Vehicle Axle Testing Method, Device, Equipment and Storage Medium

Abstract

The present invention belongs to the field of automotive testing technology, and discloses a vehicle axle testing method, device, equipment and storage medium. In the present invention, the whole vehicle is parked on a roller bench, and the air pipe of the roller bench equipment is connected to the relay valve of the vehicle axle. When the vehicle wheels are located on the roller bench, the rollers of the roller bench are accelerated so that the rollers drive the wheels to accelerate. When the speed of the rollers reaches the target speed, the air pressure of the roller bench is adjusted so that the wheels decelerate under the action of the air pressure. When the deceleration of the wheels is stable, the braking torque value of the roller bench is obtained, a braking factor chart is drawn according to the braking torque value, and the braking factor value of the vehicle axle is determined according to the braking factor chart. Compared with the prior art, the present invention measures the braking effect of the wheels at different air pressure values, obtains the braking torque value of the roller bench, and fits a straight line according to the applied air pressure value and the corresponding braking torque value, thereby obtaining the braking factor value of the vehicle axle.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle testing, and particularly to a vehicle axle testing method, device, equipment and storage medium. Background Art

[0002] During the driving process of a vehicle, the braking effect directly affects the driving safety of the driver. With the continuous development of intelligent assisted driving systems, these intelligent assisted driving systems have high requirements for the braking accuracy of the chassis braking system. For commercial vehicles using air braking systems, in order to ensure that the braking system can accurately execute the deceleration requests of other systems, accurate braking factors of the brakes are required, that is, the braking torque generated by unit air pressure. When the braking factors are filled in inaccurately, it will cause the vehicle to fail to brake or brake roughly after the emergency braking assistance system is activated, affecting driving safety.

[0003] In order to test the axle braking factors, the current method is to drive the axle hub through a drum, accelerate the hub to different speeds respectively, and then provide a fixed air pressure by the brake chamber to test the braking torque in a stable state. This testing method will result in a single air pressure value being tested, making the accuracy of the test results low.

[0004] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide a vehicle axle testing method, device, equipment and storage medium, aiming to solve the technical problem of low accuracy of axle braking factors in the prior art.

[0006] To achieve the above purpose, the present invention provides a vehicle axle testing method. The vehicle is parked on a drum bench, and the air pipe of the drum bench equipment is connected to the relay valve of the vehicle axle. The method includes the following steps:

[0007] When the vehicle wheels are on the drum bench, accelerate the drums of the drum bench to drive the wheels to accelerate;

[0008] When the speed of the drums reaches the target speed, adjust the air pressure of the drum bench to decelerate the wheels under the action of the air pressure;

[0009] When the wheel deceleration is stable, obtain the braking torque value of the drum bench;

[0010] Draw a braking factor chart according to the braking torque value;

[0011] Determine the braking factor value of the vehicle axle according to the braking factor chart.

[0012] Optionally, when the speed of the drum reaches the target speed, adjusting the air pressure of the drum bench includes:

[0013] Reading a preset air pressure value set and selecting a target air pressure value from the preset air pressure value set;

[0014] Adjusting the air pressure of the drum bench according to the target air pressure value.

[0015] Optionally, after adjusting the air pressure of the drum bench according to the target air pressure value, it further includes:

[0016] Detecting the remaining preset air pressure values in the preset air pressure value set, and when there are unselected preset air pressure values in the preset air pressure value set, performing the steps of reading the preset air pressure value set and selecting a target air pressure value from the preset air pressure value set.

[0017] Optionally, after the speed of the drum reaches the target speed and the air pressure of the drum bench is adjusted to decelerate the wheel under the action of the air pressure, it includes:

[0018] Obtaining the first speed of the wheel;

[0019] After a preset interval time, obtaining the second speed of the wheel again, where the first speed is greater than the second speed;

[0020] Obtaining the deceleration according to the first speed, the second speed and the preset interval time.

