Systems and methods for programming motion control

• US 7,765,025 B2
• Filed: 08/14/2007
• Issued: 07/27/2010
• Est. Priority Date: 11/14/2003
• Status: Active Grant

• Current Assignee: Siemens Corp. (Siemens AG)
• Original Assignee: Siemens AG, Siemens Corp. (Siemens AG)
• Inventors: Ludwig, Hartmut, Wynblatt, Michael, Arman, Farshid, Wang, Lingyun
• Primary Examiner(s): Mackey; Patrick
• Assistant Examiner(s): Butler; Michael E.
• Application Number:
  US11/893,166
• Publication Number:
  US 20080039971A1
• Time in Patent Office: 1,078 Days
• Field of Search: 700/228
• US Class Current: 700/228
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05B 2219/35585 Motion command profile
• CPC Class Codes: G05B 2219/45054 Handling, conveyor

Abstract

Systems, methods and computer program code for the programming of motion control in load transportation systems are provided which may include programming motion control by specifying desired load motions.

Claims

1. A method, for moving one or more loads using a plurality of load actuators coupled to a processor programmable with actuator commands to manipulate said plurality of load actuators so as to result in said plurality of load actuators actuating a behavior of said one or more loads, said method comprising the steps of:

receiving commands specifying a desired behavior of the one or more loads, the commands based on a received input of a desired velocity to move the one or more loads;

determining that the desired velocity is not obtainable;

in response to determining that the desired velocity is not obtainable, determining, using stored and/or entered capabilities information of said system and/or said plurality of load actuators, actuator commands that result in an obtainable behavior of the one or more loads based on a capability of the plurality of load actuators, and an acceleration limit associated with the one or more loads, wherein a velocity of the obtainable behavior is different than a velocity of the desired behavior; and

moving the one or more loads at the velocity associated with the obtainable behavior.

2. The method of claim 1, further comprising the step of:

determining a current behavior of the one or more loads.

3. The method of claim 2, wherein the determined actuator commands are determined at least in part based on the current behavior of the one or more loads.

4. The method of claim 2, wherein the step of determining the current behavior of the one or more loads comprises:

predicting a future position of the one or more loads based on the determined actuator commands applied to the one or more load actuators.

5. The method of claim 2, the step of determining the current behavior of the one or more loads comprises:

determining a nearest neighboring load of the one or more loads.

6. The method of claim 2, the determining the current behavior of the one or more loads comprises:

determining a distance between the one or more loads and at least one other load.

7. The method of claim 1, further comprising the step of:

determining when the desired behavior is not substantially similar to any obtainable behavior and then adjusting the desired behavior toward said obtainable behavior prior to applying determined actuator commands to said plurality of load actuators.

8. The method of claim 7, further comprising the steps of:

determining current information associated with the current behavior and/or limits of the one or more loads;

determining a behavior profile associated with the one or more loads using the current information; and

adjusting the obtainable behavior toward said behavior profile associated with the one or more loads when a difference between the obtainable behavior and the current behavior exceeds a threshold.

9. The method of claim 1, wherein said desired behavior comprises a desired velocity.

10. The method of claim 1, wherein said desired behavior comprises:

a desired position.

11. The method of claim 1, wherein the one or more loads comprise a plurality of loads and said step of determining comprises:

determining at least one of a desired position and a desired velocity for at least one of the plurality of loads;

determining, for each other load of the plurality of loads, at least one of a desired position and a desired velocity, wherein the at least one of a desired position and a desired velocity of each load is relative to another load in the plurality of loads; and

determining a velocity for the one or more load actuators that substantially causes each load in the plurality of loads to achieve the at least one of the desired position and the desired velocity.

12. The method of claim 1, wherein the one or more loads comprise a plurality of loads and said step of determining comprises:

grouping at least two of the plurality of loads into one or more virtual collections;

determining at least one of a desired position and a desired velocity for the at least two loads in the one or more virtual collections; and

determining a velocity for the one or more load actuators that substantially causes the at least two loads in the one or more virtual collections to achieve the at least one of the desired position and the desired velocity.

13. The method of claim 12, wherein the grouping comprises:

partitioning the loads in the plurality of loads into groups based at least in part on the geometric positions of the loads.

14. The method of claim 13, wherein the partitioning comprises:

selecting a load in the plurality of loads having the most extreme geometric position.

15. The method of claim 8, further comprising the steps of:

determining if the one or more loads will collide with at least one other load; and

determining said actuator commands that result in the obtainable behavior of the one or more loads that is close to achieving the desired behavior while avoiding a collision between the one or more loads.

16. The method of claim 1, wherein the one or more load actuators includes a matrix of load actuators.