| 摘要 |
In a fuel gas mixer 1 including a throttle valve 4 provided in an air intake passage 2 connected to an engine for opening and closing the air intake passage 2 and a fuel gas supply passage 6 connected to the air intake passage 2 upstream of the throttle valve 4 . A fuel gas control valve 5 is provided in the air intake passage 2 upstream of the connecting part of the fuel gas supply passage 6 for opening and closing the air intake passage 2 , and a fuel gas control value controlling means 11 is provided for varying the degree of the opening of the fuel gas control value 5 depending upon the operating state of the engine.
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