CN102262119B - Lambda sensor - Google Patents
Lambda sensor Download PDFInfo
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- CN102262119B CN102262119B CN201010187915.XA CN201010187915A CN102262119B CN 102262119 B CN102262119 B CN 102262119B CN 201010187915 A CN201010187915 A CN 201010187915A CN 102262119 B CN102262119 B CN 102262119B
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- lambda sensor
- electrode interface
- negative electrode
- hole
- insulating body
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Abstract
The invention discloses a lambda sensor, characterized by that: an alumina insulating substrate is provided with an upturned through hole and an air-filled cavity groove positioned below the through hole and communicated with the through hole; a zirconia detection carrier is enclosedly arranged on the through hole of the insulating substrate, a negative electrode interface is arranged on the upper surface of the detection carrier to be in contact with gas to be detected, and a positive electrode interface is arranged on the lower surface of the detection carrier to be in contact with gas in the through hole; a ventilating part is arranged on a shield corresponding to the negative electrode interface to allow the gas to be detected to pass through; the oxygen contents of the gas to be detected and air are resolved into the potential difference to allow the positive electrode interface and the negative electrode interface to transmit voltage signals through the detection carrier, so as to detect the concentration of oxygen of the gas to be detected. The lambda sensor disclosed herein can reduce the process, reduce the application amount of zirconia material, reduce production cost, and improve integral intensity of the structure, with durable service.
Description
Technical field
The present invention relates to a kind of Lambda sensor, espespecially a kind of insulating carrier local that utilizes combines the bar chip Lambda sensor detecting carrier.
Background technology
Lambda sensor (or claim oxygen checking device, O
2sensor) be usually located in the oil gas inlet end of automobile or locomotive engine or the gas outlet of engine by group and see, in order to the oxygen level of oil gas (air and the fuel oil) mixing ratio (or claiming air-fuel ratio) or waste emission end that detect engine air admittance end.In other words, namely use Lambda sensor detects the oxygen concentration numerical value in test gas (oil gas or discarded), so that supply engine control unit (Engine Control Unit, ECU) adjust optimal air-fuel ratio, and reduce the discharge capacity of objectionable impurities in waste gas.
Traditional Lambda sensor can be divided into heated type and non-power hot type two kinds, and its difference is to have in perception body or without installing thermopair well heater.In the Lambda sensor design of heated type, the electrode holder of body internal solid electrolysis-type can be made to be rapidly heated to more than 350 DEG C, to detect the current potential signal of air-fuel ratio or oxygen concentration.Review the Lambda sensor of non-power hot type, can only to heat gradually electrode holder by oil gas or exhaust gas temperature, the reaction velocity therefore detecting oxygen concentration current potential signal is comparatively slow, but still can bring into normal play after engine start a period of time detect ability.
Moreover, no matter be to have or without the electrode insulation carrier all must establishing a solid electrolyte type in the Lambda sensor of heating efficiency.The typical electrode insulation carrier of tradition is with zirconia (ZrO
2) processing procedure, belong to the high-temperature oxygen perceptron of electric potential type solid electrolyte type, it is made into the electrode holder of single long shape, the chamber groove being communicated to air is formed in carrier, and be just embedded with in vivo, the metal lead wire of negative pole, and the atmosphere be formed in positive electrode interface and chamber groove, and be formed with negative electrode interface and make and exhaust gas contact, and just, electrochemical reaction is formed between negative electrode interface and solid electrolyte type Zirconia carrier, and produce magnitude of voltage, and conduct in single Zirconia carrier, in order to detect oxygen concentration or the air-fuel ratio value of test gas.
Just only having in whole carrier, negative electrode interface position periphery need produce magnitude of voltage by zirconia, the carrier location that other body part or conduction export, solid electrolyte might not be used as by zirconia, simultaneously, because the commercially available price of zirconia raw material very high, but the electrode holder in commercially available Lambda sensor only can use zirconia processing procedure solid electrolyte, to such an extent as to cause price just to hold high, production cost cannot be reduced, and zirconia material intensity difference, easy fracture damage, affect serviceable life, need to be overcome and improve.
Summary of the invention
In order to overcome above-mentioned defect, the invention provides a kind of Lambda sensor, can manufacturing cost be reduced, and improve overall construction intensity.
The present invention in order to the technical scheme solving its technical matters and adopt is:
A kind of Lambda sensor, includes:
One insulating body, have a through hole upward and to be in below this through hole and to communicate in an air chamber groove of through hole, one end of this air chamber groove offers open communication air;
One detects carrier, above the closed through hole being arranged on insulating body, the upper surface of this detection carrier is provided with negative electrode interface and negative electrode thereof, to contact test gas, the lower surface of this detection carrier is provided with positive electrode interface and positive electrode thereof, with the air in contact through hole;
One protection body, is arranged at the upper surface of insulating body, and this protection body corresponds to negative electrode interface and is provided with a ventilative position, passes through for test gas;
The oxygen level each other of such test gas and air resolves into different potentials difference, makes positive and negative electrode interface via detection carrier transmission voltage signal, to detect the oxygen concentration value of test gas.
