Vehicle chassis performance test method, storage medium and electronic equipment

Abstract

The invention discloses a vehicle chassis performance test method, a storage medium and electronic equipment, and the method comprises the steps: receiving a trigger signal containing a test mode after a vehicle simulation model is imported, and the test mode comprises a real-time road condition input force mode, a dynamic output force mode and a static output force mode; obtaining a target output torque according to the test mode; acquiring the real-time output torque of the chassis of the to-be-tested vehicle after operation according to the vehicle simulation model; and generating a to-be-tested vehicle chassis performance test report according to the real-time output torque and the target output torque. According to the invention, overall analysis is carried out by taking the vehicle chassis as an input / output force system, loads are applied to the system, the input / output force environment of the vehicle chassis is simulated, the performance of the vehicle chassis is automatically tested on the platform, real vehicle testing is not needed, and the testing efficiency and precision are improved.

Description

Technical Field

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

[0002] With the development of the automotive industry, assisted driving has gradually become a standard feature in mid- to high-end vehicles. Currently, vehicle chassis performance is not subject to comprehensive pre-stage testing, and testing is primarily conducted on actual vehicles. This leads to issues such as late verification testing and difficulty in chassis tuning. Furthermore, when problems arise, the analysis and resolution cycle is highly risky, and the schedule is relatively tight, resulting in delays and inability to meet the demands of today's fast-paced development schedule. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiency of the prior art that the vehicle chassis performance can only be tested on a real vehicle and cannot be tested on a preliminary bench, and to provide a vehicle chassis performance testing method, storage medium and electronic equipment.

[0004] The technical solution of the present invention provides a vehicle chassis performance testing method, comprising:

[0005] After the vehicle simulation model is imported, a trigger signal including a test mode is received, wherein the test mode includes a real-time road condition input mode, a dynamic output mode, and a static output mode;

[0006] obtaining a target output torque according to the test mode;

[0007] Obtaining the real-time output torque of the chassis of the vehicle to be tested after running according to the vehicle simulation model;

[0008] A chassis performance test report of the vehicle to be tested is generated according to the real-time output torque and the target output torque.

[0009] In one of the optional technical solutions, obtaining the target output torque according to the test mode includes:

[0010] If the test mode is the real-time road condition input mode, obtaining a real vehicle road spectrum curve;

[0011] Acquire the actual vehicle output torque in the actual vehicle road spectrum curve according to a preset sampling frequency;

[0012] The actual vehicle output torque is set as the target output torque.

[0013] In one of the optional technical solutions, the actual vehicle road spectrum curve is obtained by the following method:

[0014] Obtain discrete road spectrum torque sampling points obtained from actual vehicle testing;

[0015] The discrete road spectrum torque sampling points are smoothed to obtain the actual vehicle road spectrum curve.

[0016] In one of the optional technical solutions, obtaining the target output torque according to the test mode includes:

[0017] If the test mode is the dynamic output mode, controlling the vehicle to be tested to run;

[0018] Acquiring dynamic test parameters and body state parameters of the vehicle to be tested when it is in a running state;

[0019] Calculating a dynamic output torque based on the dynamic test parameters and the vehicle model parameters;

[0020] The dynamic output torque is set as the target output torque.

[0021] In one optional technical solution, the dynamic test parameters include vehicle longitudinal speed, wind speed, and steering wheel angular velocity; the vehicle body state parameters include front wheel longitudinal force at the front tire contact center, rear wheel longitudinal force at the rear tire contact center, gravitational acceleration, ramp angle, vehicle mass, center of mass height, front axle distance from the front axle to the center of mass, rear axle distance from the rear axle to the center of mass, number of tires on the front and rear axles, air resistance coefficient, air density, frontal area, motor efficiency, electric cylinder output thrust, screw lead, and screw radius; and the dynamic output torque is calculated based on the dynamic test parameters and the vehicle model parameters, including:

