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Exhaust gas purification apparatus for internal combustion engine

一种排气净化装置、内燃机的技术，应用在排气装置、排气处理装置的电控、排气处理装置的诊断装置等方向，能够解决难净化等问题

Active Publication Date: 2018-09-14
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when ammonia is reduced due to oxidation of ammonia, the NOx catalyst is insufficient in ammonia, so it becomes difficult to purify NOx

Method used

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  • Exhaust gas purification apparatus for internal combustion engine
  • Exhaust gas purification apparatus for internal combustion engine
  • Exhaust gas purification apparatus for internal combustion engine

Examples

Experimental program
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Effect test

Embodiment 1

[0051] figure 1It is a figure which shows the schematic structure of the internal combustion engine 1 concerning this Example, its intake system, and an exhaust system. The internal combustion engine 1 is a diesel engine for driving a vehicle. However, the internal combustion engine 1 may also be a gasoline engine. An exhaust passage 2 is connected to the internal combustion engine 1 . A selective reduction NOx catalyst 3 (hereinafter referred to as "NOx catalyst 3") that selectively reduces NOx in exhaust gas using ammonia as a reducing agent is provided in the exhaust passage 2 .

[0052] An addition valve 4 for adding urea water, which is a precursor of ammonia, to the exhaust gas is provided in the exhaust passage 2 upstream of the NOx catalyst 3 . The urea water added through the addition valve 4 is hydrolyzed into ammonia, which is adsorbed on the NOx catalyst 3 . This ammonia is used as a reducing agent in the NOx catalyst 3 . Furthermore, the addition valve 4 may ...

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PUM

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Abstract

The invention relates to an exhaust gas purification apparatus for an internal combustion engine. In order to supply a reducing agent to an NOx catalyst in an appropriate manner when the temperature of the NOx catalyst is high, in case where the temperature of the NOx catalyst is equal to or higher than a predetermined temperature at which ammonia is oxidized, and in case where an NOx reduction rate in the NOx catalyst is smaller than a predetermined lower limit reduction rate, when the addition of the additive agent is carried out at least twice by changing an equivalent ratio with respect toan amount of NOx flowing into the NOx catalyst, the equivalent ratio in equivalent ratio control is made larger in the case where an amount of change of an amount of reduction of NOx accompanying a change of the equivalent ratio is larger than an amount of change of an amount of oxidation of ammonia accompanying the change of the equivalent ratio, than in the case where it is smaller than that.

Description

technical field [0001] The present invention relates to an exhaust purification device for an internal combustion engine. Background technique [0002] A selective reduction type NOx catalyst (hereinafter also simply referred to as "NOx catalyst") that purifies NOx contained in exhaust gas from an internal combustion engine by using ammonia as a reducing agent is known. An addition valve and the like for adding ammonia or a precursor of ammonia (hereinafter, ammonia or a precursor of ammonia may also be referred to as "additive") to exhaust gas are provided on the upstream side of the NOx catalyst. As a precursor of ammonia, urea can be exemplified. [0003] In such a NOx catalyst, when the temperature of the NOx catalyst becomes high, the adsorbed ammonia is desorbed and the ammonia flows out from the NOx catalyst. In addition, when the temperature of the NOx catalyst becomes high, ammonia is oxidized in the NOx catalyst to generate NOx. In addition, when the amount of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N9/00F01N11/00
CPCF01N3/2066F01N3/208F01N9/00F01N11/00F01N2550/02F01N2560/06F01N2610/02F01N2900/1402F01N2900/1602F01N2900/1621Y02T10/12Y02T10/40B01D53/9418B01D53/9431B01D53/9495F01N2610/148
Inventor 大串真雄松本有史冢本佳久西冈宽真
Owner TOYOTA JIDOSHA KK
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