Wurst, R., "Engine Torque Measurement Using Telemetry," SAE Technical Paper 2004-01-2679, 2004, doi:10.4271/2004-01-2679.
This paper describes equipment developed to measure engine output torque. Several vehicle flexplates were modified and strain gauges were applied to measure torque. Special attention was paid to minimize or eliminate any changes in flexplate torsional stiffness. Torque signals are transmitted from the rotating flexplate to a stationary receiver via RF telemetry. The electronics on the rotating flexplate are powered using an induction power technique. This method was developed as a less invasive and less costly alternative to strain gauging a crankshaft.