Patent ID: 9031752
Filing Date: 2015-05-12
Classification: F16D,F16H,Y10T

Abstract:
1. A device for controlling an automatic transmission, comprising: a torque converter disposed between a drive source of a vehicle and the automatic transmission; a lock-up clutch disposed to enable a side of the drive source of the torque converter and a side of the automatic transmission to engage with each other; a lock-up clutch control means for executing feedback control to conform an actual slip amount of the lock-up clutch with a target slip amount; and a zero slip control means for bringing the lock-up clutch into a zero slip state immediately before slippage occurs in accordance with a zero slip request outputted during a non-gear shift, wherein in a case where the target slip amount is equal to or smaller than a slip amount threshold value upon transition to the zero slip state, the zero slip control means executes zero slip control to fix the target slip amount to the slip amount threshold value and retain the fixed target slip amount for a predetermined period of time, and after the predetermined period of time has elapsed, gradually decrease the target slip amount from the slip amount threshold value to a zero slip amount with time.