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Production method for gas sensor element

A technology of gas sensor and manufacturing method, which is applied in the direction of instruments, scientific instruments, electrochemical variables of materials, etc., and can solve problems that do not mention the physical properties of geometric shapes

Active Publication Date: 2020-11-13
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in Patent Document 1, there is no mention of any physical properties other than geometry

Method used

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  • Production method for gas sensor element
  • Production method for gas sensor element
  • Production method for gas sensor element

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Experimental program
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Embodiment approach

[0022] Hereinafter, a method of manufacturing a gas sensor element will be described based on the drawings. Such as figure 1 As shown, the gas sensor 1 according to one embodiment includes: a gas sensor element 10, a housing 30, a first insulator 31, a second insulator 32, a cover 33, a contact terminal 34, a lead wire 35, a bushing 36, an inner cover 37, And the outer cover 38 and the like. In the present embodiment, the gas sensor 1 is arranged in an exhaust pipe of a vehicle (not shown), and is used to detect the air-fuel ratio of the internal combustion engine by detecting the oxygen concentration in exhaust gas as a detection gas using the atmosphere as a reference gas. exist figure 1 In , the upper side of the paper is referred to as the base end side, and the lower side of the paper is referred to as the distal end side.

[0023] The casing 30 is attached to a not-shown exhaust pipe. The first insulator 31 is disposed radially inside the casing 30 , and is held by t...

other Embodiment approach

[0061] In the above embodiment, the diffusion resistance layer 11 is provided at the front end of the gas sensor element 10, and the diffusion distance Ld is adjusted by forming the concave portion 112 by ultrashort laser irradiation. In other embodiments, such as Figure 8 As shown, the diffusion distance Ld can also be adjusted by removing the entire front end surface 111 of the diffusion resistance layer 11 . That is, the front end surface of the processed diffusion resistance layer 11 may be planar. Additionally, if Figure 9 As shown, the diffusion distance Ld can also be adjusted by removing the outer peripheral side of the diffusion resistance layer 11 . That is, the front end surface of the processed diffusion resistance layer 11 may be convex. exist Figure 8 as well as Figure 9 In , descriptions other than the diffusion resistance layer 11, the solid electrolyte layer 12, the first electrode 13, and the first shielding layer 17 are omitted. Additionally, if ...

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Abstract

The present invention provides a production method for a gas sensor element (10) that can detect the concentration of a specific ion on the basis of a limiting current that is the current that flows between a first electrode (13) and a second electrode (14) in accordance with the concentration difference of the specific ion. The production method comprises a temperature raising step (S102), current measurement steps (S103, S107, S109, S111), and adjustment steps (S106, S108, S110). In the temperature raising step, a heater (15) is energized, and the temperature of a solid electrolyte layer (12) is raised. In the current measurement steps, voltage is applied to the first electrode (13) and the second electrode (14), and the limiting current is measured. In the adjustment steps, an ultrashort pulse laser is used to remove a diffusion resistance layer, and a diffusion distance that is the length of an introduction passage is thereby adjusted such that the limiting current is within a final standard range.

Description

[0001] Cross References to Related Applications [0002] This application is based on the patent application No. 2018-076926 filed on April 12, 2018, the contents of which are cited here. technical field [0003] The present disclosure relates to a method of manufacturing a gas sensor element. Background technique [0004] Conventionally, a processing method of a workpiece using a laser beam is known. For example, in Patent Document 1, an ultrashort pulse laser is used to perform laser perforation of a desired removal geometry. [0005] Patent Document 1: Japanese Patent No. 6022038 [0006] However, for example, in the case of manufacturing a gas sensor element, it is desirable to process it so that physical quantities such as electric current to be detected become desired values. However, in Patent Document 1, there is no mention of any physical properties other than the geometric shape. An object of the present disclosure is to provide a method of manufacturing a gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/41
CPCG01N27/407G01N27/4065G01N27/4067G01N27/4072
Inventor 儿玉和俊
Owner DENSO CORP
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