PURPOSE: To prevent fuel delay at the time of opening of an opening and closing valve by providing assist air passages opening earlier than the high speed side passage opening and closing valve on an injection valve disposed in a pipe communicating to respective passage of an engine having two independent intake passages for each cylinder.
CONSTITUTION: A first intake passage 7 and a second intake passage 7 are provided for each cylinder 2, and an opening and closing valve 12 opened by an actuator 11 operated at the time of high speed and high load of an engine by a signal of a control unit 29 transmitting a control signal according to opening 20 of a throttle valve 16 and a rotating number of the engine is provided on the second intake passage 8. A fuel injection valve 21 between both the intake passages 7, 8 is provided on a communicating path, and passages 26, 27 supplying assist air from the right and left into a nozzle unit of the fuel injection valve 21. A valve 28 in the passage 26 is opened a predetermined time before opening of the opening and closing valve 12 to supply injection fuel to the second intake passage 8 previously, then the opening and closing valve 12 is opened and fuel delay is prevented.
HATAOKA KENJI
ODA HIROYUKI
KAGEYAMA AKIRA
