Vehicle primary smoothness processing evaluation method and device

Abstract

The invention discloses a vehicle primary smoothness processing evaluation method and device. The method comprises the following steps: collecting vehicle signal data of a vehicle in a test environment; analyzing and calculating the pitch angle and the roll angle of the vehicle body relative to the wheels based on the vehicle signal data; and evaluating suspension rigidity and damping of the vehicle based on the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels so as to realize vehicle smoothness evaluation. The method has the advantages that the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels are obtained in a quantitative calculation mode, quantitative evaluation on the smoothness of the vehicle is achieved based on the pitch angle and the roll angle, and quantitative evaluation on the rigidity and damping of the chassis suspension is met.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle testing, and in particular to a method and device for processing and evaluating vehicle primary ride comfort data. Background Art

[0002] In the process of chassis performance development of passenger cars, it is particularly important to accurately test the driving smoothness of the car under standard working conditions, and to post-process and objectively evaluate the test data. With the increasing requirements for driving smoothness of passenger cars, especially the primary smoothness of pure electric models, the post-processing and evaluation methods of primary smoothness test data of automobiles have been widely used in the development of vehicle performance.

[0003] The primary ride comfort evaluation method of the prior art includes: 1. Using a multi-channel data acquisition system and sensors to collect the center of mass pitch angle and roll angle signals when the vehicle passes through a specific road condition at a constant speed; 2. Importing the source data into Matlab numerical analysis software; 3. Performing zero-phase shift low-pass filtering on the source data; 4. Calculating the pitch angle of the vehicle body relative to the ground; 5. Calculating the roll angle of the vehicle body relative to the ground.

[0004] In the prior art, the vehicle's ride comfort is evaluated by obtaining the pitch angle and the roll angle of the vehicle body to the ground through analysis software, and quantitative comparison and evaluation of the ride comfort is achieved based on the comparison of these two parameters.

[0005] However, this evaluation method still has the following defects: this method can only evaluate the pitch angle displacement of the vehicle's center of mass, cannot directly reflect the control of suspension stiffness and damping on the pitch motion of the vehicle body, has a poor correlation with the subjective evaluation results of the vehicle body bounce displacement and pitch motion in primary smoothness, and cannot effectively guide chassis tuning and development. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a vehicle primary smoothness data processing and evaluation method and device for directly and objectively quantitatively evaluating the control of suspension stiffness and damping on the pitch motion of the vehicle body by calculating and evaluating the vertical / pitch / roll motion of the vehicle body relative to the wheels, which can effectively guide the chassis tuning and development.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a vehicle primary ride comfort data processing and evaluation method, comprising the following steps:

[0008] Collect vehicle signal data of the vehicle in the test environment; calculate the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels based on the vehicle signal data analysis; evaluate the suspension stiffness and damping of the vehicle based on the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels to achieve vehicle smoothness evaluation.

[0009] When calculating the pitch angle of the vehicle body relative to the wheels, vibration acceleration signals on the vehicle body and wheels under the test conditions are collected, and the pitch angle of the vehicle body relative to the wheels is calculated based on the vibration acceleration signals.

[0010] When calculating the pitch angle of the vehicle body relative to the wheels, the displacement of the four wheels relative to the vehicle body is calculated based on the vibration acceleration signal using the frequency domain quadratic integration method, and the pitch angle of the vehicle body relative to the wheels is calculated in combination with the vehicle wheelbase parameters and the front and rear body bounce displacements.

[0011] When calculating the roll angle of the vehicle body relative to the wheels, vibration acceleration signals on the vehicle body and wheels under test conditions are collected, and the roll angle of the vehicle body relative to the wheels is calculated based on the vibration acceleration signals.

[0012] The vibration acceleration signals of multiple points on the vehicle body and the four wheels are collected, and the displacement of the four wheels relative to the vehicle body is calculated using the frequency domain quadratic integration method. The roll angle of the vehicle body relative to the wheels is calculated by combining the wheelbase parameters and the left and right body bounce displacements.

[0013] The source data of the collected vibration acceleration signal is calculated, and the calculation includes:

[0014] S1, perform zero-phase shift low-pass filtering on the source data;

[0015] S2. Perform a frequency domain quadratic integration operation on the filtered vibration acceleration data to obtain vibration displacement data.

