Method and device for the cyclic digital transfer of a position value of a moving object having inertial mass

Patent metadata

Field	Value
Publication number	US-10697768-B2
Application number	US-201816042778-A
Country	US
Kind code	B2
Filing date	Jul 23, 2018
Priority date	Dec 10, 2010
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A method and device for the cyclic digital transfer of a position value of a moving object having inertial mass, the value range of the transferred position value being limited in such a way that no whole revolution or, in the case of a linear motion, other complete period that is conditional upon mechanical conditions is mappable, and the actual position is generated by detecting, in an evaluation unit, instances of the value range being exceeded.

First claim

What is claimed is:

1. A method for the digital transfer of a position value of a movable object having inertial mass, comprising:
(a) measuring, at a first time, a first angular position value of the movable object, the first position value including a first partial angular value within a partial angular range, a first subangular value within a subangular value range, and a first fine angular value within a fine angular range, each partial angle range including a predetermined number of subangular values, each subanglular range including a predetermined number of fine angular values;
(b) calculating an estimated second angular position value, at a second time, based on the first angular position value and a first angular velocity of the movable object over a time period between the first time and the second time, the estimated second angular position value including an estimated second partial angular value, an estimated second subangular value, and an estimated second fine angular value;
(c) measuring, at the second time, a second subangular value of the movable object and a second fine angular value of the movable object without measuring a partial angular value of the movable object at the second time;
(d) deriving two possible second angular position values, each possible second angular position value including the measured second subangular value and the measured second fine angular value and different partial angular values; and
(e) determining a single one of the two possible second angular position values as an actual second angular position value based on a maximum change of angular velocity of the movable object within the time period between the first time and the second time.

2. The method according to claim 1 , further comprising determining a second angular velocity of the movable object at the second time based on a difference between the first angular position value and the actual second angular position value and the time period between the first time and the second time.

3. The method according to claim 1 , wherein the maximum change of angular velocity of the movable object over the time period between the first time and the second time is less than half of the partial angular range.

4. The method according to claim 1 , wherein a first one of the two possible second angular position values includes the estimated second partial angular value and a second one of the two possible second angular position values includes a partial angular value adjacent the estimated second partial angular value.

5. The method according to claim 1 , further comprising transferring the determined actual second angular position value to an evaluation circuit.

6. The method according to claim 5 , wherein the evaluation circuit include control electronics of an inverter and/or converter.

7. The method according to claim 1 , wherein the predetermined number of subangular values in each partial angle range and the predetermined number of fine angular values in each subangular range are equal.

8. The method according to claim 1 , wherein the partial angular values are measured in a first encoder track, the subangular values are measured in a second encoder track, and/or the fine angular ranges are measured in a third encoder track.

9. The method according to claim 1 , wherein the (a) measuring, (b) calculating, (c) measuring, (d) deriving, and (e) determining are periodically repeated over time, are cyclically repeated, and/or are repeated at regular time intervals.

10. The method according to claim 1 , wherein the partial angular range of the movable object over one complete revolution consists of 32 partial angular values, each subangular range consists of 4 subangular values, and each fine angular range consists of 4 fine angular values.

11. A system, comprising:
a control unit; and
a movable object having inertial mass;
wherein the control unit is adapted to perform a method for the digital transfer of a position value of the movable object, the method including:
(a) measuring, at a first time, a first angular position value of the movable object, the first position value including a first partial angular value within a partial angular range, a first subangular value within a subangular value range, and a first fine angular value within a fine angular range, each partial angle range including a predetermined number of subangular values, each subanglular range including a predetermined number of fine angular values;
(b) calculating an estimated second angular position value, at a second time, based on the first angular position value and a first angular velocity of the movable object over a time period between the first time and the second time, the estimated second angular position value including an estimated second partial angular value, an estimated second subangular value, and an estimated second fine angular value;
(c) measuring, at the second time, a second subangular value of the movable object and a second fine angular value of the movable object without measuring a partial angular value of the movable object at the second time;
(d) deriving two possible second angular position values, each possible second angular position value including the measured second subangular value and the measured second fine angular value and different partial angular values; and
(e) determining a single one of the two possible second angular position values as an actual second angular position value based on a maximum change of angular velocity of the movable object within the time period between the first time and the second time.

12. The system according to claim 11 , wherein the method includes determining a second angular velocity of the movable object at the second time based on a difference between the first angular position value and the actual second angular position value and the time period between the first time and the second time.

13. The system according to claim 11 , wherein the maximum change of angular velocity of the movable object over the time period between the first time and the second time is less than half of the partial angular range.

14. The system according to claim 11 , wherein a first one of the two possible second angular position values includes the estimated second partial angular value and a second one of the two possible second angular position values includes a partial angular value adjacent the estimated second partial angular value.

15. The system according to claim 11 , wherein the method includes transferring the determined actual second angular position value to an evaluation circuit.

16. The system according to claim 15 , wherein the evaluation circuit include control electronics of an inverter and/or converter.

17. The system according to claim 11 , wherein the predetermined number of subangular values in each partial angle range and the predetermined number of fine angular values in each subangular range are equal.

18. The system according to claim 11 , further comprising a first encoder track adapted for measurement of the partial angular values, a second encoder track adapted for measurement of the subangular values, and/or a third encoder track adapted for measurement of the fine angular ranges are measured in a third encoder track.

19. The system according to claim 11 , wherein the (a) measuring, (b) calculating, (c) measuring, (d) deriving, and (e) determining are periodically repeated over time, are cyclically repeated, and/or are repeated at regular time intervals.

20. The system accor

Assignees

• Sew Eurodrive Gmbh & Co

Inventors

• Simon Olaf

Classifications

• G01D21/00 Primary

  Measuring or testing not otherwise provided for · CPC title

• G05B15/02

  electric · CPC title

• H04Q9/00

  Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom · CPC title

• H03M1/26

  with weighted coding, i.e. the weight given to a digit depends on the position of the digit within the block or code word, e.g. there is a given radix and the weights are powers of this radix · CPC title

• H04Q2209/84

  Measuring functions · CPC title