Patent Number: 6,528,990

Title: Magnetostrictive linear displacement transducer for a vehicle steering system

Abstract: A steering angle sensing system 1, 26 for measuring the angle position of a vehicle steering wheel is disclosed which uses at least one position magnet 7, 8, G1, G2, G3 coupled to the rotary movement of the steering wheel 2' as a transducer, and a magnetostrictive transducer 4, 35 as a measuring device and a second measuring device 70, 90 for measuring the angular movement of the vehicle wheels. Magnetostrictive transducer 4, 35 includes an elongated, magnetostrictive waveguide 9, 33 extending over a defined arc section, with mode converter 10, 35 for detecting magnetostrictively generated voltage pulses at one end. The waveguide 9, 33 is stationary related to the rotary movement of at least one position magnet 7, 8, G1, G2, G3 so that, when turning the steering wheel 2', the magnet field of one position magnet 7, 8, G1, G2, G3 is applied to waveguide 9,33 in different positions dependent of the position of the steering wheel 2'. The second measuring device 70, 90 may measure gross changes to distinguish 360.degree. or less, for example 270.degree., rotation whereas the steering wheel measuring device 1, 26 measures fine changes of the vehicle steering wheel 2'.

Inventors: Nyce; David S. (Apex, NC)

Assignee: MTS Systems Corporation

International Classification: B60G 17/015 (20060101); B60G 17/019 (20060101); F15B 15/00 (20060101); F15B 15/28 (20060101); G01D 5/48 (20060101); G01B 7/00 (20060101); G01B 7/02 (20060101); G01B 7/14 (20060101); G01B 007/14 ()

Expiration Date: 03/04/2020