CN210690468U - Wide-area oxygen sensor - Google Patents
Wide-area oxygen sensor Download PDFInfo
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- CN210690468U CN210690468U CN201921376301.9U CN201921376301U CN210690468U CN 210690468 U CN210690468 U CN 210690468U CN 201921376301 U CN201921376301 U CN 201921376301U CN 210690468 U CN210690468 U CN 210690468U
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Abstract
The utility model relates to a wide region oxygen sensor, including pump battery, induction battery, base member layer and the zone of heating that from top to bottom stacks gradually and sets up, the diffusion barrier has between pump battery and the induction battery, pump battery top has the protective layer, pump battery includes pump battery outer electrode, pump battery inner electrode and is located pump battery inside, the pump battery electrolyte layer between the outer electrode, induction battery includes induction battery outer electrode, induction battery inner electrode and is located the induction battery inside, the induction battery electrolyte layer between the outer electrode, the zone of heating has a heater; the inner electrode and the outer electrode of the pump battery are arranged right opposite to the center of the heater, and the inner electrode and the outer electrode of the induction battery are biased towards the head part or the tail part of the heater, so that the internal resistance of the induction battery is adjusted under the condition that the electrolyte material is unchanged.
Description
Technical Field
The utility model relates to a sensor technical field specifically relates to a wide region oxygen sensor.
Background
In combustion control of an engine, oxygen content in exhaust gas is mostly detected through an oxygen sensor, and the oxygen content is used as a feedback signal to control fuel injection quantity of the engine so as to control combustion and control contents of CO and HC in the exhaust gas, so that the wide-range oxygen sensor is an important sensor in an engine control system.
The working principle of the current five-wire wide-area oxygen sensor is shown in the attached figure 1: the signal part of the five-wire wide-area oxygen sensor consists of a pump battery 1 ' (the pump battery 1 ' consists of a pump battery outer electrode 10 ', a pump battery inner electrode 11 ' and a pump battery electrolyte layer 12 ' in the middle) and an induction battery 2 ' (the induction battery 2 ' consists of an induction battery outer electrode 20 ', an induction battery inner electrode 21 ' and an induction battery electrolyte layer 22 ' in the middle), and the two batteries are separated by a porous diffusion layer 3 '. When the waste gas enters the detection cavity 30 'from the porous diffusion layer 3', an induced voltage Un is generated between the external electrode 20 'of the induction cell and the internal electrode 21' of the induction cell, and then the controller enables the Un and the standard voltage UrefAnd controlling the pump cell 1' to pump oxygen in or out of the detection chamber so as to enable the gas concentration of the detection chamber to reach a theoretical air-fuel ratio state. When the test atmosphere is a lean-burn system, i.e. lambda>1, Un<UrefThe pump current is in the same direction as Ip in fig. 1, and the pump cell 1' will have excess O2Pumping out from the test chamber; when the test atmosphere is a rich burn system, i.e. lambda<When 1, Un > UrefPump current changes direction to pump O2Pumping from the external environment into the detection chamber; when the test atmosphere is theoretical air-fuel ratio, i.e., λ ═ 1, there is no O2Ip ═ 0, pumped in or out. Due to the restriction of the diffusion layer, a limiting current Ip is generated during the pumping in or out of oxygen, and Ip is proportional to the oxygen concentration, so that the air-fuel ratio and limiting current relationship shown in fig. 2 can be obtained.
The conventional five wire wide area oxygen sensor itself has a heater 40' for providing heat to the signal portion. In order to improve the detection precision of the signal part, the wide-area sensor has strict temperature control, and the current main method for realizing temperature control of the wide-area sensor is as follows: the controller used with the sensor realizes temperature control by monitoring the internal resistance of the sensing battery 2', which requires that the curve of the internal resistance and the temperature of the sensing battery of the sensor conforms to the parameter requirements of the controller. The internal resistance of the induction battery is mainly determined by an electrolyte material and a battery structure, the electrolyte material of the existing induction battery is a zirconia electrolyte, the optimal working temperature of the zirconia electrolyte is about 780 ℃, the temperature control parameters of five-wire wide-range products in the current market are mainly two, and firstly, 780 ℃ corresponds to the internal resistance of the induction battery to be 75 ohms; and the other is that the internal resistance of the induction battery is 300 omega at 780 ℃. In the prior art, the adjustment of the internal resistance of the induction battery is realized by changing an electrolyte material, but the change of the electrolyte material possibly causes the increase of the interface resistance of an electrode and the electrolyte and influences the normal output of an electric signal; but also can affect the cofiring performance of the zirconia and the alumina ceramics, so that the product has cracks.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a wide region oxygen sensor to realize getting off the internal resistance of adjustment induction battery under the unchangeable condition of electrolyte material.