[0021] Optionally, drawing a braking factor chart according to the braking torque value includes:

[0022] Recording the air pressure value and the braking torque value in a test dataset;

[0023] Drawing a braking factor chart by fitting the data in the test dataset.

[0024] Optionally, determining the braking factor value of the vehicle axle according to the braking factor chart includes:

[0025] Determining a braking factor curve according to the braking factor chart;

[0026] Obtaining the braking factor value according to the braking factor curve.

[0027] Optionally, before accelerating the drum bench to the target speed when the wheel of the vehicle is on the drum bench, it further includes:

[0028] Turning off the vehicle's parking brake;

[0029] Turning off the vehicle's electronic stability control system for the body.

[0030] In addition, to achieve the above object, the present invention further provides a vehicle axle testing device, and the vehicle axle testing device includes:

[0031] A bench control module, configured to accelerate the rollers of the roller bench to a target speed when the wheels of the vehicle are located on the roller bench, so that the rollers drive the wheels to accelerate;

[0032] An air pressure adjustment module, configured to adjust the air pressure of the roller bench when the speed of the rollers reaches the target speed, so that the wheels decelerate under the action of the air pressure;

[0033] A torque value acquisition module, configured to acquire the braking torque value of the roller bench when the deceleration of the wheels is stable;

[0034] A chart drawing module, configured to draw a braking factor chart according to the braking torque value;

[0035] A factor value determination module, configured to determine the braking factor value of the vehicle axle according to the braking factor chart.

[0036] In addition, to achieve the above object, the present invention further provides a vehicle axle testing equipment, and the vehicle axle testing equipment includes: a memory, a processor, and a vehicle axle testing program stored on the memory and executable on the processor, and the vehicle axle testing program is configured to implement the steps of the vehicle axle testing method as described above.

[0037] In addition, to achieve the above object, the present invention further provides a storage medium, and a vehicle axle testing program is stored on the storage medium, and when the vehicle axle testing program is executed by a processor, the steps of the vehicle axle testing method as described above are implemented.

[0038] In the present invention, the whole vehicle is parked on the roller bench, the air pipe of the roller bench equipment is connected to the relay valve of the vehicle axle. When the wheels of the vehicle are located on the roller bench, the rollers of the roller bench are accelerated so that the rollers drive the wheels to accelerate. When the speed of the rollers reaches the target speed, the air pressure of the roller bench is adjusted so that the wheels decelerate under the action of the air pressure. When the deceleration of the wheels is stable, the braking torque value of the roller bench is acquired, a braking factor chart is drawn according to the braking torque value, and the braking factor value of the vehicle axle is determined according to the braking factor chart. Compared with the prior art, by measuring the braking effect of the wheels at different air pressure values, the braking torque value of the roller bench is obtained, and a straight line is fitted according to the applied air pressure value and the corresponding braking torque value, and then the braking factor value of the vehicle axle is obtained. Description of the Drawings

[0039] Figure 1 It is a schematic structural diagram of a vehicle axle test device for the hardware operating environment involved in the embodiment solution of the present invention;

[0040] Figure 2 It is a schematic flowchart of the first embodiment of the vehicle axle test method of the present invention;

[0041] Figure 3 It is a schematic diagram of a test bench for an embodiment of the vehicle axle test method of the present invention;

[0042] Figure 4 It is a schematic flowchart of the second embodiment of the vehicle axle test method of the present invention;

[0043] Figure 5 It is a front axle side view of an embodiment of the vehicle axle test method of the present invention;

[0044] Figure 6 It is a side view of the rear axle of an embodiment of the vehicle axle test method of the present invention;

[0045] Figure 7 It is a braking factor chart of an embodiment of the vehicle axle test method of the present invention;

[0046] Figure 8 It is a structural block diagram of the first embodiment of the vehicle axle test device of the present invention.

[0047] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiments

[0048] 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.

[0049] Refer to Figure 1 , Figure 1 It is a schematic structural diagram of a vehicle axle test device for the hardware operating environment involved in the embodiment solution of the present invention.

