Patent ID: 8374756

Claim:
A control device for an automatic transmission, comprising: a speed change controller configured to generate a speed change instruction; a temperature calculator configured to calculate a temperature of at least one frictional engagement element among frictional engagement elements which are selectively engaged to control the automatic transmission; a rotation difference calculator configured to calculate a rotation difference between an input and an output of the at least one frictional engagement element; a determining unit configured to determine whether the at least one frictional engagement element is engageable or non-engageable based on the temperature and the rotation difference of the at least one frictional engagement element and a pattern of the speed change instruction; and a delay unit configured to delay engagement until the determining unit determines that the at least one frictional engagement element is engageable, if the determining unit determines that the at least one frictional engagement element is non-engageable when the speed change controller generates the speed change instruction, wherein at least one of the speed change controller, the temperature calculator, the rotation difference calculator, the determining unit, and the delay unit is a component of an electronic control unit.