| 摘要 |
PROBLEM TO BE SOLVED: To optimize ignition energy based on a method for forming stratified charge mix in a case of directly injecting fuel into a combustion chamber 4 by a fuel injection valve 11 to form the stratified charge mix around a spark plug 12, and ignite the stratified charge mix for performing stratified charge combustion. SOLUTION: Stratified charge combustion of a shorter interval from fuel injection timing to ignition timing than a prescribed value (that is, for example, stratified charge combustion to form stratified charge mix in an inner cavity 14 and space above it by delaying fuel injection timing in low load operation conditions) is compared with stratified charge combustion of a longer interval from fuel injection timing to ignition timing than the prescribed value (that is, for example, stratified charge combustion to form stratified charge mix in an outer cavity 15 and space above it by quickening fuel injection timing in high load operation conditions) for increasing energization time to the ignition coil so as to increase ignition energy. COPYRIGHT: (C)2006,JPO&NCIPI
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