[0050] Such as Figure 1As shown in the figure, the vehicle axle testing device may include: a processor 1001, such as 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 and an input unit such as a keyboard. Optionally, the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wireless-Fidelity (WI-FI) interface). The memory 1005 may be a high-speed Random Access Memory (RAM) or a stable Non-Volatile Memory (NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0051] Those skilled in the art can understand that Figure 1 the structure shown in the figure does not constitute a limitation on the vehicle axle testing device, and it may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0052] As Figure 1 shown, the memory 1005, as a storage medium, may include an operating system, a network communication module, a user interface module, and a vehicle axle testing program.

[0053] In Figure 1 the vehicle axle testing device shown in the figure, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the vehicle axle testing device of the present invention may be arranged in the vehicle axle testing device. The vehicle axle testing device calls the vehicle axle testing program stored in the memory 1005 through the processor 1001 and executes the vehicle axle testing method provided by the embodiments of the present invention.

[0054] The embodiments of the present invention provide a vehicle axle testing method. Referring to Figure 2 , Figure 2 it is a schematic flowchart of the first embodiment of a vehicle axle testing method of the present invention.

[0055] In this embodiment, the vehicle axle testing method includes the following steps:

[0056] Step S10: When the wheels of the vehicle are on the roller bench, accelerate the rollers of the roller bench so that the rollers drive the wheels to accelerate;

[0057] It should be noted that the execution subject of this embodiment is a vehicle axle test equipment. Among them, the vehicle axle test equipment has functions such as data processing, data communication, and program operation. The vehicle axle test equipment can be an integrated controller, a control computer, etc. Of course, it can also be other equipment with similar functions. This embodiment does not limit this.

[0058] It can be understood that the roller bench is a device for vehicle axle testing, which can place the front or rear wheels of the vehicle on the rollers of the roller bench. When the rollers on the roller bench start to rotate, the wheels of the vehicle parked on the roller bench will rotate together under the drive of the rollers.

[0059] In a specific implementation, when the vehicle travels to the roller bench, the parking position of the vehicle will be detected to check whether the front or rear wheels of the vehicle are in the test position of the bench. Assume that the current test is the front axle braking of the whole vehicle. Then, at this time, the front wheels of the whole vehicle are parked on the roller bench, and the rear wheels are parked on the ground. Only when it is detected that the wheels are in the detection position will the rollers of the roller bench start to accelerate and drive the front wheels of the whole vehicle to start accelerating and rotating.

[0060] Step S20: When the speed of the rollers reaches the target speed, adjust the air pressure of the roller bench so that the wheels decelerate under the action of the air pressure;

[0061] It should be noted that the target speed refers to the target rotational speed of the rollers of the roller bench, so that the wheels of the vehicle rotate at this speed. The target speed is flexibly adjusted according to actual test requirements, preferably 60 Km / h. This embodiment does not specifically limit the speed to which the rollers of the roller bench need to be accelerated.

[0062] It can be understood that on the roller bench, there is also a bench air pressure device connected. Refer to Figure 3 , which together form a vehicle axle test bench. The air pressure device includes an air compressor A, an air dryer B, an air storage tank C, a pressure regulating valve D, and a pressure gauge E. The bench part also includes rollers F, a data processor G, and a data display H. Among them, during the test, the air pipe of the air pressure device is connected to the service relay valve of the front axle or rear axle of the vehicle, so that the air pressure device can provide additional air pressure for the air brake.

[0063] In a specific implementation, the drum bench can detect the real-time rolling speed of the drum. When the rolling speed of the drum reaches the target speed, for example, 60 Km / h, the pneumatic device opens the air brake circuit through the service relay valve of the front axle or rear axle of the whole vehicle, and the speed of the wheel starts to decelerate under the action of air pressure. When the pneumatic device compresses gas, it compresses the air in the atmospheric environment through an air compressor. Under the action of an air dryer, the water vapor in the high-pressure gas is removed, and the dried high-pressure gas is stored in the air outlet cylinder, and the high-pressure gas can be discharged when needed.

