CN104006902A - Engine exhaust temperature thermocouple detection circuit - Google Patents
Engine exhaust temperature thermocouple detection circuit Download PDFInfo
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- CN104006902A CN104006902A CN201410263697.1A CN201410263697A CN104006902A CN 104006902 A CN104006902 A CN 104006902A CN 201410263697 A CN201410263697 A CN 201410263697A CN 104006902 A CN104006902 A CN 104006902A
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Abstract
The invention provides an engine exhaust temperature thermocouple detection circuit, and relates to an engine exhaust temperature detection circuit which is high in test reliability and small in feed circuit ripple. The engine exhaust temperature thermocouple detection circuit is implemented through the following technical scheme, a thermocouple differential input instrument amplification unit and a thermocouple loop detection unit are electrically connected with an AD conversion unit through the positive end and the negative end of a thermocouple sensor to form a thermocouple loop detection circuit, and the output voltage of a thermocouple cold-end collection unit is fed into the AD conversion unit through a cold-end temperature processing unit and calculated through a CPU so that the cold-end temperature can be obtained. A thermocouple feed unit divides the reference voltage into two paths through an external T45 temperature sensor, and the thermocouple sensor negative-end voltage is fed to the AD conversion unit by one path of the reference voltage through the thermocouple loop detection unit; the other path of the reference voltage is input into the thermocouple differential input instrument amplification unit through feeding of the thermocouple sensor, and after a voltage difference signal is differentially amplified, the differentially amplified voltage difference signal is collected by an AD converter, and is fed into the CPU so that a thermocouple fault can be judged.
Description
Technical field
The invention relates to by thermopair and gather engine exhaust temperature, detect temperature collection circuit, the especially testing circuit of aeromotor exhausr port thermopair of engine exhaust temperature.
Background technology
Exhaust temperature of aircraft engine is the important parameter of determining turbine characteristic and engine performance, and after turbine, fuel gas temperature detection is the important content that engine performance detects, and directly affects safety and the life-span of engine.When the jet temperature of aircraft engine surpasses limiting temperature, must take limit oil or stop to control to engine, make engine exhaust temperature be no more than setting, guarantee flight safety.This just requires in aircraft flight process, can measure timely and accurately the jet temperature of aircraft engine.Thermopair (thermocouple) is temperature element conventional in temperature measuring instrument, and it directly measures temperature, and temperature signal is converted to thermopower signal, converts the temperature of measured medium by electric meter (secondary instrument) to.The ultimate principle of thermocouple temperature measurement is that the material conductor of two kinds of different components forms closed-loop path, when two ends exist thermograde, noble potential will occur to electronegative potential electric discharge phenomena in loop, just has electric current and produce in loop, produces thermopower.By the principal element of the error effect of the jet temperature of thermocouple measurement aircraft engine, have: cold junction temperature error, heat radiation, insertion depth and the dynamic error of thermopair.The thermoelectrical potential of thermopair output departs from 0 ℃ with cold junction temperature and produces measuring error, forms thermocouple cold junction error.Therefore after engine turbine, fuel gas temperature is generally that the thermopair consisting of chromel-alumel element is measured.Detect electric thermo-couple temperature and must detect its cold junction temperature, just can calculate hot-side temperature, Here it is said thermocouple cold junction compensation.The method of eliminating thermocouple cold junction error is more, and conventional have 0 ℃ of constant temperature method of cold junction, thermoelectrical potential revised law, temperature revised law, thermopair penalty method, electric bridge penalty method and a compensating wire method etc.At present, pneumatic total warm type thermopair of application, during due to measurement gas temperature, thermocouple assembly in the pipeline of engine jet pipe, the complicacy of its structure, generally directly verification.Conventionally the method adopting is: directly connect with the secondary instrument that meets thermocouple indexing table; On engine with master body to recently realizing.While measuring temperature, temperature-sensing element and measured medium will pass through heat interchange and just can reach identical temperature.Because temperature-sensing element has certain thermal inertia, when medium temperature changes, heat transfer process can not complete rapidly, thereby just has delay error in kinetic measurement process.
