CN-122008760-A - Method and system for cooperatively controlling rigidity of air spring and suspension bushing

CN122008760ACN 122008760 ACN122008760 ACN 122008760ACN-122008760-A

Abstract

The application relates to a method and a system for cooperatively controlling stiffness of an air spring and a suspension bushing, wherein the method comprises the steps of acquiring a current steering stability index parameter of the vehicle based on a transverse motion state parameter of the vehicle, acquiring a current smoothness index parameter of the vehicle based on a vertical motion state parameter of the vehicle, setting a target steering stability threshold and a target smoothness threshold according to the current steering stability index parameter of the vehicle and the current smoothness index parameter of the vehicle, cooperatively determining a target stiffness value of the air spring and a target stiffness value of the suspension bushing based on the target steering stability threshold and the target smoothness threshold and according to a coupling relation between the stiffness of the air spring and the stiffness of the suspension bushing, and adjusting the stiffness of the air spring and the stiffness of the suspension bushing to corresponding target stiffness values. In the application, the target stiffness value of the air spring and the target stiffness value of the suspension bushing are cooperatively determined according to the coupling relation between the stiffness of the air spring and the stiffness of the suspension bushing.

Inventors

KANG JIE
TAO SHUJIE
JING HAIHONG
TANG YADONG
YANG CHENG

Assignees

东风汽车集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260325

Claims (10)

1. The method for cooperatively controlling the rigidity of the air spring and the suspension bushing is characterized by comprising the following steps of: acquiring a current steering stability index parameter of the vehicle based on the vehicle transverse motion state parameter; acquiring current smoothness index parameters of the vehicle based on the vertical motion state parameters of the vehicle; Setting a target operating stability threshold and a target smoothness threshold according to the current operating stability index parameter and the current smoothness index parameter of the vehicle; based on a target steering stability threshold value and a target smoothness threshold value, and according to a coupling relation between the stiffness of the air spring and the stiffness of the suspension bush, cooperatively determining a target stiffness value of the air spring and a target stiffness value of the suspension bush; The air spring stiffness and suspension bushing stiffness are adjusted to corresponding target stiffness values.
2. The method for controlling stiffness coordination of an air spring and a suspension bushing according to claim 1, wherein the setting of the target steering stability threshold and the target ride quality threshold according to the current steering stability index parameter and the current ride quality index parameter of the vehicle specifically comprises: acquiring ideal steering stability index parameters and ideal smoothness index parameters corresponding to a current driving mode based on a preset vehicle performance mapping table; Setting a target steering stability threshold based on the ideal steering stability index parameter and the current steering stability index parameter of the vehicle; And setting a target smoothness threshold based on the ideal smoothness index parameter and the current smoothness index parameter of the vehicle.
3. The cooperative control method of stiffness of an air spring and a suspension bushing according to claim 1, wherein the cooperative determination of the target stiffness value of the air spring and the target stiffness value of the suspension bushing is based on a target steering stability threshold and a target ride threshold and based on a coupling relationship between stiffness of the air spring and stiffness of the suspension bushing, specifically comprising: acquiring a target stiffness value of the air spring based on the target steering stability threshold and the target smoothness threshold; And based on the target steering stability threshold value and the target smoothness threshold value, carrying out collaborative matching calculation by combining the target stiffness value of the air spring, and obtaining the target stiffness value of the suspension bushing.
4. The method for cooperative control of stiffness of an air spring and a suspension bushing according to claim 3, wherein the obtaining a target stiffness value of the air spring based on a target steering stability threshold and a target ride threshold specifically comprises: establishing a coupling model of the air spring stiffness and the current steering stability index parameter of the vehicle and the current smoothness index parameter of the vehicle; Based on the coupling model, establishing an air spring stiffness value comprehensive performance evaluation function; Performing iterative calculation on the air spring stiffness value within a preset air spring stiffness feasible range by taking the minimum air spring stiffness value comprehensive performance evaluation function as a target; and when the air spring stiffness value comprehensive performance evaluation function meets a convergence criterion, taking the current corresponding air spring stiffness value as a target stiffness value of the air spring.
5. The method for cooperatively controlling the stiffness of an air spring and a suspension bushing according to claim 4, wherein said air spring stiffness value comprehensive performance evaluation function satisfies a convergence criterion condition comprises: and the variation of the air spring stiffness value comprehensive performance evaluation function is lower than a first set threshold value.
6. The method for cooperatively controlling the stiffness of an air spring and a suspension bushing according to claim 3, wherein the method for cooperatively matching the stiffness of the suspension bushing with the target stiffness value of the air spring based on a target steering stability threshold value and a target smoothness threshold value comprises the following steps: establishing a coupling model of the rigidity of the suspension bush and the index parameter of the vehicle operation stability, the index parameter of the vehicle smoothness and the target rigidity value of the air spring; based on the coupling model, establishing a suspension bushing rigidity value comprehensive performance evaluation function; Performing iterative calculation on the rigidity value of the suspension bush in a preset feasible range of the rigidity of the suspension bush by taking the minimization of the comprehensive performance evaluation function of the rigidity value of the suspension bush as a target; And when the comprehensive performance evaluation function of the rigidity values of the suspension bushes meets a convergence criterion, taking the rigidity value of the currently corresponding suspension bush as a target rigidity value of the suspension bush.
7. The air spring and suspension bushing stiffness cooperative control method of claim 6, wherein the suspension bushing stiffness value comprehensive performance evaluation function satisfies a convergence criterion condition comprising: And the variation of the suspension bush rigidity value comprehensive performance evaluation function is lower than a second set threshold value.
8. The air spring and suspension bushing stiffness cooperative control method of claim 1, wherein after adjusting the air spring stiffness and suspension bushing stiffness to corresponding target stiffness values, the method further comprises: Acquiring an actual steering stability index and an actual smoothness index of the vehicle under a current target stiffness value; comparing the actual manipulation stability index and the actual smoothness index with the target manipulation stability threshold and the target smoothness threshold respectively; And if the comparison result does not meet the threshold requirement, the target stiffness value of the air spring and the target stiffness value of the suspension bush are obtained again until the comparison result meets the threshold requirement.
9. The air spring and suspension bushing stiffness cooperative control method of claim 1, wherein: The vehicle transverse motion state parameters comprise vehicle transverse acceleration and steering wheel rotation angle change rate; the vehicle vertical motion state parameters comprise vehicle vertical acceleration and vehicle body vibration amplitude.
10. An air spring and suspension bushing stiffness cooperative control system, comprising: The first module is used for acquiring the current steering stability index parameter of the vehicle based on the transverse motion state parameter of the vehicle and acquiring the current smoothness index parameter of the vehicle based on the vertical motion state parameter of the vehicle; the second module is used for setting a target operating stability threshold value and a target smoothness threshold value according to the current operating stability index parameter of the vehicle and the current smoothness index parameter of the vehicle; a third module for cooperatively determining a target stiffness value of the air spring and a target stiffness value of the suspension bushing based on a target steering stability threshold and a target ride threshold and in accordance with a coupling relationship between an air spring stiffness and a suspension bushing stiffness; and a fourth module for adjusting the air spring rate and suspension bushing rate to corresponding target rate values.

