Working fluid circuit with line pressure control for vehicle act

Details Working fluid circuit with line pressure control for vehicle act Working fluid circuit with line pressure control for vehicle act

1991-02-21

1992-11-03

Mitchell, David M.

Land vehicles

Wheeled

Running gear

280714, 36442405, B60G 1126

Patent

active

051601613

ABSTRACT:
An active suspension system for an automotive vehicle is provided. This suspension system includes generally a hydraulic circuit which supplies pressurized fluid to hydraulic cylinders for controlling vehicle height and attitude. The hydraulic circuit includes a line pressure holding unit and a line pressure control unit. The line pressure holding unit is operable to hold the line pressure when the line pressure is lowered below a preselected pressure level after stopping supply of the pressurized fluid to the hydraulic cylinders. The line pressure control unit restricts a flow rate of the pressurized fluid to the hydraulic cylinders to build up the line pressure gradually until the line pressure reaches the preselected pressure level after starting the supply of pressurized fluid to the hydraulic cylinders to allow smooth adjustment of vehicle height and attitude.

REFERENCES:
patent: 4865348 (1989-09-01), Hano et al.
patent: 4967360 (1990-10-01), Fukunaga et al.
patent: 4973080 (1990-11-01), Ikemoto et al.
patent: 5044661 (1991-09-01), Kawabata
patent: 5044662 (1991-09-01), Kawabata

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