Exhaust system of internal combustion engine

Abstract

A first control valve is disposed downstream of a junction point of a first exhaust passage, and a second catalytic converter is disposed downstream of a junction point of the second exhaust passage. The first control valve and the second control valve are controlled so that the exhaust gas of all of the cylinders mainly passes one of the first catalytic converter disposed in the first exhaust passage and the second catalytic converter disposed in the second exhaust passage during a fuel-supply cutoff period.

Description

technical field [0001] The invention relates to an exhaust system of an internal combustion engine. Background technique [0002] In the exhaust system of an internal combustion engine with multiple cylinders, such as a V-type engine, all cylinders are divided into two cylinder groups, each cylinder group is provided with an exhaust manifold, and for each cylinder group an exhaust The exhaust passages extend from the respective exhaust manifolds to an exhaust confluence point where the exhaust flows from the individual exhaust passages merge together. In this type of exhaust system, it has been proposed to arrange the turbine of the turbocharger and the catalytic converter downstream of the turbine in only one of the exhaust ducts, and this exhaust duct is at the connection point upstream of the turbine It communicates with the connection point of another exhaust passage, and meanwhile, the control valve is arranged downstream of the connection point of the other exhaust pa...

AI Technical Summary

Problems solved by technology

If a single catalytic converter deteriorates due to deterioration of the catalyst, the exhaust gas cannot be purified

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