[0064] Step S30: When the deceleration of the wheel is stable, obtain the braking torque value of the drum bench.

[0065] It should be noted that the wheel deceleration refers to the change in the reduction of the wheel speed. The deceleration reflects the trend of the wheel speed decreasing. The braking torque value refers to the braking torque value generated by the bench drum of the drum bench during the braking process of the wheel.

[0066] In a specific implementation, the vehicle axle test device of the whole vehicle will monitor the speed of the wheel in real time and calculate the deceleration of the wheel. Since during the braking process of the wheel, when a factor affecting its rotation is suddenly applied without interference factors, the speed of the wheel will change. During the process of speed change, the trend of speed reduction is different. When the interference factor applied from the outside remains unchanged, the trend of the wheel speed decreasing will also become stable accordingly. When the trend of the wheel speed decreasing is stable, that is, when the wheel deceleration is stable, the braking torque value of the current bench is obtained through the data processor and the data display.

[0067] Step S40: Draw a braking factor chart according to the braking torque value.

[0068] It should be noted that the braking factor chart refers to a set of data used to record the air pressure value applied by the pneumatic device and the corresponding braking torque value under the action of the air pressure value.

[0069] Step S50: Determine the braking factor value of the vehicle axle according to the braking factor chart.

[0070] It should be noted that the braking factor value refers to the influence parameter of different air pressure values on the braking effect during the air braking process of the wheel, and this influence parameter belongs to a characteristic and will not change with the changes of the outside world. The braking factor chart is an original data set that only includes simple data correspondence relationships. The braking factor value can be obtained according to the correspondence relationships in the original data set.

[0071] In a specific implementation, since the data recorded in the braking factor chart is discrete rather than continuous, when determining the vehicle axle braking factor value based on the braking factor chart, it is first necessary to determine which part the current data belongs to, whether it belongs to the front axle or the rear axle of the vehicle. Since there are differences in the braking factors between the front axle and the rear axle, in order to ensure that the finally measured braking factor value is more accurate, the front axle and the rear axle of the vehicle are determined separately when determining the braking factor.

[0072] In this embodiment, the whole vehicle is parked on the roller bench, and the air pipe of the roller bench equipment is connected to the relay valve of the vehicle axle. When the wheels of the vehicle are on the roller bench, the rollers of the roller bench are accelerated so that the rollers drive the wheels to accelerate. When the speed of the rollers reaches the target speed, the air pressure of the roller bench is adjusted so that the wheels decelerate under the action of the air pressure. When the deceleration of the wheels is stable, the braking torque value of the roller bench is obtained, and a braking factor chart is drawn according to the braking torque value. According to the braking factor chart, the braking factor value of the vehicle axle is determined. Compared with the prior art, the present invention measures the braking effect of the wheels at different air pressure values, obtains the braking torque value of the roller bench, and fits a straight line according to the applied air pressure value and the corresponding braking torque value, thereby obtaining the braking factor value of the whole vehicle axle.

[0073] Reference Figure 4 , Figure 4 is a schematic flow chart of the second embodiment of a method for testing a whole vehicle axle according to the present invention.

[0074] Based on the above first embodiment, the method for testing a whole vehicle axle in this embodiment further includes in the step S20:

[0075] Step S201: Read the preset air pressure value set and select a target air pressure value from the preset air pressure value set;

[0076] Step S202: Adjust the air pressure of the roller bench according to the target air pressure value.

[0077] It should be noted that the preset air pressure value set is a set of several air pressure values to be tested set for braking factor testing, and the purpose is to make the number of test groups relatively large, so as to avoid accidental results.