As a further improvement on the present invention, described insulating body is made up of top plate and lower plywood pressing, to arrange through hole respectively and the air chamber groove that communicates.
As a further improvement on the present invention, described insulating body is aluminium oxide lamellar body.
As a further improvement on the present invention, described detection carrier is solid electrolyte type zirconia lamellar body, and described positive and negative electrode interface is platinum catalyst face.
As a further improvement on the present invention, described protection body is insulation lamellar body, and described ventilative position is porous breathable body.
As a further improvement on the present invention, described protection body is aluminium oxide lamellar body, and the structure that described protection body is provided with a ventilative position corresponding to negative electrode interface is: this protection body is provided with a perforate, arranges porous breathable body in this perforate.
As a further improvement on the present invention, described insulating body is below in conjunction with there being a well heater.
The invention has the beneficial effects as follows: Lambda sensor utilizes alumina insulation matrix local to detect the structure of carrier in conjunction with zirconia, processing procedure can be reduced, and reduce zirconia material use amount, reduce manufacturing cost, and improve overall construction intensity, make Lambda sensor more durable in use, and can guarantee to detect ability.
Accompanying drawing explanation
Fig. 1 is schematic perspective view of the present invention;
Fig. 2 is that the A-A of Fig. 1 is to cut-open view;
Fig. 3 is that the B-B of Fig. 1 is to cut-open view;
Fig. 4 is the perspective exploded view of Fig. 1;
Fig. 5 is the perspective exploded view looking up angle of Fig. 4;
Fig. 6 is insulating body and the stereographic map detecting carrier in Fig. 4;
[main element symbol description]
1---insulating body; 11---top plate; 12---lower plywood;
13---through hole; 14---air chamber groove; 15---opening;
2---detect carrier; 21---positive electrode interface; 22---negative electrode interface;
23---positive electrode; 24---negative electrode; 25---link;
26---link;
3---protection body; 31---ventilative position; 32---porous breathable body;
33---perforate;
4---well heater; 41---insulating body; 42---insulating body;
43---electric heating element; 44---electric heating element; 45---link;
46---link.
Embodiment
Embodiment: see shown in Fig. 1,2,3, this routine Lambda sensor is mainly set to elongate body or plane lamellar body, can group be located in automobile, the oil gas inlet end of locomotive engine or the gas outlet of engine, in order to the oxygen level of oil gas (air and the fuel oil) mixing ratio (or claiming air-fuel ratio) or toxic emission end that detect engine air admittance end.As shown in FIG., this routine Lambda sensor detects carrier 2 primarily of an insulating body 1, and combines formation successively with its positive and negative electrode interface 21,22 and one protection body 3, and insulating body 1 below can in conjunction with flat heater 4.
Visible in this illustration intention shown in Fig. 1 ~ Fig. 6, the insulating body 1 of this routine Lambda sensor can adopt aluminium oxide or alundum (Al2O3) (Al
2o
3) lamellar body, and there is the air chamber groove 14 that a through hole 13 upward and below thereof communicate, offer opening 15 by one end of air chamber groove 14 and be communicated with air.And detect carrier 2 and can adopt zirconia lamellar body, above the closed through hole 13 being arranged on insulating body 1, and the upper surface detecting carrier 2 is provided with negative electrode interface 22 and negative electrode 24 thereof, to contact test gas, positive electrode interface 21 and positive electrode 23 thereof is provided with, with the air in contact through hole in the lower surface detecting carrier 2.And protection body 3 is arranged at the upper surface of insulating body 1, and protection body 3 is provided with a ventilative position 31 corresponding to negative electrode interface 22, passes through and the negative electrode interface 22 of contact detection carrier 2 for test gas.Well heater 4 then in two relative insulating body 41,42 inside in conjunction with electric heating element 43,44, and be provided with external connection terminal 45,46.
When reality uses perception oxygen level, the zirconia wood properly test carrier 2 of Lambda sensor is under the condition of high temperature, by test gas and air each other oxygen level resolve into different potentials difference, make positive and negative electrode interface 21,22 via detection carrier 2 transmission voltage signal, with the oxygen concentration value coordinating outside relevant design to calculate test gas.Because this routine Lambda sensor utilizes alumina insulation matrix 1 local in conjunction with the frame mode of zirconia detection carrier 2, therefore, it is possible to reduction processing procedure, and reduce zirconia material use amount, reduce manufacturing cost, and improve overall construction intensity, make product more durable in use, guarantee to detect ability.
Go on to say the unitized construction of this routine Lambda sensor, as shown in figs. 1 to 6,
Insulating body 1 is set to and is made up of top plate 11 and lower plywood 12 pressing, to arrange through hole 13 respectively and the air chamber groove 14 that communicates, and the upper and lower laminate 11,12 of insulating body 1 and protection body 3 can respectively be set to aluminium oxide lamellar body, form by a firing with pressing each other.And detect carrier 2 and be set to solid electrolyte type zirconia lamellar body, and positive and negative electrode interface 21,22 is set to platinum catalyst face, and external connection terminal 25,26 can be provided with on positive and negative electrode 23,24.
