Patent ID: 8489296
Filing Date: 2013-07-16
Classification: F16H,Y10T

Abstract:
1. A controller for an automatic transmission having a solenoid valve that controls a hydraulic pressure of a transmission unit, the controller for automatic transmission comprising: slippage determination means for determining slippage of a drive force transmission element of the transmission unit; input torque calculation means for calculating input torque of the automatic transmission; normalcy determination means for determining normalcy of the solenoid valve based on the input torque calculated by the input torque calculation means during the slippage of the drive force transmission element; abnormalcy determination means for determining abnormalcy during the slippage of the drive force transmission element; and input torque extraction means for extracting the input torque during the slippage of the drive force transmission element, wherein after the abnormalcy determination is made, when no slippage of the drive force transmission element is determined, and a greater torque than the input torque during the slippage of the drive force transmission element is input to the automatic transmission, the normalcy determination means determines that the solenoid valve is in a normal state.