CN103791968A - Temperature compensating circuit for air flow sensor - Google Patents
Temperature compensating circuit for air flow sensor Download PDFInfo
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- CN103791968A CN103791968A CN201210433574.9A CN201210433574A CN103791968A CN 103791968 A CN103791968 A CN 103791968A CN 201210433574 A CN201210433574 A CN 201210433574A CN 103791968 A CN103791968 A CN 103791968A
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- resistor
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- air flow
- flow sensor
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Abstract
The invention discloses a temperature compensating circuit for an air flow sensor. The temperature compensating circuit is characterized in that an output end of the air flow sensor is connected with a same-phase end of an operational amplifier U1 by a resistor R12, a reversed-phase end of the operational amplifier U1 is connected with output of an operational amplifier U2, a same-phase end of the operational amplifier U2 is connected with one end of a resistor R5 and one end of a resistor R6 by a resistor R7, the resistor R5 and the resistor R6 are connected with each other in parallel, the end of the resistor R5 and the end of the resistor R6 connected with the resistor R5 in parallel are further grounded via a resistor R4, the other end of the resistor R5 and the other end of the resistor R6 connected with the resistor R5 in parallel are connected with a VCC (voltage to current converter), a reversed-phase end of the operational amplifier U2 is connected with one end of a resistor R2 and one end of a resistor R3 by a resistor R8, the resistor R2 and the resistor R3 are connected with each other in parallel, the end of the resistor R2 and the end of the resistor R3 connected with the resistor R2 in parallel are further connected with the VCC by a resistor R1, the other end of the resistor R2 and the other end of the resistor R3 connected with the resistor R2 in parallel are grounded, both the resistor R3 and the resistor R5 are temperature-sensitive resistors, and output of the operational amplifier U1 is compensated final output. The temperature compensating circuit has the advantages that temperature compensation can be carried out on output of the air flow sensor, and the circuit is simple in structure and high in compensation precision, and can be configured on various air flow sensors.
Description
Technical field
The present invention relates to air flow sensor technical field, particularly a kind of temperature-compensation circuit for air flow sensor.
Background technology
Air flow sensor is one of important sensor of electronic fuel injection engine.It converts the air mass flow of suction to electric signal and delivers to ECU (Electrical Control Unit) (ECU), as determining one of baseband signal of oil spout.Electronically controlled gasoline injection engine, in order to obtain the combination gas of optium concentration under various Operation Conditions, must correctly be measured the air capacity that often sucks in a flash engine, calculates the Main Basis of (control) distributive value using this as ECU.If air flow sensor or circuit break down, ECU can not get correct air inflow signal, just can not normally carry out the control of distributive value, will cause combination gas overrich or excessively rare, makes engine running undesired.The air flow sensor of electronically controlled petrol injection system has multiple pattern, and at present can be divided into blade (wing plate) formula, amount core formula, hot-wire, hot diaphragm type, karman vortex by its structural shape rotating etc. several for common air flow sensor.But these common sensors all fail to consider the impact of temperature, and along with temperature variation, the output of sensor also can correspondingly change, and causes actual value different from measured value, therefore needs it to carry out temperature compensation.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of temperature-compensation circuit for air flow sensor.
To achieve these goals, the technical solution used in the present invention is:
A kind of temperature-compensation circuit for air flow sensor, the output terminal of air flow sensor connects the in-phase end of amplifier U1 through resistance R 12, the output of the anti-phase termination amplifier U2 of amplifier U1, the in-phase end of amplifier U2 connects one end of resistance R in parallel 5 and resistance R 6 by resistance R 7, resistance R 5 in parallel and this end of resistance R 6 are also by resistance R 4 ground connection, resistance R 5 in parallel and another termination VCC of resistance R 6, the end of oppisite phase of amplifier U2 connects one end of resistance R in parallel 2 and resistance R 3 by resistance R 8, resistance R 2 in parallel and this end of resistance R 3 also meet VCC by resistance R 1, resistance R 2 in parallel and the other end ground connection of resistance R 3, wherein resistance R 3 and resistance R 5 are thermo-sensitive resistor, the output of amplifier U1 is finally exported after being compensation.
Compared with prior art, the present invention can make temperature compensation to the output of air flow sensor, and circuit structure is simple, and compensation precision is high, configurablely in various air flow sensor, uses.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is carried out to more detailed explanation.
As shown in the figure, the present invention is a kind of temperature-compensation circuit for air flow sensor, the output terminal of air flow sensor connects the in-phase end of amplifier U1 through resistance R 12, the output of the anti-phase termination amplifier U2 of amplifier U1, the in-phase end of amplifier U2 connects one end of resistance R in parallel 5 and resistance R 6 by resistance R 7, resistance R 5 in parallel and this end of resistance R 6 are also by resistance R 4 ground connection, resistance R 5 in parallel and another termination VCC of resistance R 6, the end of oppisite phase of amplifier U2 connects one end of resistance R in parallel 2 and resistance R 3 by resistance R 8, resistance R 2 in parallel and this end of resistance R 3 also meet VCC by resistance R 1, resistance R 2 in parallel and the other end ground connection of resistance R 3, wherein resistance R 3 and resistance R 5 are thermo-sensitive resistor, the output of amplifier U1 is finally exported after being compensation.
Differential amplification is carried out in the two-way output with thermo-sensitive resistor by amplifier U2, and output valve is as the temperature-compensated voltage of air flow sensor.
Claims (1)
1. the temperature-compensation circuit for air flow sensor, it is characterized in that, the output terminal of air flow sensor connects the in-phase end of amplifier U1 through resistance R 12, the output of the anti-phase termination amplifier U2 of amplifier U1, the in-phase end of amplifier U2 connects one end of resistance R in parallel 5 and resistance R 6 by resistance R 7, resistance R 5 in parallel and this end of resistance R 6 are also by resistance R 4 ground connection, resistance R 5 in parallel and another termination VCC of resistance R 6, the end of oppisite phase of amplifier U2 connects one end of resistance R in parallel 2 and resistance R 3 by resistance R 8, resistance R 2 in parallel and this end of resistance R 3 also meet VCC by resistance R 1, resistance R 2 in parallel and the other end ground connection of resistance R 3, wherein resistance R 3 and resistance R 5 are thermo-sensitive resistor, the output of amplifier U1 is finally exported after being compensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210433574.9A CN103791968A (en) | 2012-11-02 | 2012-11-02 | Temperature compensating circuit for air flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210433574.9A CN103791968A (en) | 2012-11-02 | 2012-11-02 | Temperature compensating circuit for air flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103791968A true CN103791968A (en) | 2014-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210433574.9A Pending CN103791968A (en) | 2012-11-02 | 2012-11-02 | Temperature compensating circuit for air flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103791968A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106098769A (en) * | 2015-04-27 | 2016-11-09 | 电力集成公司 | Current sense ratio compensates |
| CN109310291A (en) * | 2016-06-10 | 2019-02-05 | 奥林巴斯株式会社 | Endoscope and endoscope apparatus |
-
2012
- 2012-11-02 CN CN201210433574.9A patent/CN103791968A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106098769A (en) * | 2015-04-27 | 2016-11-09 | 电力集成公司 | Current sense ratio compensates |
| CN106098769B (en) * | 2015-04-27 | 2021-05-04 | 电力集成公司 | Current sense ratio compensation |
| CN109310291A (en) * | 2016-06-10 | 2019-02-05 | 奥林巴斯株式会社 | Endoscope and endoscope apparatus |
| CN109310291B (en) * | 2016-06-10 | 2021-06-15 | 奥林巴斯株式会社 | Endoscope and endoscope device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140514 |