[0022] Calculating the traction force on the vehicle to be tested based on the front wheel longitudinal force, the rear wheel longitudinal force and the number of tires on the front and rear axles;

[0023] Calculating the air resistance of the vehicle to be tested according to the air resistance coefficient, the air density, the frontal area, the longitudinal speed of the vehicle, and the wind speed;

[0024] Calculating the longitudinal force of the vehicle to be tested in the longitudinal direction according to the traction, the air resistance, the vehicle mass, the acceleration of gravity, and the ramp angle;

[0025] Calculate the front wheel normal force at the center of contact of the front tire and the rear wheel normal force at the center of contact of the rear tire of the vehicle to be tested according to the air resistance, the center of mass height, the vehicle mass, the ramp angle, the front axle distance, the rear axle distance, and the longitudinal force;

[0026] Calculating the steering resistance of the vehicle to be tested according to a preset test coefficient and the steering wheel angular velocity;

[0027] Calculating the front wheel friction coefficient and the rear wheel friction coefficient respectively according to the front wheel normal force, the rear wheel normal force and the electric cylinder output thrust;

[0028] Calculating the front wheel real-time output torque and the rear wheel real-time output torque respectively according to the front wheel friction coefficient, the rear wheel friction coefficient, the electric cylinder output thrust, the screw lead, the screw radius and the motor efficiency;

[0029] The front wheel real-time output torque and the rear wheel real-time output torque are set as the dynamic output torque.

[0030] In one of the optional technical solutions,

[0031] The method of calculating the front wheel real-time output torque and the rear wheel real-time output torque respectively according to the front wheel friction coefficient, the rear wheel friction coefficient, the electric cylinder output thrust, the screw lead, the screw radius and the motor efficiency includes:

[0032] The front wheel real-time output torque and the rear wheel real-time output torque are calculated using the following formulas:

[0033]

[0034] Among them, T f is the real-time output torque of the front wheel, T r is the real-time output torque of the rear wheel, F is the steering resistance, ζ f is the front wheel friction coefficient, ζ r is the rear wheel friction coefficient, R is the screw radius, L is the screw lead, N is the motor efficiency, P and k are the preset test coefficients, V p is the steering wheel angular velocity.

[0035] In one of the optional technical solutions, obtaining the target output torque according to the test mode includes:

[0036] If the test mode is the static output mode, controlling the vehicle to be tested to run according to at least one input steering wheel angle;

[0037] Obtaining a static input force curve of the vehicle to be tested when the vehicle is in the state of steering wheel angle operation;

[0038] Obtaining a static output torque according to the static input force curve;

[0039] The static output torque is set as the target output torque.

[0040] In one of the optional technical solutions, the step of generating a chassis performance test report of the vehicle to be tested based on the real-time output torque and the target output torque further includes:

[0041] If the real-time output torque is different from the target output torque, calculating a deviation between the real-time output torque and the target output torque;

[0042] The PID algorithm is used to take the deviation value as an input value to adjust the real-time output torque.

[0043] The technical solution of the present invention also provides a computer-readable storage medium, which stores computer instructions. When a computer executes the computer instructions, it is used to execute all steps of the vehicle chassis performance testing method as described above.

[0044] The technical solution of the present invention further provides an electronic device, comprising:

[0045] at least one processor; and,

[0046] a memory communicatively connected to the at least one processor; wherein,

[0047] The memory stores instructions that can be executed by the at least one processor. The instructions are executed by the at least one processor to enable the at least one processor to perform the vehicle chassis performance testing method as described above.

