FUEL SUPPLY CONTROLLER FOR INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To use the reflux rate computed in terms of the pressure differential between the upper and lower courses than an orifice for compensating the relation between suction negative pressure and load so that a suction negative pressure proper for new fuel is obtained to enable the new fuel to be fed at a proper rate. CONSTITUTION:The exhaust reflux passage connected with an exhaust passage 2 communicates with a suction passage 3 via a control valve 6 and an orifice 6. The negative pressure chamber of a control valve 5 is connected to the suction passage 3 on the lower course side than a throttle valve 7 to make exhaust gas reflux in accordance with the suction rate of an engine. One end of a negative-pressure introducing passage 12 is connected to a chamber 11C counter to an evacuated pressure chamber 11D, and the other to a chamber 13C counter to a chamber 13D connected with the portion between the orifice 6 and control valve 5 by a passage 14. Therefore, the pressure differential between the upper and lower courses than an orifice is detected by the distortion gauges provided on the partition walls 11B and 13B of the chambers. Fuel injection control is performed in accordance with the suction negative pressure of a sensor 11 when a sensor 13 has no pressure differential and with the exhaust gas reflux rate to the sensor 13 when the sensor 13 has a pressure differential.