US 12,352,617 B2Granted

Method and system for eccentric load error correction

AssigneesMettler-Toledo (Changzhou) Measurement Technology Ltd., Mettler-Toledo (Changzhou) Precision Instruments Ltd., Mettler-Toledo International Trading (Shanghai) Co., Ltd.

InventorsShenhui Wang, Yujuan Zha, Song Zhang, Genjun Ji, Qiang Fu, Jinkang Han, Jinli Li

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Abstract

Methods and systems for eccentric load error correction are disclosed. A plurality of weighing data sets for a weight having a mass value are obtained, where the weight is loaded at different positions on a weighing platform of a weighing device. Differences between each of the weighing data sets and the average value of the plurality of weighing data sets or the mass value of the weight are calculated. Sensor correction coefficients are calculated and updated when the maximum absolute value of the differences exceeds a pre-set threshold. The weighing data sets are updated. The above steps are repeated until the absolute values of all the differences are less than the pre-set threshold.

Claims12

Dependent claims

A method for correcting an eccentric load error of a weighing device having a weighing platform with one or more sensors, said method comprising the steps of:

obtaining, in a communication device, at least a first plurality of weighing data sets from each of the one or more sensors by loading a first weight having a first mass value at different positions on the weighing platform of the weighing device, each weighing data set comprising weight data from each of the one or more sensors;
and
using a processing device to:
calculate differences between each of the plurality of weighing data sets and an average value of either the plurality of weighing data sets or the mass value of the weight;
and
calculate sensor correction coefficients based on calculated differences;
and
update said sensor correction coefficients when a maximum absolute value of the calculated differences exceeds a pre-set threshold, and subsequently update the weighing data sets until absolute values of the calculated differences are less than the pre-set threshold;
obtaining at least one further plurality of weighing data sets by loading at least one further weight, the weights having different mass values when said weights are loaded at the plurality of different positions on the weighing platform;
and
using the processing device, for the first, and each further, plurality of weighing data sets, to:
calculate differences between each of the weighing data sets and the average values of either the plurality of weighing data sets or the mass values of the weights;
calculate a linear parameter by using the average values of the weighing data sets when the weights having different masses are loaded;
and
calculate the sensor correction coefficients by using the linear parameter.

12 more elements

A system for correcting an eccentric load error of a weighing device having a weighing platform with one or more sensors, said system comprising:

a communication device configured to obtain at least a first plurality of weighing data sets from each of the one or more sensors of the weighing device when a first weight having a first mass value is loaded at a plurality of different positions on the weighing platform, wherein each weighing data sets comprises weight data from each of the one or more sensors;
a processing device, programmed with software instructions which when executed configure the processing device to:
calculate differences between each of the first plurality of weighing data sets and an average value of either the first plurality of weighing data sets or the first mass value of the first weight;
calculate sensor correction coefficients based on the calculated differences;
and
update the sensor correction coefficients when a maximum absolute value of the calculated differences exceeds a pre-set threshold, and subsequently update each of the weighing data sets until the absolute values of the calculated differences are less than the pre-set threshold;
wherein the communication device is configured to obtain at least one further plurality of weighing data sets, from placement of at least one further weight having a different mass value when loaded at the different positions on the weighing platform;
and
wherein the processing device is programmed with software instructions, which when executed, configure the processing device to use all obtained weighing data sets to:
calculate differences between each of the further weighing data sets and the average values of either the plurality of weighing data sets or the mass values of the weights;
calculate a linear parameter by using the average values of the weighing data sets when the weights having the different mass values are loaded;
and
calculate and update the sensor correction coefficients by using the linear parameter.

10 more elements

Dependencies are inferred from the claim text.