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System and method for automatically controlling cruising speed of vehicles

  • US 4,922,428 A
  • Filed: 12/09/1987
  • Issued: 05/01/1990
  • Est. Priority Date: 12/10/1986
  • Status: Expired due to Fees
First Claim
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1. A self-adapting universal system for automatically controlling a vehicle speed of a particular vehicle to a desired cruising speed, comprising:

  • (a) first means for optimizing control parameters K1 and K2 of an operating variable u for an engine driving force adjusting mechanism of the vehicle required for a vehicle speed to reach the desired cruising speed through a learning operation during vehicle operation to derive values of the control parameters K1 and K2 defining the operating variable u of the engine driving force adjusting mechanism using the optimized control parameters wherein the operating variable u is defined as u=K1 e+K2 Δ

    e, wherein K1 and K2 represent the control parameters, e represents a difference between a present vehicle speed and a target vehicle cruising speed, and Δ

    e represents a step difference between the control difference e and that of an e'"'"' of a prior control period (Δ

    e=e'"'"'-e);

    (b) second means for detecting an occurrence of a predetermined disturbance known to affect the engine driving force required to reach and maintain a predetermined vehicle speed; and

    (c) third means for inhibiting the learning of the control parameters K1 and K2 when the second means detects the occurrence of said predetermined disturbance.

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