Creep-compensated weighing apparatus
AssigneeReliance Electric Company
InventorNeil C. Griffen
Life of this patent
Estimating the term…
Abstract
A digital scale compensated for creep by first obtaining and storing a mathematical representation of creep as a function of time for the particular scale. The current "creep state" of the scale is continually calculated, stored and used to correct the current weight indication for creep. The current creep state is obtained by calculating the increment of creep since the previous determination of creep state and combining it with the stored previous creep state.
Claims28
Weighing apparatus compensated for creep comprising a weighing mechanism, means for storing the creep state of said weighing mechanism, means for obtaining a representation of the weight on the weighing mechanism, means for predicting the creep increment resulting from said stored creep state and said weight, means for combining said creep increment with said stored creep state to determine a current creep state, means for combining said current creep state with said weight representation to provide a corrected weight representation, and means for storing said current creep state in place of said stored creep state.
Weighing apparatus compensated for creep comprising a weighing mechanism, means for obtaining a representation of the weight on the weighing mechanism, means for predicting the creep state of the weighing mechanism using said weight representation, and means for combining the creep state with the weight representation to provide an indication of the weight on the weighing mechanism compensated for creep.
A method of correcting the output of a weighing apparatus for creep comprising the steps of determining a mathematical representation of creep as a function of time for said weighing apparatus, continually obtaining representations of the weight on the weighing apparatus, continually predicting the creep state of the weighing apparatus utilizing the weight representations and said mathematical representation, and combining a predicted creep state with a weight representation to compensate for the effects of creep.
A method of correcting the output of a digital scale for creep which comprises repetitively performing the following sequence of steps:
- (1) storing the creep state of the scale,
- (2) obtaining an indication of the weight on the scale,
- (3) predicting the creep increment since storing the creep state,
- (4) combining the creep increment with the stored creep state to provide a current creep state,
- (5) using the result of the combination to correct the weight indication.
Creep-compensated weighing apparatus comprising a weighing mechanism, means for storing a mathematical representation of creep as a function of time for said weighing mechanism, means for continually obtaining representations of the weight on the weighing mechanism, means for continually predicting the creep state of the weighing mechanism utilizing said weight representations and said mathematical representation, and means for combining a predicted creep state with a weight representation to provide an indication of the weight on said weighing mechanism compensated for creep
A method of correcting the output of a force measuring apparatus for creep comprising the steps of obtaining a representation of the force applied to the force measuring apparatus, predicting the creep state of the force measuring apparatus using said force representation, and combining the predicted creep state with the force representation to provide an indication of the force applied to said force measuring apparatus compensated for the effects of creep.
Dependencies are inferred from the claim text.