An apparatus 200b and method is disclosed for detecting sensor error, in a system measuring e.g. angle of rotation in, for example, a power steering system. Three channels comprising respective magnetic sensing elements 102a-c, for instance anisotropic magneto-resistance (AMR) sensors, oriented at different respective angles, are fed into a processor 210, which computes expected third channel data from the first and second channel data, detecting sensor error based at least partly on a comparison of expected with actual third channel data. The angle measurement may be computed using an arctan function and the channels may further comprise an amplifier A1-A3 and a sampling circuit S1-S3. Each sensing element of respective sensing channels may comprise a full bridge circuit. The orientation angle of the third sensing element relative to the first may be approximately half that of the second sensing element relative to the same.
Detecting sensor error
2016-11-16
Patent
Electronic Resource
English
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge / G01B MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS , Messen der Länge, der Dicke oder ähnlicher linearer Abmessungen / G01D MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE , Anzeigen oder Aufzeichnen in Verbindung mit Messen allgemein / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES |