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Exhaust system structure for internal combustion engine

A technology for exhaust systems and internal combustion engines, applied to internal combustion piston engines, exhaust devices, exhaust treatment, etc., to achieve the effect of reducing the deposition of urea

Inactive Publication Date: 2016-09-14
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the aqueous urea solution thus added through the adding device may adhere to the inner surface of the exhaust pipe

Method used

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  • Exhaust system structure for internal combustion engine
  • Exhaust system structure for internal combustion engine
  • Exhaust system structure for internal combustion engine

Examples

Experimental program
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Embodiment 1

[0054] First, refer to Figure 1 to Figure 6 A first embodiment of the present invention will be described. figure 1 is a schematic diagram showing the structure of an exhaust system for an internal combustion engine according to the present invention.

[0055] figure 1 The internal combustion engine 1 shown is a compression ignition internal combustion engine 1 (diesel engine) with a plurality of cylinders. The internal combustion engine 1 may be a spark ignition internal combustion engine (gasoline engine) operating in a lean state.

[0056] The internal combustion engine 1 is connected to an exhaust manifold 3 . The exhaust manifold 3 includes a plurality of branch pipes through which burned gas (exhaust gas) is discharged from the cylinders 2 of the internal combustion engine 1 , and a merging portion where the branch pipes merge.

[0057] The junction of the exhaust manifold 3 is connected to the inlet of a turbine housing 40 which is part of the turbocharger 4 . The...

Embodiment 2

[0076] Below, will refer to Figure 7 to Figure 9 A second embodiment of the present invention will be described. Hereinafter, features different from those in the first embodiment will be described, and similar features will not be described.

[0077] In the first embodiment, the case has been described where the heat receiving portion is provided on the portion of the exhaust pipe 5 that the urea aqueous solution injected through the addition valve 8 impacts. In this embodiment, the case where the heat storage portion is provided on the impact portion will be described.

[0078] Figure 7 is a schematic diagram showing the structure of an exhaust system for an internal combustion engine in this embodiment. exist Figure 7 In , the same components as those in the first embodiment described above are marked by the same reference numerals. exist Figure 7 In the illustrated exhaust system configuration, the heat storage unit 52 is provided on a portion of the exhaust pipe 5...

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Abstract

An object of the invention is to prevent or reduce deposition of urea by a simple measure in an exhaust system structure equipped with an addition device that adds aqueous urea solution to exhaust gas. An exhaust system structure for an internal combustion engine according to the invention includes an exhaust pipe connected to the internal combustion engine and an addition device located midway in said exhaust pipe to add aqueous urea solution to exhaust gas flowing in said exhaust pipe. The outer wall of a portion of the exhaust pipe on which aqueous urea solution added by the addition device impinges is in contact with the outer wall of a component of the exhaust system arranged upstream of the aforementioned portion so that the temperature of the aforementioned portion is raised.

Description

technical field [0001] The present invention relates to an exhaust system structure for an internal combustion engine, and more particularly, to an exhaust system structure equipped with an addition device for adding an aqueous urea solution or the like to exhaust gas. Background technique [0002] There is known an exhaust system structure for an internal combustion engine, which has an SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) catalyst and an addition device for adding an aqueous urea solution to the exhaust gas upstream of the SCR catalyst, both of which are attached Connect to exhaust pipe. In this exhaust system structure, there is a possibility that the aqueous urea solution added by the adding device may adhere to the inner surface of the exhaust pipe. [0003] Especially in recent years, the SCR catalyst tends to be arranged at an upstream position in the exhaust system for the purpose of improving the exhaust purification rate of the SCR ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20
CPCF01N3/2066F01N2240/10F01N2610/102F01N2610/02F02B37/00Y02T10/12F01N3/2882
Inventor 佐藤正明浅浦慎也
Owner TOYOTA JIDOSHA KK
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