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Apparatus for controlling damping coefficient of vehicular shock absorber

  • US 5,398,184 A
  • Filed: 10/29/1992
  • Issued: 03/14/1995
  • Est. Priority Date: 11/01/1991
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising:

  • a) a plurality of shock absorbers, each of said shock absorbers being interposed between a portion of a vehicle body and corresponding road wheel and each having a piston member defining a fluid upper chamber and a fluid lower chamber and damping coefficient varying means associated with the piston member, said damping coefficient varying means operatively varying the damping coefficient in either stroke direction of the piston member to a target damping coefficient;

    a plurality of acceleration sensors, each associated with a shock absorber, each disposed on said vehicle body at a location proximate the associated shock absorber, and each arranged to produce an output signal indicative of a vertical acceleration;

    circuit means operatively connected with each of said plurality of acceleration sensors for receiving said output signals from said acceleration sensors, said circuit means including;

    sprung mass speed detecting means for filtering a sprung mass speed signal from each of said output signals;

    pitching rate detecting means for filtering a pitching rate component of the vehicle body from each of said sprung mass speed signals;

    rolling rate detecting means for filtering a rolling rate component of the vehicle body from each of said sprung mass speed signals; and

    controlling means for deriving a control signal for each of said damping coefficient varying means on the basis of at least one of the sprung mass speed signals, pitching rate components, and rolling rate components and outputting said control signal to the respective damping coefficient varying means of the corresponding shock absorbers.

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