A UAV Engine Cylinder Temperature Measurer with Linear High Precision

Abstract

The invention relates to a cylinder temperature measuring device for an unmanned aerial vehicle with linear and high precision. After the voltage output by the first power supply is processed by the power isolation circuit, the output voltage is stepped down by the second power drive circuit, and the input signal Acquisition circuit; the other channel is passed into the signal conditioning circuit to provide positive voltage for the signal conditioning circuit; the voltage output by the second power supply is stepped down by the first power supply drive circuit, and then transmitted to the signal conditioning circuit to supply negative voltage for the signal conditioning circuit Voltage; the resistance value of the temperature measuring resistor is transmitted to the signal conditioning circuit, and after the signal conditioning circuit performs nonlinear, zero, and gain processing, it is transmitted to the signal acquisition circuit for AD acquisition of temperature. The invention utilizes the non-linear relationship between the resistance value of the thermistor and the temperature, and realizes the zero position of the signal, the adjustment of the amplification factor and the non-linearity through signal conditioning, so that the temperature and the measurement signal have a linear relationship, and at the same time adopts the ARM as the core The signal acquisition circuit improves the real-time performance of signal acquisition.

Description

technical field [0001] The invention belongs to the technical field of engine cylinder temperature measurement, and relates to a linear and high-precision unmanned aerial vehicle engine cylinder temperature measurer for the engine cylinder temperature of a small unmanned aerial vehicle, especially with the function of prompting the engine cylinder temperature to be within a safe range . Background technique [0002] At present, the known temperature measurement methods mainly include: temperature measurement by a thermistor, temperature measurement by a diode, temperature measurement by a triode, temperature measurement by a temperature measurement bridge circuit, and the like. Thermistor temperature measurement uses the relationship between temperature and resistance value to look up the table; diode temperature measurement uses the reverse leakage current of the diode to have a certain relationship with temperature to measure temperature, but the relationship between curre...

AI Technical Summary

Problems solved by technology

The known temperature measuring devices all adjust the zero position and gain through the resistance, so that the output signal and the temperature measuring resistance value are in a linear relationship for temperature measurement, but because the temperature measuring resistance value and the temperature have a nonlinear relationship, the output signal and the temperature also It is a nonlinear relationship. After the nonlinear relationship, the output signal and temperature have a nonlinear relationship, so that the temperature value cannot be read directly through the output signal. The resistance value of the temperature measuring resistor can only be read through the output signal, and then the temperature can be read through the temperature and temperature measurement. The nonlinear correspondence table of the resistance value can be used to look up the table to get the approximate temperature value, and the accuracy is not high

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