| 摘要 |
PROBLEM TO BE SOLVED: To provide a compression ignition internal combustion engine and its exhaust gas circulation amount control method capable of obtaining a compression end temperature sufficient for ignition without using a heating device by circulating exhaust gas with good efficiency. SOLUTION: An exhaust valve means comprising two exhaust valves is provided to a compression ignition internal combustion engine. In an exhaust stroke, a first exhaust valve is opened to exhaust the exhaust gas (D), and a second exhaust valve is opened immediately before the end of the exhaust stroke to a first half of an intake stroke for circulating the exhaust gas (E). In the intake stroke, the second exhaust valve continues to open for a predetermined time keeping a micro lift volume t constant, and the micro lift volume t remains a value less than a safe lift volume not interfered with a piston of an upper dead center. After the second exhaust valve is fully opened, the intake valve is opened so as to absorb mixture of air and fuel (F). COPYRIGHT: (C)2005,JPO&NCIPI
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