Magnetostrictive torque sensor air gap compensator

Details Magnetostrictive torque sensor air gap compensator Magnetostrictive torque sensor air gap compensator

1994-04-05

1996-03-05

Chilcot, Richard

Measuring and testing

Dynamometers

Responsive to torque

731181, G01L 302

Patent

active

054957745

ABSTRACT:
Disclosed are a method and apparatus for minimizing or eliminating the effect of air gap variation on the output signal of a magnetostrictive stress/torque signal. An RLC drive circuit is utilized by choosing appropriate circuit parameters and drive frequency such that the flux reducing effect from increasing air gap due to increase in magnetic reluctance is offset by a flux increasing effect from a concomitant reduction in eddy currents. The invention is particularly suited to cross design magnetostrictive sensors and to automotive engine diagnostics applications such as misfire, knock, and roughness detection.

REFERENCES:
patent: 2912642 (1959-11-01), Dahle
patent: 4503714 (1985-03-01), Winterhof
patent: 4566338 (1986-01-01), Fleming et al.
patent: 4589290 (1986-05-01), Sugiyama et al.
patent: 4803885 (1989-02-01), Nonomura et al.
patent: 4939937 (1990-07-01), Klauber et al.
patent: 4979399 (1990-12-01), Klauber et al.
patent: 5269178 (1993-12-01), Vigomostad et al.
patent: 5287735 (1994-02-01), Klauber et al.
patent: 5323659 (1994-06-01), Wakamiya et al.
patent: 5351555 (1994-10-01), Garshens
SAE Technical Paper #900264 "Magnetostrictive Torque Sensors-Comparison of Branch, Cross, & Solenoidal Designs", W. Fleming, Feb. 26-Mar. 2, 1990.
SAE Technical Paper #870472 "Measurement of Engine Torque with the Intra-Bearing Torque Sensor", Nonomura et al, Feb. 1987.

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