| 摘要 |
PROBLEM TO BE SOLVED: To improve fuel consumption by preventing knock and self-ignition in a high load region without causing reduction of output torque or reduction of fuel consumption. SOLUTION: A reference value, Aino is calculated based on an engine speed Ne (S100), it is determined whether or not an intake air amount, Ain indicating an engine load exceeds the reference value, Aino (S150), the operation mode of the engine 10 is set at a spark ignition mode (S200) when the intake-air amount, Ain is the reference value or lower, the operation mode of the engine 10 is set at a diffusion combustion mode (S250) when the intake-air amount, Ain exceeds the reference value, and the engine is operated in the set mode (S300). The reference value, Aino is varied and set in response to a parameter such as ignition property or the like of the fuel so that the higher the ignition property is, the lower the reference value, Aino is, for example. COPYRIGHT: (C)2004,JPO&NCIPI
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