Land vehicles – Wheeled – Running gear
Patent
1991-04-26
1992-05-05
Skaggs, H. Grant
Land vehicles
Wheeled
Running gear
36442405, B60G 1126
Patent
active
051101521
ABSTRACT:
A suspension control 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 circuit communicating the actuator with a pump and a reservoir. The hydraulic circuit includes an on-off valve assembly which controls the actuator. The system further comprises sensors for sensing inputs to the vehicle, and a controller for providing a demand signal in response to the sensed inputs. The demand signal indicates a desired motion or resistance to motion of the piston in the actuator to achieve a desired motion or resistance to motion of the sprung mass relative to the unsprung mass. A pulse width modulating circuit provides a PWM control signal for operating the on-off valve assembly in response to the demand signal. The PWM control signal has a duty cycle which is a function of the demand signal.
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Skaggs H. Grant
TRW Inc.
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