| 摘要 |
PROBLEM TO BE SOLVED: To improve the performance of stratified stoichiometric combustion for raising the exhaust gas temperature. SOLUTION: When, after starting, combustion is swiched to a stratified stoichiomeric combustion, the fuel injection timing in the compression stroke is retarded gradually in accordance with the rise of the combustion chamber temperature presumed on the basis of the elapsed time after starting. Thereby the concentration and region of stratified mixture gas formed around the ignition plug during the stratified stoichiomeric combustion can be maintained approximately in the constant condition, and the exhaust gas temperature rising effect can be maintained well owing to stabilized combustion.
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