Title :
Pulsed interrogation of the SAW torque sensor for electrical power assisted steering
Author :
Kalinin, Victor ; Bown, George ; Beckley, John ; Lohr, Raymond
Author_Institution :
Transense Technol. plc., Bicester, UK
Abstract :
A contactless torque sensor, based on four one-port SAW resonators on quartz substrates working in the 430-437 MHz frequency range, is presented in this paper. The design of the sensor allows full compensation of the bending effect. A single stationary interrogation unit is used to measure resonant frequencies of all four resonators attached to the rotating shaft. The interrogation method is based on a pulsed excitation of the natural oscillations and their subsequent spectral analysis. The achieved standard deviation of the measured frequency difference is sufficient for electrical power assisted-steering applications in the automotive industry.
Keywords :
automotive electronics; compensation; surface acoustic wave resonators; surface acoustic wave sensors; torque measurement; 430 to 437 MHz; SAW torque sensor; automotive EPAS; bending effect compensation; contactless torque sensor; electrical power assisted steering; mechanical overload protection; natural oscillation pulsed excitation interrogation method; quad one-port SAW resonators; resonant frequency measurement; rotating shaft attached resonators; spectral analysis; stationary pulsed interrogation unit; Contacts; Frequency measurement; Measurement standards; Power steering; Resonant frequency; Rotation measurement; Shafts; Spectral analysis; Surface acoustic waves; Torque;
Conference_Titel :
Ultrasonics Symposium, 2004 IEEE
Print_ISBN :
0-7803-8412-1
DOI :
10.1109/ULTSYM.2004.1418121
