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Method and system for correcting urea spraying quantity

A technology of urea injection and injection quantity, which is applied in the direction of electronic control of exhaust gas treatment device, diagnosis device of exhaust gas treatment device, exhaust gas treatment, etc., to achieve the effect of avoiding waste, reasonable catalytic effect, and accurate actual injection amount

Inactive Publication Date: 2017-05-31
WEICHAI POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The present invention aims at the problem that the injection accuracy of urea nozzles will be different under different cumulative use time and different injection volumes. Correction of urea injection volume

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  • Method and system for correcting urea spraying quantity
  • Method and system for correcting urea spraying quantity

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Embodiment Construction

[0027] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0028] According to the embodiment of the present invention, propose a kind of method of correcting urea injection quantity, this method comprises the following steps:

[0029] 1. Obtain the corrected MAP of the urea injection amount with respect to the cumulative working time of the urea nozzle through calibration. Specifically, this step can be implemented through the following sub-steps:

[0030] S1-Set up a calibration test be...

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Abstract

The invention relates to a method for correcting an urea spraying quantity. The method comprises the steps of: obtaining a corrected MAP of the urea spraying quantity about accumulated working time of an urea nozzle through calibration; calculating a target urea spraying quantity under real-time working conditions according to an engine rotating speed, a circular oil spraying quantity, an exhaust temperature, an exhaust flow and a real-time NOX mass flow; and determining a MAP point corresponding to the real-time working conditions in the corrected MAP according to the accumulated working time of the actually used urea nozzle and the calculated target urea spraying quantity, obtaining correcting coefficients of the urea nozzle under the real-time working conditions, and correcting the calculated target urea spraying quantity. In addition, the invention further proposes a system for realizing the method; and the system comprises a corrected MAP storage module, a calculating module and a correcting module.

Description

technical field [0001] The invention relates to the technical field of post-treatment of engine fuel injection, in particular to a method and system for correcting urea injection quantity. Background technique [0002] The urea injection quantity of the prior art scheme is based on the rotational speed of the current real-time working condition, the cycle fuel injection quantity, the exhaust gas temperature and the exhaust gas flow data, based on nitrogen oxides (NO X ) conversion efficiency and temperature correction calculated. The amount of urea injection does not take into account the wear of the nozzle after long-term use. However, after the nozzle is worn out, the actual urea injection volume is more than the calculated injection volume, which will affect the discharge and increase the risk of urea crystallization. [0003] In addition to normal wear and tear, the accuracy of the system will also decrease after long-term use, and the injection volume may deviate from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N9/00F01N3/20F01N11/00
CPCF01N3/208F01N9/00F01N11/00F01N11/002F01N2900/0412F01N2900/08F01N2900/1404F01N2900/1621Y02T10/12Y02T10/40
Inventor 刘兴龙郎俊宇王军王孝莉李晓光刘旭海
Owner WEICHAI POWER CO LTD
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