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Exhaust purification device for 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: 2014-01-01
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] but exists if NO X When the storage catalyst becomes high temperature, NO X The problem of decreased purification rate

Method used

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  • Exhaust purification device for internal combustion engine
  • Exhaust purification device for internal combustion engine
  • Exhaust purification device for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] figure 1 An overall view of a compression ignition internal combustion engine is shown.

[0046] refer to figure 1 , 1 represents the main body of the internal combustion engine, 2 represents the combustion chamber of each cylinder, 3 represents the electronically controlled fuel injection valve for injecting fuel into each combustion chamber 2, 4 represents the intake manifold, and 5 represents the exhaust manifold. The intake manifold 4 is connected to an outlet of a compressor 7 a of an exhaust turbocharger 7 via an intake duct 6 , and an inlet of the compressor 7 a is connected to an air filter 9 via an intake air amount detector 8 . A throttle valve 10 driven by a stepping motor is disposed in the intake duct 6 , and a cooling device 11 for cooling the intake air flowing in the intake duct 6 is also disposed around the intake duct 6 . exist figure 1 In the exemplary embodiment shown, the engine cooling water is led into the cooling device 11 and the intake air i...

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Abstract

In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. At the time of engine operation, the amplitude of change of the concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to become within a predetermined range of amplitude by control of at least one of the injection time and injection pressure of hydrocarbons from the hydrocarbon feed valve (15). In this case, when only the injection time of hydrocarbons is controlled, the injection time of hydrocarbons under the same engine operating state is made longer the higher the temperature of the exhaust purification catalyst (13).

Description

technical field [0001] The present invention relates to an exhaust purification device for an internal combustion engine. Background technique [0002] There is known an internal combustion engine (for example, refer to Patent Document 1), in which NO X A storage catalyst that stores NO contained in exhaust gas when the air-fuel ratio of the inflowing exhaust gas is lean X , and release the occluded NO when the air-fuel ratio of the inflowing exhaust gas is a rich air-fuel ratio X , in NO X An oxidation catalyst with adsorption function is arranged in the exhaust passage of the internal combustion engine upstream of the storage catalyst. 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 is a rich air-fuel ratio. [0003] In this internal combustion engine, when goi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/08F01N3/02
CPCF01N2610/03F01N2900/1602F01N2900/1808F01N2900/0601B01D53/9495F01N2900/08Y02T10/24F01N13/02F01N3/208F01N2900/1812F01N2900/1402B01D53/9431F01N3/0814F01N3/0871F01N2900/0422F01N13/009Y02T10/12
Inventor 井上三树男吉田耕平美才治悠树梅本寿丈
Owner TOYOTA JIDOSHA KK