| 摘要 |
PURPOSE:To improve combustibility during low speed operation and output performance of a multi-cylinder engine provided with a single fuel injection valve, by reducing fuel supply, at the time of low-speed operation in particular, and lengthening the valve opening time. CONSTITUTION:An air flowmeter 3, a throttle valve 4 and a fuel injection valve 1 are arranged in the intake system, and an O2 sensor 21 and a ternary catalyst 31 are provided in the exhust system. Fuel is introduced into the fuel injection valve 1 through a tank 11, a pump 12, a damper 13 and a strainer 14. A device 16 for adjusting valve of returning fuel by an solenoid valve 18, which is opened and closed by negative pressure of an intake pipe, is connected to a transfer pipe 15. A control device 39, which receives signals from a throttle valve switch 5, a suction negative pressure sensor 5, an O2 sensor 21, a water temperature sensors 33 and 38, adjusts volume of fuel injected from the injection valve 1, so as to reduce volume of injected fuel and to increase length of valve-opening time during idling. |
