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Automatic vehicle speed controlling apparatus

  • US 5,749,063 A
  • Filed: 11/10/1993
  • Issued: 05/05/1998
  • Est. Priority Date: 11/11/1992
  • Status: Expired due to Fees
First Claim
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1. An automatic vehicle speed controlling apparatus for a vehicle comprising:

  • a vehicle speed sensor for sensing actual speed of the vehicle, and for generating actual speed data which is proportional to the actual speed of the vehicle;

    command switch means operable for generating a cruise command signal;

    activator means for driving a throttle valve of the vehicle;

    control means responsive to the actual speed data from said vehicle speed sensor and the cruise command signal from said command switch means, and including storage means for storing a desired speed datum in response to the cruise command signal from said command switch means, and means for selectively generating a speed increasing signal and a speed decreasing signal in response to a difference between the actual speed data from said vehicle speed sensor and the desired speed datum stored in said storage means and for supplying the speed increasing signal and the speed decreasing signal to said activator means;

    wherein said means for selectively generating the speed increasing and the speed decreasing signals discontinues generating of the speed increasing signal and successively generates the speed decreasing signal when the difference between the actual speed data from said vehicle speed sensor and the desired speed datum stored in said storage means reaches a first predetermined value while the vehicle is accelerated with the speed increasing signal; and

    wherein said control means further includes means for detecting the acceleration value of the vehicle derived from change rate of the actual speed data supplied from said vehicle speed sensor;

    the improvement comprising said control means generates the speed decreasing signal when the difference between the actual speed data supplied from said vehicle speed sensor and the desired speed datum stored in said storage means reaches a second predetermined value greater than the first predetermined value after the acceleration of the vehicle detected with said detecting means exceeds a predetermined acceleration value.

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