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Automatic speed control system

  • US 5,154,250 A
  • Filed: 09/27/1991
  • Issued: 10/13/1992
  • Est. Priority Date: 09/28/1990
  • Status: Expired due to Fees
First Claim
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1. A constant-speed cruise control system for a vehicle comprising:

  • means for detecting an actual speed of a vehicle,means, manually operated by a driver, for setting a target speed for the vehicle,means for controlling the actual speed of the vehicle so that is approaches the target speed by adjusting an engine output,down-shift means for making a down-shift operation of a transmission so as to accomplish the target speed under a predetermined condition when the vehicle runs on an uphill road,detecting means for detecting a maximum value of the engine output after the down-shift operation is made,difference detecting means for detecting a difference between said maximum value and a present value of the engine output, anduphill end judge means for judging that an end of the uphill road has been reached by the vehicle when said difference exceeds a first predetermined value.

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