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Exhaust emission purifier of internal combustion engin

An exhaust purification device and internal combustion engine technology, which is applied in the direction of exhaust device, electronic control of exhaust gas treatment device, internal combustion piston engine, etc., can solve the problems of insufficient and insufficient oxidation reaction, complex structure, etc.

Active Publication Date: 2014-06-11
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of oxygen contained in the exhaust gas becomes insufficient relative to the amount required to oxidize the substance to be oxidized
Therefore, there is a problem that the oxidation reaction of the substance to be oxidized cannot be sufficiently generated in the oxidation catalyst, and the substance to be oxidized is released into the atmosphere through the oxidation catalyst.
[0010] The device disclosed in the above-mentioned Japanese Patent Laid-Open No. 2004-92431 has the following problems: two internal combustion engine exhaust passages must be formed side by side, and in addition, NO must be arranged in each passage. x Catalyst occlusion, fuel dosing and isolation valves, resulting in complex structures

Method used

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  • Exhaust emission purifier of internal combustion engin
  • Exhaust emission purifier of internal combustion engin
  • Exhaust emission purifier of internal combustion engin

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Experimental program
Comparison scheme
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Embodiment approach 1

[0037] refer to Figure 1 to Figure 11 An exhaust gas purification apparatus for an internal combustion engine according to Embodiment 1 will be described.

[0038] figure 1 A general view of the internal combustion engine of the present embodiment is shown in FIG. In the present embodiment, a compression ignition type diesel engine will be described as an example. The internal combustion engine includes an internal combustion engine main body 1 . The internal combustion engine body 1 includes a combustion chamber 2 of each cylinder, an electronically controlled fuel injection valve 3 for injecting fuel into each of the combustion chambers 2 , an intake manifold 4 , and an exhaust manifold 5 .

[0039] The internal combustion engine of the present embodiment includes an exhaust turbocharger 7 as a supercharger. The intake manifold 4 is connected to the outlet of the compressor 7 a of the exhaust turbocharger 7 via the suction pipe duct 6 . The inlet of the compressor 7a i...

Embodiment approach 2

[0100] refer to Figure 12 and Figure 13 An exhaust purification system for an internal combustion engine according to Embodiment 2 will be described. The exhaust purification device of the present embodiment includes a flow path changing device having a function of adjusting the flow rate of exhaust gas.

[0101] Figure 12 is an enlarged schematic cross-sectional view of the exhaust pipe and the tank of the exhaust gas purification device of the present embodiment. The exhaust purification device of the present embodiment includes an on-off valve 52 . The on-off valve 52 of this embodiment is a butterfly valve and is formed rotatably. The on-off valve 52 is formed as a plate-shaped member capable of stopping at any angle. The opening and closing valve 52 is formed so that an opening degree can be adjusted. The on-off valve 52 is formed to be able to adjust the flow rate of the exhaust gas toward the oxidation catalyst 17 .

[0102] In the first operation control of t...

Embodiment approach 3

[0116] refer to Figure 14 and Figure 15 An exhaust gas purification apparatus for an internal combustion engine according to Embodiment 3 will be described. The exhaust gas purification apparatus of the internal combustion engine of the present embodiment includes a supercharger.

[0117] Figure 14 It is a timing chart of the 1st operation control of this embodiment. In the first operation control, when the opening degree of the throttle valve decreases and the rotational speed of the internal combustion engine decreases, fuel is supplied to the engine exhaust passage to perform NO. x NO storage reduction catalyst x release.

[0118] Until time t1, the accelerator pedal 40 is depressed by a predetermined amount (see figure 1 ). The throttle valve 10 is opened by a predetermined opening degree, and the internal combustion engine outputs a predetermined torque. At time t1, the accelerator pedal 40 returns to the original position and starts to decelerate. The opening...

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PUM

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Abstract

An exhaust purification system of an internal combustion engine provided with an NO X storage reduction catalyst 16, an oxidation catalyst 17 which is arranged downstream of the NO X storage reduction catalyst 16, an exhaust gas tank 51 which is connected to the engine exhaust passage between the NO X storage reduction catalyst 16 and the oxidation catalyst 17, and a switching valve 52 which closes the engine exhaust passage toward the oxidation catalyst 17 and makes the exhaust gas flow into the tank 51. When making the air-fuel ratio of the exhaust gas which flows into the NO X storage reduction catalyst 16 rich, the engine exhaust passage toward the oxidation catalyst 16 is shut and the flow path is switched so that the exhaust gas flows to the tank 51 to thereby store the exhaust gas in the tank 51.

Description

technical field [0001] The present invention relates to an exhaust gas purification device of an internal combustion engine. Background technique [0002] In addition to carbon monoxide (CO), unburned hydrocarbons (HC), or particulates (PM), the exhaust gas of an internal combustion engine such as a diesel engine also contains nitrogen oxides (NO). x ). As one of the methods for removing nitrogen oxides, it is known to arrange NOx in the exhaust passage of an internal combustion engine. x A method of reducing an exhaust gas treatment device. [0003] to NO x The device that performs the reduction contains temporarily occluded NO x NO x occlusion reduction catalyst. When the air-fuel ratio of exhaust gas is large, that is, when the air-fuel ratio of exhaust gas is lean, NO x The occlusion reduction catalyst occludes NO x . On the other hand, when the air-fuel ratio of the exhaust gas is small, that is, when the air-fuel ratio of the exhaust gas is the stoichiometric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/24F01N3/20F01N3/28
CPCF01N3/0871F01N3/0842F01N13/009Y02T10/47F01N9/00F01N3/0814F01N3/103F01N2240/36F01N2240/26Y02T10/40
Inventor 井上三树男
Owner TOYOTA JIDOSHA KK