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Active suspension system with enhanced system start-up activity

  • US 5,105,358 A
  • Filed: 04/20/1990
  • Issued: 04/14/1992
  • Est. Priority Date: 04/20/1989
  • Status: Expired due to Term
First Claim
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1. An actively controlled suspension system comprising:

  • a hydraulic cylinder disposed between a vehicle body and a suspension member rotatably supporting a vehicular wheel, said hydraulic cylinder defining therein a working chamber;

    pressure source means including pump means associated with an automotive internal combustion engine to be driven by an output of said engine;

    pressure control valve means having a first port connected to said working chamber, a second port connected to said pressure source means via a supply line and a third port connected to said pressure source means via a drain line, said pressure control valve means being variable of valve position for selectively establishing and blocking fluid communication between said first port and said second port and between said first port and said third port for adjusting fluid pressure in said working chamber for controlling suspension characteristics;

    a vertical acceleration sensor for monitoring vertical acceleration exerted on the vehicle body to produce a vertical acceleration indicative signal;

    first means for arithmetically deriving a vertical stroke speed of said vehicle body on the basis of said vertical acceleration indicative signal; and

    second means for detecting initiation of arithmetic operation of said first means for setting data for use in derivation of said vertical stroke speed to a value for cancelling an offset contained in said vertical acceleration indicative signal.

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