Abnormity positioning method and device and electronic control unit

An electronic control unit and positioning method technology, applied in the field of vehicles, can solve problems such as abnormal conversion efficiency, excessive ammonia discharge, and aggravated environmental pollution, so as to avoid excessive ammonia discharge and aggravate environmental pollution, improve accuracy, The effect of increasing conversion efficiency

Active Publication Date: 2019-12-06
WEICHAI POWER CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Embodiments of the present invention provide an abnormal location method, device and electronic control unit to accurately locate the cause of abnormal conversion efficiency and avoid excessive ammonia gas discharge and aggravate environmental pollution due to inaccurate location

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  • Abnormity positioning method and device and electronic control unit
  • Abnormity positioning method and device and electronic control unit
  • Abnormity positioning method and device and electronic control unit

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Embodiment Construction

[0075] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, 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 belong to the protection scope of the present invention.

[0076] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily Describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of practice in sequences other than...

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Abstract

The embodiment of the invention provides an abnormity positioning method and device and an electronic control unit. The method comprises the following steps that conversion efficiency of a selective catalytic reduction system is acquired after detecting that the electronic control unit is electrified and starts an engine; if the conversion efficiency is less than preset conversion efficiency, theconversion efficiency is determined to be abnormal, and a pressure value of a urea pump in the selective catalytic reduction system is acquired; reasons that the conversion efficiency is abnormal aredetermined according to the pressure value of the urea pump, wherein the reasons that the conversion efficiency is abnormal comprise the blockage of a urea nozzle in the selective catalytic reductionsystem, the aging of a catalyst in the selective catalytic reduction system or the insufficient amount of urea sprayed through the urea nozzle; and the reasons that the conversion efficiency is abnormal are sent to an alarm device. According to the method, the accuracy of positioning the reasons of the abnormal conversion efficiency can be improved, and after the reasons that the conversion efficiency is abnormal are accurately positioned, the reasons are sent to the alarm device, so that the related personnel can directly solve the problem that the conversion efficiency is abnormal successfully according to the reasons.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of vehicles, and in particular to an abnormality location method, device and electronic control unit. Background technique [0002] During the operation of motor vehicles, they will emit pollutants mainly composed of nitrogen oxides. In order to reduce the pollution of nitrogen oxides (Nitrogen Oxides, NOx) to the environment, Selectively Catalytic Reduction (Selectively Catalytic Reduction, SCR for short) system to control the emission of nitrogen oxides, that is, to control the urea nozzle in the system to spray urea, the urea is hydrolyzed to generate ammonia gas, and the ammonia gas reacts with nitrogen oxides under the action of the catalytic converter in the SCR system. This produces nitrogen and water. However, in the process of using the SCR system to treat nitrogen oxides, the conversion efficiency of nitrogen oxides may be lower than the normal value, that is, the convers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N11/00
CPCF01N3/2066F01N3/208F01N11/00F01N2570/14F01N2610/02Y02T10/12Y02T10/40
Inventor 张苏苏张硕朱娟张淑宁
Owner WEICHAI POWER CO LTD
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