Although thermopair is widely used in the various fields of temperature survey, in airborne test, electric thermo-couple temperature measurement has its more complicated singularity.As exist thermocouple signal to be faintly easily disturbed, the problems such as temperature voltage is nonlinear relationship, need to compensate with reference to abutment, thermopair ground connection.The collection of correct temperature signal directly determines the judgement of control system to present engine state, directly affects the control to engine, thereby affects the control of engine condition.The Measurement accuracy of fuel gas temperature has a direct impact control engine state, even causes mistake protection, causes the gross errors such as engine cut-off.The temperature parameter of the checking to aircraft engine performance parameter, particularly engine and pressure parameter, require very highly, only has accurate measurement, just can know the truth of parameter.Because temperature measuring point is too many, and the form of the thermopair that engine itself is loaded onto is also different, therefore, the faint voltage signal of thermopair must be nursed one's health, become the signal that the collected equipment of energy gathers, and this conditioning process is a very complicated technical barrier.The temperature survey front end circuit of thermocouple signal treatment circuit design, conventional thermopair input impedance is little, and output voltage is low, still has certain individual difference between same model thermopair, brings difficulty so just to the accurate detection of thermopair.Exhaust temperature of aircraft engine thermopair detected temperatures scope, at-55 ℃～1100 ℃, has the features such as range of temperature is large, rate temperature change is fast.Engine electronic control system device must promptly and accurately gather the temperature of thermopair, according to the temperature gathering, calculates engine T4 temperature and takes suitable algorithm control engine fuel flow, limiting engine internal work temperature.Yet conventional thermopair detection technique can not rationally solve the individual difference of thermopair, cause engine electronic control system device versatility poor.
Summary of the invention
The object of the invention is the problem existing for above-mentioned prior art, provide that a kind of testing reliability is high, feed circuit ripple is little, antijamming capability is strong, measured value is reliable and stable, obtains the engine exhaust temperature testing circuit that precision is high.
Above-mentioned purpose of the present invention can reach by following measures, a kind of engine exhaust temperature thermopair testing circuit, comprise: thermocouple cold junction collecting unit, thermopair feed element, thermopair loop detection unit and thermopair difference input instrument amplifying unit, is characterized in that: thermopair difference input instrument amplifying unit and thermopair loop detection unit are electrically connected to AD converting unit by thermocouple sensor anode and negative terminal respectively and form thermopair loop detection circuit; Thermocouple cold junction collecting unit output voltage is sent into after AD converting unit AD conversion by cold junction temperature processing unit, through CPU, calculates and obtains cold junction temperature; Thermopair feed element is two-way by 5V reference voltage through outside T45 temperature sensor dividing potential drop, leading up to thermopair loop detection unit delivers to AD converting unit by thermocouple sensor negative terminal voltage, another road is fed to the faint current signal input thermopair difference input instrument amplifying unit of millivolt level via engine electronic control system device thermoelectric couple sensor, AD converter collection will be supplied after voltage differential signal differential amplification, and sending into CPU, CPU detects magnitude of voltage judgement thermopair fault according to thermocouple sensor.
The present invention has following beneficial effect than prior art.
Testing reliability is high, feed circuit ripple is little.5V reference voltage of the present invention amplifies and processes through thermopair feed element operational amplifier U3A, through actual measurement, checks that feed circuit ripple is very little.Because thermopair is exported positive and negative end connected respectively resistance R 13 and R15, engine exhaust temperature thermocouple sensor is short-circuited or circuit breakage can not cause feed circuit to damage, and feed circuit security, reliability are very high.
Antijamming capability is strong, measured value is reliable and stable.The present invention adopts enlargement factor can reach the thermopair difference input instrument amplifying unit of 100 times, and the ripple interference after treatment of output difference component voltage is very little, is not subject to external interference, and actual measured value is reliable and stable.
