Weighing method and storage medium thereof

Patent metadata

Field	Value
Publication number	US-11519777-B2
Application number	US-201816640576-A
Country	US
Kind code	B2
Filing date	Jun 29, 2018
Priority date	Aug 29, 2017
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

In a weighing method, a weight (W) of a measured object (7) is measured. A roll angle (r) and a pitch angle (p) of a weighing scale platform (100) are read. The coordinates of a placement position (x0, z0) of the measured object are acquired. A first error (error1) caused by a weighing state according to the roll angle and the pitch angle is calculated. A second error (error2) caused by a weighing position according to the coordinates of the placement position, the roll angle (r) and the pitch angle (p) is also calculated. From these, a corrected weight (Wc) is determined.

First claim

What is claimed is:

1. A method of weighing an object on a scale comprising a weighing sensor, a weighing state identification system, a weighing position acquisition structure and a weighing process control unit, the method comprising the steps of:
measuring, by the weighing sensor, a weight of the object on a weighing scale platform;
reading, by the weighing state identification system, a roll angle (r) and a pitch angle (p) of the weighing scale platform;
acquiring, by the weighing position acquisition structure, coordinates of a placement position (x 0 , z 0 ) of the object; and
calculating, by the weighing process control unit, a corrected weight (Wc) of the object by:
calculating a first error (error1) caused by a weighing state according to the roll angle (r) and the pitch angle (p)
calculating a second error (error2) caused by a weighing position according to the coordinates of the placement position (x 0 , z 0 ) of the object, the roll angle (r) and the pitch angle (p), and
applying the equation:
Wc=W /((1+error1)(1+error2))

2. The weighing method of claim 1 , wherein the step of calculating the first error (error1) is by the formula:

error
⁢

⁢
1

=

(

1
,
r
,

r
2

)

*

(

a
11

a
12

a
13

a
21

a
22

a
23

a
31

a
32

a
33

)

*

(

1

p

p
2

)

wherein, a 11 , a 12 , . . . , and a 33 are weighing state correction parameters.

3. The weighing method of claim 1 , wherein the step of calculating the second error (error2) is by the formula:

error
⁢

⁢
2

=

(

1
,

x
0

,

z
0

,

x
0

⁢

z
0

,

x
0

⁢

z
0
2

,

x
0
2

⁢

z
0

,

x
0
2

,

z
0
2

)

*

(

a
11

a
12

a
13

…

a
18

a
21

a
22

a
23

…

a
28

…

Assignees

• Mettler Toledo Prec Instrument Company Limited
• Mettler Toledo Measurement Tech Company Limited
• Mettler Toledo Int Trading Shanghai Co Ltd
• Mettler—Toledo Int Trading Shanghai Co Ltd

Inventors

• Wu Jianwei
• Lin Hongzhi
• Zhang Ying
• Xie Guojun
• Qian Zheng

Classifications

• G01G23/002 Primary

  Means for correcting for obliquity of mounting (for pendulum-weight apparatus G01G1/16) · CPC title

• G01G23/00 Primary

  Auxiliary devices for weighing apparatus · CPC title