| 摘要 |
<P>PROBLEM TO BE SOLVED: To smooth the transition of modes while avoiding a problem occurring in a mode transition period, in a spark ignition type gasoline engine which performs the switching of modes between a compression ignition mode for executing compression ignition combustion and a spark ignition mode for executing spark ignition combustion. <P>SOLUTION: The control device (PCM 10) selects a compression ignition mode in a low load region, and selects a spark ignition mode in a high load region which relatively increases fuel pressure and drives a fuel ejection valve 67 so as to include fuel ejection executed at predetermined timing during a retard period from a later period of a compression stroke to an initial period of an expansion stroke, and then ignites fuel after the ejection. The control device also selects a switching mode which ejects fuel at fuel pressure in the spark ignition mode and at delayed timing later than predetermined timing during the predetermined transition period in switching the mode between the compression ignition mode and the spark ignition mode accompanied by a change of a load, and ignites the fuel after the ejection. <P>COPYRIGHT: (C)2012,JPO&INPIT |
