Robust control system for automobile air suspension and control method for robust control system

Abstract

The invention discloses a robust control system for an automobile air suspension and a control method for the robust control system. The robust control system comprises a sensor group, a GPS navigation module, a control module and an execution mechanism. The control module receives signals acquired by the sensor group and the GPS navigation module, a robust controller K is obtained through calculation by establishment of an ECAS dynamic model, the minimum weighing sum of the suspension dynamic deflection, the wheel vertical acceleration and the automobile body vertical acceleration serves as a target, the rigidity required by an air spring is obtained, and the rigidity of the air spring is adjusted through opening and closing of a volume electromagnetic valve. Changes of the load, the rigidity and the like, road surface disturbance and an ECAS automobile dynamic nominal model are integrated on an established augmentation ECAS automobile model, a structure singular value Mu theory and a small gain theory are introduced for analyzing and integrating the augmentation model, the robust controller K obtained through calculation can make an ECAS system having the robust performance while the keeping robust stability, and the control performance of the air suspension can be greatly improved under the condition that the majority of hardware of an original system is inherited.

Description

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

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

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