Patent ID: 8886435
Filing Date: 2014-11-11
Classification: F16H

Abstract:
1. A lock-up device, comprising: a lock-up clutch capable of coupling and decoupling an input member connected to a drive source of a vehicle and an input shaft of a speed change device to and from each other; a hydraulic unit that supplies a hydraulic pressure to the lock-up clutch; and a slip control unit that controls the hydraulic unit such that a difference in rotational speed between the input member and the input shaft of the speed change device becomes a target slip speed corresponding to a state of the vehicle through half engagement of the lock-up clutch, wherein the slip control unit includes: a drive source torque acquisition unit that acquires drive source torque, which is an estimated value of output torque of the drive source, from a drive source control unit that controls the drive source, the drive source control unit being separate from the slip control unit; an accelerator operation amount variation amount acquisition unit that acquires an accelerator operation amount variation amount which is an amount of variation in accelerator operation amount per unit time; and a hydraulic pressure command value setting unit that sets a hydraulic pressure command value for the hydraulic unit corresponding to the drive source torque such that the difference in rotational speed becomes the target slip speed in the case where the accelerator operation amount variation amount is in a predefined range, and that derives predicted drive source torque, which is an estimated value of output torque of the drive source, corresponding to the accelerator operation amount to set the hydraulic pressure command value corresponding to the predicted drive source torque such that the difference in rotational speed becomes the target slip speed in the case where the accelerator operation amount variation amount becomes more than an upper limit of the range because of an increase in accelerator operation amount, wherein the hydraulic pressure command value setting unit derives the predicted drive source torque corresponding to the accelerator operation amount to set the hydraulic pressure command value corresponding to the predicted drive source torque such that the difference in rotational speed becomes the target slip speed in the case where the accelerator operation amount variation amount becomes less than a lower limit of the range because of a decrease in accelerator operation amount.