Measurement system for spraying urea liquid into exhaust flow in combustion engine

A technology of metering system and exhaust gas flow, applied in the field of metering system of selective catalytic reduction, can solve the problem of high fuel consumption of the engine

Active Publication Date: 2009-06-17
ALBONAIR GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the disadvantage here is that the consequence of the continuous air consumption of the metering system is a higher fuel consumption of the engine
The same disadvantage is that the air supply has to be adapted to an additional consumer in the form of a urea metering system
A particular disadvantage here is that compressors with increased performance have to be used multiple times

Method used

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  • Measurement system for spraying urea liquid into exhaust flow in combustion engine
  • Measurement system for spraying urea liquid into exhaust flow in combustion engine

Examples

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Embodiment Construction

[0044] The same components and assemblies are shown with the same reference numbers in the figures. Figure 1 shows a schematic diagram of a first embodiment of a urea metering system.

[0045] The urea is sucked by the metering pump 3 from the tank 1 through the suction pipe 2 . The metering pump 3 is, for example, a diaphragm pump or a piston pump, which delivers a certain amount of urea solution with each stroke and thus likewise metered. The urea is delivered to the double-material nozzle 5 through the pressure pipe 4 . The dual-substance nozzle 5 is preferably an external mixing nozzle in which the air jet atomizes the urea.

[0046] Compressed air is delivered from the compressed air container 6 to the proportional air valve 7 . The proportional air valve 7 regulates the pressure flow to a value predetermined by the electronics 12 . The input parameters for calculating the values ​​by means of the electronic control unit 12 are engine data, such as the exhaust gas mas...

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Abstract

The invention relates to a measurement system capable of spraying urea solution into exhaust flow (9) of combustion engine for selective catalytic reduction and a control method thereof. The measurement system is connected with a urea solution box (1) to taka out urea solution and the measurement system is also connected with a compressed air supplying device (6) wherein the measurement system comprises at least one nozzle (5) for spraying the urea solution into the exhaust flow in aid of compressed air. The measurement system comprises an air valve (7) to adjust the pressure and/or air amount and/or valve starting time of the compressed air supplying device (6) and a sensor for measuring the pressure and/or air amount in the compressed air supplying device (6) is set between the air valve (7) and the nozzle (5).

Description

technical field [0001] The invention relates to a metering system for injecting urea solution into the exhaust gas flow of an internal combustion engine for selective catalytic reduction, wherein the metering system can be connected to a urea solution tank from which the urea solution can be withdrawn, Furthermore, the metering system can be connected to a compressed air supply, wherein the metering system has at least one nozzle through which the urea solution can be sprayed into the exhaust gas flow by means of compressed air. Furthermore, the invention relates to a method for controlling the injection of a urea solution into the exhaust gas flow of an internal combustion engine by means of compressed air for selective catalytic reduction. Background technique [0002] The SCR catalyst is used to reduce the nitrogen oxide emission of the diesel engine. For this purpose, the reducing agent is injected into the exhaust system with a metering device. Ammonia is used as redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/08F01N3/18B01D53/86B01D53/94
CPCF01N2610/08F01N3/2066F01N2610/1453Y02T10/24F01N2610/1473F01N2610/14F01N2610/02Y02T10/12F01N3/208F01N2560/06F01N2610/085F01N2610/146F01N2610/148F01N2900/1824
Inventor G·许特沃尔
Owner ALBONAIR GMBH
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