Real-time optimal damping control algorithm of automobile semi-active suspension system

Abstract

The invention relates to an optimal damping control algorithm of a continuous-control-type semi-active suspension system, and the optimal damping control algorithm is researched and developed for meeting the taking comfort of people and automobile driving safety requirements well. The control algorithm comprises the following steps of: measuring automobile body vibration acceleration signals, automobile speed signals and rotation angle signals by utilizing a sensor; sensing the automobile driving road condition and suspension system damping ratio according to the signals measured by the sensor; according to the measured automobile body and automobile wheel vibration acceleration, obtaining the automobile body and automobile wheel vertical motion speed and the relative motion speed between an automobile body and automobile wheels; determining the optimal damping coefficient and the damping force of a shock absorber required under the current automobile speed and road condition according to automobile parameters, outputting stepping motor rotation angle control signals through a controller, and controlling and regulating the area of the damping throttling hole of a controllable shock absorber, so that the semi-active suspension system achieves the required optimal damping and damping force. The semi-active suspension optimal damping control algorithm provided by the invention is simple and easy to implement, has low requirements for the dynamic property of an actuating element, and is beneficial to the applications and popularization of the semi-active suspension.

Description

technical field [0001] The invention relates to an automobile semi-active system, in particular to a damping control algorithm of an automobile semi-active suspension system. Background technique [0002] During the actual driving process of the car, the speed and road conditions are constantly changing. With the rapid development of the automobile industry and the continuous improvement of automobile driving speed, people put forward higher requirements for automobile driving safety and ride comfort. The damping control method of automobile semi-active suspension system has a crucial effect on the performance of the suspension, and it directly affects the handling stability, ride comfort and driving safety of the automobile. For the semi-active suspension system of a car, it is necessary to require its damping to be continuously adjustable with the speed of the car and the current road conditions of the car, so as to achieve the best ride comfort under the premise of ensur...

AI Technical Summary

Problems solved by technology

Among them, the most successful and widely used control method is the ceiling control method based on speed control and its improved control method. The semi-active suspension system using these two control methods has better vibration reduction performance than the passive suspension. However, none of them can guarantee the improvement of handling stability, and have not solved the contradiction between ride comfort and handling stability of the suspension system.

Domestic and foreign vehicle engineering experts have conducted a lot of research on the damping ratio of semi-active suspensions. They have established the objective function based on the vibration acceleration of the vehicle body or the dynamic load of the wheels, and have studied the damping matching of the suspension system. However, due to the suspension damping ratio The ride comfort and driving safety of the vehicle, and the two are mutually contradictory and affect each other

According to the information we have consulted, at present, domestic and foreign countries have not been able to establish a real-time optimal damping ratio mathematical model that combines safety and comfort under different driving conditions. The design of semi-active suspension can only be based on the damping ratio of passive suspension. In the feasibility design area (0.2-0.5), according to the vehicle type and driving conditions, a limited number (2 or 3) of damping ratios are selected based on experience, and the throttle valve parameters of the controllable shock absorber are designed. It is difficult to make the vehicle achieve the best vibration damping effect

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