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Development of a Magnetoelastic Torque Transducer for Automotive Transmission Applications

From Magna-Lastic Devices, Inc. (MDI), A Methode Electronics, Inc. Company
 

 

The development of a transducer for sensing the torque on the output shaft of a four speed rear wheel drive automatic transmission is described. Magnoelastic polarized ring technology was selected based on its independence from shaft properties and its non-contact mode of sensing. The ring and several intermediate sleeves were attached by press fits onto an experimental shaft. The magnetic field arising from the ring with the application of torque was sensed by flux gate sensing elements. Ability to accurately measure the output torque of an engine driven transmission over its full range of torque and speed was demonstrated by dynamometer tests.

Automotive transmissions serve to match the available torque and speed of the vehicle's enginer ( or other on-board prime mover) with the tractive effort required at the wheels to attain or maintain the speed and direction of travel desired by the driver.

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