Title :
Application of Passive SAW Resonant Sensors to Contactless Measurement of the Output Engine Torque in Passenger Cars
Author :
Kalinin, V. ; Lohr, R. ; Leigh, A. ; Bown, G.
Author_Institution :
Transense Technol. plc, Bicester
fDate :
May 29 2007-June 1 2007
Abstract :
An engine output torque measurement system employing 433 MHz SAW resonators as sensing elements is presented. Either one or two SAW sensing elements incorporating three or five one-port resonators are attached to a flexplate that couples the crankshaft to the torque converter of a car with automatic transmission. An optimum design of the flexplate is described that minimizes the influence of extraneous mechanical forces. Design of the large diameter RF rotary coupler, as well as torque and temperature calibration characteristics of the sensor, is presented. An interrogation algorithm and its influence on system bandwidth are discussed. Experimental results of dynamic tests characterizing accuracy of the torque measurement are presented.
Keywords :
automobiles; calibration; engines; shafts; surface acoustic wave resonators; surface acoustic wave sensors; torque measurement; RF rotary coupler; crankshaft; engine output torque measurement system; flexplate; frequency 433 MHz; one-port resonator; passenger cars; passive SAW resonant sensor; surface acoustic wave resonator; temperature calibration characteristics; torque converter; Calibration; Couplings; Engines; Mechanical sensors; Radio frequency; Resonance; Surface acoustic waves; Temperature sensors; Torque converters; Torque measurement;
Conference_Titel :
Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International
Conference_Location :
Geneva
Print_ISBN :
978-1-4244-0646-3
Electronic_ISBN :
1075-6787
DOI :
10.1109/FREQ.2007.4319124
