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Exhaust purification device of internal combustion engine

a technology of exhaust purification device and internal combustion engine, which is applied in the direction of machines/engines, mechanical equipment, separation processes, etc., can solve the problems of /sub>x ending up being stored

Inactive Publication Date: 2008-12-11
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]An object of the present invention is to provide an exhaust purification device of an internal combustion engine capable of suppressing the SOx released from an SOx trap catalyst to be stored in an NOx storage catalyst.

Problems solved by technology

However, fuel and lubrication oil contain sulfur.
However, if making the SOX trap catalyst release SOX in this way, since the NOX storage catalyst has a strong basicity, even if the air-fuel ratio of the exhaust gas is rich, the problem arises that the released SOX ends up being stored in the NOX storage catalyst.

Method used

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  • Exhaust purification device of internal combustion engine
  • Exhaust purification device of internal combustion engine
  • Exhaust purification device of internal combustion engine

Examples

Experimental program
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Embodiment Construction

[0016]FIG. 1 is an overview of a compression ignition type internal combustion engine.

[0017]Referring to FIG. 1, 1 indicates an engine body, 2 a combustion chamber of each cylinder, 3 an electronically controlled fuel injector injecting fuel into each combustion chamber 2, 4 an intake manifold, and 5 an exhaust manifold. The intake manifold 4 is connected through an intake duct 6 to a compressor 7a of an exhaust turbocharger 7, while an inlet of the compressor 7a is connected through an intake air detector 8 to an air cleaner 9. Inside the intake duct 6, a throttle valve 10 driven by the step motor is arranged. Further, around the intake duct 6, a cooling device 11 for cooling the intake air flowing through the intake duct 6 is arranged. In the embodiment shown in FIG. 1, the engine cooling water is led into the cooling device 11 where the engine cooling water is used to cool the intake air.

[0018]On the other hand, the exhaust manifold 5 is connected to an inlet of an exhaust turbin...

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PUM

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Abstract

An SOX trap catalyst 12 and NOX purification catalyst 13 are arranged in an engine exhaust passage. A substrate 50 of the NOX purification catalyst 13 is formed with a coat layer comprised of at least the two layers of an upper coat layer 51 and a lower coat layer 52. The lower coat layer 52 is formed from an NOX storage catalyst storing the NOX contained in the exhaust gas when the air-fuel ratio of the exhaust gas is lean and releasing the stored NOX when the air-fuel ratio of the exhaust gas is a stoichiometric air-fuel ratio or rich. The upper coat layer 51 is formed from a material of a weaker basicity than this NOX storage catalyst.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an exhaust purification device of an internal combustion engine.[0003]2. Description of the Related Art[0004]Known in the art is an internal combustion engine arranging in an engine exhaust passage an NOX storage catalyst storing NOX contained in exhaust gas when the air-fuel ratio of the inflowing exhaust gas is lean and releasing the stored NOX when the air-fuel ratio of the inflowing exhaust gas becomes a stoichiometric air-fuel ratio or rich. In this internal combustion engine, NOX formed when burning fuel under a lean air-fuel ratio is stored in the NOX storage catalyst. On the other hand, as the NOX storage catalyst approaches saturation of the NOX storage ability, the air-fuel ratio of the exhaust gas is temporarily made rich, whereby NOX is released from the NOX storage catalyst and reduced.[0005]However, fuel and lubrication oil contain sulfur. Therefore, the exhaust gas also co...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N3/28
CPCF01N3/0814F01N3/0842F01N3/085F01N2510/06F01N2510/0684F01N2570/04F01N2610/03F01N13/0097F01N13/0093F01N13/009
Inventor YOSHIDA, KOHEIASANUMA, TAKAMITSUNISHIOKA, HIROMASAHIROTA, SHINYAOTSUKI, HIROSHI
Owner TOYOTA JIDOSHA KK