| 摘要 |
<P>PROBLEM TO BE SOLVED: To control an electric motor into a regenerative state in a high-vehicle-speed region in which the electric motor is decoupled from drive wheels. <P>SOLUTION: A clutch mechanism is provided between drive wheels and an electric motor. In a high-vehicle-speed region, the electric motor is decoupled from the drive wheels so as to prevent overspeed of the electric motor. In the high-vehicle-speed region in which the clutch mechanism is switched to a disengaged state in such a manner, when a state of charge SOC falls below a prescribed lower-limit value S<SB>min</SB>(symbol b), rotation speed control is executed to the electric motor so that the motor rotation speed is maintained at a target rotation speed Nt on a lower-rotation side than an upper-limit rotation speed N<SB>max</SB>. Further, the clutch mechanism is switched from the disengaged state to a slip state. By this, a limited power-generation torque is supplied to the electric motor. Therefore, it is possible to control the electric motor into a regenerative state while controlling the motor rotation speed at the upper-limit rotation speed N<SB>max</SB>or below. <P>COPYRIGHT: (C)2011,JPO&INPIT |
