| 摘要 |
PROBLEM TO BE SOLVED: To rapidly disperse remaining fuel when a gaseous fuel engine is started so as to shorten a start time by arranging a throttle valve bypassing passage communicated with both upper and lower sides of a throttle valve bypassing the throttle valve, and arranging a downstream side outlet on an upper part of a gravity direction of an intake passage. SOLUTION: When an engine is stopped, fuel gas leaked from a fuel injection mechanism 3 is led to a surge tank 4 through an intake manifold 2, and it stagnates on an upper expansion part 8. When the engine is restarted in this condition, a throttle valve 10 is closed, an ISC valve 7 is opened, and intake air passes a throttle valve bypassing passage 5 of a throttle body 6. Since a downstream side outlet 13 of the bypass passage 5 is arranged on an upper part of the intake passage, air which flows out from the outlet 13 flows on an upper part of the intake passage. As a result, since air flow flows into the upper expansion part 8, remaining fuel gas can be rapidly dispersed. |