[0078] In a specific implementation, with reference to Figure 5 Figure 6, in the front axle test, the air inlet 12 of the front axle of the brake foot valve is connected to the service relay valve and the pneumatic equipment, the front axle air outlet 22 of the brake foot valve is connected to the front axle chamber, and the air pressure is connected to the air inlet 1 of the ABS solenoid valve through the service relay valve. The air pressure is output from the air outlet 2 of the ABS solenoid valve to generate a braking effect. Similarly, in the rear axle test, the air inlet 11 of the rear axle of the brake foot valve is connected to the service relay valve and the pneumatic equipment, the rear axle air outlet 21 of the brake foot valve is connected to the rear axle chamber, and the air pressure is connected to the air inlet 1 of the ABS solenoid valve through the service relay valve. The air pressure is output from the air outlet 2 of the ABS solenoid valve to generate a braking effect. To ensure the rigor of the test, as many sets of tests as possible should be carried out during the test. For example, the preset air pressure value set can be set to 1 bar, 2 bar, 3 bar... 7 bar... Of course, it can also be set to 1 bar, 1.5 bar, 2 bar, 2.5 bar, 3 bar... 7 bar... The setting of the test air pressure value can be flexibly arranged according to the test cost and the actual test situation, and this embodiment does not limit this. At the start of the test, the vehicle axle test equipment of the whole vehicle will select an air pressure value from the air pressure value set as the output air pressure of the pneumatic equipment, preferably selected in ascending order. For example, the currently selected air pressure value is 1 bar. Control the pressure regulating valve of the pneumatic equipment to adjust the output air pressure to 1 bar, and apply the 1 bar air pressure to the air braking components of the axle, so that the wheels brake and decelerate under the action of 1 bar air pressure.

[0079] Further, to ensure a more accurate braking torque value and the number of test groups, the following steps are also included:

[0080] Detect the remaining preset air pressure values in the preset air pressure value set. When there are unselected preset air pressure values in the preset air pressure value set, execute the steps of reading the preset air pressure value set and selecting a target air pressure value from the preset air pressure value set.

[0081] In a specific implementation, after selecting an air pressure value from the preset air pressure value set, the selection can be recorded. For this, a to-be-selected list can be created for the preset air pressure value set. When selecting a record, remove it from the list. At the same time, when selecting a preset air pressure value each time, the remaining preset air pressure values in the set can be detected. When there are still untested preset air pressure values, one can be selected from the untested preset air pressure values as the output air pressure value of the pneumatic equipment in the new round of test until all the preset air pressure values have been tested, otherwise this operation will be repeated continuously, thereby ensuring the amount of test data and obtaining sufficient test data.

[0082] Further, to further realize the judgment of the wheel deceleration, the following steps are also included:

[0083] Obtain the first speed of the wheel;

[0084] After a preset interval time, obtain the second speed of the wheel again, where the first speed is greater than the second speed.

[0085] Obtain a deceleration based on the first speed, the second speed, and the preset interval time.

[0086] It should be noted that the first speed refers to, when calculating a deceleration, among the two speeds, the speed with an earlier acquisition time is called the first speed, and the speed with a later acquisition time is called the second speed. Since the speed of the wheel is continuously decreasing, the first speed is greater than the second speed.

[0087] It can be understood that the preset interval time refers to the time interval between two acquisitions of the wheel speed. The longer the time interval, the greater the speed difference between the two speeds. The preset interval time is set according to the actual test environment, and this embodiment does not limit it.

[0088] In a specific implementation, starting from applying an air pressure value to the wheel, obtain the speed of the wheel. At this time, the first speed is 60 Km / h. After a preset interval time, such as 0.5 s, obtain the vehicle speed of the wheel again as 51 Km / h, which is called the second speed. At this time, it can be calculated that the deceleration obtained for the first time is 5 m / s 2 , when calculating the first deceleration, call the second speed in the previous stage the first speed in this stage, and call the speed obtained after 0.5 s, that is, at the 1 s moment from the start of braking, the second speed. If the second speed at this time is 33 Km / h, then the second deceleration calculated is 10 m / s 2 , if the vehicle speed is obtained as 15 Km / h after another 0.5 s, then the third deceleration calculated is 10 m / s 2 .

