Actively controlled automotive suspension system with line press

Details Actively controlled automotive suspension system with line press Actively controlled automotive suspension system with line press

1988-03-04

1989-09-12

Bertsch, Richard A.

Land vehicles

Wheeled

Running gear

280 612, B60G 1700

Patent

active

048653489

ABSTRACT:
An actively controlled suspension system employs a shut-off valve which is responsive to a source pressure dropping below a predetermined level to shut-off communication between a pressure return line for returning the fluid pressure to the pressure source from a hydraulic cylinder. The shut-off valve is disposed in a drain line connecting a drain port of a spool valve assembly and the pressure source. By the presence of the shut-off valve, substantial pressure difference between the hydraulic cylinder side and pressure source side of the spool valve is not created. Therefore, no leakage through the spool valve occurs and whereby the pressure in the hydraulic cylinder can be maintained even when the source pressure becomes substantially low or zero.

REFERENCES:
patent: 4350354 (1982-09-01), Dotti et al.
patent: 4697822 (1987-10-01), Blanz
patent: 4702490 (1987-10-01), Yamaguchi et al.

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