Engine exhaust temperature thermocouple detection circuit

A technology of exhaust temperature and detection circuit, which is applied to the temperature measurement of moving fluid, thermometer test/calibration, thermometer, etc., which can solve the problems that cannot reasonably solve the problems of thermocouple personality differences, poor versatility of engine electronic controller, etc., and achieve the measured value Stable and reliable, high test reliability, small ripple interference effect

Inactive Publication Date: 2014-08-27
SICHUAN YAMEI POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used thermocouple detection technology cannot reasonably solve the individual differences of thermocouples, resulting in poor versatility of engine electronic controllers

Method used

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  • Engine exhaust temperature thermocouple detection circuit
  • Engine exhaust temperature thermocouple detection circuit
  • Engine exhaust temperature thermocouple detection circuit

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Embodiment Construction

[0013] refer to figure 1 . Engine exhaust temperature thermocouple detection circuit, including: thermocouple cold junction acquisition unit, thermocouple feed unit, thermocouple loop detection unit and thermocouple differential input instrument amplification unit. The thermocouple differential input instrument amplification unit and the thermocouple loop detection unit are electrically connected to the AD conversion unit through the positive terminal and negative terminal voltage of the thermocouple sensor to form a thermocouple loop detection circuit, and the output voltage of the thermocouple cold junction acquisition unit is passed through the cold junction temperature. The operational amplifier of the output unit is processed and sent to the AD conversion unit for AD conversion, and the temperature of the cold junction is obtained through calculation by the CPU; the thermocouple feed unit divides the 5V reference voltage into two 2.5V voltages through the external T45 tem...

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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 [0001] The invention relates to collecting engine exhaust temperature through thermocouples, and a temperature acquisition circuit for detecting the engine exhaust temperature, especially a detection circuit for thermocouples at the exhaust port of aeroengines. Background technique [0002] Aeroengine exhaust temperature is an important parameter to determine the characteristics of the turbine and engine performance, and the detection of gas temperature after the turbine is an important part of engine performance detection, which directly affects the safety and life of the engine. When the jet temperature of the aircraft engine exceeds the limit temperature, the engine must be controlled by limiting fuel or stopping the engine so that the exhaust temperature of the engine does not exceed the specified value to ensure flight safety. This requires that the jet temperature of the aircraft engine can be measured timely and accurately during the flight process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K13/02G01K15/00G01K13/024
Inventor 王坚许会元郑志高
Owner SICHUAN YAMEI POWER TECH
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