A feed-forward correction method for SCR electronic control system based on zirconia NOx sensor
An electronic control system and sensor technology, which is applied to the electronic control of exhaust treatment devices, machines/engines, mechanical equipment, etc., can solve the problem that NOx emissions do not meet the requirements of emission regulations, and the denitrification performance of the SCR system is not considered. impact, NH3 escape exceeds the standard, etc., to achieve the effect of reducing workload, improving portability and adaptability, and improving accuracy and response speed
Active Publication Date: 2020-01-31
JIMEI UNIV
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Problems solved by technology
[0006] The open-loop control strategy based on the MAP map of urea injection quantity does not consider the influence of the exhaust gas characteristic change on the denitrification performance of the SCR system during the actual operation of the diesel engine, and the feedforward correction based on the NOx concentration ignores the influence of the change of the mass flow rate of the diesel engine exhaust gas on the denitrification performance of the SCR system Impact
Both may cause the NOx emission after the SCR reactor to fail to meet the emission regulations and cause NH 3 escape exceeded
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[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0043] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0044] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...
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The invention relates to a feedforward correction method for an SCR electronic control system based on a zirconia type NOx sensor. First, an SCR electronic control system collects and processes dieselengine speed, torque and signal information of an NOx sensor before an SCR reactor; wherein the signal information of the NOx sensor includes the concentration of O2 and the concentration of NOx; then an excess air coefficient calculation model is established: then an excess air coefficient calculation model is established; an MAP query program stored in the SCR electronic control system is executed, and a urea basic injection amount, excess air coefficient and original machine NOx concentration MAP corresponding to current diesel engine working conditions is queried; a urea O2-Urea correction amount and a urea NOx-Urea correction amount are calculated in turn; and finally, the urea injection amount is corrected. The basic injection amount of urea is corrected according to the method, andNOx emission and NH3 escape exceeding the standard after the SCR reactor caused by changes of the diesel engine exhaust characteristics are avoided.
Description
technical field [0001] The invention relates to the field of SCR (selective catalytic reduction) of marine diesel engines, in particular to a feed-forward correction method of an SCR electronic control system based on a zirconia-type NOx sensor. Background technique [0002] According to the provisions of Annex VI of the MARPOL Convention promulgated by the International Maritime Organization (IMO), ships built after January 1, 2016, if they sail in the emission control area, their engine NOx emissions will implement a more stringent Tier III standard. SCR technology has the advantages of good economy, small changes to diesel engines, high NOx conversion rate, insensitivity to sulfur and wide application range, etc. It is one of the technologies with great application prospects for NOx emission control of marine diesel engines. [0003] After the marine diesel engine is equipped with an SCR system, its exhaust back pressure will increase, and the increase of exhaust back pre...
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IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/2066F01N3/208F01N2560/026F01N2570/14F01N2610/02F01N2900/0404F01N2900/0411F01N2900/0412F01N2900/0416Y02T10/12Y02T10/40
Inventor 尹自斌欧顺华曾步辉
Owner JIMEI UNIV