[0048] After adopting the above technical solution, it has the following beneficial effects: after the vehicle simulation model is imported, a trigger signal containing a test mode is received, and the test mode includes a real-time road input mode, a dynamic output mode and a static output mode. The target output torque is obtained according to the test mode, and the real-time output torque of the chassis of the vehicle to be tested after running according to the vehicle simulation model is obtained. A performance test report of the chassis of the vehicle to be tested is generated according to the real-time output torque and the target output torque, so that the vehicle chassis is used as the input and output force system for overall analysis, and a load is applied to the system to simulate the input and output force environment of the vehicle chassis, so as to realize the test of vehicle chassis performance on an automated platform without the need for actual vehicle testing, thereby improving test efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings:

[0050] Figure 1 A flowchart of a vehicle chassis performance testing method provided by one embodiment of the present invention;

[0051] Figure 2 A schematic structural diagram of a vehicle chassis performance testing system provided by one embodiment of the present invention;

[0052] Figure 3A flowchart of a vehicle chassis performance testing method provided by the best embodiment of the present invention;

[0053] Figure 4 A schematic diagram of the structure when the vehicle under test is simulated and run;

[0054] Figure 5 for Figure 3 Workflow diagram of the embedded system initialization method in;

[0055] Figure 6 A schematic diagram of the hardware structure of an electronic device for testing vehicle chassis performance provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0056] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0057] It is easy to understand that according to the technical solution of the present invention, a variety of structural modes and implementation modes can be replaced with each other by those skilled in the art without changing the essential spirit of the present invention. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the invention.

[0058] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to the structure shown in the drawings. They are relative concepts and may vary depending on the location and usage of the device. Therefore, these or other directional terms should not be interpreted as restrictive.

[0059] like Figure 1 As shown, an embodiment of the present invention provides a vehicle chassis performance testing method, comprising:

[0060] Step S101: After the vehicle simulation model is imported, a trigger signal including a test mode is received;

[0061] Step S102: obtaining a target output torque according to the test mode;

[0062] Step S103: obtaining the real-time output torque of the chassis of the vehicle to be tested after running according to the vehicle simulation model;

[0063] Step S104: generating a chassis performance test report of the vehicle to be tested according to the real-time output torque and the target output torque.

[0064] Specifically, when the vehicle chassis needs to be tested for performance, the following Figure 2The vehicle chassis performance test system shown includes a controller 10, a steering mechanism 20, and a servo mechanism 30. The servo mechanism 30 includes a servo motor and a servo cylinder. A torque sensor 40 is provided between the servo cylinder and the steering mechanism 20. The torque sensor 40 is used to detect the real-time output torque of the vehicle chassis under test. After the vehicle simulation model is imported into the system, the vehicle chassis under test operates according to the vehicle simulation model. The controller 10 executes step S101 to receive a trigger signal containing a test mode. The trigger signal can be generated according to the test mode selected by the user. The test modes include real-time road input mode, dynamic output mode, and static output mode.

[0065] Then, step S102 is executed to perform an automated test on the chassis of the vehicle to be tested according to the test mode to obtain a target output torque corresponding to the test mode. If the test mode is a real-time road input mode, the target output torque is the input data of the actual chassis under any road spectrum collected by the actual vehicle corresponding to the real-time road input mode. The actual chassis input data is imported into the controller, and the controller reproduces the output input according to the actual chassis input data; if the test mode is a dynamic output mode, the chassis output of the vehicle to be tested continuously changes according to the set dynamic input curve, the steering mechanism produces relative motion, and the target output torque is obtained according to the dynamic input curve; if the test mode is a static output mode, the chassis of the vehicle to be tested is input according to the fixed output mode, the steering mechanism remains relatively stationary, and the target output torque is obtained according to the set static input curve;

[0066] Then, step S103 is executed. After the vehicle to be tested runs according to the vehicle simulation model, the real-time output torque of the chassis of the vehicle to be tested is obtained through a torque sensor provided between the servo electric cylinder and the steering mechanism.

[0067] Finally, step S104 is executed to record the test data of the entire test process in real time and generate a test report on the chassis performance of the vehicle to be tested. In this way, the vehicle chassis is used as the input and output force system for overall analysis, and a load is applied to the system to simulate the input and output force environment of the vehicle chassis. The vehicle chassis performance can be tested on an automated platform without the need for actual vehicle testing, thereby improving test efficiency and accuracy.

