Apparatus and method for purifying exhaust gases in automotive engines

摘要

An exhaust gas purifying apparatus for vehicles having engines that perform lean combustion and purify exhaust gas with a catalytic converter (20) located in an exhaust passage includes a determining means (40) to determine whether the vehicle is moving and a temperature increasing means (40) that increases a temperature of the catalytic converter when the vehicle begins to move. The temperature increasing means increases the temperature of the catalytic converter by switching the combustion mode of the engine from lean combustion to stoichiometric combustion.