| 摘要 |
PURPOSE:To precisely compensate air fuel ratio in accordance with running conditions of an engine, by setting, down- and up-stream of a constant differential pressure valve chamber, flow control devices either one or both of which are actuated relation with the engine conditions. CONSTITUTION:An air flow meter 1 detects with its diaphragm 11 a pressure difference between before and after an air flow detecting valve 10 in a suction pipe 9 and changes the opening area of a variable orifice 13 of a valve 12, if the pressure difference is diverted from a certain level. Then a fuel flow meter 2 controls an actuator 14 to modifiy the opening of said valve 10. A solenoid valve 19 and throttle 20 are set upstream and downstream of a chamber e of a constant differential pressure valve 3 which is set for keeping the fuel pressure difference between before and after a metering port 18 at a certain level, the solenoid valve 19 being controlled by an electronic control unit 21 in accordance with the engine conditions. A differential pressure control valve 26 is connected to bypass the solenoid valve 19 and throttle 20. |
