US 2011/0225958 A1 · EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE

Abstract

An exhaust purification system provided with an exhaust manifold, a catalytic converter which is arranged at a downstream side of the exhaust manifold an angle with respect to the exhaust manifold and which houses an NOx storage and reduction catalyst, and a reducing agent feed system which feeds reducing agent into exhaust gas which passes through the inside of the exhaust manifold. The part of the inner wall surface of the casing of the catalytic converter which faces the exhaust manifold outlet is provided with a projecting part which projects out toward the diametrically outward direction of the casing. Part of the wall surface which defines the projecting part is formed so that a velocity component, in an axial direction of the casing, of at least part of the flow of exhaust gas which flows into the projecting part, is oriented in an opposite direction to the direction heading toward the NOx storage and reduction catalyst. The exhaust purification system of an internal combustion engine which suppresses an increase in pressure loss of the exhaust gas and causes the reducing agent which was fed from the reducing agent feed system to disperse in the exhaust gas is provided.

Claims24

Dependent claims

An exhaust purification system of an internal combustion engine which is provided with an upstream side exhaust passage through which exhaust gas which is exhausted from the internal combustion engine passes, a downstream side exhaust passage which is arranged at a downstream side of said upstream side exhaust passage at an angle with respect to the upstream side exhaust passage, a reducing agent feeding device which feeds reducing agent into the exhaust gas which passes through the inside of the upstream side exhaust passage, and an exhaust purifying device which is provided inside the downstream side exhaust passage,

wherein, the part of the inner wall surface, which defines the downstream side exhaust passage and faces the upstream side exhaust passage outlet, is provided with a flow deflection part, and said flow deflection part is positioned at the upstream side from the exhaust purifying device and is formed so that a velocity component, in an axial direction of a downstream side exhaust passage, of at least part of the flow of exhaust gas which flows into said flow deflection part is oriented in an opposite direction to the direction heading toward the exhaust purifying device, and wherein a cross-sectional area of the downstream side exhaust passage is constant from where the exhaust gas flows out from said flow deflection part to where it reaches the exhaust purifying device.

wherein, the part of the inner wall surface, which defines the downstream side exhaust passage and faces the upstream side exhaust passage outlet, is provided with a flow deflection part, said flow deflection part is positioned at the upstream side from the exhaust purifying device, and a wall surface of said flow deflection part is formed so that at least part of the exhaust gas which strikes part of the wall surface of said flow deflection part and is increased in velocity component in the direction heading toward an exhaust purifying device strikes another part of the wall of surface of said flow deflection part and is lowered in velocity component of the same direction of said exhaust gas, and wherein a cross-sectional area of the downstream side exhaust passage is constant from where the exhaust gas flows out from said flow deflection part to where it reaches the exhaust purifying device.

Dependencies are inferred from the claim text.

Exhaust purification system of internal combustion engine

Life of this patent

Exhaust purification system of internal combustion engine

Life of this patent

Abstract

Claims24