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Speed control system for a motor vehicle

  • US 4,706,195 A
  • Filed: 06/12/1985
  • Issued: 11/10/1987
  • Est. Priority Date: 06/15/1984
  • Status: Expired due to Term
First Claim
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1. A speed control system for a motor vehicle comprising:

  • means for determining a velocity of said motor vehicle;

    running control means for automatically controlling running equipment of said motor vehicle to maintain said velocity of said motor vehicle at a desired velocity;

    means for determining a proper distance apart from any preceding vehicle in response to said velocity of said motor vehicle, and for determining a proximate distance, shorter than said proper distance;

    means for detecting if a preceding vehicle is present and measuring a distance apart from the preceding vehicle if one is detected;

    means for detecting at a certain time interval, a proximity with respect to the preceding vehicle by a change in said measured distance, said measured distance decreasing greater than a predetermined rate to indicate said proximity; and

    distance control means for maintaining said proper distance apart from the preceding vehicle by;

    (1) when said meaured distance is above said proper distance, and said proximity to the preceding vehicle is continuously detected for a plurality of time intervals, temporarily reducing said desired velocity to a reduced desired velocity and increasing the desired velocity after a time of no such proximity being detected, (2) when the measured distance is between the proper distance and the proximate distance, maintaining the desired velocity constant with no change at its present value, and (3) when the measured distance is below the proximate distance, rapidly decelerating the vehicle.

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