The specific scheme is as follows:
a wide-area oxygen sensor comprises a pump battery, an induction battery, a base layer and a heating layer which are sequentially stacked from top to bottom, wherein a diffusion layer is arranged between the pump battery and the induction battery, a protective layer is arranged above the pump battery, the pump battery comprises a pump battery outer electrode, a pump battery inner electrode and a pump battery electrolyte layer which is positioned between the pump battery inner electrode and the pump battery outer electrode, the induction battery comprises an induction battery outer electrode, an induction battery inner electrode and an induction battery electrolyte layer which is positioned between the induction battery inner electrode and the induction battery outer electrode, and a heater is arranged in the heating layer; the inner electrode and the outer electrode of the pump battery are arranged right opposite to the center of the heater, and the inner electrode and the outer electrode of the induction battery are biased towards the head or the tail of the heater.
Furthermore, the heater comprises two U-shaped heating parts which are arranged in parallel, openings of the two U-shaped heating parts are arranged in the same direction, and inner electrodes and outer electrodes of the induction battery are opposite to a gap between the two U-shaped heating parts.
Furthermore, the inner electrode and the outer electrode of the induction battery are both strip-shaped electrodes.
Furthermore, the diffusion layer between the pump cell and the induction cell comprises a filling base layer and a porous diffusion layer, the porous diffusion layer is located right above the heater, other areas between the pump cell and the induction cell except the area where the porous diffusion layer is located are filled with the filling base layer, and the porous diffusion layer is simultaneously used as a detection cavity in the wide-area oxygen sensor.
Furthermore, the base layer comprises a first aluminum oxide base layer, a second aluminum oxide base layer, a zirconium oxide base layer and a third aluminum oxide base layer which are sequentially stacked from top to bottom.
Further, the pump cell electrolyte layer and the induction cell electrolyte layer are all YSZ electrolyte layers.
The utility model provides a wide region oxygen sensor compares with prior art and has following advantage: the utility model provides a wide region oxygen sensor can reach the purpose of adjustment response internal resistance size through the position relation who changes the inside and outside electrode and the heater of response battery under the condition that does not change electrolyte material and heater design, only changes the relative position of the internal and external electrode and the heater of response battery moreover, and the internal and external electrode of pump battery still is located the heater central point and puts, has guaranteed the normal output of pump battery current signal. Therefore, the wide-area oxygen sensor can realize flexible adjustment of the temperature-induction internal resistance curve and has simple structure and process.
Drawings
Fig. 1 shows a schematic diagram of the operation of a wide-area oxygen sensor.
Fig. 2 shows a graph of air-fuel ratio versus limiting current.
Fig. 3 shows an explosion diagram of the wide-area oxygen sensor provided by the present invention.
Fig. 4 is a diagram showing the positional relationship between the inner and outer electrodes of the prior art induction cell and the heater.
Fig. 5 is a diagram showing a positional relationship of the inner and outer electrodes of the induction cell in the wide-area oxygen sensor biased toward the head of the heater.
Fig. 6 shows a cross-sectional view of the inner and outer electrodes of the induction cell in the wide-area oxygen sensor biased toward the head of the heater.
Fig. 7 is a diagram showing the position relationship of the inner and outer electrodes of the induction cell in the wide-area oxygen sensor biased toward the tail of the heater.
Fig. 8 shows a cross-sectional view of the inner and outer electrodes of the induction cell in the wide-area oxygen sensor biased toward the tail of the heater.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
As shown in fig. 3 to 5, the present embodiment provides a wide-area oxygen sensor, which includes a pump cell 1, an induction cell 2, a substrate layer 5 and a heating layer 4, which are stacked in this order from top to bottom, wherein the pump cell 1 and the induction cell 2 are separated by a diffusion layer 3, and a protective layer 6 is provided on the upper surface of the pump cell 1.
