| 摘要 |
PROBLEM TO BE SOLVED: To provide an injector drive device capable of protecting a switching element for cylinder selection.SOLUTION: A discharge transistor 8 supplies/cuts off boost voltage obtained by boosting a power source voltage VB to an electromagnetic coil 6 for solenoid valve drive. A cylinder selection transistor 10 is connected to the discharge transistor 8 and the electromagnetic coil 6 in series. The power source voltage VB is supplied to a cylinder selection control circuit 4d, and the cylinder selection control circuit 4d performs on-off control to the cylinder selection transistor 10. Here, a current control unit 34 performs on-off control to the discharge transistor 8 according to drain voltage of the cylinder selection transistor 10.SELECTED DRAWING: Figure 3 |
