Device for introducing a liquid substance into the exhaust gas of an internal combustion engine
a technology of liquid substance and internal combustion engine, which is applied in the direction of exhaust treatment, engine components, mechanical apparatus, etc., can solve the problems of longer service life, achieve the effect of reducing unwanted heating of injection devices, reducing heat input into contact elements, and reducing heat transfer regionally
Inactive Publication Date: 2009-09-03
HAEBERER RAINER +1
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Benefits of technology
"The present invention is about improving a device for introducing a liquid substance into the exhaust gas of an internal combustion engine. The invention aims to achieve high precision in metering the liquid substance and to improve the service life of the device. The invention provides a device with a contact element that can be easily deformed and has excellent thermal conductivity, allowing for good thermal contact between the injection device and the retaining device. The device also includes a cooling conduit for efficient cooling. The invention also suggests the use of a thermal insulation means and an intermediate air gap to reduce heat input and prevent unwanted heating of the injection device. Overall, the invention helps to control heat transfer between the cooled retaining device and the injection device, leading to improved performance and durability of the device."
Problems solved by technology
The targeted and possibly even regional variation of the temperature of the injection device relieves the injection device, which leads to a longer service life.
Method used
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[0018]In FIG. 1, an internal combustion engine is identified overall by reference numeral 10. It includes combustion chambers 12, in which a fuel-air mixture is combusted. Hot combustion gases are removed from the combustion chambers 12 through an exhaust gas conduit 14. In it, there is an exhaust gas posttreatment system, in the form of an SCR catalytic converter 16. SCR stands for “Selective Catalytic Reduction”. In the SCR catalytic converter 16, the pollutant NOx is reduced, with the aid of liquid reducing agent, to N2 and H2O. An oxidation catalytic converter is typically located upstream of the SCR catalytic converter but is not shown in FIG. 1 for the sake of simplicity. Ammonia may be used as the reducing agent. For the sake of ease of handling, the ammonia is not metered into the exhaust gas in pure form but rather in the form of a precursor product. A urea-water solution can be considered in particular as the precursor product.
[0019]The engine 10 also includes a device 18,...
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Abstract
A device for introducing a liquid reducing agent into the exhaust gas of an internal combustion engine includes an injection device and a retaining device. By means of the latter, the injection device is retained at least indirectly in the vicinity of an exhaust gas conduit and a cooling device cools the retaining device. An intermediate portion is disposed between the retaining device and the injection device, and this portion at least regionally influences the heat flow between the injection device and the retaining device.
Description
[0001]The invention relates to a device for introducing a liquid substance into the exhaust gas of an internal combustion engine as generically defined by the preamble to claim 1. The subject of the invention is also a method for producing such a device.[0002]German Patent Disclosure DE 103 24 482 A1 describes a device for injecting a liquid reducing agent into the exhaust gas of an internal combustion engine. To that end, the reducing agent is pumped from a storage container into a hollow retaining device, and from there back to the fuel tank. Via a branch fluidically downstream of the retaining device, reducing agent can be delivered to an injection device, which is retained by the retaining device. Because of the flow of reducing agent through the retaining device, the retaining device is cooled; that is, the retaining device includes a cooling device.DISCLOSURE OF THE INVENTION[0003]The object of the present invention is to refine a device for introducing a liquid substance into...
Claims
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IPC IPC(8): F01N3/00F01N5/02
CPCB01D53/90B01D2251/2067F01N3/2066Y02T10/24F01N2610/11F01N2610/1453F01N2260/024Y02T10/12
Inventor HAEBERER, RAINERHORN, MATTHIAS
Owner HAEBERER RAINER