Active suspension system

Details Active suspension system Active suspension system

1991-04-26

1992-08-11

Skaggs, H. Grant

Land vehicles

Wheeled

Running gear

36442405, B60G 1126

Patent

active

051372991

ABSTRACT:
An active suspension system for a vehicle having a sprung mass and an unsprung mass comprises a hydraulic actuator connected between the sprung mass and the unsprung mass, and a hydraulic accumulator. An energy saving valve communicates the accumulator with the actuator to effect energy saving flows of hydraulic fluid in the actuator. The system provides a nominal hydraulic fluid pressure differential acting across a piston in the actuator when the actuator is in a nominal operating condition. The system responds to static load inputs to the vehicle by providing a load responsive pressure differential across the piston when the actuator is in a loaded condition. The load responsive pressure differential acts on the piston equally and oppositely to the static load input. The system maintains the hydraulic fluid pressure in the first hydraulic chamber equal to a nominal pressure level when the actuator is in a loaded condition. The nominal pressure level is equal to the mean operating pressure of the accumulator. The system thus maintains an optimum capacity for energy savings.

REFERENCES:
patent: 3516683 (1970-06-01), Capgras
patent: 3550993 (1970-12-01), Peiffer
patent: 4483409, Fun
patent: 4625993 (1986-12-01), Williams et al.
patent: 4685698 (1987-08-01), Klinkner et al.
patent: 4743046 (1988-05-01), Schmittger
patent: 4787649 (1988-11-01), Watanabe et al.
patent: 4825370 (1989-04-01), Kurosawa
patent: 4999777 (1991-03-01), Schussler et al.
patent: 5015009 (1991-05-01), Ohyama et al.

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