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Chip oxygen sensor

An oxygen sensor, a chip technology, applied in the field of chip oxygen sensors, can solve the problems of easily generating clutter, affecting the accuracy of the test signal, reducing the sensitivity of the chip oxygen sensor, etc., to eliminate the influence of clutter, prevent directional movement, The effect of enhancing stability

Active Publication Date: 2012-04-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the homogeneity of lead wires, pins and electrode sheets, clutter is likely to be generated in a complex exhaust gas environment, thereby affecting the accuracy of the test signal and reducing the sensitivity of the chip oxygen sensor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0015] If the lead wires of the test electrodes are directly exposed to the automobile exhaust, they are easily eroded by the automobile exhaust gas, causing changes in the internal resistance of the chip oxygen sensor and reducing the efficiency of the signal transmission of the test electrode leads; when the chip sensor is packaged, the lead wires of the test electrodes In direct contact with the sealed ceramic parts, it is easy to be pinched off or damaged by the sealed ceramic parts. Therefore, as a preferred embodiment of the present invention, a layer of zirconia is further provided above the lead wires of the test electrodes. The zirconia layer, on the one hand, can prevent the automobile exhaust from directly corroding the test electrode leads; on the other hand, it can increase the mechanical strength and wear resistance of the chip oxygen sensor, preventing it from being pinched off by the sealed ceramic part during the packaging process, and increasing the chip oxyge...

Embodiment 1

[0025] Print the reference electrode on one side of the zirconia cast sheet, and print the nano-insulation layer on the other side. The pattern can completely set off the lead pins of the test electrodes to be printed; after drying, continue to print the leads of the test electrodes on the nano-insulation layer , pins, print the electrode sheet of the test electrode on the area where the nano-insulation layer is not printed on the zirconia sensitive substrate, and ensure that the lead wire and the electrode sheet are connected to form a complete test electrode; after drying, continue to print on the electrode sheet of the test electrode Porous protective layer, printed zirconia layer (ZrO 2 The content is 97wt%) to get the first layer; in the nano-insulation layer, nano-alumina (average particle size is 40nm, specific surface area is 8m 2 / g) is 92wt%, silicon oxide is 2wt%, magnesium oxide is 2wt%, calcium oxide is 0.5wt%, titanium oxide is 2wt%, and chromium oxide is 1.5wt%....

Embodiment 2

[0028] The same method as in Example 1 was used to prepare the chip oxygen sensor sample A2, the difference being that:

[0029] In the nano-insulation layer, nano-alumina (average particle size is 30nm, specific surface area is 10m 2 / g) is 90wt%, silicon oxide is 3wt%, magnesium oxide is 2wt%, calcium oxide is 1wt%, titanium oxide is 2wt%, and chromium oxide is 2wt%.

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Abstract

The invention provides a chip oxygen sensor, which sequentially comprises a heating layer, a reference air layer and a sensing layer from bottom to top. The sensing layer comprises a zirconium oxide sensitive substrate, and a testing electrode and a reference electrode which are respectively arranged on the upper surface and the lower surface of the zirconium oxide sensitive substrate. The testing electrode comprises an electrode plate, a lead and a pin. A nanometer isolating layer is arranged between the lead and the pin of the testing electrode and the zirconium oxide sensitive substrate and is used for preventing the lead and the pin of the testing electrode from being in direct contact with the zirconium oxide sensitive substrate. The chip oxygen sensor provided by the invention has the advantage that the sensitivity is greatly improved by eliminating clutter through the isolating layer.

Description

technical field [0001] The invention belongs to the field of automobile oxygen sensors, in particular to a chip oxygen sensor. Background technique [0002] The automotive oxygen sensor is a key component that feeds back the combustion gas condition to the engine control unit (ECU) in real time, and the electronically controlled injection system of the engine precisely controls the air-fuel ratio based on the signal provided by the oxygen sensor. Once the air-fuel ratio of the mixture deviates from the theoretical value, the purification ability of the three-way catalyst will drop sharply, so an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas, and send a feedback signal to the ECU, and then the ECU controls the injection. The increase or decrease of the fuel injection quantity of the fuel injector, so as to adjust the air-fuel ratio (A / F, the mass ratio of air to gasoline) of the mixture near the theoretical value. Exi...

Claims

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Application Information

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IPC IPC(8): G01N27/26B81B3/00
Inventor 郭聪陈福平李华向其军
Owner BYD CO LTD
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