The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 1997
Filed:
Jan. 11, 1996
Robert D Klauber, Fairfield, IA (US);
Erik B Vigmostad, Fairfield, IA (US);
Sensortech LP, Fairfield, IA (US);
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 time rate of change of stress in the member produced by a first loading event or series of events. A second signal is obtained which relates to the time rate of change of stress in the member produced by a second loading event or series of events. The first and second signals are compared to detect significant variations in 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. In another embodiment, the time rate of change of a single segment of an analog signal related to, but not directly correlated with, stress is used to determine rapid changes in load. In yet another embodiment, a statistical value derived from a plurality of signals is used to determine variation in load. Applications comprise internal combustion engine and driveline torque variation diagnostics, brake pedals, and suspension systems.