A robust control system and control method for an automobile air suspension

Abstract

The invention discloses a robust control system of an automobile air suspension and a control method thereof, comprising a sensor group, a GPS navigation module, a control module and an actuator, the control module receives signals collected by the sensor group and the GPS navigation module, and establishes an ECAS The dynamic model is used to solve the robust controller K, aiming to minimize the weighted sum of the dynamic deflection of the suspension, the vertical acceleration of the wheel and the vertical acceleration of the vehicle body, and obtain the required stiffness of the air spring, and adjust it through the opening and closing of the volume solenoid valve Stiffness of the air spring. The augmented ECAS vehicle model established by the present invention integrates load, stiffness and other changes, road surface disturbance and ECAS vehicle dynamics nominal model, and introduces structural singular value μ theory and small gain theory to analyze and synthesize the augmented model to solve The robust controller K can make the ECAS system have robust performance while maintaining robust stability, and can greatly improve the controllability of the air suspension under the condition of inheriting most of the hardware of the original system.

Description

technical field [0001] The invention relates to the field of automotive electronic control, in particular to a robust control system of an air suspension and a control method thereof. Background technique [0002] Air suspension (Air Suspension) was born at the end of the 19th century. Compared with leaf spring suspension, it has the characteristics of anti-"S" stiffness curve, which can improve the ride comfort of the car and keep the height of the vehicle body unchanged. Therefore, in developed European and American automobile industries, air suspension is widely used in high-end passenger cars, heavy trucks, medium trucks, trailers, special vehicles (instrument vehicles with high vibration isolation requirements, ambulances, etc.) and luxury passenger cars. In the 1980s, with the development of electronic control technology, a relatively mature electronically controlled air suspension appeared. Compared with the traditional air suspension, it can further improve the overa...

AI Technical Summary

Problems solved by technology

However, due to the wide variety of control objects, a unified and mature theory has not yet been established.

As far as the electronic control process of ECAS is concerned, it involves subject theories such as aerodynamics, engineering thermodynamics, vehicle dynamics, electronics and modern control theory, coupled with the influence of model parameter changes, external disturbances and unmodeled errors, It makes the design and development of its control system very complicated

Images