Exhaust gas treatment apparatus and exhaust gas treatment method for internal combustion engine

Abstract

When a louver member able to diffuse exhaust gas over the entire area of a catalytic converter is incorporated in the exhaust passage, passage resistance of the exhaust gas increases and, in addition, the time to complete a warm-up of the internal combustion engine is extended, and this leads to deterioration of fuel economy. An exhaust gas treatment apparatus for an internal combustion engine includes an exhaust gas treatment unit (21, 22) arranged in an exhaust passage (18a) of the engine (10), an exhaust gas burble zone (Z1, Z2) in which an exhaust gas flowing along a part of a wall face (18e), which defines the exhaust passage, burbles away from the part of the wall face, and a plasma actuator (23, 31) arranged at the part of the wall face of the exhaust passage in the exhaust gas burble zone and configured to generate air current toward the exhaust gas treatment unit along the part of the wall face.

Description

technical field [0001] The invention relates to a device and a method for treating exhaust gases from an internal combustion engine. Background technique [0002] When the vehicle is intended to be downsized, the installation space of auxiliary equipment mounted on the vehicle is limited, and various piping paths and the like have to be greatly buckled. For example, since the exhaust turbine of the supercharger, the catalytic converter of the exhaust purification device, the muffler, etc. are closely arranged in the exhaust passage that guides the exhaust gas exhausted from the internal combustion engine mounted on the vehicle, so the connection Exhaust pipes of these components require substantial buckling. [0003] In addition, the passage cross-sectional area of ​​the catalytic converter of the exhaust gas purification device sometimes reaches several times the passage cross-sectional area of ​​the exhaust pipe in order to improve the purification efficiency of exhaust g...

AI Technical Summary

Problems solved by technology

As a result, the exhaust gas passing through the conical member flows into only a part of the catalytic converter without much diffusion, and the purification performance of the catalytic converter cannot be effectively maximized.

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