Patent ID: 6575484
Filing Date: 2003-06-10
Classification: B60G

Abstract:
A hydraulic circuit for controlling a suspension of a vehicle having a cylinder with a piston that defines a first chamber and a second chamber within the cylinder, said hydraulic circuit comprising:a first work port for connection to the second chamber of the cylinder; a second work port for connection to the first chamber of the cylinder; a first node connected to the first chamber; a first control valve with an inlet for connection to a pump supply line of the vehicle and a port coupled to the first node; a pressure relief valve which selectively connects one of the first work port and the second work port to a tank return line of the vehicle in response to pressure in the one of the first work port and the second work port exceeding a first threshold level which is varied by an electric signal; a proportional control valve selectively connecting the first work port to the second work port; a first accumulator coupled to the first work port; and a second accumulator coupled to the second work port.