Shown in Fig. 1 ~ 4, the protection body 3 of Lambda sensor can be set to insulation lamellar body, and comprehensively in conjunction with insulating body 1, and ventilative position 31 is porous breathable body 32.As shown in FIG., protection body 3 is set to aluminium oxide lamellar body equally, is provided with a perforate 33 in protection body 3, to arrange porous breathable body 32, and fires connecting shaping each other, to protect positive and negative electrode interface 21,22 and positive and negative electrode 23,24.
This routine Lambda sensor utilizes alumina insulation matrix 1 local to detect the structure of carrier 2 in conjunction with zirconia, can reduce processing procedure, and reduce zirconia material use amount, reduce manufacturing cost, and improve overall construction intensity, make product more durable in use, guarantee to detect ability.
Above illustrated embodiment is the present invention for convenience of description only; and be not in a limitative way, not from scope of the present invention, the technology personage being familiar with the industry can residing various simple and easy change and modification; or the simple equivalent of functor is replaced, and all should be included in protection domain of the presently claimed invention.
Claims (7)
1. a Lambda sensor, is characterized in that: include:
One insulating body (1), have a through hole (13) upward and be in this through hole (13) below and communicate in an air chamber groove (14) of through hole (13), one end of this air chamber groove (14) offers opening (15) and is communicated with air;
One is embedded at described insulating body court interior detection carrier (2) locally above, above the closed through hole (13) being arranged on insulating body (1), the upper surface of this detection carrier (2) is provided with negative electrode interface (22) and negative electrode (24) thereof, and the lower surface of this detection carrier (2) is provided with positive electrode interface (21) and positive electrode (23) thereof;
One protection body (3) measure-alike with described insulating body, be arranged at the upper surface of insulating body (1), this protection body (3) is provided with a ventilative position (31) identical with described clear size of opening corresponding to negative electrode interface (22), described ventilative position embeds in described protection body, passes through for test gas.
2. Lambda sensor according to claim 1, is characterized in that: described insulating body (1) is made up of top plate (11) and lower plywood (12) pressing.
3. Lambda sensor according to claim 1 and 2, is characterized in that: described insulating body (1) is aluminium oxide lamellar body.
4. Lambda sensor according to claim 3, is characterized in that: described detection carrier (2) is solid electrolyte type zirconia lamellar body, and described positive and negative electrode interface (21,22) is platinum catalyst face.
5. Lambda sensor according to claim 1 and 2, is characterized in that: described protection body (3) is insulation lamellar body, and described ventilative position (31) is porous breathable body.
6. Lambda sensor according to claim 5, it is characterized in that: described protection body (3) is aluminium oxide lamellar body, the structure that described protection body (3) is provided with a ventilative position (31) corresponding to negative electrode interface (22) is: this protection body is provided with a perforate (33), arranges porous breathable body (32) in this perforate.
7. Lambda sensor according to claim 1 and 2, is characterized in that: described insulating body (1) is below in conjunction with there being a well heater (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010187915.XA CN102262119B (en) | 2010-05-31 | 2010-05-31 | Lambda sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010187915.XA CN102262119B (en) | 2010-05-31 | 2010-05-31 | Lambda sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102262119A CN102262119A (en) | 2011-11-30 |
| CN102262119B true CN102262119B (en) | 2015-06-17 |
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ID=45008828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010187915.XA Active CN102262119B (en) | 2010-05-31 | 2010-05-31 | Lambda sensor |
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| CN (1) | CN102262119B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636527A (en) * | 2012-04-23 | 2012-08-15 | 常州联德电子有限公司 | Inlaid plate-shaped oxygen sensor and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1213582A2 (en) * | 2000-12-07 | 2002-06-12 | Denso Corporation | Gas sensing element |
| CN201724926U (en) * | 2010-05-31 | 2011-01-26 | 昆山星陶汽车电子有限公司 | Oxygen sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS613050A (en) * | 1984-06-16 | 1986-01-09 | Ngk Spark Plug Co Ltd | Detection substrate for oxygen sensor |
| JP2002174620A (en) * | 2000-12-07 | 2002-06-21 | Denso Corp | Gas sensor element and gas sensor |
| JP3931783B2 (en) * | 2001-12-12 | 2007-06-20 | 株式会社デンソー | Gas sensor element |
-
2010
- 2010-05-31 CN CN201010187915.XA patent/CN102262119B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1213582A2 (en) * | 2000-12-07 | 2002-06-12 | Denso Corporation | Gas sensing element |
| CN201724926U (en) * | 2010-05-31 | 2011-01-26 | 昆山星陶汽车电子有限公司 | Oxygen sensor |
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| Publication number | Publication date |
|---|---|
| CN102262119A (en) | 2011-11-30 |
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