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Calibration method of NOx sensor based on working time sequence

A verification method and technology of working sequence, applied in the field of sensors, can solve the problem that the NOx sensor cannot be accurately calibrated or determine the detection error, and achieve the effect of accurate verification results.

Inactive Publication Date: 2021-04-30
CSSC POWER (GRP) CO LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a method for checking the NOx sensor based on the working sequence, which can solve the problem that the NOx sensor running for a long time cannot be accurately calibrated or its detection error can be determined.

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  • Calibration method of NOx sensor based on working time sequence
  • Calibration method of NOx sensor based on working time sequence

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Embodiment Construction

[0023] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0024] see figure 1 , NOx sensor detection unit 100, including NOx sensor 10, NOx signal processing box 20, NOx detection control module 30 and 24V power supply 40. Its working sequence is:

[0025] 1. The system is powered on, the PLC of the NOx detection control module 30 is started, and the CAN bus is started.

[0026] 2. The NOx senso...

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Abstract

The invention discloses a calibration method of a NOx sensor based on a working time sequence. The calibration method comprises the following steps: connecting a NOx sensor unit to a standard NOx container; measuring the NOx detection concentrations of the standard NOx containers with different concentrations; and comparing the detection concentrations with standard gas concentration to calibrate the precision or error of the NOx sensor. According to the method, on the basis of the working time sequence of the NOx sensor unit, the NOx sensor is calibrated through a complete set of NOx sensor unit assembly and calibration gases with different concentrations; and the method is simple and easy to operate, the calibration result is accurate, and effective reference is provided for precision control over the NOx sensor.

Description

Technical field [0001] The present invention relates to sensor technology, and in particular, to a calibration method of NOx sensors based on working timing. Background technique [0002] With the entry into force of the Tier III NOx emission control area recognized by the IMO organization, marine engines of some newly built ships must meet the Tier III emission level. Currently, there are two main ways to realize emissions from marine Tier III engines: the first is exhaust gas after-treatment based on SCR; the second is in-engine emission control based on EGR. [0003] In the first method, the SCR system is equipped with a set of NOx sensor units to continuously monitor the NOx emission concentration in the exhaust gas. This sensor unit is critical to the reliable operation of the SCR system. This set of units includes NOx sensors, NOx signal processing boxes, and NOx detection control modules. The NOx sensor is connected to the control module through the CAN bus. [00...

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Application Information

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IPC IPC(8): F01N11/00G01N33/00
CPCF01N11/00G01N33/0037G01N33/0006G01N33/007Y02T10/40
Inventor 刘锋华姚晶徐赵刚刘聪
Owner CSSC POWER (GRP) CO LTD
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