| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a gas engine system which suppresses fluctuation in an air-fuel ratio of a gas engine using biogas as fuel, and prevents the excessive emission due to the fluctuation of the air-fuel ratio, performance deterioration of thermal efficiency and misfire and hunting due to poor combustion. <P>SOLUTION: A gas engine system 1 includes a gas engine 2 of biogas, an exhaust temperature sensor 24, an engine rotation speed sensor 26, a fuel control valve 14, a throttle 16 and a control device 3 for controlling rotation speed of the gas engine 2 to a prescribed rotation speed. The control device 3 contains a target exhaust temperature map 31 in which a relationship between an exhaust temperature and air-fuel ratio is set for each engine load. A target exhaust temperature at an engine load detected by the engine rotation speed sensor 26 and a target air-fuel ratio corresponding to the target exhaust temperature in an engine load are acquired from the target temperature map 31. The fuel control valve 14 and throttle 16 are controlled so that the exhaust temperature detected by the exhaust temperature sensor 24 becomes the target exhaust temperature, and the air-fuel ratio becomes a target air-fuel ratio. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
