| 摘要 |
PROBLEM TO BE SOLVED: To provide a premixed compression ignition engine capable of preventing misfire by inhibiting air fuel mixture from getting excessively lean when a throttle opens in change over from spark ignition combustion to premixed compression ignition combustion. SOLUTION: This premixed compression ignition engine operates with changing over combustion state between spark ignition combustion and premixed compression combustion with keeping a negative overlap period. A throttle adjusts intake air quantity and a fuel valve adjusts supply quantity of fuel supplied to an intake air passage. ECU controls the throttle to increase opening thereof from opening during steady state operation of spark ignition combustion to opening during steady state operation of premixed compression combustion in change over period from spark ignition combustion to premixed compression ignition combustion (refer to A) and controls the fuel valve to make quantity of fuel supplied to the intake air passage greater than supply quantity of fuel during steady state operation of spark ignition combustion (refer to B). COPYRIGHT: (C)2008,JPO&INPIT
|
