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

Volume

3

fYear

2004

fDate

23-27 Aug. 2004

Firstpage

1577

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2004 IEEE

ISSN

1051-0117

Print_ISBN

0-7803-8412-1

Type

conf

DOI

10.1109/ULTSYM.2004.1418121

Filename

1418121