Exhaust gas control apparatus for internal combustion engine

Abstract

An exhaust gas control apparatus applied to an internal combustion engine including plural cylinders and a turbocharger, wherein an exhaust passage includes first and second branch passages. The first branch passage connects exhaust sides of cylinders #and a turbine, and includes a starter catalyst; the second branch passage connects exhaust sides of cylinders #and the turbine, and communicates with the first branch passage upstream of the starter catalyst. The exhaust gas control apparatus includes an exhaust gas switching valve disposed at a communication part, through which the first and second branch passages are in communication, and is switchable between an introducing position at which exhaust gas is introduced into the starter catalyst from the cylinders #and a block position at which introduction thereof is blocked. An ECU switches the exhaust gas switching valve position based on the operating condition of the internal combustion engine.