[0089] Or when obtaining the vehicle road speed, since the preset interval time does not change during the test, then it is possible to judge the difference between two speed values within a fixed preset time interval. For example, if within the first 0.5 s time period, the first speed is 60 Km / h and the second speed is 55 Km / h, then the speed difference within the first time period is 5 Km / h. If within the second time interval, the first speed is 55 Km / h and the second speed is 47 Km / h, then the speed difference within the second time period is 7 Km / h. If within the third time interval, the first speed is 47 Km / h and the second speed is 40 Km / h, then the speed difference within the third time period is 7 Km / h. According to the same operation process, if the speed differences are consistently the same continuously, it can also be considered that the deceleration is stable.

[0090] Further, in order to draw a braking factor chart based on the braking torque value, the following steps are also included:

[0091] Record the air pressure value and the braking torque value in the test dataset;

[0092] Fit and draw a braking factor chart according to the data in the test dataset.

[0093] It should be noted that the test dataset is a data set used to collect and record the obtained braking torque values, and the braking factor chart is a discrete chart drawn based on the braking torque values recorded in the test dataset.

[0094] In a specific implementation, referring to Figure 7 , when testing the front axle or rear axle of the whole vehicle, each time a test is performed, the currently tested axle, test air pressure, and braking torque value are combined into a set of data and recorded in the test dataset. After all test combinations are completed, a two-dimensional plane rectangular coordinate system regarding the air pressure value and the braking torque can be established according to the data recorded in the test dataset. For example, the horizontal axis can be set as the air pressure value, and the vertical axis can be set as the braking torque value. The recorded data is used to generate a discrete chart regarding the air pressure value and the braking torque according to the corresponding positions of the points on the plane rectangular coordinate system.

[0095] Further, in order to accurately obtain the braking factor value, the method further includes:

[0096] Determine a braking factor curve according to the braking factor chart;

[0097] Obtain the braking factor value according to the braking factor curve.

[0098] It should be noted that the braking factor curve is obtained by fitting the discrete points on the braking factor chart. The braking factor value refers to the factor value of the braking torque that can be generated by the vehicle axle of the whole vehicle under the action of air pressure, and can be understood as one of the inherent properties of the vehicle axle of the whole vehicle.

[0099] In a specific implementation, referring to Figure 7, the discrete points marked in the braking factor chart for the data in the test dataset are fitted into a curve in the form of the graph of a linear function. Since the data may shift during the test, which may cause a small deviation between the data measured at a certain air pressure value and the true data, when performing curve fitting, methods such as the least squares method or the gradient descent method that can be used for fitting discrete points can be adopted. In actual application scenarios, the least squares method is preferably used. The discrete points are respectively fitted into two curves according to the difference between the front axle and the rear axle, namely the fitting curve of the front axle and the fitting curve of the rear axle. And the slopes of the curves corresponding to the front axle and the rear axle are calculated respectively, and the obtained slopes are the braking factor values.

[0100] Furthermore, in order to avoid other factors interfering with the measurement of the braking factor value during the experiment, the method further includes:

[0101] Turn off the vehicle's parking brake;

[0102] Turn off the vehicle's Electronic Stability Program (ESP).

[0103] It should be noted that the vehicle parking brake is a braking system used to control and prevent the vehicle from moving, which can complete vehicle braking without human participation. The Electronic Stability Program (ESP) is a general term for a system or program that can effectively prevent the vehicle from losing control when it reaches its dynamic limit while improving the vehicle's handling performance. The Electronic Stability Program can enhance the safety and handling performance of the vehicle.

[0104] In specific implementation, when the front wheels or rear wheels of the whole vehicle are placed on the roller bench and all test preparations are completed, in order to avoid the influence of other functions or interference factors that affect the vehicle braking effect, it is necessary to turn off the vehicle's parking system and the Electronic Stability Program (ESP), so that the vehicle completes braking only under the action of air braking, ensuring that the final measured braking factor is more accurate.

