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Motor vehicle cruise control with selectively updated integral gain

  • US 6,278,931 B1
  • Filed: 04/04/2000
  • Issued: 08/21/2001
  • Est. Priority Date: 04/04/2000
  • Status: Expired due to Fees
First Claim
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1. A motor vehicle cruise control that determines a speed error according to a difference between desired and measured vehicle speeds, computes a control variable according to a sum of a first term proportional to the determined speed error and a second term proportional to an integral of the determined speed error, determines a power plant command based on the control variable for bringing the measured vehicle speed into correspondence with the desired vehicle speed, and adjusts a vehicle power plant setting in accordance with the power plant command, the improvement wherein:

  • the second term is selectively updated to reflect changes in the speed error, based upon a comparison of a magnitude of the speed error relative to a predefined threshold error that is greater than zero, such that;

    when the speed error magnitude falls below the threshold error, updating of the second term is discontinued and a then-current value of the second term is maintained; and

    when the speed error magnitude subsequently rises above the threshold error, updating of the second term is resumed.

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