POWER TRAIN CONTROL DEVICE

PROBLEM TO BE SOLVED: To improve change gear ratio control of a power train provided with continuously variable transmission mechanism, to appropriate control corresponding to the situation. SOLUTION: A control unit 300 is provided to reduce a control gain in change gear ratio feedback control respectively when input torque to a power train is large, when a change gear ratio of the power train is large, when a travel mode is a Low mode and when a range is a reverse range. When torque is large, the physical deformation of a constituent member of continuously variable transmission mechanism is notable, and change gear ratio control is therefore difficult. In such a case, control stability is attained by reducing the control gain. Further when the change gear ratio is large and the fluctuation of the change gear ratio is notable, when the travel mode is low mode and the fluctuaiton of the change gear ratio is notable, or when the range is a reverse range and smooth control is demanded, stable control can be performed.