| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent generation of a motor over-rotation and vehicle vibration when a clutch is disengaged for shift to 2WD (wheel drive), in a 4WD vehicle constructed so that a front wheel is driven by an engine, a rear wheel is driven by a motor through the clutch, and so that electric power is supplied directly to the motor from a generator driven by the engine. <P>SOLUTION: If vehicle speed is higher than a threshold X, a shift from 4WD to 2WD performing driving by only the engine is determined. Disengagement of the clutch is controlled, and power generation of the generator is stopped to disconnect the rotor current (armature current) Ia of the motor. Even if a magnetic field current If (field current) of the motor is then forcibly shut down and a rotor current Ia (armature current) is supplied to the motor, the motor is prevented from causing over-rotation. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
