furthermore, in one embodiment, the preset vacuum degree is determined according to a vehicle model, and the vehicle model includes an M-type passenger vehicle and an N-type cargo vehicle.

[0112] Among them, the functional implementation of each module in the above-mentioned vehicle braking performance evaluation device corresponds to the various steps in the above-mentioned vehicle braking performance evaluation method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0113] In a third aspect, an embodiment of the present invention provides a vehicle braking performance evaluation device, which may be a device having a data processing function, such as a personal computer (PC), a notebook computer, or a server.

[0114] Reference Fig. 9 , Fig. 9The hardware structure diagram of one embodiment of the vehicle braking performance evaluation device of the present invention. In the embodiment of the present invention, the vehicle braking performance evaluation device may include a processor 1001 (e.g., a central processing unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components; the user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a wireless interface (such as a wireless fidelity WIreless-FIdelity, WI-FI interface); the memory 1005 may be a high-speed random access memory (random access memory, RAM), or a stable memory (non-volatile memory), such as a disk storage, and the memory 1005 may optionally be a storage device independent of the aforementioned processor 1001. Those skilled in the art will understand that Fig. 9 The hardware structure shown in the figure does not constitute a limitation of the present invention, and may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0115] Continue to refer to Fig. 9 , Fig. 9 The memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a vehicle braking performance evaluation program. The processor 1001 may call the vehicle braking performance evaluation program stored in the memory 1005 and execute the vehicle braking performance evaluation method provided in the embodiment of the present invention.

[0116] In a fourth aspect, an embodiment of the present invention further provides a readable storage medium.

[0117] The vehicle braking performance evaluation program is stored on the readable storage medium of the present invention, wherein when the vehicle braking performance evaluation program is executed by the processor, the steps of the vehicle braking performance evaluation method as described above are implemented.

[0118] Among them, the method implemented when the vehicle braking performance evaluation program is executed can refer to the various embodiments of the vehicle braking performance evaluation method of the present invention, and will not be repeated here.

[0119] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0120] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0121] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present invention.

[0122] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vehicle braking performance evaluation method, characterized in that: The vehicle braking performance evaluation method comprises: With the vehicle ignited and the vacuum pump at maximum vacuum, perform multiple braking tests on the vehicle; Wherein, a braking test is to control the vehicle to perform a preset number of braking actions in a preset cycle, wherein the braking action is to apply a first preset percentage of the maximum pedal stroke to the brake pedal, and the length of the preset cycle of each braking test gradually increases; Obtain the minimum vacuum and maximum pedal force for each brake test; Based on the minimum vacuum degree, maximum pedal force and preset cycle of each braking test, a relationship curve between the preset cycle and the minimum vacuum degree, and a relationship curve between the preset cycle and the maximum pedal force are fitted to evaluate the vehicle braking performance; When the vehicle is turned off and the vacuum pump is at maximum vacuum, continuously applying a first preset percentage of maximum pedal travel braking to the vehicle at a preset period until the vacuum of the vacuum pump is reduced to a second preset percentage of maximum vacuum; Get the minimum vacuum and maximum pedal force for each preset cycle; According to the minimum vacuum degree and the maximum pedal force of each preset cycle, a relationship curve between the minimum vacuum degree and the maximum pedal force is obtained by fitting; According to the relationship curve between the minimum vacuum degree and the maximum pedal force, the minimum vacuum degree corresponding to the preset pedal force is determined; If the minimum vacuum degree of the first braking test is greater than or equal to the minimum vacuum degree corresponding to the preset pedal force, the vehicle braking performance is determined to be up to standard; otherwise, the vehicle braking performance is determined to be not up to standard.

2. The vehicle braking performance evaluation method according to claim 1, characterized in that: The method of obtaining the minimum vacuum degree and the maximum pedal force of each brake test includes: Based on each braking test, the minimum vacuum degree and the maximum pedal force of each preset cycle are collected to obtain the minimum vacuum degree and the maximum pedal force of the preset number of times; Selecting a preset number of minimum vacuum degrees and maximum pedal forces from the preset number of minimum vacuum degrees and maximum pedal forces, respectively, and taking an average value; The average values ​​of the minimum vacuum degree and the maximum pedal force obtained are taken as the minimum vacuum degree and the maximum pedal force for each braking test.

