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Method and system for controlling urea injecting quantity

A urea injection system and urea injection technology, which are applied in the control field, can solve the problems of ammonia leakage pollution, inaccurate urea injection amount, and substandard NOX, and achieve the effect of overcoming inaccurate urea injection amount and accurate urea injection amount.

Inactive Publication Date: 2012-06-27
WEICHAI POWER CO LTD
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Problems solved by technology

[0010] In view of this, the technical problem to be solved by the present invention is to provide a method and system for controlling the amount of urea injection, so as to overcome the problems of inaccurate urea injection amount due to substandard urea aqueous solution, NOX substandard air pollution and ammonia leakage air pollution. Phenomenon

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  • Method and system for controlling urea injecting quantity
  • Method and system for controlling urea injecting quantity
  • Method and system for controlling urea injecting quantity

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Embodiment Construction

[0055] The invention provides a method and system for controlling the injection amount of urea, which overcomes the phenomenon that the urea injection amount is inaccurate due to the substandard urea aqueous solution, the atmosphere is polluted by NOX not up to the standard, and the atmosphere is polluted by ammonia gas leakage. In order to facilitate the understanding of those skilled in the art, relevant terms are specifically explained below.

[0056] SCR: Selective catalytic reduction, which uses ammonia (NH3) to reduce NOx. Under the condition of 320-400°C, it uses a catalyst to reduce NOx to N2 and water that have no effect on the atmosphere. "Selectivity" means that ammonia is selectively reduced, and herein refers to selective reduction of NOx.

[0057] Closed-loop control: A control relationship in which the controlled output returns to the controlled input in a certain way and exerts a control influence on the input.

[0058] OBD: An online monitoring and diagnosis ...

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Abstract

The invention discloses a method for controlling urea injecting quantity. The method comprises the following steps of: determining the concentration of a current urea solution; comparing the concentration of the current urea solution and the concentration of a standard urea solution to obtain a correction coefficient; calculating corrected urea injecting quantity according to the correction coefficient and current urea demand quantity; and controlling a urea injection system to inject urea according to the corrected urea injecting quantity. The invention provides a method and a system for controlling urea injecting quantity to solve the problem that an aqueous solution of urea does not reach a standard to cause inaccurate urea injecting quantity.

Description

technical field [0001] The invention relates to the technical field of control, in particular to a method and system for controlling the injection amount of urea. Background technique [0002] At present, domestic and foreign diesel engine post-treatment technologies can be divided into two categories: [0003] One is SCR open-loop control, which requires a lot of calibration work and is greatly affected by external factors. [0004] The accuracy of the open-loop control system to adjust the SCR urea injection volume is limited by the technical conditions of the after-treatment system and the control procedures and data. Since the program and control data executed by the control system using the open-loop control method are formulated according to the test results of the prototype with the best technical condition, if the technical condition of the actually used engine is different from that of the prototype, the urea injection volume is still in accordance with If the man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N9/00
CPCY02T10/24Y02T10/47Y02T10/12Y02T10/40
Inventor 孙少军刘颖帅张军胡广地
Owner WEICHAI POWER CO LTD
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