| 摘要 |
PROBLEM TO BE SOLVED: To appropriately return an internal combustion engine from an unstable operation condition to a stable operation condition when controlling a significant delay in ignition timing for warming up an exhaust emission control catalyst for the internal combustion engine. SOLUTION: In a two-dimensional space for an engine speed and a load factor, when an engine operation condition enters an unstable area caused by the amount of intake air (Fa=ON, Yes in S124) or an unstable area caused by a combustion state (Fb=ON, Yes in S130), a process is performed for exiting from each unstable area (S128 or S134). Throttle opening Ta control (S128) is performed for exiting from the unstable area caused by the amount of intake air. Ignition timing control and fuel injection timing control (S134) are performed for exiting from the unstable area caused by the combustion state. In the significant delay in the ignition timing for warming up the exhaust emission control catalyst, an unstable operation factor is determined by each unstable area and an appropriate process in response to each unstable area is performed. Therefore, the engine can be appropriately returned from the unstable operation condition to the stable operation condition. COPYRIGHT: (C)2009,JPO&INPIT
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