Upstream NOx sensor fault identification method and device, vehicle and storage medium

A technology of sensor failure and identification method, which is applied in the field of vehicle detection, and can solve the problems of identification and low measurement value of upstream NOx sensor

Active Publication Date: 2021-02-26
WEICHAI POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present application provides an upstream NOx sensor fault identification method, device, vehicle and storage medium to solve the existing problem of being unable to identify the low measured value of the upstream NOx sensor in real time efficiently

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  • Upstream NOx sensor fault identification method and device, vehicle and storage medium
  • Upstream NOx sensor fault identification method and device, vehicle and storage medium
  • Upstream NOx sensor fault identification method and device, vehicle and storage medium

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Embodiment Construction

[0049] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0050] First, the technical terms and their abbreviations involved in the embodiments of this application are introduced:

[0051]Electronic Control Unit (Electronic Control Unit, ECU): A control device composed of integrated circuits used to implement a series of functions such as analysis, processing and sending of data, also known as "driving compu...

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Abstract

The invention provides an upstream NOx sensor fault identification method and device, a vehicle and a storage medium. A target improvement coefficient is determined by acquiring a first emission valuedetected by an upstream NOx sensor and a second emission value detected by a downstream NOx sensor or acquiring a current urea injection amount in an SCR box; and according to the current urea injection amount and the target improvement coefficient, after the urea injection amount in the SCR box is adjusted to a target urea injection amount, a third emission value detected by the downstream NOx sensor is obtained, and if the third emission value is smaller than or equal to a preset emission standard exceeding threshold value, it is determined that the measurement value of the upstream NOx sensor is low. By comparing the emission value detected by the downstream NOx sensor with the emission standard exceeding threshold value in real time, the judgment that the measurement value of the upstream NOx sensor is low is determined, a driver is further reminded of related faults of a vehicle in due time, and technicians can efficiently and accurately locate fault causes.

Description

technical field [0001] The present application relates to the technical field of vehicle detection, and in particular to an upstream NOx sensor fault identification method, device, vehicle and storage medium. Background technique [0002] As the climate crisis intensifies, environmental protection has become an important measure to ensure sustainable economic and social development. Therefore, various countries have formulated a series of regulations and standards, and engine exhaust emission standards are an important part of them. In order to keep the content of nitrogen oxides (NOx) in the engine exhaust from exceeding the regulatory standards, it is necessary to treat the engine exhaust with a Selective Catalytic Reduction (SCR) box, and detect the NOx content through the upstream NOx sensor to control the urea The amount of injection can make the NOx and urea fully react, and ensure that the NOx content in the exhaust gas discharged from the engine is lower than the leg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N3/20G01N33/00
CPCF01N11/00F01N3/2066G01N33/0037G01N33/007G01N33/0006G01N33/0063F01N2570/14Y02T10/12Y02T10/40Y02A50/20
Inventor 王通徐永新孙国治
Owner WEICHAI POWER CO LTD
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