PURPOSE: To aim at obtaining a high output power with one single large diameter intake-air passage and as well to enhance the control accuracy of air-fuel ratio in a range where the amount of intake-air is small, by providing venturies and a throttle valve in an intake-air passage so that the flow rate of fuel and the amount of intake-air are controlled by pressurized air controlled by a single solenoid valve.
CONSTITUTION: Ventureis 3, 4, a throttle vavle 5 and an injection valve 11 are disposed in an intake-air passage 2. A solenoid valve 15 is controlled by an operating condition signal received by a control unit 47. Upon starting the solenoid valve 15 is opened so that pressurized air is fed through an air passage 27 to a control chamber 20 in a fuel regulator 13 to decrease the opening degree of a relief valve 23 so that the injection amount of fuel from a fuel injection port 12 is increased. Further pressurized air introduced into a control chamber 40 in an intake-air controller 39 through an air passage 29 is decreased so that the opening degree of a throttle valve 5 is increased by means of a cam 45. An air regulator 14 controls the pressure of air pressurized by an air pump 9.
FURUMOTO MICHITAKE
HARADA SHINICHI
YAMAOKA KEIGO
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