Exhaust purification device of internal combustion engine
a technology of purification device and internal combustion engine, which is applied in the direction of machine/engine, exhaust treatment electric control, separation process, etc., can solve the problem of no/sub>x/sub>purification rate falling, and achieve good nox purification rate
Inactive Publication Date: 2010-03-11
TOYOTA JIDOSHA KK
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Benefits of technology
The present invention provides an exhaust purification device for internal combustion engines that can effectively purify NOx even when there is a buildup of HC deposits on the selective reduction catalyst. The device raises the temperature of the catalyst to desorb the deposits and restore its activity, thus ensuring a good NOx purification rate. This technology helps to maintain the performance of the exhaust purification device and reduce emissions from the engine.
Problems solved by technology
In this regard, if the HC deposits at the NOx selective reduction catalyst, the problem will arise that the NOx selective reduction catalyst will no longer adsorb the ammonia and therefore the NOx purification rate will fall.
Method used
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Embodiment Construction
[0015]FIG. 1 shows an overview of a compression ignition type internal combustion engine.
[0016]Referring to FIG. 1, 1 indicates an engine body, 2a combustion chamber of each cylinder, 3 an electronic control type fuel injector for 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 the outlet of a compressor 7a of an exhaust turbocharger 7, while the inlet of the compressor 7a is connected through an input air amount detector 8 to an air cleaner 9. Inside the intake duct 6, a throttle valve 10 driven by a step motor is arranged. Furthermore, around the intake duct 6 is arranged a cooling device 11 for cooling the intake air flowing into the intake duct 6. In the embodiment shown in FIG. 1, engine coolant water is guided into the cooling device 11 where the engine coolant water is used to cool the intake air.
[0017]On the other hand, the exhaust manifold 5 is connected to the inl...
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Abstract
In an internal combustion engine, an NOx selective reduction catalyst (15) is arranged in the engine exhaust passage, and the amount of deposition of the HC deposited at the NOx selective reduction catalyst (15) is estimated. When the estimated HC deposition amount exceeds a predetermined allowable deposition amount, the NOx selective reduction catalyst (15) is raised in temperature to make the deposited HC desorb from the NOx selective reduction catalyst (15), and thereby the NOx selective reduction catalyst (15) from HC poisoning is restored.
Description
TECHNICAL FIELD[0001]The present invention relates to an exhaust purification device of an internal combustion engine.BACKGROUND ART[0002]Known in the art is an internal combustion engine arranging an NOx selective reduction catalyst in an engine exhaust passage, arranging an oxidation catalyst inside an engine exhaust passage upstream of the NOx selective reduction catalyst, feeding urea to the NOx selective reduction catalyst, and using ammonia generated from the urea to selectively reduce the NOx contained in the exhaust gas (for example, see Japanese Patent Publication (A) No. 2005-23921). In this internal combustion engine, the NOx selective reduction catalyst adsorbs the ammonia, and the adsorbed ammonia reacts with the NOx contained in the exhaust gas whereby the NOx is reduced.[0003]In this regard, in this internal combustion engine, usually the majority of the HC exhausted from the engine is oxidized in the oxidation catalyst, but part of the HC flows into the NOx selective...
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IPC IPC(8): F01N9/00F01N3/035F01N3/10
CPCB01D53/9418F01N13/009B01D53/9495B01D2251/208F01N3/035F01N3/106F01N3/2033F01N3/2066F01N2560/023F01N2610/02F01N2610/03F02B37/00Y02T10/26Y02T10/24F01N13/0097B01D53/944Y02T10/12
Inventor TOSHIOKA, SHUNSUKEODA, TOMIHISATANAI, YUTAKAASAURA, SHINYA
Owner TOYOTA JIDOSHA KK