| 摘要 |
PROBLEM TO BE SOLVED: To narrow the operation region of an electric oil pump while avoiding control hunting.SOLUTION: A hydraulic oil supply device includes a mechanical oil pump which is rotatively driven in linkage with a vehicle speed and the electric oil pump which is rotatively driven with energization control. Since a rotor speed MN of the mechanical oil pump is reduced in a low vehicle speed region, when the rotor speed MN falls below an operation threshold value EPon, the electric oil pump is driven, and when the rotor speed MN exceeds a stop threshold value EPoff, the electric oil pump is stopped. Between the operation threshold value EPon and the stop threshold value EPoff, a hysteresis width hys is provided for preventing the control hunting of the electric oil pump. When a vehicle acceleration is great, the hysteresis width hys also gets great, and when the vehicle acceleration is small, the hysteresis width hys also gets small. Thus, in a travel condition where disturbance easily occurs, the control hunting of the electric oil pump is inhibited, and in a travelling condition where the disturbance hardly occurs, the operation of the electric oil pump is inhibited. |
