US 4,072,206 A · Device for regulating vehicle road speed

Abstract

A motor vehicle speed control system which, upon activation by the vehicle operator, maintains the vehicle at a predetermined set speed. The system utilizes a duty-cycle type pneumatic servoactuator responsive to an electrical control signal for controlling movement of the vehicle throttle. Control means responsive to deviation of vehicle speed from the predetermined set speed, is operable to vary the control signal characteristics in accordance with a predetermined governing equation and the electrical control signal is utilized to operate the servoactuator. Vehicle speed is sensed by a generator providing an electrical signal output and a control means is of the electronic type responsive to the electrical speed signal and the predetermined set speed. In one embodiment both analog-digital circuit techniques are employed for the control means and, in another embodiment, substantially all-digital circuitry is utilized.

Claims10

Dependent claims

A device for maintaining a selected speed in a throttle controlled motor vehicle, said device comprising:

means for sensing the substantially instantaneous value of the actual vehicle speeds;
means for registering a selected value of said sensed vehicle speed to represent said selected speed;
means for producing a control signal, one characteristic of which is varied in accordance with the value of K.sub.1 + K.sub.2 V.sub.SET + K.sub.3 V.sub.G where K.sub.1, K.sub.2 and K.sub.3 are predetermined, non-zero constants with K.sub.2 different from K.sub.3, where V.sub.SET is said selected value, and V.sub.G is said substantially instantaneous value;
and
servoactuator means responsive to said varying characteristic to move said throttle for maintaining said selected speed.

2 more elements

Dependencies are inferred from the claim text.

Device for regulating vehicle road speed

Life of this patent

Device for regulating vehicle road speed

Life of this patent

Abstract

Claims10