| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of a tight corner braking phenomenon in a four-wheel drive vehicle by improving engagement responsiveness in an electromagnetic two-way clutch. SOLUTION: Electric current is flowed back by a diode D only in order to make small the damping of the electric current of a coil 22 at an off-time of a switching element SW1 when maintaining regular engagement such as a four-wheel drive mode. When the responsiveness of the electromagnetic two-way clutch is important such as an auto-mode, a load such as a resistor R is attached to the end of the coil 22 in order to improve the responsiveness of the electromagnetic clutch at an off-time of engagement. Thus, a circuit, which can enlarge the damping of coil current at an off-time of the switching element by consuming the coil current with the connected resistor, is formed. COPYRIGHT: (C)2004,JPO
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