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System and method for automatically controlling a vehicle speed to a desired cruising speed

  • US 4,958,288 A
  • Filed: 06/30/1988
  • Issued: 09/18/1990
  • Est. Priority Date: 07/01/1987
  • Status: Expired due to Fees
First Claim
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1. A system for automatically controlling the speed of a vehicle at a target cruising speed, comprising:

  • (a) first means for monitoring the speed of the vehicle;

    (b) second means for setting the target cruising speed at which the vehicle cruises during a run of the vehicle according to a vehicle driver'"'"'s decision;

    (c) third means for controlling the vehicular engine output according to a controlled variable set for each predetermined interval of time, so that the monitored vehicle speed coincides with the target cruising speed set by the second means;

    (d) fourth means for storing a group of input/output membership functions for deriving the controlled variable in a fuzzy estimation, each stored membership function being correctable;

    (e) fifth means for setting the controlled variable in the third means, using one of the membership functions retrieved from the fourth means on the basis of the monitored vehicle speed and the target cruising speed; and

    (f) sixth means for deriving a change rate of the vehicle speed on the basis of the monitored vehicle speed and correcting any one or more of the membership functions stored in the fourth means and used for setting the controlled vehicle by the fifth means under a predetermined condition on the basis of the monitored vehicle speed and said set controlled variable.

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