半主动悬架可调阻尼减振器及其控制时滞研究

研制了一种用于汽车半主动悬架系统的可调阻尼减振器，试验结果显示该减振器的阻尼调节性能达到半主动悬架控制要求．提出了一种基于天棚阻尼控制原理的新方法，可根据汽车的实际行驶情况灵活地控制车身振动加速度和车轮动载，从而实现预期的控制目标．探讨了可调阻尼减振器的驱动机构动作时滞和阻尼切换时滞对半主动悬架系统控制效果的影响．结果显示：驱动机构在120ms以上的时滞对车身振动加速度和车轮动载荷均有不利影响；减振器阻尼系数切换时的变化速度过快或过慢都对控制效果不利，

Study on adjustable-damp shock absorber of semi-active supension and its control time delay

An adjustable-damping shock absorber for semi-active suspension is developed, and test results show that the anticipated control effect on damping adjusting is reached. A new control tactic based on sky-hook damper theory is put forward, which can neatly control body acceleration and dynamic load of tire according to the actual circumstance. Influence of time delay on drive parts of this shock absorber and damping switch on control effect of semi-active suspension is discussed. Results of simulation show that time delay more than 120 ms on drive parts has bad effect on body acceleration and tire dynamic load; if damp-switching velocity is too fast or too slow, the effect on control would become worse.