| 摘要 |
An improved system and method for automatically controlling a vehicle speed to a desired cruising speed are disclosed in which a vehicle speed is detected, a target vehicle cruising speed is set on the basis of a vehicle driver's intention, a driving characteristic of a vehicular system is derived, a membership function in a fuzzy estimation is set according to the derived driving characteristic, and the fuzzy estimation is carried out using the membership function to set a controlled variable of an actuator of an engine output, the actuator controlling the engine output using the set controlled variable, with the detected vehicle speed and set target cruising speed as input information. The driving characteristic includes an operating state of a vehicular transmission connected to the engine output in a first preferred embodiment. In a second preferred embodiment, the driving characteristic includes the target cruising speed and the vehicle speed at a time of start of a resume operation in which the vehicle speed is returned to the originally set cruising speed after a cancellation of operation of the automatic cruising speed controlling system.
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