Engine electronic control system device can be observed electronic controller temperature of living in by T0 cold junction testing circuit, and by this temperature, the T45 gross value collecting is compensated and calculates T45 electric thermo-couple temperature value comparatively accurately.Engine electronic control system device is fed to faint current signal to T45 thermocouple sensor, because thermopair impedance is little, the voltage difference that this electric current produces due to temperature thermopair input end affects very little, but the magnitude of voltage size that can detect by loop voltage of the present invention judges whether thermopair opens circuit.
Accompanying drawing explanation
Fig. 1 is engine exhaust temperature thermopair testing circuit block diagram of the present invention.
Fig. 2 is thermocouple cold junction collecting unit circuit theory schematic diagram in Fig. 1.
Fig. 3 is thermopair loop detection circuit theory schematic diagram of the present invention.
Embodiment
Consult Fig. 1.Engine exhaust temperature thermopair testing circuit, comprising: thermocouple cold junction collecting unit, thermopair feed element, thermopair loop detection unit and thermopair difference input instrument amplifying unit.Thermopair difference input instrument amplifying unit and thermopair loop detection unit are electrically connected to AD converting unit by thermocouple sensor anode and negative terminal voltage respectively and form thermopair loop detection circuit, thermocouple cold junction collecting unit output voltage by cold junction temperature out the operational amplifier of unit process and to send into after AD converting unit AD conversion, through CPU, calculates acquisition cold junction temperature, thermopair feed element is two-way 2.5V voltage by 5V reference voltage through outside T45 temperature sensor dividing potential drop, lead up to thermopair loop detection unit by thermocouple sensor negative terminal voltage, after processing, amplifier delivers to AD converting unit, another road is via engine electronic control system device, thermoelectric couple sensor is fed to the faint current signal input thermopair difference input instrument amplifying unit of millivolt level, AD converter collection will be supplied after voltage differential signal differential amplification, and send into CPU, CPU detects magnitude of voltage according to thermocouple sensor, loop detection unit inspection loop voltage value judges whether conducting of thermopair, open circuit.
Consult Fig. 2.In the thermocouple cold junction Acquisition Circuit of thermocouple cold junction collecting unit, temperature sensor is generally placed near engine electronic control system device input and output connector.The cold junction temperature sensor of cold junction temperature Acquisition Circuit generally consists of three end linear temperature sensors.Cold junction temperature Acquisition Circuit U1 adopts be temperature working range generally at the AD590 temperature acquisition chip of-55 ℃～125 ℃, its operating voltage is in 9V left and right.AD590 is output current intensity 298.2 μ A when 25 ℃ of normal temperature, 1 ℃ of the every rising of temperature, and output current intensity increases 1 μ A, and the resistance of Rational choice resistance R 3 just can obtain the voltage being directly proportional with collection point temperature thus.
Thermocouple cold junction collecting unit comprises that the resistance R 1, current-limiting resistance R2 and the cross-over connection that are connected on temperature acquisition chip U1 input, output terminal are connected in parallel on filter capacitor C1, the filter capacitor C2 at temperature acquisition chip U1 two ends, and be connected on resistance R 2 and penetrate with between amplifier U2A, the parallel filtering circuit that resistance R 4 R3 in parallel and direct earth capacitance C3 form.+ 9V voltage process current-limiting resistance R1 is to U1 anode, and pass through temperature acquisition chip U1 earth terminal and filter capacitor C2 filtering through filter capacitor C1, ground connection after electrical connection current-limiting resistance R2 and R3, the voltage in resistance R 3 is penetrated with amplification to U2A through the filtering circuit of resistance R 4 and capacitor C 3 formations.The thermocouple cold junction collection voltage signal of penetrating with amplifier U2A output outputs to AD converting unit, and through AD conversion rear engine electronic controller, CPU just can obtain cold junction temperature.Due to cold junction temperature collection be near temperature engine electronic control system device connector, so can obtain engine electronic control system device environment temperature of living in by this cold junction temperature value simultaneously.