[0105] In this embodiment, by turning off the vehicle's parking system and the Electronic Stability Program (ESP) that can interfere with the measurement of the braking factor, accelerating the rollers of the roller bench to a preset speed, measuring the corresponding braking torque values of the front axle and the rear axle of the whole vehicle on the bench at different air pressure values respectively, drawing the corresponding braking factor chart according to the air pressure values and braking torques of the front axle and the rear axle, and obtaining the slope of the curve according to the curves of the front axle and the rear axle in the chart, the corresponding slope is the braking factor value of the front axle or the rear axle. This can enable the front axle or the rear axle to complete tests at different air pressure values, obtain the braking torques at different air pressure values, ensure the data volume, reduce accidental errors, and make the measured data more accurate.

[0106] In addition, an embodiment of the present invention further provides a storage medium, on which a vehicle axle test program is stored. When the vehicle axle test program is executed by a processor, the steps of the vehicle axle test method described above are implemented.

[0107] Referring to Figure 4 , Figure 4 is a structural block diagram of the first embodiment of the vehicle axle test device of the present invention.

[0108] As Figure 4 shown, the vehicle axle test device proposed by the embodiment of the present invention includes:

[0109] A bench control module 10, configured to accelerate the rollers of the roller bench to a target speed when the wheels of the vehicle are on the roller bench, so that the rollers drive the wheels to accelerate;

[0110] An air pressure adjustment module 20, configured to adjust the air pressure of the roller bench when the speed of the rollers reaches the target speed, so that the wheels decelerate under the action of the air pressure;

[0111] A torque value acquisition module 30, configured to acquire the braking torque value of the roller bench when the wheel deceleration is stable;

[0112] A chart drawing module 40, configured to draw a braking factor chart according to the braking torque value;

[0113] A factor value determination module 50, configured to determine the braking factor value of the vehicle axle according to the braking factor chart.

[0114] In this embodiment, by parking the whole vehicle on the roller bench, connecting the air pipe of the roller bench equipment to the relay valve of the vehicle axle, when the wheels of the vehicle are on the roller bench, accelerating the rollers of the roller bench to drive the wheels to accelerate, when the speed of the rollers reaches the target speed, adjusting the air pressure of the roller bench to make the wheels decelerate under the action of the air pressure, when the wheel deceleration is stable, acquiring the braking torque value of the roller bench, drawing a braking factor chart according to the braking torque value, and determining the braking factor value of the vehicle axle according to the braking factor chart. Compared with the prior art, the present invention measures the braking effect of the wheels at different air pressure values, obtains the braking torque value of the roller bench, and fits a straight line according to the applied air pressure value and the corresponding braking torque value, so as to obtain the braking factor value of the vehicle axle.

[0115] In one embodiment, the air pressure adjustment module 20 is further configured to read a preset air pressure value set, select a target air pressure value from the preset air pressure value set; and adjust the air pressure of the roller bench according to the target air pressure value.

[0116] In one embodiment, the air pressure adjustment module 20 is further configured to detect the remaining preset air pressure values in the preset air pressure value set, and when there are unselected preset air pressure values in the preset air pressure value set, perform the steps of reading the preset air pressure value set and selecting a target air pressure value from the preset air pressure value set.

[0117] In one embodiment, the air pressure adjustment module 20 is further configured to obtain a first speed of the wheel; after a preset interval, obtain a second speed of the wheel again, where the first speed is greater than the second speed; and obtain a deceleration based on the first speed, the second speed, and the preset interval.

[0118] In one embodiment, the chart drawing module 40 is further configured to record the air pressure value and the braking torque value in a test dataset; and fit and draw a braking factor chart based on the data in the test dataset.

[0119] In one embodiment, the factor value determination module 50 is further configured to determine a braking factor curve based on the braking factor chart; and obtain a braking factor value based on the braking factor curve.

[0120] In one embodiment, the bench control module 10 is further configured to release the vehicle parking brake; and turn off the vehicle's electronic stability control system.

