Method of operating a transport system and transport system

Patent metadata

Field	Value
Publication number	US-12091265-B2
Application number	US-202318144921-A
Country	US
Kind code	B2
Filing date	May 9, 2023
Priority date	May 10, 2022
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A method of operating a transport system, in particular a multi-carrier system, which comprises a plurality of linear motors, which are arranged in a row and have a guide track, and a plurality of transport elements that are movable along the guide track by means of the linear motors, has the following steps:generating a travel job for a first one of the transport elements for travelling along at least a part section of the guide track,generating a first movement profile of the first transport element for the travel job based on predetermined movement characteristic values,matching the first movement profile with a second movement profile of a second transport element directly in front of the first transport element and determining whether a predetermined minimum distance between the first transport element and the second transport element is fallen below during the execution of the travel job,updating the first movement profile to maintain the minimum distance if it has been determined that the minimum distance is fallen below, andcontrolling the linear motors to move the first transport element in accordance with the first movement profile.

First claim

The invention claimed is:

1. A method of operating a transport system that comprises a plurality of linear motors, which are arranged in a row and have a guide track, and a plurality of transport elements that are movable along the guide track by means of the linear motors, wherein the method comprises:
generating a travel job for a first one of the transport elements for travelling along at least a part section of the guide track,
generating a first movement profile of the first transport element for the travel job based on predetermined movement characteristic values,
matching the first movement profile with a second movement profile of a second transport element directly in front of the first transport element and determining whether a predetermined minimum distance between the first transport element and the second transport element is fallen below during execution of the travel job,
updating the first movement profile to maintain the minimum distance if it has been determined that the minimum distance is fallen below, and
controlling the linear motors to move the first transport element in accordance with the first movement profile,
wherein the first movement profile is newly generated when it is determined that a generation event has occurred, and
wherein the generation event is a change in jerk of the second transport element.

2. The method in accordance with claim 1 , wherein, when the generation event occurs, a third movement profile of a third transport element directly behind the first transport element is furthermore updated.

3. The method in accordance with claim 1 , wherein the matching of the first movement profile with the second movement profile comprises calculating a distance trajectory of a distance between the first transport element and the second transport element.

4. The method in accordance with claim 1 , wherein the speed of the first transport element is reduced to the speed of the second transport element or less when the first movement profile is being updated.

5. The method in accordance with claim 1 , wherein the movement characteristic values comprise a maximum speed, a maximum acceleration, and/or an amount of jerk.

6. The method in accordance with claim 1 , wherein the generation and/or the updating of the first movement profile comprises determining time sections with a constant jerk and calculating a maximum actual acceleration and a maximum actual speed.

7. The method in accordance with claim 1 , wherein the transport system is a multi-carrier system.

8. A transport system that comprises a plurality of linear motors, which are arranged in a row and have a guide track, and a plurality of transport elements that can be moved along the guide track by means of the linear motors,
further comprising a control unit that is configured to carry out a method of operating a transport system that comprises a plurality of linear motors, which are arranged in a row and have a guide track, and a plurality of transport elements that are movable along the guide track by means of the linear motors, wherein the method comprises:
generating a travel job for a first one of the transport elements for travelling along at least a part section of the guide track,
generating a first movement profile of the first transport element for the travel job based on predetermined movement characteristic values,
matching the first movement profile with a second movement profile of a second transport element directly in front of the first transport element and determining whether a predetermined minimum distance between the first transport element and the second transport element is fallen below during execution of the travel job,
updating the first movement profile to maintain the minimum distance if it has been determined that the minimum distance is fallen below, and
controlling the linear motors to move the first transport element in accordance with the first movement profile,

wherein the first movement profile is newly generated when it is determined that a generation event has occurred, and
wherein the generation event is a change in jerk of the second transport element.

9. The transport system in accordance with claim 8 wherein the transport system is a multi-carrier system.

10. A method of operating a transport system that comprises a plurality of linear motors, which are arranged in a row and have a guide track, and a plurality of transport elements that are movable along the guide track by means of the linear motors, wherein the method comprises:
generating a travel job for a first one of the transport elements for travelling along at least a part section of the guide track,
generating a first movement profile of the first transport element for the travel job based on predetermined movement characteristic values,
matching the first movement profile with a second movement profile of a second transport element directly in front of the first transport element and determining whether a predetermined minimum distance between the first transport element and the second transport element is fallen below during execution of the travel job,
updating the first movement profile to maintain the minimum distance if it has been determined that the minimum distance is fallen below, and
controlling the linear motors to move the first transport element in accordance with the first movement profile,

wherein the matching of the first movement profile with the second movement profile comprises calculating a distance trajectory of a distance between the first transport element and the second transport element.

11. A method of operating a transport system that comprises a plurality of linear motors, which are arranged in a row and have a guide track, and a plurality of transport elements that are movable along the guide track by means of the linear motors, wherein the method comprises:
generating a travel job for a first one of the transport elements for travelling along at least a part section of the guide track,
generating a first movement profile of the first transport element for the travel job based on predetermined movement characteristic values,
matching the first movement profile with a second movement profile of a second transport element directly in front of the first transport element and determining whether a predetermined minimum distance between the first transport element and the second transport element is fallen below during execution of the travel job,
updating the first movement profile to maintain the minimum distance if it has been determined that the minimum distance is fallen below, and
controlling the linear motors to move the first transport element in accordance with the first movement profile,

wherein the generation and/or the updating of the first movement profile comprises determining time sections with a constant jerk and calculating a maximum actual acceleration and a maximum actual speed.

Assignees

• Schneider Electric Ind Sas

Inventors

• Hofmann Steffen
• Heid Jürgen

Classifications

• B60L2240/16

  longitudinal · CPC title

• B60L2240/12

  Speed · CPC title

• B60L15/005

  for control of propulsion for vehicles propelled by linear motors · CPC title

• B61B13/12

  Systems with propulsion devices between or alongside the rails, e.g. pneumatic systems (cable traction B61B9/00; car shunting devices B61J) · CPC title

• B60L13/03 Primary

  Electric propulsion by linear motors · CPC title