Nitrogen oxide sensor

Abstract

The invention relates to a nitrogen oxide sensor. The nitrogen oxide sensor is formed by multiple layers of rectangular substrates, wherein a first layer of substrate, a second layer of substrate and a third layer of substrate from top to bottom form a gas inlet, a first chamber and a second chamber; an oxygen pump is arranged in the first chamber, an oxygen measuring pump is arranged in the second chamber, and a dispersion barrier part is arranged between the first chamber and the second chamber. An electrode of the oxygen pump consists of a first electrode and a second electrode which are arranged on the upper surface and the lower surface of the first layer of substrate, an electrode of the oxygen measuring pump consists of a third electrode and a fourth electrode which are arranged on the upper surface and the lower surface of a third layer of substrate, and a reference gas passage which is communicated with the atmosphere is arranged on the third layer of substrate. By adopting the nitrogen oxide sensor, the six-wire system is realized, the structure is optimized, and a good foundation is laid for the subsequent signal precision.

Description

Technical field [0001] The invention relates to the field of motor vehicle exhaust emission detection, in particular to a nitrogen oxide sensor. Background technique [0002] The exhaust gas produced by burning fuel with air as the oxidant source usually contains a small amount of but noteworthy various nitrogen oxides (NO, NO 2 Etc.), collectively referred to as NO x . NO x It can not only destroy the ozone layer and convert it into acid rain, but also easily react with hydrocarbons or volatile organic compounds in the sun to produce photochemical smog, cause respiratory diseases, and seriously threaten human survival and health, so it is not welcome. [0003] With the development of society, the number of motor vehicles is increasing, and the exhaust of motor vehicles includes a variety of emissions, such as nitrogen oxides and particulate matter. In order to protect the environment and reduce harmful emissions from motor vehicles, emissions are controlled by using exhaust syste...

AI Technical Summary

Problems solved by technology

[0004] Existing NO x The sensor is generally an eight-wire system, and there are many lead wires, which will affect the subsequent measurement accuracy.

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