CONTROL DEVICE OF FEED PRESSURE TO FUEL INJECTION VALVE

PURPOSE:To prevent a decrease of flow speed of fuel fed from a low pressure fuel injection valve, by changing area of an orifice in the upstream of a throttle valve bypass passage at high load operation in accordance with a decrease of intake negative pressure. CONSTITUTION:A solenoid valve 16, varying air orifice area, is provided to an air orifice 15 in the inlet of a bypass passage 12, and an electric signal from an intake negative pressure sensor 17, detecting intake negative pressure in an intake pipe 7, is input to a solenoid valve control circuit 18, then fully or partially of fuel in lines of low speed, acceleration, starting and output is fed by a low pressure fuel injection valve 11 to arrange the amount, added with a feed amount of the main fuel system, equal to a required fuel amount of an engine. For negative pressure in the intake pipe at higher negative pressure side from pressure in a certain value P, the solenoid valve 16 is controlled to be fully opened, then in a range of 10 mode acceleration operation, delivery pressure of the fuel injection valve can be held to constant.