| 摘要 |
PURPOSE:To easily form constitution of a circuit, by flowing an electric current in a solenoid coil of an injection valve at valve opening time and holding period in accordance with a number of injection cylinders, setting voltage corresponding to said electric current and controlling the solenoid coil in accordance with a compared result between the setting voltage and actual voltage. CONSTITUTION:A distributor signal, for distributing an injection pulse to solenoid coils L1-L4 of an injection valve through AND gates G1-G4 and switching elements Q1-Q4, is generated by a distributor signal generator circuit 1, and a valve opening reference voltage generator circuit 2 and holding reference voltage generator circuit 3 of both similar constitution are connected to the distributor signal generator circuit 1. Then a driving pulse generator circuit 4 is connected to output ends of these generator circuits 2, 3. This circuit 4 is constituted such that a driving pulse is generated until voltage, in accordance with an electric current flowing in each coil L1-L4 at generation of an injection pulse, becomes larger than valve opening reference voltage, and then the driving pulse is interruptedly generated to equalize the voltage of the above described coils L1-L4 to the holding reference voltage until the injection pulse disappears. |
