Smart Sensing in Steering and Chassis Applications: a Digital Torque and Absolute Angle Sensor 2000-01-C057
This paper describes the operation of an advanced CMOS opto-ASIC used in a digital torque and angle sensor. Its purpose is to resolve the relative and absolute angular position of two bar-coded disks rotationally coupled by a stiff torsion bar. The resulting digital output of the sensor comprises two absolute angle measurements with up to 18-bit accuracy, and a torque measurement calculated from the difference of the two angular measurements. The measurement of torque and absolute angle in a single sensor eliminates the need for additional steering angle sensors for other vehicle dynamic systems such as dynamic stability control (DSC) or intelligent cruise control (ICC).
David Bernardi, John Baxter, Alex Mortara
Bishop Innovation Limited, Centre Suisse d'Electronique et de Microtechnique SA
Convergence 2000 International Congress on Transportation Electronics