Consult Fig. 3.Engine exhaust temperature thermocouple sensor output difference component voltage is all generally a millivolt rank voltage, so it is must ripple very little that thermopair is carried out to feed.Thermopair feed element comprises being connected on respectively penetrates resistance R 12 and the resistance R 13 being electrically connected to amplifier U3A positive input and output terminal.The general resistance of engine exhaust temperature thermocouple sensor is all less than 10 Ω, and U3A output 5V voltage sensor both end voltage after resistance R 13 and R15 ground connection is generally 2.5V left and right.Thermopair feed principle is: the 5V reference voltage that engine electronic control system device inside provides is delivered to U3A through current-limiting resistance R12, through U3A, penetrate with amplifying output 5V voltage, this 5V voltage through current-limiting resistance R13 to outer delivery temperature thermocouple sensor anode, electric current after thermopair by resistance R 15 ground connection.Because 5V reference voltage amplifies and processes through U3A, through actual measurement, check that feed circuit ripple is very little.Because thermopair is exported positive and negative end connected respectively resistance R 13 and R15, engine exhaust temperature thermocouple sensor is short-circuited or circuit breakage can not cause feed circuit to damage, and this feed circuit security thus, reliability are very high.
Thermopair loop detection unit comprises being formed impedance matching filtering circuit and be connected on the resistance R 16 on operational amplifier U4A positive input by resistance R 14 parallel resistance R15 and capacitor C 6 of thermopair negative terminal series connection.Voltage on thermopair negative terminal R15 after resistance R 14 and capacitor C 6 filtering to resistance R 16, after resistance R 16 current limlitings to penetrating with amplifier U4A.When thermopair opens circuit, U4A output voltage is 0V; When thermopair resistance is during much larger than 10 Ω, U4A output voltage will be less than 2.5V.U4A output voltage is through AD conversion, and engine electronic control system device just can judge whether thermocouple sensor opens circuit or impedance mismatch according to magnitude of voltage after conversion.
Engine exhaust temperature thermocouple sensor output difference component voltage is all generally a millivolt rank voltage.Its thermopair input end is because temperature produces voltage difference scope for-1.9～45.1mV, for the temperature value that the high precision of obtaining, low temperature waft, can be convenient to AD converter collection just this differential voltage signal must pass through the differential amplification that instrument amplifier that high input impedance, high-amplification-factor, high precision, low temperature waft carries out 100 times of left and right.Thermopair difference input instrument amplifying unit comprises: be connected on the thermopair output negative terminal direct earth capacitance C7 in parallel with resistance in series R18 between operational amplifier U5 positive input, operational amplifier U5 reverse input end is connected electrically in thermopair output terminal and consists of between impedance matching filtering circuit and R16 resistance R 14 parallel resistance R15 and capacitor C 6.Thermopair negative terminal input is through resistance R 14 and capacitor C 6 impedance matchings and filtering to U5 input negative terminal, and thermopair anode is to U5 input anode after resistance R 18 and capacitor C 7 impedance matchings and filtering, and it is 100 times that resistance R 17 regulates the enlargement factor of U5.Instrument amplifier U5 output voltage is delivered to AD converting unit, through conversion rear engine electronic controller CPU, just can table look-up and obtain Thermocouple Temperature Acquisition value.Thermopair difference input instrument amplifying unit output difference component voltage ripple after processing of circuit of the present invention disturbs very little, is not subject to external interference, and actual measured value is reliable and stable.U5 in circuit of the present invention can adopt the instrument amplifier AD621 of U.S. ANALOG DEVICE company as core devices.
