| 摘要 |
PURPOSE:To stabilize the valve opening ability of a fuel injection valve, by providing a mono-stable circuit which receives an injection pulse and is triggered at the leading edge of the pulse to issue a control pulse for controlling a period during which a large capacity current for the initial stage of the valve opening is fed. CONSTITUTION:Injection pulses are delivered to an inverter 1 and an IHOLD reference voltage generating circuit 2. A mono-stable circuit 3 is connected to an IMAX reference voltage generating circuit 4. Comparators 5, 6 are connected to an OR circuit 11 which is in turn connected to a power transistor 7. The solenoid coil of an electro-magnetic type fuel injection valve 12 is connected to the power transistor 7. The mono-stable circuit 3 is triggered at the leading edge of an injection pulse to generate a pulse for controlling a period during which a large capacity of current is fed for the initial stage of the valve opening. With this arrangement, the valve opening ability of the fuel injection valve may be made stable. |
