Working fluid circuit for active suspension control system of vehicle

A working fluid circuit for an active suspension control system for a wheeled vehicle at least three wheels, comprising:

• a plurality of actuators cooperating with respective wheels of the vehicle for suppressing an attitude change of the vehicle body;
• a pressure source for providing a pressurized working fluid to said actuators;
• a plurality of pressure control valves for respectively controlling a pressure of the working fluid supplied by said pressure source to each of said actuators, each pressure control valve having a supply port and an output port;
• a plurality of supply lines connecting said pressure source and respective supply ports of said pressure control valves for supplying pressurized working fluid from said pressure source to corresponding pressure control valves, said supply lines being in fluid unrestricted communication with each other;
• a plurality of output lines connecting between respective output ports of said pressure control valves and corresponding actuators for adjusting the working fluid in each of said actuators at preselected controlled levels;
• and
• valve means comprising respective single check valves connecting each of said supply lines and said output lines, each of said single check valves being provided in parallel to a respective one of said pressure control valves, said single check valves each acting when a pressure of the working fluid in the output line connected to said respective pressure control valve exceeds a pressure in the supply line connected to said respective pressure control valve to feed back working fluid from the output line connected to said respective pressure control valve to the supply line connected to said respective pressure control valve to thereby supplement the supply pressure of the working fluid provided via said unrestrictedly communicating supply lines to all of said pressure control valves.