Title :
An opto-electronic 18 b/revolution absolute angle and torque sensor for automotive steering applications
Author :
Mortara, A. ; Heim, P. ; Masa, P. ; Franzi, E. ; Ruedi, P.-F. ; Heitger, F. ; Baxter, J.
Author_Institution :
Centre Suisse d´Electron. et de Microtech. SA, Neuchatel, Switzerland
Abstract :
This application-specific integrated circuit (ASIC) computes two optically encoded positions, each engraved in a pattern onto one of a two-cylinder assembly. The cylinders are coupled by a torsion bar of known stiffness so that the difference between the two extracted positions provides a torque measurement to be used in next-generation automobile electrical power assisted steering (EPAS) systems. The cylinder positions are defined by 11b absolute-position encoders plus 7 additional bits of interpolated (relative) position between adjacent codes. The circuit is controlled and accessed via a serial peripheral interface (SPI).
Keywords :
angular measurement; application specific integrated circuits; automotive electronics; microsensors; optical sensors; torque measurement; absolute position optical encoder; angle measurement; application specific integrated circuit; automobile electrical power assisted steering system; optoelectronic sensor; serial peripheral interface; torque measurement; Application specific integrated circuits; Automotive engineering; CMOS technology; Decoding; Image resolution; Integrated circuit measurements; Pixel; Semiconductor device measurement; Solid state circuits; Torque measurement;
Conference_Titel :
Solid-State Circuits Conference, 2000. Digest of Technical Papers. ISSCC. 2000 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-5853-8
DOI :
10.1109/ISSCC.2000.839740