Claims (10)
1. an engine exhaust temperature thermopair testing circuit, comprise: thermocouple cold junction collecting unit, thermopair feed element, thermopair loop detection unit and thermopair difference input instrument amplifying unit, is characterized in that: thermopair difference input instrument amplifying unit and thermopair loop detection unit are electrically connected to AD converting unit by thermocouple sensor anode and negative terminal respectively and form thermopair loop detection circuit; Thermocouple cold junction collecting unit output voltage is sent into after AD converting unit AD conversion by cold junction temperature processing unit, through CPU, calculates and obtains cold junction temperature; Thermopair feed element is two-way by reference voltage through outside T45 temperature sensor dividing potential drop, leading up to thermopair loop detection unit delivers to AD converting unit by thermocouple sensor negative terminal voltage, another road is fed to the faint current signal input thermopair difference input instrument amplifying unit of millivolt level via engine electronic control system device thermoelectric couple sensor, AD converter collection will be supplied after voltage differential signal differential amplification, and sending into CPU, CPU detects magnitude of voltage judgement thermopair fault according to thermocouple sensor.
2. engine exhaust temperature thermopair testing circuit as claimed in claim 1, is characterized in that: in the thermocouple cold junction Acquisition Circuit of thermocouple cold junction collecting unit, temperature sensor is placed near engine electronic control system device input and output connector.
3. engine exhaust temperature thermopair testing circuit as claimed in claim 2, it is characterized in that: thermocouple cold junction collecting unit is cold junction temperature Acquisition Circuit U1, cold junction temperature Acquisition Circuit U1 adopts is temperature working range at the AD590 temperature acquisition chip of-55 ℃～125 ℃, and its operating voltage is 9V.
4. engine exhaust temperature thermopair testing circuit as claimed in claim 1, is characterized in that: thermopair feed element comprises being connected on respectively penetrates resistance R 12 and the resistance R 13 being electrically connected to amplifier U3A positive input and output terminal.
5. engine exhaust temperature thermopair testing circuit as claimed in claim 1, is characterized in that: thermopair is exported positive and negative end and is in series with respectively resistance R 13 and R15.
6. the engine exhaust temperature thermopair testing circuit as described in claim 4 or 5, it is characterized in that: reference voltage is delivered to and penetrated with amplifier U3A through current-limiting resistance R12, through U3A, penetrate with amplifying output 5V voltage, this 5V voltage through current-limiting resistance R13 to outer delivery temperature thermocouple sensor anode, electric current after thermopair by resistance R 15 ground connection.
7. engine exhaust temperature thermopair testing circuit as claimed in claim 5, is characterized in that: penetrate with amplifier U3A output 5V voltage after resistance R 13 and R15 ground connection, sensor both end voltage is 2.5.
8. engine exhaust temperature thermopair testing circuit as claimed in claim 1, is characterized in that: thermopair loop detection unit comprises being formed impedance matching filtering circuit and be connected on the resistance R 16 on operational amplifier U4A positive input by resistance R 14 parallel resistance R15 and capacitor C 6 of thermopair negative terminal series connection.
9. engine exhaust temperature thermopair testing circuit as claimed in claim 8, is characterized in that: the voltage on thermopair negative terminal R15 after resistance R 14 and capacitor C 6 filtering to resistance R 16, after resistance R 16 current limlitings to penetrating with amplifier U4A; When thermopair opens circuit, U4A output voltage is 0V; When thermopair resistance is during much larger than 10 Ω, U4A output voltage is less than 2.5V.
10. engine exhaust temperature thermopair testing circuit as claimed in claim 1, it is characterized in that: thermopair difference input instrument amplifying unit comprises: be connected on the thermopair output negative terminal direct earth capacitance C7 in parallel with resistance in series R18 between operational amplifier U5 positive input, operational amplifier U5 reverse input end is connected electrically in thermopair output terminal and consists of between impedance matching filtering circuit and R16 resistance R 14 parallel resistance R15 and capacitor C 6.
