This paper describes a contactless differential torque sensor for use in a steering column of a vehicle having an all-electric power steering assist system. The basic concept of an eddy current surface-effect phase shift sensor is described along with its equivalent electrical circuit. A configuration giving low drift and good linearity is proposed. One low-cost method of exciting the sensor and demodulating the signal is shown. Characteristics, a block diagram of an overall electric assist steering system using the sensor and potential advantages of electric power steering are provided.
A Contactless Surface-Effect Sensor for All-Electric Power Steering
Sae Technical Papers
SAE International Congress and Exposition ; 1984
1984-02-01
Conference paper
English
A Contactless Surface-Effect Sensor for All-Electric Power Steering
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