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A diagnostic method for abnormal concentration of urea solution in scr system

A technology of SCR system and solution concentration, which is applied in the diagnosis device of exhaust treatment device, electric control of exhaust treatment device, machine/engine, etc. It can solve problems such as inability to diagnose, abnormal concentration of urea solution, etc., and reduce system cost , The effect of improving product competitiveness

Active Publication Date: 2022-05-17
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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  • A diagnostic method for abnormal concentration of urea solution in scr system
  • A diagnostic method for abnormal concentration of urea solution in scr system
  • A diagnostic method for abnormal concentration of urea solution in 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 specifically discloses a method for diagnosing the abnormal concentration of urea solution in an SCR system, which includes: detecting whether the enabling condition is met; Downstream NO x Integral operation is performed on the measured value of the sensor, and at the same time, the NO calculated by the SCR chemical reaction model x value for integral operation; according to the upstream NO of the SCR system x The result of the integral calculation of the sensor measurement value is used to judge the SCR upstream NO x Whether the cumulative value of mass flow exceeds the preset threshold, and whether the cumulative time exceeds the preset time; if both exceed, calculate the SCR upstream NO x The difference between the mass flow cumulative value of the sensor and the mass flow cumulative value calculated by the SCR chemical reaction model; according to whether the difference exceeds the preset difference, it is judged whether there is an abnormality in the concentration of the urea solution in the SCR system. The method for diagnosing the abnormal concentration of the urea solution in the SCR system provided by the invention can realize the diagnosis of the abnormal concentration of the urea solution.

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 Patents(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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