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Method and system for controlling automotive suspension system, particularly for controlling suspension characteristics in accordance with road surface conditions

  • US 4,827,416 A
  • Filed: 09/12/1986
  • Issued: 05/02/1989
  • Est. Priority Date: 09/13/1985
  • Status: Expired due to Term
First Claim
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1. An automotive suspension control system comprising:

  • a suspension system suspending road wheels from a vehicle body and having suspension characteristics variable between a first harder suspension characteristics mode and a second softer suspension characteristics mode;

    an actuator selectively operating said suspension system in a selected one of said first harder suspension characteristics mode and said second softer suspension characteristics mode;

    a first sensor monitoring a preselected first suspension control parameter indicative of vehicle attitude and producing a first sensor signal, said suspension control parameter being selected from vehicular driving parameters causing vehicular attitude change;

    a second sensor monitoring the roughness of the road surface and producing a second sensor signal indicative of the road surface condition; and

    a controller deriving a control signal for operating said actuator to operate said suspension system in the selected one of said first harder suspension characteristics mode and said second softer suspension characteristics mode depending on said first sensor signal value and predetermined control characteristics which define a schedule of suspension characteristics mode selection in relation to said preselected suspension control parameter, said controller having a plurality of said predetermined control characteristics and selecting one of said control characteristics according to the value of said second sensor signal.

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