Title :
A multi-frequency wireless passive pressure sensor for TPMS applications
Author :
Wang, Xiaomu ; Zhou, Changjian ; Zhang, Zhaohua ; Ren, Tianling ; Liu, Litian
Author_Institution :
Tsinghua Nat. Lab. for Inf. Sci. & Technol., Tsinghua Univ., Beijing, China
Abstract :
A multi-frequency wireless passive pressure sensor was developed for tire pressure monitoring system. The applied sensor was fabricated with SAW delay lines on a membrane, which produced enhanced sensitivity and accuracy by means of multiple frequency Continues Wave. The SAW elements operate at two frequencies in 434 MHz band. The pressure is determined by calculating the reflective phase difference between the two frequencies. This new method avoids phase ambiguity and temperature dependence due to large membrane bending and temperature variation, and therefore enhances the sensor sensitivity and accuracy. In this paper, the implementation of the tire pressure monitoring system (TPMS) comprising remote sensor fabrication, interrogator structure and signal processing algorithm were described. Issues about sensor calibration were also discussed. This sensor attained superior high pressure sensitivity and lower system complexity compared to conventional SAW sensors, and is very suitable for TPMS.
Keywords :
UHF integrated circuits; bending; calibration; pressure sensors; sensor fusion; surface acoustic wave delay lines; surface acoustic wave sensors; tyres; wireless sensor networks; SAW delay lines; TPMS; high pressure sensitivity; interrogator structure; lower system complexity; membrane bending; multifrequency wireless passive pressure sensor; multiple frequency continuous wave; reflective phase difference; remote sensor fabrication; sensor calibration; sensor sensitivity; signal processing algorithm; temperature variation; tire pressure monitoring system; Biomembranes; Delay lines; Frequency; Remote monitoring; Sensor systems; Surface acoustic waves; Temperature dependence; Temperature sensors; Tires; Wireless sensor networks;
Conference_Titel :
Microelectronics & Electronics, 2009. PrimeAsia 2009. Asia Pacific Conference on Postgraduate Research in
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-4668-1
Electronic_ISBN :
978-1-4244-4669-8
DOI :
10.1109/PRIMEASIA.2009.5397439
