A noncontact torque sensor has been developed for use in engine control systems. The sensor detects torque-induced changes in magnetic properties of the engine crankshaft.A miniature version of the sensor, mounted on a 1980 Chevrolet V-6 engine, is described. Sensor installation requires 22 mm of crankshaft space and a 1.0 mm air gap between sensor and crankshaft is utilized. For a variation of engine torque from −100 to 240 N·m, the sensor generates a linear signal which varies from −25 to 60 mV; amplification is used to provide an output signal of −500 to 1200 mV. A signal processor associated with the sensor is calibrated to give a torque sensitivity of 5 mV/N·m and it also includes an active filter with a low-pass cutoff frequency of 5 Hz.In its present state of development, torque measurement accuracy of the sensor is limited to approximately ±10 percent due to interfering effects of temperature, air gap variation, and engine speed sensitivity. Further investigation will be necessary to establish the ultimate performance potential of the sensor.
Noncontact Miniature Torque Sensor for Automotive Application
Sae Technical Papers
SAE International Congress and Exposition ; 1982
1982-02-01
Conference paper
English
Noncontact miniature torque sensor for automotive application
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