Land vehicles – Wheeled – Running gear
Patent
1990-03-30
1991-09-03
Marmor, Charles A.
Land vehicles
Wheeled
Running gear
280714, B60G 1700
Patent
active
050446622
ABSTRACT:
An active suspension system includes a pressure holding mechanism with a pressure holding valve means which is maintained in conductive state for a given period in which the fluid pressure in a working chamber is gradually adjusted toward a predetermined neutral pressure level after turning OFF of a power switch. The pressure holding valve is, on the other hand, maintained in non-conductive state for a given period until the fluid pressure is adjusted to the neutral pressure after turning ON of the power switch. The system further includes a detector for detecting resumption of power supply after a short period of turning OFF of the power supply. A control system is responsive to the detector for detecting the resumption of power supply after power OFF state for a period shorter than the given period for performing short period resumption mode control operation by maintaining the pressure holding valve at the conductive state and setting the instantaneous fluid pressure in the working chamber as an initial pressure level.
REFERENCES:
patent: 4747615 (1988-05-01), Yamamoto
patent: 4765649 (1988-08-01), Ikemoto et al.
patent: 4829436 (1989-05-01), Kowalik et al.
Finlay Tamara L.
Marmor Charles A.
Nissan Motor Company Limited
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