Automatic vehicle speed controlling apparatus
First Claim
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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Accused Products
Abstract
An automatic vehicle speed controlling apparatus for a vehicle includes a vehicle speed sensor for sensing the actual speed of the vehicle and providing actual speed data proportional to the actual speed of the vehicle, a command switch operable for generating a cruise command signal and an actuator for driving a throttle valve with the vehicle. The control unit is responsive to the actual speed data and the cruise command signal and includes storage memory for storing a desired speed datum in response to the cruise command signal. The control unit selectively generates a speed increasing signal and a speed decreasing signal in response to a difference between the actual speed data and the desired speed datum stored in the memory and supplying the speed increasing signal and the speed decreasing signal to the actuator. The control unit continues generating the speed increasing signal and successively generates the speed decreasing signal when the difference between the actual speed data and the desired speed datum reaches a first predetermined value while the vehicle is accelerated with the speed increasing signal. The control unit further detects the acceleration value of the vehicle derived from the change rate of the actual speed data supplied from the vehicle speed sensor and generates the speed decreasing signal when the difference between the actual speed data and the desired speed datum reaches a second predetermined value greater than the first predetermined value after the acceleration of the vehicle exceeds a predetermined acceleration value.
43 Citations
3 Claims
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1. An automatic vehicle speed controlling apparatus for a vehicle comprising:
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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. - View Dependent Claims (2, 3)
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Specification