[0068] The vehicle chassis performance testing method provided in this embodiment receives a trigger signal including a test mode after a vehicle simulation model is imported. The test mode includes a real-time road condition input mode, a dynamic output mode, and a static output mode. The target output torque is obtained according to the test mode, and the real-time output torque of the chassis of the vehicle to be tested after running according to the vehicle simulation model is obtained. A chassis performance test report of the vehicle to be tested is generated according to the real-time output torque and the target output torque. The vehicle chassis is used as the input and output force system for overall analysis, and a load is applied to the system to simulate the input and output force environment of the vehicle chassis, thereby realizing the testing of vehicle chassis performance on an automated platform without the need for actual vehicle testing, thereby improving test efficiency and accuracy.

[0069] like Figure 3 As shown, the best embodiment of the present invention provides a vehicle chassis performance testing method, comprising:

[0070] Step S301: Embedded system initialization;

[0071] Step S302: loading the vehicle simulation model;

[0072] Step S303: Determine whether the test mode is the real-time traffic input mode;

[0073] Step S304: obtaining a real vehicle road spectrum curve;

[0074] Step S305: obtaining the actual vehicle output torque in the actual vehicle road spectrum curve according to a preset sampling frequency;

[0075] Step S306: setting the actual vehicle output torque as the target output torque;

[0076] Step S307: determining whether the test mode is a dynamic output mode;

[0077] Step S308: Control the vehicle to be tested to run;

[0078] Step S309: obtaining dynamic test parameters and vehicle body state parameters when the vehicle to be tested is in a running state;

[0079] Step S310: Calculating the dynamic output torque based on the dynamic test parameters and the vehicle model parameters;

[0080] Step S311: setting the dynamic output torque as the target output torque;

[0081] Step S312: controlling the vehicle to be tested to run according to at least one input steering wheel angle;

[0082] Step S313: obtaining a static input force curve of the vehicle under test when the vehicle is in a steering wheel angle operation state;

[0083] Step S314: Obtaining a static output torque according to the static input force curve;

[0084] Step S315: setting the static output torque as the target output torque;

[0085] Step S316: determining whether the real-time output torque is the same as the target output torque;

[0086] Step S317: Calculate the deviation between the real-time output torque and the target output torque;

[0087] Step S318: Using the PID algorithm to take the deviation value as input value to adjust the real-time output torque;

[0088] Step S319: Generate a chassis performance test report for the vehicle to be tested.

[0089] Specifically, before performing a performance test on the vehicle chassis, the controller executes step S301 to initialize the embedded system; then executes steps S302-S303 to determine whether the test mode is a real-time road condition input mode, if so, executes steps S304-S306, otherwise executes step S307 to determine whether the test mode is a dynamic output mode, if so, executes steps S308-S311, otherwise executes steps S311-S315; then executes step S316 to determine whether the real-time output torque is the same as the target output torque, if not, executes steps S317-S319, otherwise executes step S319.

[0090] In step S304-step S306, the actual vehicle road spectrum curve is generated by the actual chassis input data under any road spectrum of the actual vehicle, and the actual chassis input data is imported into the controller. The controller reproduces the output input based on the actual chassis input data, and then uses a preset sampling frequency (such as every 5 seconds) to obtain the actual vehicle output torque in the actual vehicle road spectrum curve, and uses the actual vehicle output torque as the input of the chassis of the vehicle to be tested.

[0091] In steps S308-S311, the operation of the vehicle to be tested can be controlled by continuously inputting different steering angles to the steering wheel so that the steering wheel is constantly rotating (such as taking a serpentine route), and inputting input to the chassis of the vehicle to be tested according to the dynamic input curve so that the real-time output torque output by the chassis of the vehicle to be tested is constantly changing, thereby obtaining the real-time output torque of the chassis of the vehicle to be tested.

