Multilayer Chip Structure Oxygen Sensor

Abstract

The invention discloses a multilayered oxygen sensor with a sheet type structure. The multilayered oxygen sensor with the sheet type structure comprises a zirconium oxide sensitive layer, a reference air channel layer and a heating layer, wherein an outer electrode is arranged on the upper surface of the zirconium oxide sensitive layer and an inner electrode is arranged on the lower surface of the zirconium oxide sensitive layer; the multilayered oxygen sensor with the sheet type structure is characterized in that a first porous transition layer for adjusting thermal expansion coefficients of different structure layers and preventing the layers from being cracked is arranged between the zirconium oxide sensitive layer and the reference air channel layer; a second porous transition layer for adjusting the thermal expansion coefficients of the different structure layers and preventing the layers from being cracked is arranged between the reference air channel layer and the heating layer; the multilayered oxygen sensor with the sheet type structure is sequentially provided with the zirconium oxide sensitive layer, the first porous transition layer, the reference air channel layer, the second porous transition layer and the heating layer. According to the multilayered oxygen sensor with the sheet type structure, interlayer stress caused by thermal expansion of the different structure layers can be adjusted so as to prevent the layers from being cracked and guarantee the service life of the oxygen sensor; meanwhile, the stable performance between the different structure layers is guaranteed and the performance of the oxygen sensor is improved.

Description

technical field [0001] The invention relates to an oxygen sensor, in particular to an oxygen sensor with a multilayer chip structure. Background technique [0002] The automotive oxygen sensor is a key sensing component in the automotive electronically controlled fuel injection system (EFI). It is a solid electrolyte oxygen sensor. The oxygen sensor has a characteristic that it outputs near the theoretical air-fuel ratio A / F (14.7:1). There is a sudden change in the voltage, and it is mostly installed in the exhaust pipe of the car to measure the oxygen content in the exhaust gas of the car, convert it into an electrical signal, and then feed it back to the control unit. The control unit adjusts the air-fuel ratio A / F of the engine according to the signal. Adjust, when the actual air-fuel ratio becomes higher, the concentration of oxygen in the exhaust gas increases and the oxygen sensor notifies the control unit of the lean state of the mixture (small electromotive force: O...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the cracking and other failure phenomena of the existing chip structure oxygen sensor during use, the present invention provides a multi-layer chip structure oxygen sensor. Cracks between them ensure the service life of the sensor, and further improve the matching of mechanical properties between different structural layers of the oxygen sensor and increase the stability of each layer, thereby improving the performance of the sensor

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