| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-cylinder internal combustion engine capable of activating catalyst early without impairing fuel economy in various engines. SOLUTION: This multi-cylinder internal combustion engine is provided with branch ports 31, 32, 33, 34 arranged separately from intake and exhaust ports per cylinder and communicating with a combustion chamber in the cylinder, communicating valves 21, 22, 23, 24 mounted per branch port to open and close the ports, a communicating chamber 20 communicating each branch port, a new air supply means 30 for supplying pressurized air into the communicating chamber, an opening and closing timing adjusting means 50 for controlling opening and closing time of an exhaust valve opening and closing the exhaust port, and a control means 61 for operating and controlling the new air supply means, the communicating valves, and the opening and closing timing adjusting means in accordance with engine operation condition. The control means opens, closes, and controls the communicating valves by driving the new air supply means to quicken valve closing time of the exhaust valve in the cylinder in an exhaust process than normal time and has control mode for opening the communicating valves in the cylinder in the exhaust process from predetermined time in an expansion process to predetermined time in the exhaust process. COPYRIGHT: (C)2005,JPO&NCIPI
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