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Suspension control system having damping coefficient discretely varied responsive to road conditions

  • US 5,361,209 A
  • Filed: 01/22/1993
  • Issued: 11/01/1994
  • Est. Priority Date: 12/08/1989
  • Status: Expired due to Fees
First Claim
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1. A suspension control system for controlling a suspension having a shock absorber provided for a wheel of a vehicle, said suspension control system comprising:

  • damping force change rate detecting means for detecting a damping coefficient change rate indicating a rate of change of a damping force of said shock absorber;

    damping coefficient controlling means, coupled to said shock absorber and said damping force change rate detecting means, for setting a damping coefficient of said shock absorber to a first level from a second level less than the first level when the damping force change rate has exceeded an adjustment reference value;

    damping coefficient alteration holding means, coupled to said shock absorber and said damping coefficient controlling means, for continuously maintaining the setting of the damping coefficient at the first level for a holding period after said damping coefficient controlling means alters the setting of the damping coefficient from the second level to said first level, said holding period being a first period starting from a time when said adjustment reference value becomes greater than said damping force change rate after said damping coefficient controlling means alters the setting of the damping coefficient from the second level to the first level;

    road surface condition judgement means for judging whether or not a road surface on which said vehicle has traveled for said holding period is rough; and

    holding period correction means, coupled to said damping coefficient alteration holding means and said road surface condition judgement means, for elongating said holding period so that said holding period is a second period which is longer than said first period and which starts from said time when said adjustment reference value becomes greater than said damping force change rate after said damping coefficient controlling means alters the setting of the damping coefficient from the second level to the first level.

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