[0092] In steps S312-S315, the vehicle chassis under test can be tested at multiple fixed steering wheel angles. Specifically, the steering wheel is fixed at one angle, causing the vehicle to circle in place. At each fixed steering wheel angle, the corresponding input force is input according to the test requirements to obtain the real-time output torque of the vehicle chassis under test.

[0093] In steps S316 to S318, the deviation between the real-time output torque and the target output torque is calculated, and the real-time output torque is adjusted using a PID algorithm according to the deviation, thereby correcting the mechanical error and further improving the test accuracy.

[0094] The vehicle chassis performance testing method provided in this embodiment performs an overall analysis of the vehicle chassis as the input and output force system, applies a load to the system, simulates the input and output force environment to which the vehicle chassis is subjected, and implements vehicle chassis performance testing on an automated platform without the need for actual vehicle testing, thereby improving testing efficiency and accuracy.

[0095] In one embodiment, the actual vehicle road spectrum curve is obtained by the following method:

[0096] Obtain discrete road spectrum torque sampling points obtained from actual vehicle testing;

[0097] The discrete road spectrum torque sampling points are smoothed to obtain the actual vehicle road spectrum curve.

[0098] In one embodiment, the dynamic test parameters include vehicle longitudinal speed, wind speed, and steering wheel angular velocity; the vehicle body state parameters include front wheel longitudinal force at the front tire contact center, rear wheel longitudinal force at the rear tire contact center, gravitational acceleration, ramp angle, vehicle mass, center of mass height, front axle distance from the front axle to the center of mass, rear axle distance from the rear axle to the center of mass, number of tires on the front and rear axles, air resistance coefficient, air density, frontal area, motor efficiency, electric cylinder output thrust, screw lead, and screw radius. Step S310 includes:

[0099] Calculating the traction force on the vehicle to be tested based on the front wheel longitudinal force, the rear wheel longitudinal force and the number of tires on the front and rear axles;

[0100] Calculating the air resistance of the vehicle to be tested according to the air resistance coefficient, the air density, the frontal area, the longitudinal speed of the vehicle, and the wind speed;

[0101] Calculating the longitudinal force of the vehicle to be tested in the longitudinal direction according to the traction, the air resistance, the vehicle mass, the acceleration of gravity, and the ramp angle;

[0102] Calculate the front wheel normal force at the center of contact of the front tire and the rear wheel normal force at the center of contact of the rear tire of the vehicle to be tested according to the air resistance, the center of mass height, the vehicle mass, the ramp angle, the front axle distance, the rear axle distance, and the longitudinal force;

[0103] Calculating the steering resistance of the vehicle to be tested according to a preset test coefficient and the steering wheel angular velocity;

[0104] Calculating the front wheel friction coefficient and the rear wheel friction coefficient respectively according to the front wheel normal force, the rear wheel normal force and the electric cylinder output thrust;

[0105] Calculating the front wheel real-time output torque and the rear wheel real-time output torque respectively according to the front wheel friction coefficient, the rear wheel friction coefficient, the electric cylinder output thrust, the screw lead, the screw radius and the motor efficiency;

[0106] The front wheel real-time output torque and the rear wheel real-time output torque are set as the dynamic output torque.

[0107] Specifically, such as Figure 4 As shown in the figure, when the vehicle is running, the traction force it receives mainly comes from the horizontal force of the ground on the wheels. The traction force F x and the front wheel longitudinal force F xf , rear wheel longitudinal force F xr It is related to the number of tires on the front and rear axles n, that is, according to the front wheel longitudinal force F xf , rear wheel longitudinal force F xr Calculate the traction force F using the number of tires n on the front and rear axles x ;

[0108] When the vehicle to be tested is running, there is air resistance F d , air resistance F d and the vehicle longitudinal velocity V x , wind speed V w , the vehicle's frontal area A, air resistance coefficient C d It is related to the air density ρ factor, that is, according to the vehicle longitudinal speed V x , wind speed V w , frontal area A, air resistance coefficient C d Calculate the air resistance F using the air density ρ d ;

