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Injector for metering reducing agent to the exhaust gas of an internal combustion engine

A technology for injectors and internal combustion engines, applied in the direction of internal combustion piston engines, combustion engines, machines/engines, etc., can solve the problems of sediment shedding, component damage, exhaust gas flow away, etc., and achieve the effect of small residual gap

Active Publication Date: 2014-01-29
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deposits can impair the functionality of the injector, e.g. by affecting the formation of the spray
Furthermore, it is possible for said deposits to be dislodged and carried away by the exhaust gas flow
In this case, downstream components of the exhaust system may be damaged

Method used

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  • Injector for metering reducing agent to the exhaust gas of an internal combustion engine
  • Injector for metering reducing agent to the exhaust gas of an internal combustion engine
  • Injector for metering reducing agent to the exhaust gas of an internal combustion engine

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Embodiment Construction

[0024] internal combustion engine in figure 1 is shown symbolically in and denoted by reference numeral 10 . The hot exhaust gas is supplied to the SCR catalytic converter 14 via the exhaust pipe 12 . Upstream of the SCR catalytic converter 14 , a support 16 is integrally formed on the exhaust pipe 12 , to which an SCR injection device (referred to below as injector 18 ) is fastened with a flange 20 . A liquid reductant 24, usually stored in a tank 26 in the form of an aqueous urea solution, is supplied to the injector 18 by a delivery module 22 comprising a pump and valve arrangement.

[0025] If the internal combustion engine 10 is running, the reducing agent 24 is sprayed by the injector 18 in the form of small droplets into the hot exhaust gas flowing in the exhaust pipe 12, reacts with the urea with ammonia, and then passes through the SCR catalyst 14 with the Nitric oxide and nitric oxide are selectively catalytically reduced to nitrogen and water in molecular form.

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Abstract

The invention relates to an injector (18) for metering reducing agent (24) to the exhaust gas of an internal combustion engine (10), having a heat sink (45) enclosed by a heat shield (56), wherein according to the invention a contact surface between the heat shield (56) and the heat sink (45) is minimized.

Description

technical field [0001] The invention relates to an injector for metering reducing agent into the exhaust gas of an internal combustion engine. Background technique [0002] It is known that the nitrogen oxide content in the exhaust gas of internal combustion engines can be reduced by selective catalytic reduction (SCR). To this end, the exhaust gas is supplied with directly reducing substances, such as ammonia water or raw products, firstly reducing substances are released in the exhaust gas. As a primary product, for example, an aqueous urea solution can be used. In selective catalytic reduction, ammonia and nitric oxide are converted into nitrogen and water in molecular form. The selective catalytic reduction occurs in an SCR catalytic reductant. [0003] The reducing agent, for example an aqueous urea solution, is introduced into the exhaust gas via electrically controllable injectors. It also includes fixing means by means of which the injector is fixed on the flange...

Claims

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Application Information

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IPC IPC(8): F01N3/20
CPCF01N3/2066F01N2610/1453Y02T10/24F01N2260/024F01N2610/11F01N2610/02Y02T10/12
Inventor M·基翁特克U·迈因加斯特
Owner ROBERT BOSCH GMBH