Patent ID: 7220216
Filing Date: 2007-05-22
Classification: F16H,Y10T

Abstract:
1. A lock-up clutch control device for controlling a lock-up clutch mechanism provided to a torque converter comprising: an estimation means for estimating a contact timing of a friction material included in the lock-up clutch mechanism during a driven state based on an engine rotational speed change when condition of the lock-up clutch mechanism is changed from a disengaging state to an engaging state; and a precharge control means for executing a precharge control of supplying hydraulic pressure for controlling movement of a lock-up piston by outputting a precharge wave form including a first period wave form set to the vicinity of a maximum value and a second period wave form set to a smaller value than the value of the first period wave form and a learning control means for controlling the precharge wave form based on a contacting shock of the friction material calculated from the engine rotational speed change, where the second period wave form of the precharge wave form is kept at a constant value.