Fuel injection type internal combustion engine

摘要

An internal combustion engine with a vertically extending intake duct leading to the collecting portion of the intake manifold and a throttle valve in the intake duct has a main fuel injector and an auxiliary fuel injector arranged in the intake duct downstream of the throttle valve. An amount of fuel which is proportional to the amount of the sucked air is intermittently injected into the intake duct from the main fuel injector. At least a fixed small amount of fuel is in effect continuously injected from the auxiliary fuel injector, with additional amounts being temporarily supplied during engine startup and acceleration.