Method and device for detecting urea crystallization of SCR (Selective Catalytic Reduction) system

A technology of SCR system and urea, applied in the direction of exhaust device, muffler device, exhaust treatment device, etc., can solve the problems of insufficient decomposition, affecting the consistency of NOx emission and conversion efficiency, uneven mixing, etc., to achieve Eliminates the effect of urea crystallization

Active Publication Date: 2022-03-25
WEICHAI POWER CO LTD
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  • Claims
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Problems solved by technology

During the operation of the vehicle, due to poor atomization of urea, uneven mixing or insufficient decomposition, the sprayed urea droplets cannot be converted into NH3 in real time, but by-products are generated, resulting in unstable reduction reactions, thus affecting the consistency of NOx emissions and conversion efficiency

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  • Method and device for detecting urea crystallization of SCR (Selective Catalytic Reduction) system
  • Method and device for detecting urea crystallization of SCR (Selective Catalytic Reduction) system
  • Method and device for detecting urea crystallization of SCR (Selective Catalytic Reduction) system

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Embodiment Construction

[0039] In order to help better understand the solutions provided in the embodiments of the present application, before introducing the methods provided in the embodiments of the present application, first introduce the application scenarios of the solutions in the embodiments of the present application.

[0040] see figure 1 , which is a schematic diagram of the urea SCR system provided by the present application.

[0041] As can be seen from the figure, it includes a urea tank 100, a urea supply unit, an engine ECU, a sensor ECU, a urea injection pump and an SCR.

[0042] Since the duration of urea crystallization is different under different working conditions, it is necessary to test the duration of urea crystallization under each operating condition in advance. This application obtains the urea injection amount under all working conditions through the universal characteristic data of the engine, and obtains the duration of urea crystallization under the injection amount b...

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Abstract

The invention discloses a method for detecting urea crystallization of an SCR (Selective Catalytic Reduction) system, which comprises the following steps: respectively obtaining urea injection quantity of the SCR system under each operation condition when an engine is under different operation conditions; different operation conditions correspond to different rotating speeds and torques; determining the duration of crystallization of the urea according to the urea injection amount; according to the duration of crystallization of urea under each operation condition, whether diesel particulate filter (DPF) regeneration needs to be triggered during actual operation of the engine is determined, DPF regeneration is used for eliminating urea crystallization, whether urea crystallization occurs or not can be accurately judged, and when urea crystallization occurs, DPF regeneration is triggered, so that urea crystallization is eliminated.

Description

technical field [0001] The present application relates to the technical field of tail gas emission, in particular to a method and device for detecting urea crystallization in an SCR system. Background technique [0002] In recent years, the basic principle of Selective Catalytic Reduction (SCR, Selective Catalytic Reduction) technology is to inject fuel or add other reducing agents to the exhaust gas, select a suitable catalyst, promote the reaction between the reducing agent and NOx, and at the same time inhibit the reducing agent from being exhausted. Oxygen oxidation in. According to the type of reducing agent, the existing SCR technology can be divided into two types: urea SCR technology using NH3 produced by urea decomposition as reducing agent and hydrocarbon SCR technology using hydrocarbon as reducing agent. At present, the hydrocarbon SCR technology is still under further research, and there are not many practical applications; while the urea SCR technology is rela...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N9/00
CPCF01N11/00F01N9/002F01N2550/00Y02T10/40Y02T10/12
Inventor 张素英许雪利薛裕丹王建东
Owner WEICHAI POWER CO LTD
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