In particular, the pump cell 1 comprises a pump cell outer electrode 10, a pump cell inner electrode 11 and a pump cell electrolyte layer 12 between the pump cell outer electrode 10 and the pump cell inner electrode 11. The induction cell 2 includes an outer induction cell electrode 20, an inner induction cell electrode 21, and an electrolyte layer 22 between the outer induction cell electrode 20 and the inner induction cell electrode 21. The inside-outside positional relationship in this embodiment is defined by the upper side being the outside and the lower side being the inside. The pump cell electrolyte layer 12 and the sense cell electrolyte layer 22 in this embodiment are all YSZ (yttria stabilized zirconia) electrolyte thin films.
The base layer 5 comprises a first alumina base layer 50, a second alumina base layer 51, a zirconia base layer 52 and a third alumina base layer 53 which are sequentially stacked from top to bottom, wherein the zirconia base layer and the zirconia electrolyte layer form a symmetrical structure, and the structure can effectively prevent the product from being bent.
The heating layer 4 includes a fourth alumina base layer 41, and a heater 40 and a heater lead 42 between the fourth alumina base layer 41 and the third alumina base layer 53. Referring to fig. 4, the temperature of each portion of the heater 40 in the prior art is not uniform, and the temperature is gradually decreased from the center of the heater 40 to the head portion, which is a free end in fig. 4, toward the tail portion, which is a side connected to the heater lead 42. The inner and outer electrodes of the pump cell and the inner and outer electrodes of the induction cell in the prior art are aligned with the center of the heater 40. Referring to fig. 5 to 8, the inner and outer electrodes of the induction cell 2 in this embodiment are located at the center of the heater 40 in the front-rear direction, but are offset toward the head or the tail of the heater 40 in the left-right direction. When the inner and outer electrodes of the induction battery 2 are biased towards the head of the heater, the temperature is higher, and the induction internal resistance is reduced; on the contrary, when the inner and outer electrodes of the induction cell 2 are biased towards the tail of the heater, the temperature is lower, and the induction internal resistance is increased, so that the purpose of adjusting the induction internal resistance can be achieved under the condition of not changing the design of the electrolyte material and the heater. In addition, in the embodiment, only the relative positions of the inner electrode and the outer electrode of the induction battery and the heater are changed, and the inner electrode and the outer electrode of the pump battery are still located in the central position of the heater, so that the current signals of the pump battery are ensured to be normally output.
The diffusion layer 3 between the pump cell 1 and the induction cell 2 comprises a filling substrate layer 31 and a porous diffusion layer 32, wherein the porous diffusion layer 32 is located right above the heater 40, the filling substrate layer 31 fills other areas except the area where the porous diffusion layer 32 is located so as to make up thickness variation caused by the porous diffusion layer 32, the porous diffusion layer 32 is simultaneously used as a detection cavity in the wide-area oxygen sensor, the porous diffusion layer 32 can be embedded between the pump cell inner electrode 11 and the induction cell outer electrode 20 by adopting a lamination process, and compared with the existing printing porous process, the wide-area oxygen sensor has the advantages of being simple in operation and good in product limiting current consistency. The protective layer 6 includes a porous protective layer 60 and a base protective layer 61, wherein the porous protective layer is located directly above the porous diffusion layer 32.
The protective layer 6 is also provided with an electrode pin 70 connected with the electrode of the pump cell 1 and an electrode pin 70 connected with the electrode of the induction cell 2, correspondingly, the fourth alumina base layer 41 is provided with a heater pin 71 connected with the heater lead 42, and the electrode pin 70 and the heater pin 71 are both used for connecting with an external circuit.
