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Method for correcting sensitivity of nitrogen-oxygen sensor

A technology of nitrogen and oxygen sensor and calibration method, which is applied in the field of calibration, can solve problems such as affecting gas diffusion and decreasing measurement sensitivity, and achieve the effect of solving measurement errors and improving steady-state measurement accuracy

Pending Publication Date: 2022-04-12
江苏精瓷智能传感技术研究院有限公司
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Problems solved by technology

[0003] In addition to a large amount of toxic gas, automobile exhaust also contains a lot of suspended solids and particulate matter dust. During long-term use, the diffusion channel of the nitrogen and oxygen sensor will be blocked due to the accumulation of particulate matter, which will affect the diffusion of the gas, and then show measurement performance. drop in sensitivity

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  • Method for correcting sensitivity of nitrogen-oxygen sensor
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  • Method for correcting sensitivity of nitrogen-oxygen sensor

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[0019] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The embodiments in the basic invention and all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all belong to the protection scope of the present invention.

[0020] According to the gas diffusion mechanism, the pump current has a linear relationship with the concentration of the gas to be measured, and its slope, that is, the sensitivity is recorded as K. During the use of the sensor, the diffusion channel will be blocked due to the accumulation of particles, which will affect the diffusion of the gas...

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Abstract

The invention relates to the field of automobile electronic sensing detection, in particular to a method for correcting the sensitivity of a nitrogen-oxygen sensor. According to the correction method, on the basis of a gas diffusion mechanism, the relationship among pump current, temperature and to-be-measured gas concentration is determined, online recalibration of sensitivity is carried out through a temperature disturbance method, K is recalibrated through the temperature disturbance method, and correction of the sensitivity of the sensor is achieved. The method is simple and reliable, and the detection precision of the sensor in the use process can be effectively improved.

Description

technical field [0001] The invention relates to a calibration method, in particular to a sensitivity calibration method of a nitrogen and oxygen sensor. Background technique [0002] In recent years, with the continuous development of the economy and the improvement of people's living standards, the number of cars in China has continued to rise, with an increase of more than 10%. By the end of 2020, the number of motor vehicles in China has exceeded 372 million. Tail gas pollution from automobile emissions is the main source of air pollution, accounting for more than 60% of air pollution components. Among them, nitrogen oxides mainly composed of NO and NO2 are a brown, harmful gas with a pungent smell. Although the content in automobile exhaust is not very high, its toxicity is very high. It is one of the important reasons for the formation of photochemical smog and acid rain. With the promulgation of the latest emission standards of China V, China VI and Europe, tradition...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 李曦汪振李怡林伟勋王杰
Owner 江苏精瓷智能传感技术研究院有限公司