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Suspension system for a vehicle

  • US 5,269,557 A
  • Filed: 10/28/1991
  • Issued: 12/14/1993
  • Est. Priority Date: 10/26/1990
  • Status: Expired due to Fees
First Claim
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1. A suspension system for a vehicle comprising:

  • a shock absorber provided between a sprung member and an unsprung member for changing a damping force characteristic into four or more characteristics;

    oscillation frequency range detecting means for detecting an oscillation frequency range of the sprung member of the vehicle;

    road detecting means for detecting a road surface;

    damping force characteristic limiting means for limiting the damping force characteristics to less than four characteristics, and for receiving signals from the oscillation frequency range detecting means and the road detecting means so as to limit the damping force characteristics of the shock absorber to a higher level side of the less than four damping characteristics when the sprung member is in a low frequency oscillation range, to a lower level side of the less than four damping characteristics when the sprung member is in a high frequency oscillation range, and to a medium level side of the less than four damping characteristics when the road surface is uneven; and

    damping force characteristics changing and controlling means for changing and controlling the damping force characteristic of the shock absorber on the basis of a given control rule to a characteristic within the damping force characteristics limited by the damping force characteristic limiting means.

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