[0109] The horizontal traction F in the longitudinal direction of the vehicle under test is x , air resistance F d And the effect of slope resistance, which is the component of vehicle gravity along the slope direction, that is, according to the horizontal traction F x , air resistance F d , vehicle mass m, gravitational acceleration g and ramp angle β to calculate the longitudinal force

[0110] The normal support force on the vehicle to be tested mainly comes from the normal force of the ground on the wheels. The magnitude of the force on the front and rear axles is related to the horizontal distance from the front and rear axles to the center of mass, acceleration, slope angle, etc., that is, according to the air resistance F d, center of mass height h, vehicle mass m, ramp angle β, front axle distance a, rear axle distance b, calculate the front wheel normal force F respectively zf and the rear wheel normal force F zr ;

[0111] According to the preset test coefficients P and k, the steering wheel angular velocity V p Calculate the steering resistance F. The preset test coefficients P and k can be set according to the test conditions;

[0112] According to the front wheel normal force F zf , rear wheel normal force F zr and the electric cylinder output thrust F to calculate the front wheel friction coefficient ζ f and rear wheel friction coefficient ζ r ;

[0113] According to the front wheel friction coefficient ζ f , rear wheel friction coefficient ζ r , electric cylinder output thrust F, screw lead L, screw radius R and motor efficiency N are used to calculate the real-time output torque T of the front wheel. f and the rear wheel real-time output torque T r .

[0114] In one embodiment,

[0115] The method of calculating the front wheel real-time output torque and the rear wheel real-time output torque respectively according to the front wheel friction coefficient, the rear wheel friction coefficient, the electric cylinder output thrust, the screw lead, the screw radius and the motor efficiency includes:

[0116] The front wheel real-time output torque and the rear wheel real-time output torque are calculated using the following formulas:

[0117]

[0118] Among them, T f is the real-time output torque of the front wheel, T r is the real-time output torque of the rear wheel, F is the steering resistance, ζ f is the front wheel friction coefficient, ζ r is the rear wheel friction coefficient, R is the screw radius, L is the screw lead, N is the motor efficiency, P and k are the preset test coefficients, V p is the steering wheel angular velocity.

[0119] Among them, P and k can be set according to different test conditions (such as different test angular velocities, test vehicle speeds, etc.).

[0120] It should be noted that the above traction force F x , air resistance Fd , longitudinal force Front wheel normal force F zf and the rear wheel normal force F zr , front wheel real-time output torque T f and the rear wheel real-time output torque T r Other existing methods may also be used for calculation, and are not limited to this application.

[0121] like Figure 5 As shown, the embedded system initialization method provided by the present invention includes:

[0122] Step S501: Setting the crystal oscillator clock frequency division communication baud rate;

[0123] Step S502: Determine whether the self-test device is operating normally;

[0124] Step S503: The system fault light flashes, prompting you to check the device status as soon as possible;

[0125] Step S504: enabling and defining the required transmission port mode;

[0126] Step S505: Enable the torque sensor and servo motor output;

[0127] Step S506: Initializing the motor parameters to initial values;

[0128] Step S507: Determine whether the online status of the serial port screen is normal;

[0129] Step S508: If the screen fails, a red light will be displayed, prompting you to check the screen device;

[0130] Step S509: Display the current parameter status;

[0131] Step S510: Enter vehicle chassis test mode.

[0132] Specifically, in step S502, it is determined whether the self-test device is operating normally. If not, step S503 is executed. If yes, steps S504 to S507 are executed.

[0133] In step S507, it is determined whether the online status of the serial port screen is normal. If not, step S508 is executed. If yes, step S509-step S510 are executed.