[0016] Step S2 is used to calculate the wheel and body displacement data in the same time domain. The body displacement minus the wheel displacement is used to obtain the four body position displacement data corresponding to the four wheels and the root mean square value is calculated to obtain the vertical runout displacement index of the body relative to the wheel.

[0017] The two displacement data of the front wheels are averaged to obtain the average displacement value of the front wheels, the two displacement data of the rear wheels are averaged to obtain the average displacement value of the rear wheels, and the average displacement value of the front wheels is divided by the average displacement value of the rear wheels to obtain the vehicle body bounce displacement balance index.

[0018] The calculated vertical bouncing displacement index of the front and rear vehicle bodies relative to the wheels and the wheelbase parameter are used to calculate the pitch angle of the vehicle body relative to the wheels; the root mean square value of the calculated pitch angle is calculated to obtain an evaluation index of the pitch angle of the vehicle body relative to the wheels.

[0019] The roll angles of the front and rear bodies relative to the wheels are calculated using the calculated vertical bouncing displacement index of the front and rear bodies relative to the wheels and the wheelbase parameter; the RMS value of the calculated roll angles is calculated to obtain an evaluation index of the roll angles of the front and rear bodies relative to the wheels; the roll angle of the front body relative to the wheels is divided by the roll angle of the rear body relative to the wheels to obtain an evaluation index of the roll balance of the entire vehicle.

[0020] A vehicle primary ride comfort data processing and evaluation device, the device comprises a data acquisition module, a pitch angle calculation module, a roll angle calculation module and an evaluation module, wherein the data acquisition module is used to collect vehicle signal data of the vehicle under a test environment; the pitch angle calculation module calculates and obtains the pitch angle of the vehicle body relative to the wheels based on vehicle signal data analysis; the roll angle calculation module calculates and obtains the roll angle of the vehicle body relative to the wheels based on vehicle signal data analysis; and the evaluation module evaluates the suspension stiffness and damping of the vehicle based on the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels to achieve vehicle ride comfort evaluation.

[0021] The advantages of the present invention are as follows: the pitch angle of the vehicle body relative to the wheel and the roll angle of the vehicle body relative to the wheel are obtained by quantitative calculation, and based on the pitch angle and the roll angle, a quantitative evaluation of the vehicle smoothness is achieved, which satisfies the quantitative evaluation of the chassis suspension stiffness and damping, provides basic reference evaluation data for the development and adjustment of the chassis, and effectively guides the chassis development work of the main engine manufacturer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0023] Figure 1 The figure is a schematic diagram of the process of the rating method of the present invention. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0025] The present invention proposes a quantitative evaluation for the ride comfort of a vehicle. The evaluation parameters obtained by calculation can provide basic parameters for chassis adjustment. Compared with the evaluation parameters of the prior art, the chassis performance can be better reflected.

[0026] A method for processing and evaluating vehicle primary ride comfort data comprises the following steps:

[0027] Collect vehicle signal data of the vehicle in the test environment; calculate the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels based on the vehicle signal data analysis; evaluate the suspension stiffness and damping of the vehicle based on the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels to achieve vehicle smoothness evaluation.

[0028] The vehicle test condition refers to collecting vibration acceleration signals under the vehicle test condition through a multi-channel data acquisition system and sensors when the vehicle passes through a specific road condition at a constant speed. The sensors include four body sensors and four wheel sensors. The four wheel sensors are arranged on the four wheels of the vehicle to measure the vibration acceleration signals of each wheel respectively. The four body sensors are arranged at four points on the body to measure the vibration acceleration signals at four points on the body. The positions of the four points on the body are respectively arranged on the body at the positions corresponding to the four wheels.

[0029] When calculating the pitch angle of the vehicle body relative to the wheels, the vibration acceleration signals on the vehicle body and wheels under the test conditions are collected, and the pitch angle of the vehicle body relative to the wheels is calculated based on the vibration acceleration signals. When calculating the pitch angle of the vehicle body relative to the wheels, the displacement of the four wheels relative to the vehicle body is calculated using the frequency domain quadratic integration method based on the vibration acceleration signals, and the pitch angle of the vehicle body relative to the wheels is calculated in combination with the vehicle wheelbase parameters and the front and rear body bounce displacements.

