SCR system urea injection control method based on data drive prediction control

An SCR system, data-driven technology, applied in general control systems, control/regulation systems, adaptive control, etc., can solve problems such as system output limitations

Active Publication Date: 2017-03-22
JILIN NORMAL UNIV
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Problems solved by technology

In addition, there are many constraints on the parameters of the urea SCR system
For example, the system input (urea injector injection volume) has a maximum limit, and the system output (NO x with NH 3 ) are subject to emission regulations, etc.

Method used

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  • SCR system urea injection control method based on data drive prediction control
  • SCR system urea injection control method based on data drive prediction control
  • SCR system urea injection control method based on data drive prediction control

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Embodiment Construction

[0089] The SCR system urea injection control method based on data-driven predictive control of the present invention comprises the following steps:

[0090] 1. Establish an accurate distributed parameter urea SCR system excitation model;

[0091] 2. According to the dynamic characteristics of the system, the data that affect the wide range of engine emission boundary conditions can be used to fully motivate the system;

[0092] 3. The obtained NO will be incentivized x and NH 3 Discharge the input and output data, and construct the subspace predictive controller of the system;

[0093] 4. Construct a cost function for emission optimization control by considering emission standards and constraints such as urea nozzles;

[0094] 5. Finally, by solving the corresponding discharge optimization problem of the urea SCR system, the urea injection control amount is obtained, so as to realize the control of the urea SCR system.

[0095]The research on the urea injection control met...

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Abstract

The invention discloses an SCR system urea injection control method based on data drive prediction control. The method mainly includes a distributed parametric excitation model and a subspace prediction controller. The excitation model consists of a distributed parameter SCR system of master and slave catalyst units formed by a six-core ordinary differential equation and an enDYNA software precise diesel model. The subspace prediction controller adopts a two-input two-output data excitation structure, and is obtained directly by input and output data of the excitation model through excitation. In addition, coupling excitation is performed on prediction output and constraint output, and then prediction output and constraint output expressions are separated by a derived increment type prediction model. The data excitation distributed parameter model of the SCR system urea injection control method based on data drive prediction control is simple in structure and accurate in precision, and the subspace prediction controller derivation is simple in process, and is suitable for engineering application.

Description

technical field [0001] The invention belongs to the technical field of diesel engine urea SCR emission post-treatment system control, and in particular relates to a data-driven predictive control-based SCR system urea injection control method. Background technique [0002] Compared with gasoline engines, diesel engines have higher fuel economy and power output. However, due to its lean burn characteristics, diesel engines produce more NO than gasoline engines 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 curr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/048
Inventor 赵靖华周伟丛飚谭振江吕凯
Owner JILIN NORMAL UNIV
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