| 摘要 |
PROBLEM TO BE SOLVED: To suppress the build-up of deposits on a jet portion of a fuel injection valve even when using mixed fuel different in alcohol concentration. SOLUTION: An alcohol concentration sensor is used for calculating the nature of fuel, and a fuel injection amount is controlled corresponding to the nature of the fuel (Steps S10, 11). The upper limit temperature of the jet portion of an injector is estimated from th nature of the fuel, and the temperature of the jet portion is estimated from a current operated condition with a map (Steps S12, 13). When the estimated temperature of the jet portion exceeds the upper limit temperature (NO in Step S14) and a cumulative time for fuel injection performed in the condition of exceeding the upper limit temperature exceeds a preset time (YES in Steps S16, 17), fuel injection pressure is made greater under homogeneous combustion than in normal injection to clean deposits in an initial built-up condition. COPYRIGHT: (C)2005,JPO&NCIPI
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