Wireless Temperature Measurement Method for Rotating Friction Elements in Transmission Systems

With the development of special vehicles toward high rotational speeds and high power density, the problems of thermal load and local high temperature of transmission friction components have become increasingly prominent, severely affecting the reliability and service life of the transmission system. Monitoring the real-time temperature of rotating friction components is key to preventing sudden failures. However, traditional wired temperature measurement methods are constrained by limited space, wiring limitations, and signal interference, making reliable monitoring of dynamically rotating components difficult to achieve. To address this, with rotating friction components of wet-type shift clutches as research subjects, a numerical model of the temperature field for multiple friction pairs was established. The characteristics of the friction pair temperature field were obtained, determining the temperature measurement point locations for subsequent experiments. By integrating electromagnetic induction power supply and near-field communication technology, a passive wireless real-time temperature testing method and system were developed, validated through bench testing. The bench tests demonstrated that the system operated stably under various rotational speeds, pressures, and measurement point conditions. The correlation coefficient between the simulated temperature field of friction components and the measured temperature field (both wireless and wired) exceeded 0.95, showing highly consistent trends in temperature changes. The average error percentage did not exceed 8.5%, indicating that this wireless temperature measurement method possesses excellent dynamic response capability and operational adaptability.