[0134] In this embodiment, by initializing the embedded system, interference from other mechanical equipment during vehicle chassis performance testing is avoided, thereby further improving test efficiency and accuracy.

[0135] An embodiment of the present invention provides a computer-readable storage medium for storing computer instructions. When a computer executes the computer instructions, it is used to execute all steps of the vehicle chassis performance testing method in any of the above-mentioned method embodiments.

[0136] like Figure 6 As shown, a hardware structure diagram of an electronic device for vehicle chassis performance testing provided by one embodiment of the present invention includes:

[0137] at least one processor 601; and,

[0138] A memory 602 in communication with at least one processor 601; wherein,

[0139] The memory 602 stores instructions that can be executed by at least one processor 601. The instructions are executed by the at least one processor 601 so that the at least one processor 601 can execute the vehicle chassis performance testing method in any of the above-mentioned method embodiments.

[0140] Figure 6 A processor 601 is taken as an example.

[0141] The electronic device is preferably an Electronic Control Unit (ECU).

[0142] The electronic device may further include: an input device 603 and an output device 604 .

[0143] The processor 601, the memory 602, the input device 603 and the output device 604 may be connected via a bus or other means, with the bus connection being used as an example in the figure.

[0144] The memory 602 is a non-volatile computer-readable storage medium that can be used to obtain non-volatile software programs, non-volatile computer executable programs and modules, such as the program instructions / modules corresponding to the vehicle chassis performance test method in the embodiment of the present application, for example, Figure 1 、 Figure 3 and Figure 5 The processor 601 executes various functional applications and data processing by running the non-volatile software programs, instructions and modules acquired from the memory 602, that is, implementing the vehicle chassis performance test method in the above embodiment.

[0145] The memory 602 may include a program acquisition area and a data acquisition area, wherein the program acquisition area may acquire an operating system and applications required for at least one function; the data acquisition area may acquire data created according to the use of the vehicle chassis performance test method, etc. In addition, the memory 602 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 602 may optionally include a memory remotely located relative to the processor 601, and these remote memories may be connected to a device for executing the vehicle chassis performance test method via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0146] The input device 603 can receive user clicks and generate signal input related to user settings and function control of the vehicle chassis performance test method. The output device 604 can include a display device such as a display screen.

[0147] The one or more modules are acquired in the memory 602 and, when run by the one or more processors 601 , execute the vehicle chassis performance test method in any of the above method embodiments.

[0148] The above-mentioned product can execute the method provided in the embodiment of this application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the method provided in the embodiment of this application.

[0149] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, rather than to limit them. Although the embodiments of the present invention have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle chassis performance testing method, characterized in that: include: After the vehicle simulation model is imported, a trigger signal including a test mode is received, wherein the test mode includes a real-time road condition input mode, a dynamic output mode, and a static output mode; obtaining a target output torque according to the test mode; Obtaining the real-time output torque of the chassis of the vehicle to be tested after running according to the vehicle simulation model; A chassis performance test report of the vehicle to be tested is generated according to the real-time output torque and the target output torque.

2. The vehicle chassis performance testing method according to claim 1, wherein: Obtaining the target output torque according to the test mode includes: If the test mode is the real-time road condition input mode, obtaining a real vehicle road spectrum curve; Acquire the actual vehicle output torque in the actual vehicle road spectrum curve according to a preset sampling frequency; The actual vehicle output torque is set as the target output torque.

3. The vehicle chassis performance testing method according to claim 2, wherein: The actual vehicle road spectrum curve is obtained by the following method: Obtain discrete road spectrum torque sampling points obtained from actual vehicle testing; The discrete road spectrum torque sampling points are smoothed to obtain the actual vehicle road spectrum curve.

4. The vehicle chassis performance testing method according to claim 1, wherein: Obtaining the target output torque according to the test mode includes: If the test mode is the dynamic output mode, controlling the vehicle to be tested to run; Acquiring dynamic test parameters and body state parameters of the vehicle to be tested when it is in a running state; Calculating a dynamic output torque based on the dynamic test parameters and the vehicle model parameters; The dynamic output torque is set as the target output torque.

