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SCR (Selective Catalytic Reduction) control method and device

A control method and target technology, applied in the direction of electronic control of mufflers, exhaust devices, exhaust treatment devices, etc., can solve the problem of ammonia leakage emission standards that cannot meet the NOx emission requirements, and the urea injection amount that cannot be accurately calculated by SCR And other issues

Active Publication Date: 2021-01-19
SAIC MOTOR
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Problems solved by technology

[0005] In view of this, the embodiment of the present application provides an SCR control method and device to solve the problem that the urea injection volume of the SCR cannot be accurately calculated in the prior art, thereby failing to meet the NOx emission requirements and ammonia leakage emission requirements of heavy-duty national VI diesel engines. standard technical questions

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  • SCR (Selective Catalytic Reduction) control method and device
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  • SCR (Selective Catalytic Reduction) control method and device

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Embodiment Construction

[0054]The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0055] In order to facilitate the understanding of the technical solution provided by the present application, a brief description of the research background of the technical solution of the present application is given below.

[0056] In order to adapt to the rapid development of society, automobiles and other vehicles powered by internal combustion engines are widely used by people. But while these means of transport provide people with fast travel conditions, their disadvantages a...

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Abstract

The embodiment of the invention discloses an SCR (Selective Catalytic Reduction) control method and device. The method comprises the following steps: firstly, obtaining the upstream NOx mass flow of target SCR; secondly, calculating the ammonia nitrogen ratio, the NOx conversion efficiency, the NH3 storage or desorption rate and the closed-loop correction coefficient corresponding to the target SCR; and finally determining the urea injection amount of the target SCR according to the upstream NOx mass flow, the ammonia nitrogen ratio, the NOx conversion efficiency, the NH3 storage or desorptionrate and the closed-loop correction coefficient of the target SCR. According to the method, after the upstream NOx mass flow of the target SCR is obtained, closed-loop control treatment is not directly performed after simply converting the upstream NOx mass flow into required NH3, but the ammonia nitrogen ratio, the NOx conversion efficiency and the NH3 storage or desorption rate are firstly utilized to treat the upstream NOx mass flow, and then the closed-loop correction coefficient is utilized for further treatment, so that the urea injection amount can be more accurately determined and used for reacting ammonia with NOx, and the NOx emission amount and the ammonia leakage amount can meet the national VI emission regulations of heavy-duty diesel engines.

Description

technical field [0001] The present application relates to the technical field of engines, in particular to a control method and device for an SCR (Selective Catalytic Reduction, selective catalytic reduction system). Background technique [0002] With the rapid development of the economy and the acceleration of urbanization, the utilization rate of automobiles is getting higher and higher. However, while these vehicles provide people with fast travel conditions, their disadvantages are gradually emerging. Among them, exhaust gas emission is a very important issue, which seriously affects people's health. Therefore, it is necessary to strengthen the control of NOx emissions from internal combustion engines. [0003] At present, the SCR system in the post-treatment system is mostly used to control the emission of NOx gas. The principle is to inject urea into the exhaust gas discharged from the engine, use the urea to decompose to produce ammonia, and react with the ammonia an...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/2066F01N3/208F01N9/005F01N2610/02Y02T10/12Y02T10/40
Inventor 曹璐李栋高祥尚明高波张新宇
Owner SAIC MOTOR
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