| 摘要 |
PROBLEM TO BE SOLVED: To improve thermal efficiency of an internal combustion engine using reformed gas fuel as main fuel. SOLUTION: This engine is provided with at least reforming catalyst 230 reforming liquid fuel to gas fuel containing a plurality of gas components, an evaporator 220 for supplying gasified fuel to the reforming catalyst 230, a flow rate sensor 140 detecting flow rate of liquid fuel to the evaporator 220, and a catalyst temperature sensor 146 detecting reformed catalyst temperature. When liquid fuel is reformed by steam, water flow rate detection is also executed. An ECU 100 estimates reformed gas composition by using at least detection values of a flow rate sensor and a catalyst temperature sensor and referring a corresponding map of gas composition and a detection value stored inside. An estimated value is corrected according to measured specific gas composition concentration in the reformed gas and a detection value of temperature of input and output gas to and from the catalyst. The ECU 100 operates lean combustion limit concentration of air fuel mixture in a cylinder based on the estimated vale, and always materializes operation in a vicinity of lean combustion limit by controlling gas fuel supply quantity and air flow rate. COPYRIGHT: (C)2008,JPO&INPIT
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