| 摘要 |
<P>PROBLEM TO BE SOLVED: To expand the operation output band of a compression self-ignition internal combustion engine and facilitate change over to other operation modes. Ž<P>SOLUTION: In a four-cycle compression self-ignition internal combustion engine using gasoline as fuel, an auxiliary chamber 103 is provided and a communication part to a main combustion chamber 106 is partitioned by a communication valve 105. A spark plug 104 and an intake valve for supplying air fuel mixture are provided in the auxiliary chamber. The communication valve is opened in an intake process, an intake valve 102 of the auxiliary chamber is opened at a later half of the process, rich air fuel mixture for plug ignition is supplied to the auxiliary chamber, and the communication valve is closed near CA corresponding to compression ratio 9. Compression further progresses in the main combustion chamber and front flame reaction starts. However, compression ratio is set to pressure before self ignition. Ignition is done by the spark plug of the auxiliary chamber near a top dead center. When pressure of the auxiliary chamber exceeds pressure of the main combustion chamber, the communication valve is opened, gas after combustion flows in the main combustion chamber, and air fuel mixture in the main combustion chamber is compressed again. Since front flame reaction progresses, ignition occurs in a short period of time and pressure rises, and the communication valve is closed. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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