Patent ID: 7628013
Filing Date: 2009-12-08
Classification: F02B,F02D

Abstract:
1. A control device of a multi-cylinder 4-cycle charge compression ignition-type internal combustion engine having three or more cylinders each of which includes an intake port formed in a cylinder head for supplying air to a combustion chamber, an intake valve for opening and closing the intake port, an exhaust port formed in the cylinder head for exhausting combustion gas in the combustion chamber from the combustion chamber and an exhaust valve for opening and closing the exhaust port, the engine having an exhaust path including a plurality of independent passages communicating with respective exhaust ports of the plurality of cylinders and a collecting portion in which the combustion gas flowing through the passages joins together, wherein four strokes of an intake stroke from an exhaust top dead center to an intake bottom dead center, a compression stroke from the intake bottom dead center to a compression top dead center, an expansion stroke from the compression top dead center to an expansion bottom dead center and an exhaust stroke from the expansion bottom dead center to the exhaust top dead center are repeated in the respective cylinders every time a crankshaft rotates by 720 degrees, a crank angle between the exhaust top dead center of one of the plural cylinders and the exhaust top dead center of another cylinder that reaches its exhaust top dead center immediately after the exhaust top dead center of the one cylinder of the plural cylinders is an angle obtained by dividing 720 degrees by the number of the cylinders, and air-fuel mixture formed in the combustion chamber is compressed in the compression stroke and is ignited by itself, the control device comprising: an exhaust flow rate regulating valve which is disposed in the collecting portion of the exhaust path and whose opening is controlled so that an amount of the combustion gas exhausted to the exterior of the engine via the collecting portion of the exhaust path is changed by varying a cross-sectional opening area of the collecting portion; and a controller that: