Importance

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Abstract

An actively controlled suspension system includes a hydraulic circuit connecting a pressure source unit to a pressure control valve unit which controls working fluid pressure in a working chamber of a hydraulic cylinder serving as principle component of a suspension system for supporting a vehicle body on a suspension member. The hydraulic circuit includes a supply line for supplying a pressurized fluid to the pressure control valve and a drain line for draining the pressurized fluid from the pressure control valve. A one-way check valve is disposed between the pressure source and the pressure control valve for presenting surge flow of the working fluid from the pressure control valve unit to the pressure source. An operational one-way check valve is disposed in the drain line for preventing surge flow from the pressure source to the pressure control valve unit. The operational one-way check valve is connected to the supply line downstream of the one-way check valve as a pilot pressure so as to permit fluid flow from the pressure control valve unit to the pressure source unit when the working fluid pressure in the drain line is higher than the pilot pressure.

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First Claim