Patent ID: 7066474

Claim:
A suspension or level control system for a vehicle comprising: left and right parallel pneumatic circuits, said left and right parallel pneumatic circuits parallel to each other and mounted to a chassis of the vehicle so as to extend to opposite sides of the vehicle, said circuits in fluid communication with a pressurized air source so as to independently control inflation and deflation of corresponding left and right air-springs of the vehicle, and wherein each said pneumatic circuit includes a selectively actuable height control valves for: a) selectively passing pressurized air from said air source into the corresponding said parallel pneumatic circuit to selectively inflate the corresponding said air-spring thereby raising a corresponding corner of said chassis; and, b) selectively venting pressurized air from the corresponding said parallel pneumatic circuit to selectively deflate the corresponding said air-spring, thereby lowering a corresponding corner of said chassis, at least one accelerometer on the vehicle providing acceleration data indicating tilt of the vehicle when the vehicle is static and dynamic acceleration including tilt when the vehicle is moving, and means for monitoring said acceleration data cooperating with said selectively actuable height control valves so as to selectively actuate said passing pressurized air or said venting pressurized air.