Chip type oxygen sensor

Abstract

The invention discloses a chip type oxygen sensor, which has high heating efficiency, fast response speed and higher strength. The chip type oxygen sensor comprises three parts, namely, a ceramic heater (1), an alumina substrate (2) and a zirconium oxide substrate (3), which are sequentially arrange from bottom to top; a reference air channel (21) is arrange on the alumina substrate; an inner working electrode (31) and an inner working electrode (32) are pasted on the upper surface and lower surface of the zirconium oxide substrate (3) respectively; the outer working electrode (32) is printed with a porous protective layer (33); an alumina printing layer (4) and a zirconium oxide printing layer (5) are printed between the alumina substrate (2) and the zirconium oxide substrate (3); the alumina printing layer (4) is printed on the upper side surface of the alumina substrate (2); and the zirconium oxide printing layer (5) is printed on the lower side surface of the zirconium oxide substrate (3). The chip type oxygen sensor can be applied in the technical field of automobile engine exhaust testing.

Description

technical field [0001] The invention relates to a sensor, in particular to a chip-type oxygen sensor for an electric injection engine of an automobile. The oxygen sensor is used to control the ratio of air and fuel in the automobile engine so as to make the automobile fuel burn more fully. Background technique [0002] The exhaust emission detection system used in modern automobile engines, its working process is: detect the oxygen concentration in the exhaust gas discharged after the combustion of the engine cylinder, compare it with the oxygen concentration of the exhaust gas generated under the ideal combustion state, and control the air supplied to the engine through feedback To achieve the purpose of reducing the amount of harmful substances in the exhaust gas. Its core component is the oxygen sensor. [0003] For this reason, many scientific research institutions, universities and colleges, as well as companies and enterprises have been devoting themselves to the rese...

AI Technical Summary

Problems solved by technology

But there is still a problem with this oxygen sensor

The sensitivity of this sensor is not enough, because the three-layer matrix uses zirconia as the base material, and the thermal conductivity of zirconia is only 3W / (m·K), its heat conduction speed is too slow, and the zirconia matrix containing the micro heating circuit at the bottom The time for the heat generated by the upper layer to transfer to the sensitive element on the upper layer is too long, so that the sensor cannot detect the oxygen content in the exhaust gas of the vehicle for a long time after the start, so that the fuel control ratio cannot be adjusted in time. This also indirectly increases the input of fuel and causes more serious environmental pollution; secondly, because the thermal conductivity of zirconia is only 3W / (m K), it needs to consume more electric energy in its heating circuit to obtain the same amount of heat. heat, which consumes a lot of energy

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