[0121] It should be understood that the above is only an example for illustration and does not impose any limitation on the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0122] It should be noted that the above-described work process is only illustrative and does not limit the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and there is no limitation here.

[0123] In addition, it should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or system including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the phrase "including one..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0124] 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.

[0125] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, magnetic disk, optical disc), and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0126] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A method for testing a vehicle axle, characterized in that, the whole vehicle is parked on a roller bench, and the air pipe of the roller bench equipment is connected to the relay valve of the vehicle axle. The method for testing the vehicle axle includes: When the wheels of the vehicle are on the roller bench, accelerate the rollers of the roller bench to drive the wheels to accelerate; When the speed of the rollers reaches the target speed, adjust the air pressure of the roller bench to decelerate the wheels under the action of the air pressure; When the deceleration of the wheels is stable, obtain the braking torque value of the roller bench; Record the air pressure value and the braking torque value in the test dataset; Fit and draw a braking factor chart based on the data in the test dataset; Determine the braking factor value of the vehicle axle according to the braking factor chart; Among them, when the speed of the rollers reaches the target speed, adjusting the air pressure of the roller bench includes: Read the preset air pressure value set, and select the target air pressure value from the preset air pressure value set; Adjust the air pressure of the roller bench according to the target air pressure value; Detect the remaining preset air pressure values in the preset air pressure value set. When there are unselected preset air pressure values in the preset air pressure value set, execute the steps of reading the preset air pressure value set and selecting the target air pressure value from the preset air pressure value set.

2. The method according to claim 1, characterized in that, after adjusting the air pressure of the roller bench when the speed of the rollers reaches the target speed to decelerate the wheels under the action of the air pressure, it includes: Obtain the first speed of the wheels; After a preset interval time, obtain the second speed of the wheels again, and the first speed is greater than the second speed; Obtain the deceleration according to the first speed, the second speed and the preset interval time.

3. The method according to claim 1, characterized in that, determining the braking factor value of the vehicle axle according to the braking factor chart includes: Determine the braking factor curve according to the braking factor chart; Obtain the braking factor value according to the braking factor curve.

4. The method according to any one of claims 1-3, characterized in that, before accelerating the roller bench to the target speed when the wheels of the vehicle are on the roller bench, it further includes: Turn off the vehicle's parking brake; Turn off the vehicle's electronic stability control system of the body.

5. A vehicle axle test device, characterized in that, the vehicle axle test device includes: A bench control module, used to accelerate the rollers of the roller bench to the target speed when the wheels of the vehicle are on the roller bench to drive the wheels to accelerate; An air pressure adjustment module, used to adjust the air pressure of the roller bench when the speed of the rollers reaches the target speed to decelerate the wheels under the action of the air pressure; A torque value acquisition module, used to obtain the braking torque value of the roller bench when the deceleration of the wheels is stable; A chart drawing module, used to record the air pressure value and the braking torque value in the test dataset; fit and draw a braking factor chart according to the data in the test dataset; A factor value determination module, configured to determine a braking factor value of the vehicle axle according to the braking factor chart; Wherein, when the speed of the drum reaches the target speed, adjusting the air pressure of the drum bench includes: Reading a preset air pressure value set, and selecting a target air pressure value from the preset air pressure value set; Adjusting the air pressure of the drum bench according to the target air pressure value; Detecting the remaining preset air pressure values in the preset air pressure value set, and when there are unselected preset air pressure values in the preset air pressure value set, performing the steps of reading the preset air pressure value set and selecting a target air pressure value from the preset air pressure value set.

6. A vehicle axle test device for a whole vehicle, Characterized in that The device includes: a memory, a processor, and a vehicle axle test program stored on the memory and executable on the processor, and the vehicle axle test program is configured to implement the steps of the vehicle axle test method according to any one of claims 1 to 4.

7. A storage medium, Characterized in that A vehicle axle test program is stored on the storage medium, and when the vehicle axle test program is executed by a processor, the steps of the vehicle axle test method according to any one of claims 1 to 4 are implemented.

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