Exhaust gas purification device of internal combustion engine

An exhaust purification device and exhaust purification technology, which are applied in exhaust devices, internal combustion piston engines, exhaust gas treatment, etc., can solve problems such as the reduction of purification rate, and achieve the effect of high NOX purification rate

Active Publication Date: 2012-10-03
TOYOTA JIDOSHA KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But if there is NO X When the storage catalyst becomes h

Method used

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

Examples

Experimental program
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Example Embodiment

[0039] figure 1 Shows the overall diagram of a compression ignition internal combustion engine.

[0040] Reference figure 1 , 1 denotes the main body of the internal combustion engine, 2 denotes the combustion chamber of each cylinder, 3 denotes an electronically controlled fuel injection valve for injecting fuel into each combustion chamber 2, 4 denotes an intake manifold, and 5 denotes an exhaust manifold. The intake manifold 4 is connected to the outlet of the compressor 7 a of the exhaust turbocharger 7 via the intake pipe 6, and the inlet of the compressor 7 a is connected to the air filter 9 via the intake air amount detector 8. A throttle valve 10 driven by a stepping motor is arranged in the intake duct 6, and a cooling device 11 for cooling the intake air flowing in the intake duct 6 is also arranged around the intake duct 6. in figure 1 In the illustrated embodiment, the engine cooling water is introduced into the cooling device 11, and the intake air is cooled by the e...

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Abstract

In the engine exhaust passage of an internal combustion engine are arranged an exhaust gas purifying catalyst (13) and a hydrocarbon supply valve (15). A first and second hydrocarbon supply method are selectively utilized, wherein the first hydrocarbon supply method injects the hydrocarbons from the hydrocarbon supply valve (15) at a supply interval ([delta] T) pre-defined such that the air-fuel ratio of the exhaust gas is reduced to the minimum required air-fuel ratio (X) and purifies the NOx contained in the exhaust gas, and the second hydrocarbon supply method reduces the amount of hydrocarbons supplied from the hydrocarbon supply valve (15) and supplies fuel to a fuel combustion chamber (2) during the late expansion stroke or exhaust stroke.

Description

technical field [0001] The present invention relates to an exhaust purification device for an internal combustion engine. Background technique [0002] An internal combustion engine is known in which NO X occlusion catalyst, the NO X The storage catalyst stores NO contained in the exhaust gas when the air-fuel ratio of the inflowing exhaust gas is lean. X , when the air-fuel ratio of the inflowing exhaust gas is a rich air-fuel ratio, the occluded NO is released X , in NO X In the exhaust passage of the internal combustion engine upstream of the occlusion catalyst, an oxidation catalyst with an adsorption function is arranged. X The occlusion catalyst releases NO X At this time, hydrocarbons are supplied to the exhaust passage of the internal combustion engine upstream of the oxidation catalyst, so that the inflow of NO X The air-fuel ratio of the exhaust gas storing the catalyst becomes rich (for example, refer to Patent Document 1). [0003] In this internal combust...

Claims

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Application Information

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IPC IPC(8): F01N3/36F01N3/08
CPCF02D41/0275F01N3/0842F01N3/0871F01N3/208F01N2240/30F01N2610/03F02D41/405F02D41/024Y02T10/24Y02T10/44F01N2900/0422F01N3/0821F01N3/0814B01D53/9431Y02T10/26F01N3/0253F01N3/206Y02T10/12Y02T10/40
Inventor 梅本寿丈吉田耕平井上三树男
Owner TOYOTA JIDOSHA KK
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