Hydraulic active suspension system for a vehicle for controlling the attitude of vehicle body responding to lateral acceleration

A hydraulic active suspension system for a vehicle having a vehicle body and vehicle wheels comprising:

• a plurality of actuators each being provided between said vehicle body and said associated vehicle wheel for increasing and decreasing vehicle height in response to the pressure within its working fluid chamber;
• a means for controlling the pressures within said working fluid chambers;
• a means for detecting vehicle speed;
• a means for detecting a lateral acceleration of said vehicle body;
• and
• a control means for controlling said pressure control means by a compensating value determined based upon the lateral acceleration detected by said lateral acceleration detecting means;
• wherein said control means calculates said compensating value as the sum of a first component proportional to a parameter which increases in magnitude along with an increase of the lateral acceleration and a second component proportional to the differentiation by time of said parameter and reduces a proportioning coefficient in said second component when said vehicle speed is lower than a predetermined value.