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Method for diagnosing abnormal concentration of urea solution of SCR system

A technology of SCR system and solution concentration, applied in the diagnosis device of exhaust gas treatment device, electronic control of exhaust gas treatment device, exhaust gas treatment and other directions, can solve the problems of abnormal concentration of urea solution, inability to diagnose, etc., to improve product competition power and reduce system cost

Active Publication Date: 2020-12-22
WUXI WEIFU LIDA CATALYTIC CONVERTER
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Problems solved by technology

[0003] The invention provides a method for diagnosing the abnormal concentration of urea solution in an SCR system, which solves the problem that the abnormal concentration of urea solution in the related art cannot be diagnosed

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  • Method for diagnosing abnormal concentration of urea solution of SCR system
  • Method for diagnosing abnormal concentration of urea solution of SCR system
  • Method for diagnosing abnormal concentration of urea solution of SCR system

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Embodiment Construction

[0030] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0031] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments of some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that the terms "f...

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Abstract

The invention relates to the technical field of diesel engine aftertreatment system control, and particularly discloses a method for diagnosing abnormal concentration of a urea solution of an SCR system. The method comprises the steps that whether an enabling condition is met or not is detected; when the enabling condition is met, integral operation is carried out on upstream and downstream NOx sensor measurement values of the SCR system, and meanwhile integral operation is carried out on an NOx value calculated by an SCR chemical reaction model; according to the result of integral operation on the upstream NOx sensor measurement value of the SCR system, whether the accumulated value of the SCR upstream NOx mass flow exceeds a preset threshold value or not and whether the accumulated timeexceeds preset time or not are judged; if the accumulated value of the SCR upstream NOx mass flow exceeds the preset threshold value and the accumulated time exceeds the preset time, the difference value between the accumulated value of the SCR upstream NOx sensor mass flow and the accumulated value of the mass flow calculated by the SCR chemical reaction model is calculated; and according to whether the difference value exceeds a preset difference value or not, whether the concentration of the urea solution of the SCR system is abnormal or not is judged. According to the method for diagnosingabnormal concentration of the urea solution of the SCR system, diagnosis of abnormal concentration of the urea solution can be achieved.

Description

technical field [0001] The invention relates to the technical field of diesel engine aftertreatment system control, in particular to a method for diagnosing abnormal concentration of urea solution in an SCR system. Background technique [0002] With the further tightening of national emission regulations, diesel engines need to use after-treatment systems to further reduce emissions in order to meet the requirements of emission regulations. The SCR (Selective Catalytic Reduction) system injects urea solution into the exhaust gas. The urea solution decomposes into NH3 at high temperature, and reacts with the NOx in the exhaust gas under the action of the catalyst, thereby eliminating the harmful exhaust NOx in the exhaust gas. . The SCR system is composed of a control unit, urea tank, urea pump, nozzle, SCR catalyst and related sensors. In the national six-stage and non-road four-stage diesel engines for road use, OBD regulations require that the post-treatment system must ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N11/00
CPCF01N3/2066F01N11/00F01N2560/026F01N2610/02Y02T10/40
Inventor 苗垒陶建忠刘洋
Owner WUXI WEIFU LIDA CATALYTIC CONVERTER
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