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| CN201410263697.1A CN104006902A (en) | 2014-06-13 | 2014-06-13 | Engine exhaust temperature thermocouple detection circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651409A (en) * | 2016-04-06 | 2016-06-08 | 中国南方航空工业(集团)有限公司 | Thermocouple cold junction compensation and temperature measurement circuit and device |
| CN107180461A (en) * | 2016-03-10 | 2017-09-19 | 通用电气公司 | The method and system of aircraft engine operating condition is predicted using aircraft data |
| CN107655582A (en) * | 2017-09-29 | 2018-02-02 | 中北大学 | A kind of temperature measuring circuit based on K-type thermocouple |
| CN108051101A (en) * | 2017-12-06 | 2018-05-18 | 华中科技大学 | A kind of engine temperature test system based on STM32 microcontrollers |
| CN109839020A (en) * | 2017-11-28 | 2019-06-04 | 李明守 | A kind of mechanical filter |
| CN110398296A (en) * | 2019-07-31 | 2019-11-01 | 中国人民解放军海军工程大学 | A ModbusTCP/IP-Based Engine Exhaust Temperature Inspection System |
| CN112525371A (en) * | 2020-11-20 | 2021-03-19 | 华中科技大学 | Exhaust temperature acquisition system for vehicle |
| CN113375824A (en) * | 2021-05-21 | 2021-09-10 | 成都凯天电子股份有限公司 | Atmospheric total temperature sensor with compensation unit and calculation and selection method thereof |
| CN116449105A (en) * | 2023-05-04 | 2023-07-18 | 宁波奥崎自动化仪表设备有限公司 | High-precision wide-range thermocouple resistance measuring circuit |
-
2014
- 2014-06-13 CN CN201410263697.1A patent/CN104006902A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107180461A (en) * | 2016-03-10 | 2017-09-19 | 通用电气公司 | The method and system of aircraft engine operating condition is predicted using aircraft data |
| CN105651409A (en) * | 2016-04-06 | 2016-06-08 | 中国南方航空工业(集团)有限公司 | Thermocouple cold junction compensation and temperature measurement circuit and device |
| CN105651409B (en) * | 2016-04-06 | 2018-11-16 | 中国南方航空工业(集团)有限公司 | Cold junction compensation temperature measurement circuit and device |
| CN107655582A (en) * | 2017-09-29 | 2018-02-02 | 中北大学 | A kind of temperature measuring circuit based on K-type thermocouple |
| CN107655582B (en) * | 2017-09-29 | 2019-08-06 | 中北大学 | A temperature measurement circuit based on K-type thermocouple |
| CN109839020B (en) * | 2017-11-28 | 2022-04-15 | 李明守 | Mechanical filter |
| CN109839020A (en) * | 2017-11-28 | 2019-06-04 | 李明守 | A kind of mechanical filter |
| CN108051101A (en) * | 2017-12-06 | 2018-05-18 | 华中科技大学 | A kind of engine temperature test system based on STM32 microcontrollers |
| CN110398296A (en) * | 2019-07-31 | 2019-11-01 | 中国人民解放军海军工程大学 | A ModbusTCP/IP-Based Engine Exhaust Temperature Inspection System |
| CN112525371A (en) * | 2020-11-20 | 2021-03-19 | 华中科技大学 | Exhaust temperature acquisition system for vehicle |
| CN113375824A (en) * | 2021-05-21 | 2021-09-10 | 成都凯天电子股份有限公司 | Atmospheric total temperature sensor with compensation unit and calculation and selection method thereof |
| CN113375824B (en) * | 2021-05-21 | 2023-06-16 | 成都凯天电子股份有限公司 | Atmospheric total temperature sensor with compensation unit and calculation and selection method thereof |
| CN116449105A (en) * | 2023-05-04 | 2023-07-18 | 宁波奥崎自动化仪表设备有限公司 | High-precision wide-range thermocouple resistance measuring circuit |
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Application publication date: 20140827 |