Method and device for adjusting diagnosis frequency of oxynitride conversion efficiency

A technology of nitrogen oxides and conversion efficiency, which is applied in the diagnosis device of exhaust treatment device, electronic control of exhaust treatment device, exhaust treatment, etc., can solve the problems of misdiagnosis and low diagnosis times, and reduce false alarms , Accelerate reporting, reduce possible effects

Active Publication Date: 2020-04-21
WEICHAI POWER CO LTD
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Problems solved by technology

[0005] In view of the above problems, the present application provides a method and device for adjusting the number of diagnosis times of nitrogen oxide conversion efficiency, which is used to solve the problem of misdiagnosis caused by the small number of diagnosis times of SCR efficiency

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  • Method and device for adjusting diagnosis frequency of oxynitride conversion efficiency
  • Method and device for adjusting diagnosis frequency of oxynitride conversion efficiency
  • Method and device for adjusting diagnosis frequency of oxynitride conversion efficiency

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Embodiment Construction

[0046] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. 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.

[0047] see figure 1 , figure 1 It is a kind of NO provided by this application x A flowchart of a method for adjusting conversion efficiency diagnosis times, the method may include the following steps 101-104.

[0048] Step 101: Detect whether the vehicle is running under preset working conditions.

[0049] SCR will convert NO in the exhaust ...

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Abstract

The embodiment of the invention discloses a method and device for adjusting the diagnosis frequency of the oxynitride conversion efficiency. The method comprises the steps that whether a vehicle runsunder a preset working condition or not is detected; when the vehicle runs under the preset working condition, the conversion efficiency of oxynitride NOx is calculated; the correction frequency of NOx conversion efficiency diagnosis is obtained according to the corresponding relation between the NOx conversion efficiency and the correction frequency of NOx conversion efficiency diagnosis; and thefixed NOx conversion efficiency diagnosis frequency of the vehicle is automatically adjusted according to the correction frequency. According to the method, the NOx conversion efficiency diagnosis frequency is changed from a fixed value to a value changing along with the conversion efficiency; the diagnosis frequency can be automatically adjusted according to the NOx conversion efficiency in theSCR; therefore, the SCR fault detection frequency can be increased under the condition of high SCR actual efficiency, and the fault reporting frequency can be reduced under the condition of low SCR actual efficiency, so that the possibility of false alarm is reduced, and the reporting of real faults can also be accelerated.

Description

technical field [0001] The invention relates to the field of fault diagnosis, in particular to a method and a device for adjusting the diagnosis frequency of conversion efficiency of nitrogen oxides. Background technique [0002] With the continuous increase of motor vehicle emissions, the emission regulations for motor vehicle pollution have been continuously upgraded. In addition to requiring newly produced engines to meet production certification, it is also necessary to monitor emissions during driving, that is, On-Board Diagnostics (On-Board Diagnostics) , OBD). The on-board diagnostic system is an online monitoring system used to control vehicle emissions. At present, OBD has reached the second stage. The diagnostic requirements for the Selective Catalytic Reduction system (Selective Catalytic Reduction system, SCR) have developed from serious functional failures to SCR efficiency reduction. emissions exceed the standard. [0003] Currently, nitrogen oxides NO in SCR...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00
CPCF01N11/00F01N2900/1621Y02T10/40Y02A50/20
Inventor 王金平仝玉华王毓源
Owner WEICHAI POWER CO LTD
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