Internal Combustion Engine Piston Temperature Self-Powered Wireless Telemetry Device

Abstract

The invention discloses a self-powered wireless telemetering device for piston temperature of an internal combustion engine. The device includes a power supply unit, a temperature signal acquisition unit, a wireless transmitting unit and a wireless receiving unit. The power supply unit is mainly composed of an iron core coil fixed on the piston and a permanent magnet fixed on the connecting rod. The two reciprocate to generate an induced voltage, and after the voltage is stabilized, they continuously supply power to the subsequent measurement circuit. The temperature signal acquisition unit transmits the collected multi-channel temperature signal inside the piston to the wireless transmitting unit fixed in the inner cavity of the piston, and the wireless transmitting unit transmits the wireless transmitting unit to the wireless receiving unit fixed at the bottom of the crankcase through radio waves. The device is equipped with a power generation unit, and the power consumption of the whole device is low, which ensures the sustainability of the measurement and can solve the unreliable problem of the power supply battery in the high-speed reciprocating motion of the piston.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine testing, in particular to a self-powered wireless measuring device for piston temperature. Background technique [0002] As the "heart" of the internal combustion engine, the piston is one of the most important components that convert the internal energy of high-temperature gas into internal combustion engine energy. Its working environment is the worst among internal combustion engine components. heat load. With the development of the engine towards high speed and strengthening, the boost ratio and specific power of the engine continue to increase, and the severe heat load becomes more and more prominent. In order to evaluate the thermal load of the piston, an intuitive and effective method is to analyze the temperature field of the piston. At present, the temperature field analysis of the piston mostly adopts finite element numerical simulation to obtain an approximate tempe...

AI Technical Summary

Problems solved by technology

The electromagnetic induction method and the infrared telemetry method rely on point-to-point transmission of signals, and can only obtain the temperature at the bottom dead center of the piston, which is not conducive to multi-channel reliability measurement

Storage method, which can continuously sample temperature data at any time under any working condition, but it is necessary to take out the memory from the piston when reading the data

In addition, the existing electric measurement methods all require battery or power supply, and the general battery life is about 4 hours, while the standard engine test takes even more than 100 hours, and the battery is installed in the inner cavity of the piston, which is difficult to replace

Moreover, at a high temperature of about 150 degrees, even if the battery performance is not damaged, it will be greatly weakened, and it is very dangerous to use the battery at high temperature

If an external power supply is used, the power leads will reciprocate rapidly with the piston, and the fatigue life will be extremely low

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