Stress and load variation detector

Details Stress and load variation detector Stress and load variation detector

1995-12-18

1997-11-11

Dougherty, Elizabeth L.

Measuring and testing

Dynamometers

Responsive to torque

73116, 73862333, G01L 302

Patent

active

056866720

ABSTRACT:
A method and apparatus to detect variations in load by comparing signals related to, but not necessarily accurately correlated with, stress/strain states of a load transmitting member. In one embodiment, a first signal is obtained relating to the stress in the member produced by a first loading event or series of events. A second signal is obtained which relates to the stress in the member produced by a second loading event or series of events. The first and second signals are compared to detect non-constant loading. Each of the two signals may be a composite of other signals. A magnetostrictive sensor may preferably be used to obtain the signals relating to the stress in the load transmitting member. The load may be applied force, torque, stress, strain, or deflection. Applications comprise internal combustion engine and driveline torque variation diagnostics, brake pedals, and suspension systems.

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patent: 4802368 (1989-02-01), Nordvall
patent: 4825709 (1989-05-01), Nordvall
patent: 5269178 (1993-12-01), Vigmostad et al.

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