Urea injection control method for SCR (selective catalytic reduction) system

A technology of SCR system and urea injection, which is applied in the direction of electronic control, exhaust treatment, mechanical equipment, etc. of exhaust gas treatment devices, which can solve the problems of urea ammonia leakage, failure to position in time, SCRHC poisoning, etc.

Active Publication Date: 2021-11-16
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above, the present invention aims to provide a method for controlling urea injection in an SCR system, which solves the problem of SCR HC poisoning and triggers regeneration. Faile

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  • Urea injection control method for SCR (selective catalytic reduction) system

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Embodiment Construction

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0025] The present invention proposes an embodiment of an SCR system urea injection control method, specifically, as figure 1 As shown, can include:

[0026] Step S1, during the operation of the vehicle, continuously monitor the exhaust gas temperature and the ambient temperature;

[0027] Step S2, when it is detected that the vehicle has been in a low exhaust gas temperature condition for a preset period of time, and the ambient temperature meets the preset temperature threshold, control the urea injection mechanism (such as...

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Abstract

The invention discloses a urea injection control method for an SCR (Selective Catalytic Reduction) system. The urea injection control method has the conception that after a urea injection mechanism of the SCR system is started by a vehicle, if the current actual conversion efficiency is lower than the set target conversion efficiency, correction coefficient fac post-nitrogen oxygen is increased until regeneration operation is triggered, and the nitrogen and oxygen after the correction coefficient fac are forcibly reset; for example, the correction coefficient fac post-nitrogen oxygen can be reset initial value can be reset to an initial value 1 or other correction factors are adopted to correct the correction coefficient fac post-nitrogen oxygen, so that the fac post-nitrogen oxygen is set to be other set values, and the current urea injection amount is regulated and controlled in time; and therefore, the urea injection amount can be synchronously recovered to be a normal injection value after the efficiency of the SCR system is recovered to be normal through regeneration, and the problems of reduction of the reefficiency and crystallization of the SCR system caused by excessive injection of urea can be solved.

Description

technical field [0001] The invention relates to the technical field of selective reduction, in particular to a method for controlling urea injection in an SCR system. Background technique [0002] Selective Reduction Technology (SCR) is one of the important post-treatment technologies for reducing NOx emissions of National VI heavy-duty diesel vehicles. Its working principle is to inject a certain volume of urea solution into the exhaust pipe, and the urea solution is under the action of the mixer and exhaust Atomized hydrolysis generates ammonia gas, which is mixed with exhaust gas, and under the action of the reduction catalyst, nitrogen oxides are reduced to water and nitrogen gas, achieving the purpose of purifying exhaust gas. [0003] At present, the SCR system of National VI heavy-duty diesel vehicles includes urea pump, urea nozzle, urea connection pipeline, urea injection controller, SCR catalyst assembly, exhaust temperature, front and rear nitrogen oxide sensors, ...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/208F01N9/00F01N2610/02F01N2610/146Y02A50/20Y02T10/12Y02T10/40
Inventor 蒋茂玎胡帅钟秋月张杨杨王光远李杰
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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