| 摘要 |
PURPOSE:To stably and accurately feed power fuel, by providing a switch mechanisms which opens an on-off valve located in a power fuel passage through which a part of gas fuel is fed to an intake air system. CONSTITUTION:A pressure reducing regulator 21, serving to reduce the pressure of gas fuel, and a mixer 28, mixing together gas fuel and air, are provided. A power fuel passage 39 feeds a part of gas fuel, fed to the pressure reducing regulator 21, to an intake air system 27. An electromagnetically-driven on-off valve 42 is situated in the power fuel passage 39. A switch mechanism 47 is actuated so as to open the on-off valve 42 in a high load region in linkage with a throttle valve 37 of the intake air system 27. This enables power fuel to be stably and accurately fed to a high load region, and permits improvement of an output.
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