Lock-up clutch control system of vehicle automatic transmission

Details Lock-up clutch control system of vehicle automatic transmission Lock-up clutch control system of vehicle automatic transmission

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 61/14 (2006.01) F16H 61/00 (2006.01)

Patent

CA 2077424

A system for controlling a lock-up clutch of a torque converter in which a target speed ratio of the torque con- verter is determined by carrying out a fuzzy reasoning based on fuzzy production rules using a degree of throttle open- ing, a grade resistance and a current speed ratio as parame- ters. Then a second fuzzy reasoning is carried out based on second fuzzy production rules using a deviation between the target speed ratio and the current speed ratio and the change of the deviation as parameters to determine a control value such that the lock-up clutch is controlled between a position at which the clutch is fully engaged and a position at which the clutch is fully not engaged including an in- termediate position at which the clutch is partially en- gaged. With the arrangement, the lock-up control can cope with various vehicle operating conditions so that the driva- bility and fuel consumption is improved while suppressing engine noise. The arrangement further enables the control that is better matched to the intention, descision-making, and feelings of a human driver.

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