Abstract: In this study, we investigated the cause of the contact failure phenomenon of the oil temperature sensor whose signal error occurred intermittently during vehicle driving. The electrical contact failed sensor was disassembled and observed the contact surfaces with a scanning electron microscope (SEM). In the case of the present oil temperature sensor, the difference in thermal expansion coefficient of the male-female terminal and the vibration during driving cause fretting corrosion at the contact area. Fretting corrosion causes the signal error intermittently. It is judged that the lead wire composed of the flexible thin plate is structurally vulnerable to vibrations during driving, which further causes fretting of the contact point. Therefore, it is necessary to design an additional structural supplement to fix the flexible terminal of the sensor system.
Keywords: Oil Temperature Sensor, Automotive Transmission, scanning electron microscope (SEM).
Title: A Case Study of Contact Failure of Oil Temperature Sensor for Automotive Transmission
Author: Yong-Ki Joo, Ho-Kyung Kim
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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