CN104006903A - Method for detecting temperature sensor on engine inlet port - Google Patents
Method for detecting temperature sensor on engine inlet port Download PDFInfo
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- CN104006903A CN104006903A CN201410263919.XA CN201410263919A CN104006903A CN 104006903 A CN104006903 A CN 104006903A CN 201410263919 A CN201410263919 A CN 201410263919A CN 104006903 A CN104006903 A CN 104006903A
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- voltage
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- temperature sensor
- fixed value
- thermal resistance
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- 238000000034 method Methods 0.000 title abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The invention provides a method for detecting a temperature sensor on an engine inlet port. The method is high in processing speed and measuring accuracy and small in measuring error. The method is implemented through the following technical scheme that a measured thermal resistor RX of the temperature sensor on the engine inlet port and a fixed value resistor R0 are connected in a detection circuit in series, the voltage U0 across the two ends of the fixed value resistor R0 is introduced into the normally-closed end of a multiplexer switch IC1, the voltage UX across the two ends of the measured thermal resistor RX is then introduced into the normally-open end of the multiplexer switch IC1, an output signal is amplified to the A/D converter recognition voltage U1 through an operational amplifier IC2, the output voltage U1of the IC2 is determined through a selection signal S of the input end of the multiplexer switch IC1, the engine electronic controller determines the read U1 is U0 or UX according to the magnitude of the selection signal S, and a CPU of the engine electronic controller carries out calculation to obtain the resistance value of the thermal resistor RX at the moment.
Description
Technical field
The present invention relates to a kind of detection method that is mainly used in engine intake temperature.
Background technology
In engine electronic control system device, engine intake temperature T 1 is as the important parameter of engine control regularity, the N1 limits value of engine intake temperature value when directly affecting the acceleration limit value, surge maximum constraints flow, flame-out minimum limit flow of acceleration and deceleration process and two work.Therefore, engine intake temperature measurement accuracy will produce larger impact to the control law of engine.Detect the installation of sensors of engine intake temperature at the air intake opening front end of engine, be generally PT100 thermal resistance, temperature survey is to adopt to apply constant current source to tested thermal resistance mostly, gather the magnitude of voltage at thermal resistance two ends, by conversion, obtain the resistance value of this thermal resistance, then by interpolation, obtain current temperature value.Measure like this temperature value of gained relevant with the precision of constant current source, if constant current source changes fluctuation greatly with ambient temperature, measure resulting temperature value and also can fluctuate with ambient temperature, thus the measuring error of causing.
Summary of the invention
For fear of ambient temperature, change the particularly impact of constant current source of metering circuit, the invention provides a kind of processing speed fast, measuring accuracy is high, and measuring error is little, the detection method to engine intake temperature.
Above-mentioned purpose of the present invention can reach by following measures, and a kind of detection method of engine intake temperature sensor is characterized in that comprising the steps: by the tested thermal resistance R of engine intake temperature sensor
xwith fixed value resistance R
0be connected in testing circuit, fixed value resistance R
0both end voltage U
0introduce the normal-closed end of multidiameter option switch IC1, then by tested thermal resistance R
xboth end voltage U
xintroduce the Chang Kaiduan of multidiameter option switch IC1, output signal is amplified to A/D converter identification voltage U 1 by operational amplifier IC2, selection signal S by multidiameter option switch IC1 input end determines IC2 Voltage-output U1, and engine electronic control system device determines that according to the height of selecting signal S the U1 reading is U
0or U
x, the CPU of engine electronic control system device calculates and obtains now thermal resistance R
xresistance.
The present invention has following beneficial effect than prior art.
Measurement of the present invention and processing speed are fast, and measuring accuracy is high, and measuring error is little, real-time good.Experiment shows, to temperature sensor measurement error, is only 0.5 ℃, can be applicable to, in aeromotor full authority digital electronic control (FADEC) system, have important practical value.
By this measuring technique of the present invention, can reduce measuring error metering circuit being caused due to environment temperature.
Accompanying drawing explanation
The a part of accompanying drawing that forms the application is used for providing a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the testing circuit principle of work schematic diagram of the present invention to engine intake temperature sensor.
In figure: R
xfor tested thermal resistance, R
0for fixed value resistance, U is working power, and S is for selecting signal, and IC1 is multidiameter option switch, and IC2 is precision operational-amplifier, and U1 is output voltage values.
Embodiment
In Fig. 1, according to the present invention, by the tested thermal resistance R of engine intake temperature sensor PT100
xwith fixed value resistance R
0be connected in testing circuit tested thermal resistance R
xwith fixed value resistance R
0be connected on metering circuit power supply and earth terminal.Testing circuit comprises by tested thermal resistance R
xwith fixed value resistance R
0between series connection contact and precision operational-amplifier IC2, enter multidiameter option switch IC1, and be connected electrically in the processor CPU on precision operational-amplifier IC2 output terminal.During measurement, fixed value resistance R
0both end voltage U
0introduce the normal-closed end of multidiameter option switch IC1, then by tested thermal resistance R
xboth end voltage U
xintroduce the Chang Kaiduan of multidiameter option switch IC1, output signal is amplified to A/D converter identification voltage U 1 by precision operational-amplifier IC2, selection signal S by multidiameter option switch IC1 input end determines IC2 Voltage-output U1, and the U1 that engine electronic control system device reads according to the height of selecting signal S is U
0or U
x, the CPU of engine electronic control system device calculates the thermal resistance resistance R obtaining now
x.
