| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel supply device for four-cycle engine capable of establishing an improvement of the response even at the time of lean operation, a reduction of the incremental fuel amount for acceleration. a reduction of the emission of unburned HC at the time of fuel cut, etc., by eliminating attachment to the wall surfaces and forming a proper mixture gas quickly which is supplied to a combustion chamber. SOLUTION: The combustion chamber 2 is equipped with a suction passage 3 to introduce the outer air through a suction valve 7, and an injector 15 to inject the fuel is installed in the neighbourhood of a suction port 5 which is opened and closed by the suction valve 7 installed in the suction passage 3, and a fuel injection passage 16 is formed in such an arrangement that the fuel jetted from the injector 15 is injected from the suction port 5 in the tangential direction of the combustion chamber 2, while the suction passage 3 is furnished with a first throttle valve 10 which performs the opening/closing operations from a partial load range to a high load range, and downstream of the first throttle valve 10, a second throttle valve 11 is installed which is closed fully in the partial load range and performs the opening/closing operations in the high load range, and further the fuel injection passage 16 is furnished with an air supplying means which introduces approximately the whole amount of requisite air at the time of partial load and mixes it with the fuel injected from the injector 15.
|
