Abstract
This paper presents a new cruise control system to which a fuzzy control technology has been applied, including its development aims and its structure and effects. Although cruise control systems with an overdrive control function have been popular to improve cruise control performance on gradients since vehicles with 4-speed overdrive automatic transmissions were introduced into the market, their performance has not been completely satisfactory. To make the most effective use of the cruise control system, a fuzzy logic has been adopted for the first time at Mazda, and the system, which will be equipped in the new production carline SENTIA, has proved succesful.