| 摘要 |
PURPOSE:To enhance the control accuracy of fuel flow rate, by providing a flywheel control circuit means for turning off a flywheel circuit connected in parallel with a fuel injection valve, in a specific interval. CONSTITUTION:The coil 1 of an electromagnetic fuel injection valve is connected in series with a drive transistor 2 and is also connected in parallel with a flywheel transistor 3. First and second transistors 11, 15 turn off the flywheel transistor 3 in the interval during which the energized amount of the coil changes from a large capacity valve opening current value to a valve opening holding current value. With this arrangement the characteristics of fuel flow rate v.s. injection pulse energizing time may be linear to enhance the control accuracy of fuel flow rate. |
