CONTROL DEVICE FOR AUTOMATIC TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To realize a stable an in-neutral control with no excess response of a hydraulic servo device for engagement/disengagement-controlling a clutch even if the revolution number Ne at an input side of a torque convertor is varied. SOLUTION: In the in-neutral control, the clutch engaged when a traveling range is selected is engaged/disengaged by an output oil pressure of the hydraulic servo device and the output oil pressure of the hydraulic servo device is maintained to an in-neutral oil pressure in which the clutch slightly transmits a torque when the stopping state is detected in the state that the traveling range is selected. A calorific power per constant time of the clutch is determined based on the revolution numbers at the input side and the output side of the fluid transmission device and the in-neutral oil pressure is changed corresponding to the calorific power of the clutch.