Abstract
It is difficult to measure the temperature of solenoid valve windings in an automatic transmission with high precision. Distributed optical fibre sensing technology was used to measure the temperature of solenoid valve windings in this study. The finite element method was also used to establish an electromagnetic thermal-mechanical coupling model describing the temperature of the solenoid valve. Bidirectional coupling between the electromagnetic field and temperature, and dynamic changes in material properties with temperature, are considered in the model presented here. The simulation presented here is a closer representation of an actual solenoid valve. The temperature distribution was calculated for each component during operation. The simulated winding temperature and that measured with the inverse resistance method in ideal conditions are compared with the fibre optic temperature measurements. The results illustrate the feasibility and accuracy of the method for measuring the temperature of small windings. Finally, the reproducibility of the temperature measurement method was evaluated.
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