According to the present invention, can adopt a temperature coefficient to reach the fixed value resistance R of 5ppm
0with tested thermal resistance R
xseries connection, engine electronic control system device is measured respectively fixed value resistance R
0magnitude of voltage U
0with thermal resistance R
xmagnitude of voltage U
x, known according to Ohm law:
Because the electric current by each resistance in series circuit is consistent, i.e. I
x=I
0, have
From above formula, the resistance of thermal resistance and metering circuit independent of power voltage, its measuring error is only relevant with the precision of fixed value resistance, is subject to the impact of environment temperature also only relevant with the temperature coefficient of fixed value resistance, select the fixed value resistance R that temperature coefficient is 5ppm here,
0, the passage precision of measurement can reach 1%.
Above-described is only the preferred embodiments of the present invention.It should be pointed out that for the person of ordinary skill of the art, under the premise without departing from the principles of the invention, can also make some distortion and improvement, these changes and change should be considered as belonging to protection scope of the present invention.
Claims (3)
1. a detection method for engine intake temperature sensor, is characterized in that comprising the steps: the tested thermal resistance R by engine intake temperature sensor
xwith fixed value resistance R
0be connected in testing circuit, fixed value resistance R
0both end voltage U
0introduce the normal-closed end of multidiameter option switch IC1, then by tested thermal resistance R
xboth end voltage U
xintroduce the Chang Kaiduan of multidiameter option switch IC1, output signal is amplified to A/D converter identification voltage U 1 by operational amplifier IC2, selection signal S by multidiameter option switch IC1 input end determines IC2 Voltage-output U1, and engine electronic control system device determines that according to the height of selecting signal S the U1 reading is U
0or U
x, the CPU of engine electronic control system device calculates and obtains now thermal resistance R
xresistance.
2. the detection method of engine intake temperature sensor as claimed in claim 1, is characterized in that: tested thermal resistance R
xwith fixed value resistance R
0be connected on metering circuit power supply and earth terminal.
3. the detection method of engine intake temperature sensor as claimed in claim 1, is characterized in that: adopt a temperature coefficient to reach the fixed value resistance R of 5ppm
0with tested thermal resistance R
xseries connection, engine electronic control system device is measured respectively fixed value resistance R
0magnitude of voltage U
0with thermal resistance R
xmagnitude of voltage U
x, according to Ohm law:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410263919.XA CN104006903A (en) | 2014-06-13 | 2014-06-13 | Method for detecting temperature sensor on engine inlet port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410263919.XA CN104006903A (en) | 2014-06-13 | 2014-06-13 | Method for detecting temperature sensor on engine inlet port |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104006903A true CN104006903A (en) | 2014-08-27 |
Family
ID=51367666
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410263919.XA Pending CN104006903A (en) | 2014-06-13 | 2014-06-13 | Method for detecting temperature sensor on engine inlet port |
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| Country | Link |
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| CN (1) | CN104006903A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108195479A (en) * | 2017-12-14 | 2018-06-22 | 中国航空工业集团公司上海航空测控技术研究所 | A kind of airplane engine temperature measuring device |
| CN110132443A (en) * | 2019-06-03 | 2019-08-16 | 广西玉柴机器股份有限公司 | The Acquisition Circuit of engine controller temperature sensor |
| CN113740068A (en) * | 2021-08-31 | 2021-12-03 | 重庆长安汽车股份有限公司 | Method for identifying influence of engine intake along-way temperature on vehicle acceleration performance |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809443A (en) * | 2011-11-28 | 2012-12-05 | 凯迈（洛阳）环测有限公司 | Method and circuit for measuring temperature |
-
2014
- 2014-06-13 CN CN201410263919.XA patent/CN104006903A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809443A (en) * | 2011-11-28 | 2012-12-05 | 凯迈（洛阳）环测有限公司 | Method and circuit for measuring temperature |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108195479A (en) * | 2017-12-14 | 2018-06-22 | 中国航空工业集团公司上海航空测控技术研究所 | A kind of airplane engine temperature measuring device |
| CN108195479B (en) * | 2017-12-14 | 2024-05-28 | 中国航空工业集团公司上海航空测控技术研究所 | Temperature measuring device for aircraft engine |
| CN110132443A (en) * | 2019-06-03 | 2019-08-16 | 广西玉柴机器股份有限公司 | The Acquisition Circuit of engine controller temperature sensor |
| CN113740068A (en) * | 2021-08-31 | 2021-12-03 | 重庆长安汽车股份有限公司 | Method for identifying influence of engine intake along-way temperature on vehicle acceleration performance |
| CN113740068B (en) * | 2021-08-31 | 2024-02-09 | 重庆长安汽车股份有限公司 | Method for identifying influence of engine air inlet along-path temperature on vehicle acceleration performance |
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Application publication date: 20140827 |
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| WD01 | Invention patent application deemed withdrawn after publication |