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Road condition discriminating system

  • US 4,651,290 A
  • Filed: 06/11/1984
  • Issued: 03/17/1987
  • Est. Priority Date: 06/16/1983
  • Status: Expired due to Term
First Claim
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1. A rough road discriminating system for a vehicle having a wheel system comprising:

  • vehicle speed sensor means, adapted to be mounted on a part of said wheel system of said vehicle, for generating a vehicle speed signal in response to revolutions of a wheel thereof;

    processing means for performing the following functions;

    (a) computing a value of wheel acceleration/deceleration as a rate of change of wheel speed representing a differentiated value of wheel speed, based on said vehicle speed signal, (b) generating a change degree signal by computing an amount of change in a magnitude of said wheel acceleration/deceleration during a predetermined period of time, and (c) comparing said change degree signal with a set value and generating a rough road decision signal indicating that said vehicle is running on a rough road when said change degree signal exceeds said set value; and

    actuating means for controlling actuating means of said vehicle in accordance with the rough road decision signal from said processing means.

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