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Method and device for controlling stability of closed-loop controller

A technology of stability control and controller, which is applied in the direction of electric control of exhaust device, muffler device, exhaust treatment device, etc. It can solve problems such as urea overspray, ammonia leakage, closed-loop controller instability, etc., and achieve improved stability performance, reducing overspray and ammonia leakage

Active Publication Date: 2022-07-29
WEICHAI POWER CO LTD
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  • Claims
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Problems solved by technology

[0003] The present application provides a stability control method and device for a closed-loop controller, aiming to solve the problems in the prior art that the closed-loop controller in the SCR is unstable, a large amount of urea injection is oversprayed, and large ammonia leakage occurs

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  • Method and device for controlling stability of closed-loop controller
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  • Method and device for controlling stability of closed-loop controller

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Embodiment Construction

[0091] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0092] As used herein, the term "including" and variations thereof are open-ended inclusions, ie, "including but not limited to". The term "based on" is "based at least in part on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the descr...

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Abstract

The invention provides a stability control method and device for a closed-loop controller, and the method comprises the steps: calculating an ammonia leakage risk factor according to an aging factor of a catalyst of an SCR, ammonia leakage detection and urea injection detection, and estimating a target ammonia leakage value at the downstream of the SCR based on the ammonia leakage risk factor, an ammonia feedforward control quantity, an actual ammonia injection quantity and an ammonia efficiency injection quantity, and calculating a target NOx correction value based on the target ammonia slip value and the ammonia slip factor at the downstream of the SCR, and correcting a downstream NOx value of an SCR model included in the SCR based on the NOx correction value. According to the method, the downstream NOx value of the SCR model is corrected, so that the stability of a closed-loop controller is improved, and over-spraying of urea and ammonia leakage are reduced.

Description

technical field [0001] The present application relates to the technical field of vehicle exhaust gas treatment, and in particular, to a stability control method and device of a closed-loop controller. Background technique [0002] In the prior art, in the control process of the SCR (selectively catalytic reduction, selective catalytic conversion device) included in the aftertreatment system, the catalyst of the SCR is affected by thermal aging, irreversible chemistry, etc., and the actual conversion efficiency of the catalyst will continue to decrease. The SCR model in the SCR model still uses the pre-calibrated NOx as the downstream NOx of the SCR model for output, which leads to the instability of the closed-loop controller in the SCR, resulting in a large amount of over-injection of urea injection and large ammonia leakage. SUMMARY OF THE INVENTION [0003] The present application provides a method and device for controlling the stability of a closed-loop controller, ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N9/00F01N11/00
CPCF01N9/00F01N9/005F01N11/00F01N2900/04F01N2900/0411F01N2900/1621F01N2900/1616
Inventor 张竞菲张军谭治学杨新达王云
Owner WEICHAI POWER CO LTD
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