Method and system for measuring interference in a checkweighing device

Patent metadata

Field	Value
Publication number	US-11846539-B2
Application number	US-202117238295-A
Country	US
Kind code	B2
Filing date	Apr 23, 2021
Priority date	Apr 30, 2020
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

A method and a system measure interfering influences on a checkweighing device. In the method, external interference data are obtained, as are interference data from the checkweighing device itself and interference data from an object being weighed, by calculating or mapping the weighing error data in the stationary state, in the operating state, and in the weighing state. The system for measuring the interference uses a meter and a processing apparatus. The meter and the processing apparatus perform an interference measurement and a compensation method. The amount of interference in the checkweighing device in each state and the amount of influence of the interference on the weighing performance is obtained, thereby facilitating the production, debugging, maintenance, and use of a checkweighing device.

First claim

What is claimed is:

1. A method for measuring interference in a checkweighing device in an at least partially automated fashion, said method comprising the steps of:
electronically obtaining weighing test data output from the checkweighing device after a weighing test time period of predetermined duration according to a predetermined number of weighing tests in each of: a stationary state of the checkweighing device, an operating state of the checkweighing device, and a weighing state of the checkweighing device;
determining, through a computerized statistical analysis of the obtained weighing test data, weighing error data in each of: the stationary state, the operating state, and the weighing state;
determining, by computerized calculating or mapping, interference data of: an external environment based on the weighing error data in the stationary state, components of the checkweighing device based on the weighing error data in the operating state, and an object being weighed based on weighing error data in the weighing state; and
at least one of:
calculating an interference compensation amount to compensate for a weighing result of the checkweighing device based on at least some of the interference data, and updating the weighing result based on the interference compensation amount; and
using, as parameters of a checkweighing compensation model to correct a weighing result of the checkweighing device, the interference data, and correcting the weighting result in accordance with the checkweighing compensation model.

2. The method of claim 1 , wherein:
the weighing test data is output continuously by the checkweighing device in either the stationary state or the operating state; and
the weighing test data is selected in segments, each segment having a duration equal to the predetermined weighing test time period, and the weighing test data segments are selected sequentially from the weighing test data in order of time, such that the weighing test data segments are equal in number to the predetermined number of weighing tests.

3. The method of claim 2 , wherein the weighing test data segments selected from the weighing test data are spaced apart from one another by a time interval.

4. The method of claim 1 , wherein:
a weight of the object being weighed is subtracted from each of the weighing test data before determining either a mean or variance of the weighing test data.

5. The method of claim 1 , wherein:
in a first situation:
the interference data of the external environment are obtained by calculating or mapping the weighing error data in the stationary state;
the interference data of components of the checkweighing device are obtained by calculating or mapping data obtained by subtracting the weighing error data in the stationary state from the weighing error data in the operating state; and
the interference data of the weighed object are obtained by calculating or mapping data obtained by subtracting the weighing error data in the operating state from the weighing error data in the weighing state; or

in a second situation:
the interference data of the external environment are obtained by calculating or mapping the weighing error data in the stationary state;
the interference data of components of the checkweighing device are obtained by calculating or mapping data obtained after subtracting the interference data of the external environment from the weighing error data in the operating state; and
the interference data of the weighed object are obtained by calculating or mapping data obtained after subtracting each of the interference data of the external environment and the interference data of components of the checkweighing device from the weighing error data in the weighing state.

6. The method of claim 1 , wherein:
the interference data in the step of at least one of calculating the interference compensation amount to compensate for the weighing result of the checkweighing device; and
using, as parameters of the checkweighing compensation model to correct the weighing result of the checkweighing device comprises the interference data of each of: the external environment, the components of the checkweighing device, and the weighed object.

7. A system for measuring interference in a checkweighing device, said system comprising:
a meter, configured to electronically obtain by measurement, a weighing test data output from the checkweighing device after a predetermined weighing test time period, repeatedly, and according to a predetermined number of weighing tests in each of: a stationary state, an operating state, and a weighing state; and
a processing apparatus, configured to, in an at least partially automated fashion:
statistically analyze the weighing test data obtained by the meter to obtain weighing error data in the stationary state, weighing error data in the operating state, and weighing error data in the weighing state,
obtain, by calculating or mapping, interference data of the external environment using weighing error data in the stationary state, interference data of components of the checkweighing device using the weighing error data in the operating state, and interference data of a weighed object using the weighing error data in the weighing state, and
at least one of:
calculate an interference compensation amount based on the interference data of one or more of: the external environment, the components of the checkweighing device, and the weighed object to compensate for a weighing result of the checkweighing device, and update the weighing result based on the interference compensation amount; and
use, as parameters of a checkweighing compensation model to correct the weighing result of the checkweighing device, the interference data of one or more of: the external environment, the components of the checkweighing device, and the weighed object, and update the weighing result based on the checkweighing compensation model.

8. The system of claim 7 , wherein:
the meter continuously obtains weighing test data from the checkweighing device when the checkweighing device is in either the stationary state or in the operating state; and
the processing apparatus or the meter sequentially selects, from the weighing test data, weighing test data segments with durations equal to a predetermined weighing test time period in order of time, and selects a number of the weighing test data segments that is the same as the predetermined number of weighing tests.

9. The system of claim 8 , wherein the weighing test data segments, selected by the processing apparatus or the meter, are spaced apart from one another by a time interval.

10. The system of claim 8 , further comprising:
a display device for displaying the interference data of the external environment, the interference data of components of the checkweighing device, and the interference data of the weighed object, which are obtained by the processing apparatus through calculation or mapping.

11. The system of claim 8 , wherein:
the processing apparatus, if calculating the interference compensation amount uses the interference data of each of: the external environment, the components of the checkweighing device, and the weighed object; and
the processing apparatus if using the interference data as the parameters of the checkweighing compensation model to correct the weighing result of the checkweighing device, uses the interference data of each of: the external environment, the components of the checkweighing device, and the weighed object.

12. A storage medium, characterized by comprising a stored program that, when running, controls an apparatus where the storage medium is l

Assignees

• Mettler Toledo Changzhou Prec Instruments Ltd
• Mettler Toledo Changzhou Measurement Technology Ltd
• Mettler Toledo Int Trading Shanghai Co Ltd

Inventors

• Wang Shenhui
• Wu Huifang
• Cai Ming
• Han Qi
• Qiu Dongjie
• Jiang Wenjun
• Cui Jindong
• Zhu Bin

Classifications

• G01G15/006 Primary

  using electrical, electromechanical, or electronic means not covered by G01G15/001, G01G15/02, G01G15/04 · CPC title

• G01G11/006

  Special taring or checking devices therefor (devices for determining tare weight in general G01G23/14) · CPC title

• G01G19/387

  for combinatorial weighing, i.e. selecting a combination of articles whose total weight or number is closest to a desired value · CPC title

• G01G23/01 Primary

  Testing or calibrating of weighing apparatus · CPC title

• G01G23/10 Primary

  by electric or magnetic means · CPC title