[0030] The roll angle of the vehicle body relative to the wheels is obtained by collecting vibration acceleration signals on the vehicle body and wheels under test conditions, and calculating the roll angle of the vehicle body relative to the wheels based on the vibration acceleration signals.

[0031] The specific method for calculating the pitch angle and roll angle of the vehicle body relative to the wheels is as follows: collect vibration acceleration signals at multiple points on the vehicle body and the four wheels, use the frequency domain quadratic integration method to calculate the displacement of the four wheels relative to the vehicle body, and combine the entire wheelbase parameters and the left and right body bounce displacement to calculate the roll angle of the vehicle body relative to the wheels.

[0032] The source data of the collected vibration acceleration signal is calculated, and the calculation includes:

[0033] S1, perform zero-phase shift low-pass filtering on the source data;

[0034] S2. Perform a frequency domain quadratic integration operation on the filtered vibration acceleration data to obtain vibration displacement data.

[0035] Step S2 is used to calculate the wheel and body displacement data in the same time domain. The body displacement minus the wheel displacement is used to obtain the four body position displacement data corresponding to the four wheels and the root mean square value is calculated to obtain the vertical runout displacement index of the body relative to the wheel.

[0036] The two displacement data of the front wheels are averaged to obtain the average displacement value of the front wheels, the two displacement data of the rear wheels are averaged to obtain the average displacement value of the rear wheels, and the average displacement value of the front wheels is divided by the average displacement value of the rear wheels to obtain the vehicle body bounce displacement balance index.

[0037] The calculated vertical bouncing displacement index of the front and rear vehicle bodies relative to the wheels and the wheelbase parameter are used to calculate the pitch angle of the vehicle body relative to the wheels; the root mean square value of the calculated pitch angle is calculated to obtain an evaluation index of the pitch angle of the vehicle body relative to the wheels.

[0038] The roll angles of the front and rear bodies relative to the wheels are calculated using the calculated vertical bouncing displacement index of the front and rear bodies relative to the wheels and the wheelbase parameter; the RMS value of the calculated roll angles is calculated to obtain an evaluation index of the roll angles of the front and rear bodies relative to the wheels; the roll angle of the front body relative to the wheels is divided by the roll angle of the rear body relative to the wheels to obtain an evaluation index of the roll balance of the entire vehicle.

[0039] The pitch angle and roll angle of the vehicle relative to the wheels measured by the above scheme, as well as the evaluation index calculated based on the pitch angle and roll angle, can be used to quantitatively evaluate the chassis suspension stiffness and damping of a vehicle when applied to vehicle smoothness evaluation. The smoothness of the vehicle can be evaluated in a quantitative manner, and a comparison can be made based on a quantitative manner to compare the smoothness results of the vehicle with those of competing vehicles or other models, providing basic evaluation parameters for vehicle development and chassis debugging.

[0040] The present solution also provides a vehicle primary ride comfort data processing and evaluation device, the device includes a data acquisition module, a pitch angle calculation module, a roll angle calculation module and an evaluation module, wherein the data acquisition module is used to collect vehicle signal data of the vehicle under the test environment; the pitch angle calculation module calculates and obtains the pitch angle of the vehicle body relative to the wheel based on the vehicle signal data analysis; the roll angle calculation module calculates and obtains the roll angle of the vehicle body relative to the wheel based on the vehicle signal data analysis; the evaluation module evaluates the suspension stiffness and damping of the vehicle based on the pitch angle of the vehicle body relative to the wheel and the roll angle of the vehicle body relative to the wheel to achieve vehicle ride comfort evaluation. The evaluation module evaluates the calculated pitch angle and roll angle based on the pre-set evaluation rules to obtain the vehicle ride comfort index, such as setting the pitch angle and roll angle value ranges corresponding to several levels such as excellent, good, general, and poor, and judging which level the ride comfort belongs to among excellent, general, or poor according to the value range, thereby achieving evaluation.

[0041] In order to solve the problem that the existing objective test and evaluation methods mentioned in the technical defects mentioned in the background technology cannot effectively guide the development of primary ride comfort. This method collects the vibration acceleration signals at 4 points on the vehicle body and 4 wheels as the test source data, calculates the displacement of the 4 wheels relative to the vehicle body by using the frequency domain quadratic integration method, and calculates the pitch angle of the vehicle body relative to the wheels by combining the wheelbase parameters of the whole vehicle and the front and rear body bounce displacements. It can directly and objectively quantitatively evaluate the control of suspension stiffness and damping on the pitch motion of the vehicle body, and effectively guide the chassis tuning and development.