Description

Method and system for cooperatively controlling rigidity of air spring and suspension bushing Technical Field The application relates to the field of vehicle suspension control, in particular to a method and a system for cooperatively controlling rigidity of an air spring and a suspension bushing. Background With the continuous development of the automobile industry technology, the NVH (noise, vibration and harshness) performance of a chassis system of a vehicle has become a key index for measuring the quality of the whole vehicle. In the design of suspension systems, air springs are widely used for improving riding comfort due to their stiffness-adjustable characteristics, while suspension bushings are used as connection key components, and their nonlinear stiffness characteristics have a significant effect on steering stability and smoothness. However, the prior art has focused on adjustment of a single component or optimization of static parameters, and lacks an overall solution for dynamic cooperative control of both, resulting in difficulty in thoroughly solving the inherent contradiction between steering stability and smoothness. Disclosure of Invention The application provides a method and a system for cooperatively controlling the rigidity of an air spring and a suspension bushing, which can solve the problems in the prior art that the adjustment or the static parameter optimization of a single component is focused and the overall solution for dynamically cooperatively controlling the air spring and the suspension bushing is lacked. In a first aspect, an embodiment of the present application provides a method for controlling stiffness of an air spring and a suspension bushing in a coordinated manner, including: acquiring a current steering stability index parameter of the vehicle based on the vehicle transverse motion state parameter; acquiring current smoothness index parameters of the vehicle based on the vertical motion state parameters of the vehicle; Setting a target operating stability threshold and a target smoothness threshold according to the current operating stability index parameter and the current smoothness index parameter of the vehicle; based on a target steering stability threshold value and a target smoothness threshold value, and according to a coupling relation between the stiffness of the air spring and the stiffness of the suspension bush, cooperatively determining a target stiffness value of the air spring and a target stiffness value of the suspension bush; The air spring stiffness and suspension bushing stiffness are adjusted to corresponding target stiffness values. With reference to the first aspect, in an embodiment, the setting the target steering stability threshold and the target smoothness threshold according to the current steering stability index parameter and the current smoothness index parameter of the vehicle specifically includes: acquiring ideal steering stability index parameters and ideal smoothness index parameters corresponding to a current driving mode based on a preset vehicle performance mapping table; Setting a target steering stability threshold based on the ideal steering stability index parameter and the current steering stability index parameter of the vehicle; And setting a target smoothness threshold based on the ideal smoothness index parameter and the current smoothness index parameter of the vehicle. With reference to the first aspect, in an embodiment, the determining, based on the target steering stability threshold and the target ride comfort threshold, the target stiffness value of the air spring and the target stiffness value of the suspension bushing cooperatively according to a coupling relationship between the stiffness of the air spring and the stiffness of the suspension bushing specifically includes: acquiring a target stiffness value of the air spring based on the target steering stability threshold and the target smoothness threshold; And based on the target steering stability threshold value and the target smoothness threshold value, carrying out collaborative matching calculation by combining the target stiffness value of the air spring, and obtaining the target stiffness value of the suspension bushing. With reference to the first aspect, in an implementation manner, the method is characterized in that, based on the target steering stability threshold value and the target smoothness threshold value, the method includes: establishing a coupling model of the air spring stiffness and the current steering stability index parameter of the vehicle and the current smoothness index parameter of the vehicle; Based on the coupling model, establishing an air spring stiffness value comprehensive performance evaluation function; Performing iterative calculation on the air spring stiffness value within a preset air spring stiffness feasible range by taking the minimum air spring stiffness value comprehensive performance evaluation function a