SCR system urea injection control method based on constraint H infinite feedback gain pulse spectrum table

A technology of SCR system and urea injection, which is applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of application limitation of H∞ feedback control method, achieve reduced calculation amount, strong practicability, and derivation process simple effect

Active Publication Date: 2017-05-31
JILIN NORMAL UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, most of the vehicle-mounted controlled object models, including the urea SCR system, are nonlinear systems, which limits the application of the H∞ feedback control method to a certain extent.

Method used

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  • SCR system urea injection control method based on constraint H infinite feedback gain pulse spectrum table
  • SCR system urea injection control method based on constraint H infinite feedback gain pulse spectrum table
  • SCR system urea injection control method based on constraint H infinite feedback gain pulse spectrum table

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Experimental program
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Embodiment Construction

[0018] Concrete implementation steps of the present invention are as follows:

[0019] 1), for the derivation of the H∞ controller based on the model, establish the nonlinear model of the urea SCR system;

[0020] First, the ordinary differential equation is used to represent the urea SCR system model, as follows:

[0021]

[0022] The parameters in the above formula are defined as follows:

[0023]

[0024]

[0025] Table 1 and Table 2 respectively show the relevant definitions of all constants and variables in the model and the nominal reference values ​​of the parameters.

[0026] Table 1 Constant nomenclature

[0027]

[0028] Table 2 variable nomenclature

[0029]

[0030] Next, to simplify the model, the T and Etc as measurable:

[0031]

[0032]

[0033] To prepare for the subsequent linearization of the model, the above equation can be further abstracted to obtain the nonlinear equation of the SCR system:

[0034]

[0035] 2), apply the...

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Abstract

The invention discloses an SCR system urea injection control method based on an H infinite feedback gain pulse spectrum table, which belongs to the technical field of diesel engine urea SCR discharge post-processing system control. According to the invention, linear system H infinite state feedback and the multi-operating point gain pulse spectrum table are combined; the control demand of a nonlinear system in real industry is met; and the design advantages of an H infinite state feedback control theory is used. The existing LMI toolbox is reasonably used to solve an optimization problem offline. The calculation amount of an online control system can be reduced. The method has the advantages of simple derivation process and high practicality, and can provide a way for the design of a vehicle-mounted control system.

Description

technical field [0001] The invention belongs to the technical field of diesel engine urea SCR emission aftertreatment system control, and in particular relates to an SCR system urea injection control method based on an H∞ feedback gain map table. Background technique [0002] 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. In my country, the current actual national conditions are that the sulfur content in fuel oil is relatively high, and the promotion of many emission control technologies is restricted. Therefore, with its low sensitivity to sulfur, urea SCR discharge post-treatment technology has more advantages in the development of our country. The basic principle of urea SCR technology is to utilize the redox reaction between NOx and ammonia (N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04F01N3/20
CPCF01N3/208F01N2610/02F01N2610/146G05B13/042Y02A50/20Y02T10/12
Inventor 赵靖华周伟李筱魁吕凯谭振江丛飚
Owner JILIN NORMAL UNIV
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