| 摘要 |
PROBLEM TO BE SOLVED: To perform control so as to suppress fluctuation of torque and improve exhaust gas emission when switching between premixed compression ignition and spark ignition in an internal combustion engine for switching and executing premixed compression self ignition combustion and spark ignition combustion according to an operation region. SOLUTION: In the internal combustion engine including a variable valve gear for continuously changing a valve opening timing and a valve closing timing of an intake valve and an exhaust valve, switching is made to one of the premixed compression self ignition combustion for injecting fuel in a negative overlap period when both of the intake valve and the exhaust valve close near an exhaust top dead center, and the spark ignition combustion which is at least a homogeneous combustion, according to the operation state and the combustion is executed. When switching between the premixed compression self ignition combustion and the spark ignition combustion, a fuel injection amount is set so that the air-fuel ratio becomes close to the theoretical air-fuel ratio, fuel of the set injection amount is injected at a timing at which the homogeneous combustion is performed, and spark ignition combustion is executed by delaying the ignition timing. COPYRIGHT: (C)2010,JPO&INPIT
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