[0042] For details on the technical route of this solution, please see Figure 1The core technology is to calculate the displacement of the four wheels relative to the vehicle body and the pitch / roll angle of the vehicle body relative to the wheels by using the frequency domain quadratic integration method. The specific steps are as follows:

[0043] 1. Import the source data into Matlab numerical analysis software. Analyze and process the source data through MATLAB numerical analysis software to quickly calculate or obtain the required data; the source data refers to the vibration acceleration signal data of the four points of the vehicle body and the four wheels obtained by the sensor.

[0044] 2. Perform zero-phase-shift low-pass filtering on the source data.

[0045] 3. Perform a frequency domain quadratic integration operation on the filtered vibration acceleration data to obtain vibration displacement data. The specific calculation and processing method includes the following steps:

[0046] a. Perform FFT transformation on vibration acceleration data;

[0047] b. Establish discrete circular frequency vector;

[0048] c. Establish the circular frequency variable vector;

[0049] d. Perform frequency domain transformation of the integral;

[0050] e. Performing a phase shift of a second integral;

[0051] f. Perform an integral phase shift;

[0052] g. Eliminate frequency components outside the specified positive / negative frequency band;

[0053] h. Perform IFFT transformation on frequency domain data;

[0054] i. Take the real part n elements of the inverse transform and multiply them by the unit transform coefficient to get the quadratic integral result.

[0055] 4. Calculate the vertical displacement and balance of the vehicle body relative to the wheels. This calculation step is the core of this method. The specific steps are described in detail below:

[0056] a. Using the wheel and body displacement data calculated in step 3 in the same time domain,

[0057] Subtract the wheel displacement from the body displacement to obtain the 4 body position displacement data corresponding to the 4 wheels and calculate the RMS value to obtain the vertical runout displacement index of the body relative to the wheel;

[0058] b. Among the 4 body position displacement data corresponding to the 4 wheels, take the average of the body displacement data values ​​corresponding to the front 2 wheels, take the average of the body displacement data values ​​corresponding to the rear 2 wheels, and divide the front average value by the rear average value to obtain the body bounce displacement balance index.

[0059] 5. Calculate the pitch angle of the vehicle body relative to the wheels. The calculation method is one of the core points of this solution. The specific steps include:

[0060] a. Use the vertical displacement index of the front and rear body relative to the wheel calculated in step 4

[0061] Calculate the pitch angle of the vehicle body relative to the wheels using the wheelbase parameters;

[0062] b. Calculate the RMS value of the pitch angle calculated in the previous step to obtain the evaluation index of the pitch angle of the vehicle body relative to the wheels.

[0063] 6. Calculate the roll angle and balance of the vehicle body relative to the wheels. The specific calculation steps include:

[0064] a. Calculate the roll angle of the front and rear vehicle bodies relative to the wheels using the vertical runout displacement index of the front and rear vehicle bodies relative to the wheels and the wheelbase parameter calculated in step 4;

[0065] b. Calculate the root mean square value of the roll angle calculated in the previous step to obtain an evaluation index of the roll angle of the front and rear vehicles relative to the wheels;

[0066] c. The roll angle of the front body relative to the wheels divided by the roll angle of the rear body relative to the wheels gives the vehicle roll balance evaluation index.

[0067] The evaluation indicators and other parameters calculated by the above scheme can quantitatively evaluate the vehicle's ride comfort or evaluate its chassis suspension stiffness and damping, providing basic evaluation parameters for vehicle development and debugging. Its technical advantages include:

[0068] First, calculating and evaluating the vertical / pitch / roll motion of the vehicle body relative to the wheels can directly and objectively and quantitatively evaluate the control of suspension stiffness and damping on the pitch motion of the vehicle body, which can effectively guide chassis tuning and development. Second, measuring the vibration acceleration signal, calculating and quantitatively evaluating the motion of the vehicle body relative to the wheels through post-processing, can effectively avoid the influence of differences in test road surfaces.

[0069] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A method for evaluating primary vehicle ride comfort handling, characterized in that: The steps include: Collect vehicle signal data of the vehicle in the test environment; calculate the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels based on the vehicle signal data analysis; The vehicle's suspension stiffness and damping are evaluated based on the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels to achieve vehicle smoothness evaluation.

