CN2469194Y - Signal transmission device for oxygen-sensing thin-film resistance type air-fuel ratio sensor - Google Patents
Signal transmission device for oxygen-sensing thin-film resistance type air-fuel ratio sensor Download PDFInfo
- Publication number
- CN2469194Y CN2469194Y CN 01205965 CN01205965U CN2469194Y CN 2469194 Y CN2469194 Y CN 2469194Y CN 01205965 CN01205965 CN 01205965 CN 01205965 U CN01205965 U CN 01205965U CN 2469194 Y CN2469194 Y CN 2469194Y
- Authority
- CN
- China
- Prior art keywords
- fuel ratio
- ratio sensor
- comparator
- resistance
- sensing thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a signal converter of an oxygen sensing thin film resistor air-fuel ratio sensor. The signal converter mainly comprises a sampling circuit, a reference voltage generating circuit, an uplink detained comparator and an output circuit. The working principle of the utility model is as follows: according to the change in A/F, the turnover of the uplink detained voltage comparator is completed to transmit high and low voltage signal to the ECU of the automobile electronic fuel inject system. The utility model has the advantages of simple structure, low cost, and constitutes a resistor air-fuel ratio sensor with oxygen sensing thin film, and can accurately and reliably realize the motoring of the air-fuel ratio when applied to the automobile electronic fuel inject system.
Description
The utility model relates to a kind of signal transmitting device of oxygen sensitive film resistor-type air-fuel ratio sensor.The signal transmitting device that belongs to the air-fuel ratio sensor that is applied to automobile electronic fuel oil jet system.
At present, developed country has all installed air fuel ratio (A/F) sensor on automobile, with the exhaust emissions characteristic of its Control of Automobile.Employed A/F sensor all belongs to the concentration cell type, and the signal that the central unit (ECU) of this type sensor in automobile electronic fuel oil jet system provides is the voltage signal that changes with A/F.Along with China to the putting more effort of environment protection treating work, the emission performance of Control of Automobile tail gas is put into the first work with standing in the breach.University Of Tianjin has developed out a kind of oxygen sensitive film for this reason.The resistance value of this oxygen sensitive film by a few K Ω to a few M Ω, excursion is bigger, make the resistor-type air-fuel ratio sensor if adopt this oxygen sensitive film, implement Control of Automobile exhaust emissions characteristic, also must prepare the signal transmitting device that an energy changes oxygen sensitive film resistance with A/F value converts voltage signal to and flows to ECU in the electric injection system of automobile.
The purpose of this utility model is to provide a kind of signal transmitting device of oxygen sensitive film resistor-type air-fuel ratio sensor.This transmitter converts voltage signal to by the value that oxygen sensitive film resistance is changed with A/F and flows to ECU in the electric injection system, thus guarantee electric injection system accurately, reliably monitoring A/F, optimize the exhaust emissions of automobile.
For achieving the above object, the utility model is made of following circuit to be realized.Equivalent resistance R by oxygen sensitive film
xAnd R
1The sample resistance series connection constitutes sample circuit, by R
4And R
5Series connection constitutes reference voltage generating circuit, by R
2, R
3, R
6Constitute up slow comparator with voltage comparator A, by R
7And R
8Constitute output circuit.It is characterized in that R
1And R
5Anode link to each other R with the positive and negative input end of voltage comparator A respectively
2And R
3The positive-feedback circuit that constitutes is connected in the negative input end of voltage comparator A, R
2With R
3The ratio of resistance be 1.0～0.1, and R
2With R
3The resistance sum is less than 15K Ω.
Below in conjunction with accompanying drawing the utility model is further described.
Accompanying drawing is circuit theory diagrams of the present utility model.
In the accompanying drawings, V
+Be the power supply voltage of transmitter, R
xBe the equivalent resistance of oxygen sensitive film, R
1, R
4, R
5, R
6, R
7, R
8Be fixed resistance, R
2And R
3Be feedback resistance, A is a voltage comparator, R
1The voltage note at two ends is made V
1, R
5The voltage note at two ends is made V
2, the voltage of comparator A output is V
3, the output voltage that mates with ECU is V
0
Working principle of the present utility model is as follows: when A/F increases, and V
1Descend; If V
1＜V
2, V then
3Be low level, V
0It also is low level; When A/F diminishes, V
1Increase V
3Also increase, through R
3And R
2Feeder loop makes V again
2Increase, if V
2Still be in the CLV ceiling limit value of establishing less than giving, then comparator does not overturn; When being satisfied with V
1＞V
2The time, comparator upset, V
3When becoming high level, V
0Also export high level thereupon; The above-mentioned mutual conversion of low high level has reflected the oxidation of oxygen sensitive film and the transformation of reducing condition, reflects that promptly the resistance of oxygen sensitive film increases and the minimizing change procedure.
It is simple to the utlity model has circuit structure, characteristics cheap for manufacturing cost. The resistor-type sky that consists of with oxygen sensitive film fires Ratio sensor is used for automobile electronic fuel oil jet system, can accurately, reliably realize the monitoring of air-fuel ratio.
Claims (1)
1, a kind of signal transmitting device of oxygen sensitive film resistor-type air-fuel ratio sensor, this signal transmitting device is by the equivalent resistance R of oxygen sensitive film
xAnd R
1The sample resistance series connection constitutes sample circuit, by R
4And R
5Series connection constitutes reference voltage generating circuit, by R
2, R
3, R
6Constitute up slow comparator with voltage comparator A, by R
7And R
8Constitute output circuit, it is characterized in that: R
1And R
5Anode link to each other R with the positive and negative input end of voltage comparator A respectively
2And R
3The positive-feedback circuit that constitutes is connected in the negative input end of voltage comparator A, R
2With R
3The ratio of resistance be 1.0～0.1, and R
2With R
3The resistance sum is less than 15K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01205965 CN2469194Y (en) | 2001-04-02 | 2001-04-02 | Signal transmission device for oxygen-sensing thin-film resistance type air-fuel ratio sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01205965 CN2469194Y (en) | 2001-04-02 | 2001-04-02 | Signal transmission device for oxygen-sensing thin-film resistance type air-fuel ratio sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2469194Y true CN2469194Y (en) | 2002-01-02 |
Family
ID=33626689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01205965 Expired - Fee Related CN2469194Y (en) | 2001-04-02 | 2001-04-02 | Signal transmission device for oxygen-sensing thin-film resistance type air-fuel ratio sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2469194Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407244C (en) * | 2002-01-18 | 2008-07-30 | 恩德莱斯和豪瑟尔两合公司 | Sensor arrangement |
| CN108151771A (en) * | 2017-12-20 | 2018-06-12 | 哈尔滨广瀚燃气轮机有限公司 | A kind of gas turbine throttle position transmitter |
-
2001
- 2001-04-02 CN CN 01205965 patent/CN2469194Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407244C (en) * | 2002-01-18 | 2008-07-30 | 恩德莱斯和豪瑟尔两合公司 | Sensor arrangement |
| CN108151771A (en) * | 2017-12-20 | 2018-06-12 | 哈尔滨广瀚燃气轮机有限公司 | A kind of gas turbine throttle position transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |