Actively controlled automotive suspension system with mutually independent hydraulic systems having mutually different damping characteristics for improving response characteristics in active suspension control

摘要

An actively controlled suspension system has two hydraulic systems for generating damping force against the vibration to be transmitted between a vehicle body and a suspension member (13). One of the hydraulic systems is designed for absorbing relatively high frequency vibration generally input from the suspension member for preventing vibration from the suspension member t=from being transmitted to the vehicle body. The other hydraulic system is active on relatively low frequency of vibration generally input from the vehicle body upon change of attitude of the vehicle body. The other hydraulic system generates a fluid pressure suppressing the attitude change. A pressure control valve (18) and a fluid pressure source (20) may be incorporated in the second hydraulic system so that they may not be active when aforementioned one of the hydraulic system is active.