Land vehicles – Wheeled – Running gear
Patent
1990-08-30
1991-09-03
Rice, Kenneth R.
Land vehicles
Wheeled
Running gear
3644241, B60G 1708
Patent
active
050446614
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. A control means is provided for performing suspension control operation in response to various suspension control parameters for adjusting fluid pressure in a working chamber of a cylinder for regulating vehicular height and vehicular attitude. The control means being responsive to switching of the pressure holding valve from non-conductive state to conductive state for permitting pressure supply therethrough for maintaining a suspension control command value at a predetermined value essentially corresponding to a neutral pressure for a predetermined transition period so as to assure moderate increase of the fluid pressure.
REFERENCES:
patent: 4702490 (1987-10-01), Yamaguchi et al.
patent: 4919440 (1990-04-01), Tsukamoto
Nissan Motor Company Limited
Rice Kenneth R.
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