5. The vehicle chassis performance testing method according to claim 4, wherein: The dynamic test parameters include vehicle longitudinal speed, wind speed and steering wheel angular velocity; the vehicle body state parameters include front wheel longitudinal force at the front tire contact center, rear wheel longitudinal force at the rear tire contact center, gravitational acceleration, ramp angle, vehicle mass, center of mass height, front axle distance from the front axle to the center of mass, rear axle distance from the rear axle to the center of mass, number of tires on the front and rear axles, air resistance coefficient, air density, frontal area, motor efficiency, electric cylinder output thrust, screw lead and screw radius; the dynamic output torque is calculated based on the dynamic test parameters and the vehicle model parameters, including: Calculating the traction force on the vehicle to be tested according to the front wheel longitudinal force, the rear wheel longitudinal force and the number of tires on the front and rear axles; Calculating the air resistance of the vehicle to be tested based on the air resistance coefficient, the air density, the frontal area, the longitudinal speed of the vehicle, and the wind speed; Calculating the longitudinal force of the vehicle to be tested in the longitudinal direction according to the traction, the air resistance, the vehicle mass, the acceleration of gravity, and the ramp angle; Calculate the front wheel normal force at the center of contact of the front tire and the rear wheel normal force at the center of contact of the rear tire of the vehicle to be tested according to the air resistance, the center of mass height, the vehicle mass, the ramp angle, the front axle distance, the rear axle distance, and the longitudinal force; Calculating the steering resistance of the vehicle to be tested according to a preset test coefficient and the steering wheel angular velocity; Calculating the front wheel friction coefficient and the rear wheel friction coefficient respectively according to the front wheel normal force, the rear wheel normal force and the electric cylinder output thrust; Calculating the front wheel real-time output torque and the rear wheel real-time output torque respectively according to the front wheel friction coefficient, the rear wheel friction coefficient, the electric cylinder output thrust, the screw lead, the screw radius and the motor efficiency; The front wheel real-time output torque and the rear wheel real-time output torque are set as the dynamic output torque.

6. The vehicle chassis performance testing method according to claim 5, characterized in that: The method of calculating the front wheel real-time output torque and the rear wheel real-time output torque respectively according to the front wheel friction coefficient, the rear wheel friction coefficient, the electric cylinder output thrust, the screw lead, the screw radius and the motor efficiency includes: The front wheel real-time output torque and the rear wheel real-time output torque are calculated using the following formulas: Among them, T f is the real-time output torque of the front wheel, T r is the real-time output torque of the rear wheel, F is the steering resistance, ζ f is the front wheel friction coefficient, ζ r is the rear wheel friction coefficient, R is the screw radius, L is the screw lead, N is the motor efficiency, P and k are the preset test coefficients, V p is the steering wheel angular velocity.

7. The vehicle chassis performance testing method according to claim 1, wherein: Obtaining the target output torque according to the test mode includes: If the test mode is the static output mode, controlling the vehicle to be tested to run according to at least one input steering wheel angle; Obtaining a static input force curve of the vehicle to be tested when the vehicle is in the state of steering wheel angle operation; Obtaining a static output torque according to the static input force curve; The static output torque is set as the target output torque.

8. The vehicle chassis performance testing method according to any one of claims 1 to 7, characterized in that: The step of generating a chassis performance test report of the vehicle to be tested according to the real-time output torque and the target output torque also includes: If the real-time output torque is different from the target output torque, calculating a deviation between the real-time output torque and the target output torque; The PID algorithm is used to take the deviation value as an input value to adjust the real-time output torque.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and when a computer executes the computer instructions, it is used to execute all steps of the vehicle chassis performance testing method according to any one of claims 1 to 8.

10. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the vehicle chassis performance testing method according to any one of claims 1 to 8.

Images