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Ammonia and urea dual injection system and control method thereof

A technology of injection system and urea nozzle, which is applied in the direction of electronic control, exhaust treatment, and exhaust device of exhaust gas treatment device, can solve the problems of crystal blockage and low conversion efficiency, and achieve the effect of solving the inconvenience of popularization and use.

Pending Publication Date: 2018-07-20
CHINA FIRST AUTOMOBILE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide an ammonia urea dual injection system and its control method, through which the ammonia urea dual injection system can completely solve the problems of low exhaust temperature, low conversion efficiency under cold start conditions, and easy crystallization blockage of the National VI urea system question

Method used

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  • Ammonia and urea dual injection system and control method thereof

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Embodiment 1

[0030] This embodiment provides an ammonia urea dual injection system, which includes a urea tank 1, a urea pump 2, a urea nozzle 3, an ammonia storage tank 4, an ammonia metering valve 5, an ammonia nozzle 6, an ECU 7, and a post-processor 8. Exhaust temperature sensor 9, ambient temperature sensor 10, urea temperature sensor 11, urea heating water valve 12, urea liquid level sensor 13 and ammonia storage tank heater 14.

[0031] The urea tank 1 stores standard urea solution for vehicles, and the urea pump 2 pumps the urea solution to the urea nozzle 3, and the ECU 7 controls the urea nozzle 3 to spray the atomized urea solution into the post-processor 8 for reaction.

[0032] That is, the inlet of the urea pump 2 communicates with the urea tank 1, the outlet of the urea pump is connected to the urea nozzle 3, and the urea nozzle 3 is installed on the post-processor 8 for backward The urea solution is sprayed in the processor 8 .

[0033] The ammonia storage tank 4 stores li...

Embodiment 2

[0040] This embodiment provides a control method for an ammonia urea dual-injection system, including:

[0041] S10. Detect the temperature of the gas inside the afterprocessor 8 through the exhaust temperature sensor 7. When the temperature of the gas inside the afterprocessor 8 is lower than a certain threshold (200° C.), the ECU 7 controls the ammonia storage tank heater 14 to turn on the The ammonia storage tank 4 is heated and controls the ammonia gas metering valve 5 to measure and inject ammonia gas.

[0042] When the vehicle is cold started, the temperature in the afterprocessor 8 is relatively low. At this time, if urea is sprayed, crystallization and low conversion efficiency are likely to occur. The ammonia gas metering valve 5 is controlled by the ECU 7 to inject the ammonia gas, and the nitrogen oxide emission of the diesel vehicle can be reduced by the ammonia gas.

[0043] S20. When the temperature of the urea solution stored in the urea tank 1 is higher than -...

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Abstract

The invention discloses an ammonia and urea dual injection system. The ammonia and urea dual injection system comprises a urea box, a urea pump, a urea nozzle, an ammonia storage tank, an ammonia metering valve, an ammonia nozzle, an ECU (Electronic Control Unit) and a postprocessor. According to the ammonia and urea dual injection system, urea injection is focused, ammonia injection is performedonly in special working conditions of cold start, low exhaust temperature, urea icing or superhigh SCR conversion efficiency, and the problems of low exhaust temperature, low conversion efficiency inthe working condition of cold start and easiness in crystallization and blockage of a national VI urea system can be solved; the problems of unfreezing first and having no capability of quickly discharging when the national VI urea injection system is operated in a cold area are solved; the problem of difficulty in implementation of 99% of the national VI SCR conversion efficiency can be solved; and the problem of inconvenience in popularization and use of the ammonia injection system is solved.

Description

technical field [0001] The invention relates to an ammonia gas urea double injection system and a control method thereof. It is used in the field of aftertreatment of diesel engine exhaust. Background technique [0002] With the implementation of the National IV emission regulations for commercial vehicles, the vehicle must be equipped with a nitrogen oxide (NOx) emission treatment device. [0003] China's medium and heavy-duty diesel engines generally adopt the selective catalytic reduction (SCR) technology route, that is, the standard vehicle urea aqueous solution is injected into the exhaust, and the ammonia gas generated by its decomposition is used for selective catalytic reduction of NOx to generate harmless nitrogen and water. . [0004] The country announced that it will implement the National VI emission regulations in 2020, and the NOx emission limit value will be greatly reduced. At the same time, strict regulations have been imposed on NOx emissions under cold ...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N3/28F01N9/00F01N11/00
CPCF01N3/208F01N3/28F01N9/00F01N11/002F01N2900/1404F01N2610/146F01N2610/1486F01N2610/02Y02A50/20Y02T10/12Y02T10/40
Inventor 贾昭远邢喜春戈非朱宏志尹燕升
Owner CHINA FIRST AUTOMOBILE
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