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Method for improving NOx emission of engine based on SCR chemical reaction mathematic model

A mathematical model, chemical reaction technology, applied in the direction of engine components, combustion engines, machines/engines, etc., can solve problems such as poor follow-up calibration work

Active Publication Date: 2018-11-30
CHINA AUTOMOTIVE TECH & RES CENT +1
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Problems solved by technology

[0003] In view of this, the present invention aims to propose a method for improving engine NOx emissions based on the SCR chemical reaction mathematical model, to solve the problems of poor followability and the need for a large amount of calibration work under the transient conditions of the open-loop control method for calculating NOx emissions

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  • Method for improving NOx emission of engine based on SCR chemical reaction mathematic model

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[0047] It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "horizontal", "top", "bottom", "front", "rear", "left", "right", The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention The description is created and simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, ...

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Abstract

The invention provides a method for improving NOx emission of an engine based on an SCR chemical reaction mathematic model. A signal acquisition unit of the method mainly includes two temperature sensors in the upstream and downstream of an SCR catalyst, a downstream NOx sensor and an exhaust flow sensor. According to sensor acquisition values, the upstream NOx volume concentration of the catalystis calculated through the established SCR chemical reaction mathematic model, and thus the injection quantity of required reductant urea is calculated. By adopting the calculation method, an SCR system can serve as an independent system for control, the influence on the working condition of the engine is eliminated, the NOx content in engine exhaust components is calculated in real time, a MAP lookup method is replaced, and the standard working amount in a development link is greatly decreased. In addition, the method can achieve very well following under transient conditions, and the step change produced by NOx content calculation of a MAP chart during working condition jump is avoided.

Description

technical field [0001] The invention belongs to the technical field of tail gas emission of motor vehicles, in particular to a method for improving engine NOx emission based on an SCR chemical reaction mathematical model. Background technique [0002] With the society's increasing demand for motor vehicles, the low fuel consumption and high efficiency of diesel engines are favored by the society. In the face of high nitrogen oxide emissions from diesel engines, many technologies have emerged to improve emissions and reduce pollution. Selective catalytic reduction technology (SCR), which uses ammonia generated by urea decomposition as a reducing agent, has become the main technical route to improve emissions. my country's SCR technology is still in its infancy, and there are still many problems to be solved. The SCR system of the National Four and National Five stages generally adopts open-loop control, and the NOx emission is calculated by querying the MAP map. This calculat...

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Application Information

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IPC IPC(8): F01N3/20F01N11/00F01N9/00
CPCF01N3/208F01N9/005F01N11/00F01N11/002F01N2560/026F01N2560/06F01N2610/02Y02T10/12Y02T10/40
Inventor 钟祥麟郑雪龙
Owner CHINA AUTOMOTIVE TECH & RES CENT
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