2. A vehicle primary ride comfort handling evaluation method as claimed in claim 1, characterized in that: When calculating the pitch angle of the vehicle body relative to the wheels, vibration acceleration signals on the vehicle body and wheels under the test conditions are collected, and the pitch angle of the vehicle body relative to the wheels is calculated based on the vibration acceleration signals.

3. A vehicle primary ride comfort handling evaluation method as claimed in claim 2, characterized in that: When calculating the pitch angle of the vehicle body relative to the wheels, based on the vibration acceleration signal, the frequency domain quadratic integration method is used to calculate the displacement of the four wheels relative to the vehicle body, and the pitch angle of the vehicle body relative to the wheels is calculated in combination with the vehicle wheelbase parameters and the front and rear body bounce displacements.

4. A vehicle primary ride comfort handling evaluation method as claimed in claim 1, characterized in that: The roll angle of the vehicle body relative to the wheels is obtained by collecting vibration acceleration signals on the vehicle body and wheels under test conditions, and calculating the roll angle of the vehicle body relative to the wheels based on the vibration acceleration signals.

5. A vehicle primary ride comfort handling evaluation method as claimed in claim 4, characterized in that: The vibration acceleration signals of multiple points on the vehicle body and the four wheels are collected, and the displacement of the four wheels relative to the vehicle body is calculated using the frequency domain quadratic integration method. The roll angle of the vehicle body relative to the wheels is calculated by combining the wheelbase parameters and the left and right body bounce displacements.

6. A vehicle primary ride comfort processing evaluation method according to any one of claims 1 to 5, characterized in that: The source data of the collected vibration acceleration signal is calculated, and the calculation includes: S1, perform zero-phase shift low-pass filtering on the source data; S2. Perform a frequency domain quadratic integration operation on the filtered vibration acceleration data to obtain vibration displacement data.

7. A vehicle primary ride comfort handling evaluation method as claimed in claim 6, characterized in that: Step S2 is used to calculate the wheel and body displacement data in the same time domain. The body displacement minus the wheel displacement is used to obtain the four body position displacement data corresponding to the four wheels and the root mean square value is calculated to obtain the vertical runout displacement index of the body relative to the wheel. The two displacement data of the front wheels are averaged to obtain the average displacement value of the front wheels, the two displacement data of the rear wheels are averaged to obtain the average displacement value of the rear wheels, and the average displacement value of the front wheels is divided by the average displacement value of the rear wheels to obtain the vehicle body bounce displacement balance index.

8. A vehicle primary ride comfort handling evaluation method as claimed in claim 7, characterized in that: The calculated vertical bouncing displacement index of the front and rear vehicle bodies relative to the wheels and the wheelbase parameter are used to calculate the pitch angle of the vehicle body relative to the wheels; the root mean square value of the calculated pitch angle is calculated to obtain an evaluation index of the pitch angle of the vehicle body relative to the wheels.

9. A vehicle primary ride comfort handling evaluation method as claimed in claim 8, characterized in that: The roll angles of the front and rear bodies relative to the wheels are calculated using the calculated vertical bouncing displacement index of the front and rear bodies relative to the wheels and the wheelbase parameter; the RMS value of the calculated roll angles is calculated to obtain an evaluation index of the roll angles of the front and rear bodies relative to the wheels; the roll angle of the front body relative to the wheels is divided by the roll angle of the rear body relative to the wheels to obtain an evaluation index of the roll balance of the entire vehicle.

10. A vehicle primary ride comfort handling evaluation device, characterized in that: The device comprises a data acquisition module, a pitch angle calculation module, a roll angle calculation module and an evaluation module, wherein the data acquisition module is used to collect vehicle signal data of the vehicle under a test environment; the pitch angle calculation module calculates and obtains the pitch angle of the vehicle body relative to the wheels based on the vehicle signal data analysis; the roll angle calculation module calculates and obtains the roll angle of the vehicle body relative to the wheels based on the vehicle signal data analysis; and the evaluation module evaluates the suspension stiffness and damping of the vehicle based on the pitch angle of the vehicle body relative to the wheels and the roll angle of the vehicle body relative to the wheels to achieve vehicle smoothness evaluation.

Images