Referring to fig. 3 to 8, as a preferred mode, the heater 40 includes two U-shaped heating portions arranged in parallel, and the openings of the two U-shaped heating portions are arranged in the same direction, and the inner and outer electrodes of the induction cell 2 are aligned with the gap between the two U-shaped heating portions. Preferably, the inner and outer electrodes of the induction cell 2 are both strip-shaped electrodes, so that the projections of the inner and outer electrodes of the induction cell 2 are both located in the gap between the two U-shaped heating portions.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A wide-area oxygen sensor, characterized by: the pump battery comprises a pump battery, an induction battery, a base layer and a heating layer which are sequentially stacked from top to bottom, wherein a diffusion layer is arranged between the pump battery and the induction battery, a protective layer is arranged above the pump battery, the pump battery comprises a pump battery outer electrode, a pump battery inner electrode and a pump battery electrolyte layer which is positioned between the pump battery inner electrode and the pump battery outer electrode, the induction battery comprises an induction battery outer electrode, an induction battery inner electrode and an induction battery electrolyte layer which is positioned between the induction battery inner electrode and the induction battery outer electrode, and a heater is arranged in the heating layer; the inner electrode and the outer electrode of the pump battery are arranged right opposite to the center of the heater, and the inner electrode and the outer electrode of the induction battery are biased towards the head or the tail of the heater.
2. The wide-area oxygen sensor of claim 1, wherein: the heater comprises two U-shaped heating parts which are arranged in parallel, openings of the two U-shaped heating parts are arranged in the same direction, and inner electrodes and outer electrodes of the induction battery are opposite to a gap between the two U-shaped heating parts.
3. The wide-area oxygen sensor of claim 2, wherein: the inner electrode and the outer electrode of the induction battery are both strip-shaped electrodes.
4. The wide-area oxygen sensor of claim 1, wherein: the diffusion layer between the pump battery and the induction battery comprises a filling base layer and a porous diffusion layer, the porous diffusion layer is located right above the heater, other areas between the pump battery and the induction battery except the area where the porous diffusion layer is located are filled with the filling base layer, and the porous diffusion layer is simultaneously used as a detection cavity in the wide-area oxygen sensor.
5. The wide-area oxygen sensor of claim 1, wherein: the base layer comprises a first aluminum oxide base layer, a second aluminum oxide base layer, a zirconium oxide base layer and a third aluminum oxide base layer which are sequentially stacked from top to bottom.
6. The wide-area oxygen sensor of claim 1, wherein: and the pump battery electrolyte layer and the induction battery electrolyte layer are all YSZ electrolyte layers.
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| CN201921376301.9U CN210690468U (en) | 2019-08-23 | 2019-08-23 | Wide-area oxygen sensor |
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| CN201921376301.9U CN210690468U (en) | 2019-08-23 | 2019-08-23 | Wide-area oxygen sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946043A (en) * | 2021-02-02 | 2021-06-11 | 浙江百岸科技有限公司 | Calibration-free wide-area oxygen sensor and detection method thereof |
| CN115060778A (en) * | 2022-06-13 | 2022-09-16 | 明石创新(烟台)微纳传感技术研究院有限公司 | Wide-area oxygen sensor and preparation method thereof |
| CN117233233A (en) * | 2023-11-14 | 2023-12-15 | 苏州工业园区福特斯汽车电子有限公司 | Intelligent wide-area five-wire oxygen sensor chip and manufacturing method thereof |
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2019
- 2019-08-23 CN CN201921376301.9U patent/CN210690468U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946043A (en) * | 2021-02-02 | 2021-06-11 | 浙江百岸科技有限公司 | Calibration-free wide-area oxygen sensor and detection method thereof |
| CN112946043B (en) * | 2021-02-02 | 2023-08-29 | 浙江百岸科技有限公司 | Calibration-free wide-area oxygen sensor and detection method thereof |
| CN115060778A (en) * | 2022-06-13 | 2022-09-16 | 明石创新(烟台)微纳传感技术研究院有限公司 | Wide-area oxygen sensor and preparation method thereof |
| CN115060778B (en) * | 2022-06-13 | 2023-05-12 | 明石创新(烟台)微纳传感技术研究院有限公司 | Wide-area oxygen sensor and preparation method thereof |
| CN117233233A (en) * | 2023-11-14 | 2023-12-15 | 苏州工业园区福特斯汽车电子有限公司 | Intelligent wide-area five-wire oxygen sensor chip and manufacturing method thereof |
| CN117233233B (en) * | 2023-11-14 | 2024-01-30 | 苏州工业园区福特斯汽车电子有限公司 | Intelligent wide-area five-wire oxygen sensor chip and manufacturing method thereof |
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