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Automotive suspension control system with vehicle speed-dependent damping characteristics

  • US 4,616,848 A
  • Filed: 09/03/1985
  • Issued: 10/14/1986
  • Est. Priority Date: 09/06/1984
  • Status: Expired due to Fees
First Claim
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1. A suspension control system for an automotive vehicle comprising:

  • a damper means interpositioned between a vehicle body and a road wheel for absorbing, at least in part, relative displacement between the vehicle body and the road wheel, said damper means having variable damper characteristics;

    a first sensor detecting roughness of the road surface and producing a first sensor signal having a value variable depending upon roughness of the road surface;

    a second sensor detecting vehicle speed and producing a second signal having a value variable depending upon vehicle speed; and

    a controller associated with said damper means for normally operating the latter in said first softer damping characteristics mode, said contrller being responsive to said second sensor signal for detecting the second sensor signal value within a given range representing a specific vehicle speed range, which given range being defined by an upper reference value representative of an upper vehicle speed criteria and a lower reference value representative of a lower vehicle speed criteria, comparing said second sensor signal value with said upper and lower reference values to determine whether the vehicle speed is within said given range or not, and varying variation characteristics of variable damping characteristics of said damper means in such a manner that, when said second sensor signal value is out of said given range, said controller derives sensing ability of road roughness and/or hardening magnitude of said variable damping characteristics damping means at relatively higher level, and when said second sensor signal value is within said given range, said controller derives sensing ability of road roughness and/or hardening magnitude of said variable damping characteristics damping means at relatively lower level.

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