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Fault judgment method and system for SCR carrier of engine and engine

A fault judgment and engine technology, applied to engine components, combustion engines, machines/engines, etc., can solve problems such as misjudgment

Active Publication Date: 2021-07-23
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to at least solve the problem of how to avoid the misjudgment that occurs in the judgment process that the SCR carrier is removed

Method used

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  • Fault judgment method and system for SCR carrier of engine and engine
  • Fault judgment method and system for SCR carrier of engine and engine
  • Fault judgment method and system for SCR carrier of engine and engine

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Embodiment Construction

[0045] 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.

[0046] It should be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may also be meant to include the plural forms unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated...

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Abstract

The invention discloses a fault judgment method and system for an SCR carrier of an engine and the engine. The method comprises the steps that S1, the current conversion efficiency of an SCR is calculated, S2, the operation parameters of the engine are obtained, S3, whether the operation parameters of the engine meet the calibration parameters or not is judged, S4, if the operation parameters of the engine meet the calibration parameters, the efficiency difference value of the current conversion efficiency of the SCR and the reference conversion efficiency is calculated; S5, the efficiency difference value is compared with an efficiency calibration value; S6, the limiting value conversion efficiency of the SCR is obtained; S7, the limiting value conversion efficiency is compared with the current conversion efficiency of the SCR; and S8, the SCR carrier is judged to be removed according to the fact that the efficiency difference value is larger than or equal to the efficiency calibration value and the limiting value conversion efficiency is larger than the current conversion efficiency of the SCR. According to the fault judgment method, accurate recognition and timely discovery of SCR carrier removal are achieved, the requirements of laws and regulations are met, fault misjudgment caused by SCR sulfur poisoning and crystallization can be effectively avoided, and the use experience of a user is improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a fault judging method for an engine SCR carrier, a fault judging system and an engine. Background technique [0002] This section provides background information related to the present disclosure only and is not necessarily prior art. [0003] At present, non-road four-stage diesel engines generally adopt after-treatment devices with DOC+DPF+SCR (copper-based), and non-road four-stage regulations clearly require the removal of SCR carriers "monitoring the carrier of the SCR after-treatment system through the NOx concentration sensor At the same time, the system failure should be monitored", and the SCR carrier removal can be judged by monitoring the SCR conversion efficiency through the NOx concentration sensor. [0004] However, due to the fact that the actual situation of the fuel quality market is uneven, there are many fuels that do not meet the national standard sulfur con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N3/20
CPCF01N11/00F01N3/2066F01N2550/02Y02T10/12Y02T10/40
Inventor 何乃鹏李钊马广营高莹
Owner WEICHAI POWER CO LTD