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Dinuclear urea SCR system emission control method based on NMPC

A technology of SCR system and emission control, which is applied in the electronic control of exhaust treatment devices, exhaust treatment, exhaust devices, etc., can solve the problems of limited emission and the inability to directly apply dynamic programming methods, and achieve the effect of simple process

Active Publication Date: 2017-05-31
JILIN NORMAL UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of NMPC-based dual-core urea SCR system emission control method, which concentratedly solves the multi-objective optimization problem of problems such as limited discharge and actuator saturation in the dual-core urea SCR system; The nuclear urea SCR system has a strong nonlinearity, and the equivalent discrete equation cannot be directly derived by mathematical methods such as Euler's formula, and the conventional dynamic programming method cannot be directly applied. Therefore, the present invention proposes a method based on interpolation and nonlinear optimization methods. NMPC Urea Injection Controller

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  • Dinuclear urea SCR system emission control method based on NMPC
  • Dinuclear urea SCR system emission control method based on NMPC
  • Dinuclear urea SCR system emission control method based on NMPC

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specific Embodiment approach

[0041] A kind of NMPC-based dual-nuclear urea SCR system discharge control method, comprises the following steps:

[0042] 1. Establish a control-oriented two-core eight-stage urea SCR system model;

[0043] 2. Propose a description method for NMPC optimization problem of urea SCR system;

[0044] 3. Propose the operation steps of the NMPC urea injection controller of the dual-core urea SCR system.

[0045] 3.1 In the first prediction time domain, assume that the initial value of u(k) in all sampling periods is u max .

[0046] 3.2 In the Simulink software, use the nonlinear numerical algorithm toolbox NAG to solve the above cost function and constraint problems, and obtain the optimal solution for all sampling periods in the control time domain.

[0047] 3.3 Assume that the optimal solution in the control time domain of the kth step obtained and executed is u opt (k)=[u opt (k), u opt (k+1),...,u opt (k+q)], this value is used as the initial value of step k+1.

[0048] ...

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Abstract

Disclosed is a dinuclear urea SCR system emission control method based on NMPC. The method mainly comprises the steps that a dinuclear eight-order urea SCR system model oriented to control is established; a urea SCR system NMPC optimization problem description method is put forward; and the operating steps of a dinuclear urea SCR system NMPC urea spray controller are put forward. According to the dinuclear urea SCR system emission control method based on NMPC, the dinuclear eight-order urea SCR system model oriented to control can accurately describe the dynamic characteristics of chemical reactions of the system, the complexity is suitable for designing the controller. The dinuclear urea SCR system NMPC optimization problem description method and the operating steps of the urea spray controller are simple in process and suitable for engineering application.

Description

technical field [0001] The invention belongs to the technical field of diesel engine urea SCR emission aftertreatment system control, in particular to a dual-core urea SCR system emission control method based on nonlinear model predictive control (NMPC). Background technique [0002] Diesels produce more NO than petrol engines due to their lean burn characteristics x harmful gas. With the worldwide targeting of NO x More and more stringent regulations on emissions have been introduced, and various methods are used to reduce NO x The exhaust aftertreatment system available. These technologies include urea selective catalytic reduction (SCR) systems. The urea SCR system does not require additional fuel when it works, and the urea consumption is relatively low. With these advantages, it has already occupied a certain advantage in the automotive industry. In my country, the current actual national conditions are that the sulfur content in fuel oil is relatively high, and th...

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Application Information

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IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/2073F01N3/208F01N9/00F01N2610/02F01N2610/146Y02T10/12Y02T10/40
Inventor 赵靖华董延华黄雨蔡喜欣陈佳颖吕凯
Owner JILIN NORMAL UNIV
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