The Intelligent Controlling Of The Automobile Semi-Active Suspension

The automobile suspension system is playing the very important role to coordinate the automobile to ride comfortableness and the operation stable aspect. As a result of its own inherent limitation, the traditional passive suspension is unable make the appropriate readjustment according to the road surface and the travel condition change, thus enabling the whole driving quality of the automobile to achieve best. Development of new automobile suspension is imperative. Because it can improve the automobile the whole driving performance, the electrically controlled suspension is paid more and more attention. Due to the simple structure and the low cost, the semi-active suspension is more practical.With good controllability, wide range of dynamic and the high speed of response, piezoelectric rain bender, as a kind of actuator, becomes the hot spot of the domain of the present intelligent controlling research, and also receives the favour of the whole world automobile manufacturers.Employing theory analysis and simulation, this dissertation discuss the feasibility of suspension damping device with piezoelectric rain bender and studies the dynamics characteristic, the control strategy and the designing of control system of this suspension damping device. The concrete work includes the following several respect:Elaborates the vital significance of intelligent suspension research, studies the development and the t necessity and the possibility of the electrical controlling automobile suspension, especially the semi-active suspension.Based on the characteristic of piezoelectricity material, the structure design of the rainbow bender, and the distortion of it has been studied, followed by an idea of new damper.The relation between the area of the valve and the discharge coefficient has been analyzed, and the mathematical model of the suspension damper is established by using hydromechanics theory and other correlated knowledge Produced the state equations of semi-active suspension and passive one based on this model. Establishes the fuzzy control method based on the mathematical four degrees of...