| 摘要 |
PROBLEM TO BE SOLVED: To improve the fuel consumption by performing lean combustion, to effectively perform the compressive self-ignition in a part of cylinders, to effectively perform the combustion by compressive self-ignition in a wide operating range, and to improve the fuel consumption and emission. SOLUTION: An intake/exhaust circulating state is controlled, so that the burned gas discharged from advanced cylinders 2A, 2D at an exhaust stroke side is led to trailing cylinders 2B, 2C at an intake stroke side as it is through a cylinder gas passage 22 between a pair of cylinders where the exhaust stroke and the intake stroke are overlapped, in a partial load area of an engine. A combustion state control means 44 performs the control so that an air-fuel ratio of the trailing cylinders 2B, 2C becomes substantially a theoretical air-fuel ratio, and an air-fuel ratio of the advanced cylinders 2A, 2D becomes a value smaller than two times of the theoretical air-fuel ratio by increasing the fuel supply amount to the advance cylinders 2A, 2D in comparison with that to the trailing cylinders 2B, 2C, further the forcible ignition is performed in the advanced cylinders 2A, 2D, and the compressive self-ignition is performed in the trailing cylinders 2B, 2C. COPYRIGHT: (C)2004,JPO |
