System and method for automatically controlling a vehicle speed

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180179, 123352, B60K 3100

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active

049582887

ABSTRACT:
A system for automatically controlling a vehicle speed to a desired cruising speed and method therefor are disclosed in which a controlled variable for an actuator for actuating a vehicular engine output to run the vehicle at the desired cruising speed is set using input and output membership functions for deriving an optimum operating variable of the actuator in a fuzzy estimation on the basis of input information on vehicle speed and a target cruising speed, the membership functions being stored in a memory and being correctable on the basis of the input information on the vehicle speed, change rates (control deviation, first-order difference, and second-order difference) of the vehicle speed, and set controlled variable, so that the vehicle speed conincides with the target cruising speed without reduction of control accuracy and without occurrence of overshooting of the controlled variable.

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patent: 4829437 (1989-05-01), Suzuki et al.
patent: 4835696 (1989-05-01), Suzuki et al.
IEEE Spectrum, Aug. 1984 cover page and pp. 26-32.

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