Patent ID: 7096833
Filing Date: 2006-08-29
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A control device for a multicylinder supercharged engine of which individual cylinders go through successive cycles of intake, compression, expansion and exhaust strokes with specific phase delays, in which, of a pair of cylinders whose exhaust and intake strokes overlap each other, the cylinder which is currently in the exhaust stroke serves as a preceding cylinder while the cylinder which is currently in the intake stroke serves as a following cylinder, gas flow paths are configured such that burned gas discharged from the preceding cylinder is introduced directly into the following cylinder through an intercylinder gas channel and gas discharged from only the following cylinder is led to an exhaust passage, and said engine is provided with a supercharger for supercharging intake air supplied to the preceding cylinder and a three-way catalyst disposed in the exhaust passage, said control device comprising: a controller for controlling fuel supply to the individual cylinders in such a manner that combustion in the preceding cylinder is made under lean mixture conditions at an air-fuel ratio larger than the stoichiometric air-fuel ratio and combustion in the following cylinder is made at an air-fuel ratio equal to or smaller than the stoichiometric air-fuel ratio by supplying fuel to the burned gas of a large air-fuel ratio introduced from the preceding cylinder in all operating ranges of the engine.