新型汽车电流变液体减振器控制系统研究

介绍了电流变阀外置的新型汽车减振器的工作原理,描述了电流变液体减振器阻尼力与电场之间的相互关系。对两自由度电流变液体减振器半主动悬架的动力学模型进行了研究,提出了适合本系统的控制算法,设计了一种简单实用的位移测量以及相对速度测量电路,完成了电流变液体减振器控制系统的设计。所设计的新型电流变液体减振器具有阻尼力变化大、响应快、控制容易、结构简单等特点,满足了汽车工程的实际需要,具有重大的实用价值。

Study of a Digital Control System of the New Automotive ERF Shock Absorber

The working principles of a new electro-rheological shock absorber are introduced. The relationship between the electric field and resistance force of the electro-rheological fluid (ERF) is described. According to the practical driving conditions, a quarter-car model of two-degree-freedom is constructed. The control algorithm of this model is based on relative displacement and relative velocity. A high voltage supply unit for controlling the voltage of the ERF shock absorber is designed. The tire dynamic load variation is tracked with a rectilinear potentiometer fitted across the spring representing the tire. Similarly, a second identical potentiometer is fitted between the sprung and un-sprung mass to monitor the relative displacement between them, and an operation amplifier differentiator is then used to produce a signal representative of their relative velocity. These relative displacement and relative velocity signals are then input to a computer via a data acquisition unit for controlling the ERF shock absorber. This ERF controller has features of fast response, easy control and simple structures.