3. The vehicle braking performance evaluation method according to claim 1, characterized in that: The multiple braking tests on the vehicle include: Conduct multiple braking tests on multiple vehicles; The method of fitting the relationship curve between the preset cycle and the minimum vacuum degree, and the relationship curve between the preset cycle and the maximum pedal force based on the minimum vacuum degree, the maximum pedal force and the preset cycle of each braking test for evaluating the braking performance of the vehicle includes: Based on the minimum vacuum, maximum pedal force and preset cycle of each vehicle in each braking test, a relationship curve between the preset cycle and the minimum vacuum of each vehicle, as well as a relationship curve between the preset cycle and the maximum pedal force of each vehicle are fitted to evaluate the vehicle braking performance of each vehicle.

4. The vehicle braking performance evaluation method according to claim 1, characterized in that: The vehicle braking performance evaluation method further comprises: When the vehicle is turned off and the vacuum pump is at a third preset percentage of the maximum vacuum degree, applying maximum pedal stroke braking to the vehicle for a preset number of times in a preset cycle to obtain a final minimum vacuum degree of the vacuum pump; If the final minimum vacuum degree of the vacuum pump is greater than or equal to the preset vacuum degree, the vehicle braking performance is determined to be up to standard; otherwise, the vehicle braking performance is determined to be not up to standard.

5. The vehicle braking performance evaluation method according to claim 4, characterized in that: The preset vacuum degree is determined according to a vehicle model, and the vehicle models include an M-type passenger vehicle model and an N-type cargo vehicle model.

6. A vehicle braking performance evaluation device, characterized in that: The vehicle braking performance evaluation device comprises: A test module is used to perform multiple braking tests on the vehicle under the condition that the vehicle is ignited and the vacuum pump is at the maximum vacuum degree; A setting module, wherein a braking test is to control the vehicle to perform a preset number of braking actions in a preset cycle, wherein the braking action is to apply a first preset percentage of a maximum pedal stroke to the brake pedal, and the length of the preset cycle of each braking test gradually increases; An acquisition module is used to obtain the minimum vacuum degree and the maximum pedal force of each braking test; A fitting module, based on the minimum vacuum degree, the maximum pedal force and the preset cycle of each braking test, fits a relationship curve between the preset cycle and the minimum vacuum degree, and a relationship curve between the preset cycle and the maximum pedal force, so as to evaluate the braking performance of the vehicle; The vehicle braking performance evaluation device further includes a first determination module, which is used to: When the vehicle is turned off and the vacuum pump is at maximum vacuum, continuously applying a first preset percentage of maximum pedal travel braking to the vehicle at a preset period until the vacuum of the vacuum pump is reduced to a second preset percentage of maximum vacuum; Get the minimum vacuum and maximum pedal force for each preset cycle; According to the minimum vacuum degree and the maximum pedal force of each preset cycle, a relationship curve between the minimum vacuum degree and the maximum pedal force is obtained by fitting; According to the relationship curve between the minimum vacuum degree and the maximum pedal force, the minimum vacuum degree corresponding to the preset pedal force is determined; If the minimum vacuum degree of the first braking test is greater than or equal to the minimum vacuum degree corresponding to the preset pedal force, the vehicle braking performance is determined to be up to standard; otherwise, the vehicle braking performance is determined to be not up to standard.

7. The vehicle braking performance evaluation device according to claim 6, characterized in that: The acquisition module is used to: Based on each braking test, the minimum vacuum degree and the maximum pedal force of each preset cycle are collected to obtain the minimum vacuum degree and the maximum pedal force of the preset number of times; Selecting a preset number of minimum vacuum degrees and maximum pedal forces from the preset number of minimum vacuum degrees and maximum pedal forces, respectively, and taking an average value; The average values ​​of the minimum vacuum degree and the maximum pedal force obtained are taken as the minimum vacuum degree and the maximum pedal force for each braking test.

8. A vehicle braking performance evaluation device, characterized in that: The vehicle braking performance evaluation device includes a processor, a memory, and a vehicle braking performance evaluation program stored in the memory and executable by the processor, wherein when the vehicle braking performance evaluation program is executed by the processor, the steps of the vehicle braking performance evaluation method as described in any one of claims 1 to 5 are implemented.

9. A readable storage medium, characterized in that: The readable storage medium stores a vehicle braking performance evaluation program, wherein when the vehicle braking performance evaluation program is executed by a processor, the steps of the vehicle braking performance evaluation method as described in any one of claims 1 to 5 are implemented.

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