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A rolling time-domain control method for ammonia coverage in urea scr system

An SCR system, rolling time domain technology, applied in engine components, combustion engines, machines/engines, etc., can solve the problems of lack of time-varying target tracking control discussion, tracking controller system uncertainty and constraint influence discussion, etc. Simple steps and robust effects

Active Publication Date: 2022-03-11
JILIN NORMAL UNIV
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  • Application Information

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Problems solved by technology

[0004] However, the current ammonia coverage nonlinear tracking control problem still faces the following challenges: 1. Most tracking control methods are for time-invariant targets, and there is a lack of in-depth discussions on time-varying target tracking control; 2. The tracking controller The design process lacks discussion of the impact of system uncertainties and constraints

Method used

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  • A rolling time-domain control method for ammonia coverage in urea scr system
  • A rolling time-domain control method for ammonia coverage in urea scr system
  • A rolling time-domain control method for ammonia coverage in urea scr system

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Embodiment Construction

[0032] The present invention is implemented in this way, a rolling time-domain control method for ammonia coverage of a urea SCR system, the method includes: ① establishing a control-oriented two-core eighth-order urea SCR system model; ② designing a rolling time-domain differential flat feed-forward controller , ③ Design rolling time domain H ∞ The feedback controller is implemented in three steps, the specific steps are as follows:

[0033] Step 1. Establish a control-oriented two-core eighth-order urea SCR system model:

[0034] The single-core model of urea SCR system can be expressed by the ordinary differential equation as follows:

[0035]

[0036] in:

[0037]

[0038] Table 1 and Table 2 respectively show the relevant definitions of all constants and variables in the model and the nominal reference values ​​of parameters,

[0039] Table 1 Constant nomenclature

[0040]

[0041] Table 2 variable nomenclature

[0042]

[0043] Based on the single-core m...

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Abstract

The invention discloses a rolling time-domain control method for the ammonia coverage rate of a urea SCR system. The main content of the invention includes establishing a control-oriented two-core eighth-order urea SCR system model; designing a rolling time-domain differential flat feed-forward controller; designing a rolling time-domain h ∞ feedback controller. The rolling time-domain control method of ammonia coverage rate of urea SCR system proposed by the present invention has simple steps and is suitable for engineering application; it can realize the tracking of time-varying target of ammonia coverage rate, and at the same time, it takes into account the influence of system uncertainty and constraints on the controller , has strong robustness.

Description

technical field [0001] The invention belongs to the technical field of state tracking control of a urea SCR exhaust post-treatment system of a diesel engine, and in particular relates to a rolling time-domain control method for the ammonia coverage rate of a urea SCR system. Background technique [0002] Urea Selective Catalytic Reduction (urea-SCR) emission post-treatment technology has certain advantages due to its low cost and high efficiency. Moreover, the urea SCR system is less sensitive to sulfur. According to the actual national conditions of high sulfur content in fuel oil in my country, this technology has more advantages. The basic principle of the urea SCR system is to use ammonia (NH 3 ) to reduce the NO produced by the engine x , These ammonia are generally derived from 32.5% urea solution (Tianlan solution). Although ammonia can reduce NO x , but it is also harmful to humans and has a pungent odor, although it is not expressly stipulated in the current emi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/208F01N9/005F01N2610/02F01N2900/0411F01N2900/0408Y02T10/12Y02T10/40
Inventor 赵靖华丛飚周伟吕凯谭振江
Owner JILIN NORMAL UNIV