Multi-mode switching control method for stiffness damping of electronic control air suspension

Abstract

The invention discloses a multi-mode switching control method for stiffness damping of an electric control air suspension, which comprises the following steps of: 1, forming a stiffness variation range of the air suspension according to sprung load and suspension offset frequency requirements, and further determining a stiffness working mode of an air spring; 2, forming a damping change range of the air suspension, and further determining a damping working mode of a shock absorber; 3, establishing a mathematical model of a vehicle suspension system; 4, performing model simulation according to different driving working conditions and different rigidity damping working modes, and comparing the comprehensive performance of the air suspension; 5, according to a simulation comparison result, determining an optimal rigidity damping mode combination under different driving working conditions; 6, formulating discrimination conditions among different driving working conditions; and 7, carrying out rigidity damping switching control performance simulation on the electronic control air suspension, and verifying a switching control effect. According to the invention, the multi-mode switching control of rigidity damping of the electronic control air suspension can be realized, and a good basis is provided for improving the comprehensive performance of the vehicle air suspension system.

Description

technical field [0001] The invention relates to a multi-mode switching control method for stiffness damping of an electronically controlled air suspension, belonging to the technical field of vehicle suspension system control. Background technique [0002] The suspension system affects the main performance of the car such as handling stability, ride comfort, and tire grounding. The main function of the elastic element in the suspension system is to provide elastic force, buffer the impact of the road on the car, and improve the ride comfort. With the rapid development of my country's transportation industry, people have put forward higher requirements for vehicle ride comfort and handling stability. Once the parameters of the traditional passive suspension system such as spring stiffness and shock absorber damping coefficient are determined, the suspension stiffness and damping will not change. No matter how adjustable, the corresponding parameters cannot be adjusted in real...

AI Technical Summary

Problems solved by technology

However, most of these studies focus on the control strategy design of the electronically controlled air suspension system whose stiffness and damping characteristics can be continuously adjusted. Although the dynamic performance of the system has been significantly improved, from the perspective of practical engineering applications, there are still improvements in the existing research. space

On the one hand, in order to realize the continuous adjustment of the stiffness and damping characteristics of the electronically controlled air suspension, it is generally necessary to install an expensive servo solenoid valve in the system. However, in the actual control process, it is difficult to construct an accurate servo solenoid valve model, and the time lag The impact of factors on the real-time control performance of the servo solenoid valve is also obvious; on the other hand, combined with the mechanism of vehicle vibration characteristics, the suspension stiffness and damping characteristics need to be actively adjusted within a certain range, but the parameter fluctuations in a small range will not affect Significant impact on suspension dynamics

Therefore, how to break through the technical bottleneck that traditional research cannot effectively coordinate the contradiction between system cost and control difficulty and the overall dynamic performance requirements of electronically controlled air suspension has important research significance and engineering application value

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