A kind of scr control method and device
A technology of conversion efficiency and theory, applied in the direction of muffler device, exhaust device, electronic control of exhaust gas treatment device, etc., can solve problems such as high urea injection amount, inability to accurately convert engine catalyst conversion efficiency, urea ammonia leakage, etc.
Active Publication Date: 2017-05-10
WEICHAI POWER CO LTD
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Problems solved by technology
[0006] Since the conversion efficiency of the catalyst is also related to factors such as exhaust temperature and exhaust flow rate, the conversion efficiency of the catalyst under the current working condition of the engine cannot be accurately determined only by the above method, and there may be a theory that the determined conversion efficiency of the catalyst is higher than that of the catalyst under the current working condition Maximum conversion efficiency, so that the calculated urea injection is higher than the actual urea demand, resulting in excess injected urea forming ammonia slip
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[0034] The core of the present invention is to provide an SCR control method and device, which can avoid excessive injection of urea under various operating conditions of the engine and reduce the risk of ammonia leakage.
[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0036] In order to facilitate understanding and concise description, the following description is combined with the SCR control method and device, and the beneficial effects will not be repeated.
[0037] Please refer to Figure 1-2 , figure 1 Is a flowchart of the first embodiment of the SCR control method provided by the present invention; figure 2 for figure 1 The schematic diagram of the control principle of the SCR control method shown.
[0038] In this embodiment, the SCR control method includes the following steps: ...
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The invention discloses an SCR (Selective Catalytic Reduction) control method and an SCR (Selective Catalytic Reduction) control device. The method includes the steps of: obtaining a target conversion efficiency of a catalyst under the current working condition of an engine; obtaining the theoretical maximal conversion efficiency of the catalyst under the current working condition of the engine; comparing the target conversion efficiency with the theoretical maximal conversion efficiency, and selecting the smaller one as the final target conversion efficiency; determining the injection quantity of urea according to the final target conversion efficiency. According to the method, correction on the theoretical maximal conversion efficiency of the catalyst is increased, the target conversion efficiency of the catalyst under various working conditions is compared with the theoretical maximal conversion efficiency, and the smaller one is selected to determine the injection quantity of the urea, so that the injection quantities of the urea under various working conditions can be accurately controlled, and thereby the urea is prevented from being excessively injected under various working conditions of the engine, and the risk of ammonia leakage is reduced.
Description
Technical field [0001] The present invention relates to the technical field of exhaust gas treatment, in particular to an SCR control method and device. Background technique [0002] With the continuous strict requirements of engine emission regulations in various countries around the world, engine exhaust aftertreatment technology has also been continuously developed. my country will fully implement the National IV emission regulations on January 1, 2015. In order to meet the restrictions on soot and nitrogen oxides by the National IV emission regulations, engines mainly use SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) to reduce nitrogen. Oxide emissions. [0003] The basic working principle of SCR is that the urea injection unit sprays a quantitative amount of urea aqueous solution into the exhaust pipe in the form of mist. The urea droplets undergo hydrolysis and pyrolysis reactions under the action of high temperature exhaust gas to generate the required r...
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IPC IPC(8): F01N9/00
CPCY02T10/40
Inventor 王军王胜王奉双谭海亮
Owner WEICHAI POWER CO LTD