Vehicle automatic transmission control system.

摘要

In a control system for controlling a gear ratio of a multi-step geared or continuously variable automatic transmission, the driver's intention to decelerate (DEC) is inferred by carrying out a first fuzzy reasoning (S12) using a degree of throttle opening or the like and then the target gear ratio is determined by carrying out a second fuzzy reasoning (S16) using parameters including the inferred driver's intention to decelerate. The first fuzzy reasoning (S12) is carried out using fuzzy production rules classified by operating conditions such as the road profile and the vehicle speed. The inferred driver's intention to decelerate (DEC) may be cancelled if braking is discontinued. Thus the control system ascertains the intention of the driver and it is thus possible to achieve sophisticated shift scheduling well matched to the sensibilities of the driver.