Patent ID: 6751949
Filing Date: 2004-06-22
Classification: F01N,F02B,F02D,Y02T

Abstract:
An exhaust emission control device of a multi-cylinder internal-combustion engine, comprising:exhaust flow control means for restraining an exhaust flow so as to enhance the effect of reduction of the delivery of harmful substances at the start of operation of the internal-combustion engine; secondary air supply means for supplying oxygen-rich exhaust gas to an exhaust system of said internal combustion engine at the start of operation of said internal-combustion engine by stopping fuel supply to some of the cylinders or carrying out lean-A/F operation; and air-fuel ratio control means for adjusting the combustion air-fuel ratio of-the other cylinders of said internal-combustion engine to a rich air-fuel ratio at the start of operation of said internal-combustion engine.