Control parameter adjustment device

• US 10,108,177 B2
• Filed: 06/18/2015
• Issued: 10/23/2018
• Est. Priority Date: 06/18/2015
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Fujita, Tomoya, Nagaoka, Kotaro, Ozawa, Masahiro
• Primary Examiner(s): Lin, Jason
• Assistant Examiner(s): Alvarez, Olvin Lopez
• Application Number:
  US15/100,372
• Publication Number:
  US 20170199510A1
• Time in Patent Office: 1,223 Days
• Field of Search: 700 31
• CPC Class Codes: G05B 11/32 with inputs from more than one sensing element; with outputs to more than one correcting element
• CPC Class Codes: G05B 13/041 in which a variable is automatically adjusted to optimise the performance
• CPC Class Codes: G05B 19/402 characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position G05B19/19 takes precedence
• CPC Class Codes: G05B 2219/32341 Grafcet model, graph based simulation
• CPC Class Codes: G05B 2219/41148 Model, from position, speed, acceleration derive compensation
• CPC Class Codes: G05B 2219/41154 Friction, compensation for friction
• CPC Class Codes: G05B 2219/42044 Adapt model as function of difference between real and calculated position

Abstract

A control parameter adjustment device includes a command-value generation unit that generates a position command; a servo control unit that calculates a drive command such that a response position of a driven object follows the position command; a correction model unit that generates a correction command for correcting a response error that is a difference between the position command and the response position by using a model expressed by two or more types of parameters; and a parameter search unit that corrects the model by using a combination of values of the parameters, by which the response error is minimized, among a plurality of combinations of values of the parameters. The control parameter adjustment device drives the driven object on the basis of the drive command and the correction command.

Claims

1. A control parameter adjustment device comprising:

a hardware processor; and

a non-transitory computer readable recording medium storing a program which, when executed by the hardware processor, causes the control parameter adjustment device to;

generate a position command;

calculate a drive command such that a response position of a driven object follows the position command;

generate, by using a model expressed by two or more different types of parameters, a correction command for correcting a response error that is a difference between the position command and the response position;

correct the model by using a combination of values of the parameters by which the response error is minimized, the combination of the values of the parameters being from among a plurality of combinations of the values of the parameters;

drive the driven object in accordance with the drive command and the correction command; and

receive a feedback signal indicative of the response position of the driven object from the driven object as the two or more different types of parameters are sequentially changed, and select the combination of the values of the parameters by which the response error is minimized based on the feedback signal, to thereby correct the model.

2. The control parameter adjustment device according to claim 1, wherein

two or more types of the parameters are dependent parameters that cannot express their influence on the response error as a linear expression of the parameters.

3. The control parameter adjustment device according to claim 1, wherein

the model is a model that expresses a quadrant projection caused during arc motions.

4. The control parameter adjustment device according to claim 1, wherein

the model is a transfer function model in which mechanical vibrations are approximated.

5. The control parameter adjustment device according to claim 1, wherein

in a case where a number of types of the parameters is two, a relation between a plurality of combinations of searched values of the parameters and the response error that corresponds to each of the combinations is illustrated by a three-dimensional graph.

6. The control parameter adjustment device according to claim 1, wherein

in a case where a number of types of the parameters is three or more,

a relation between a plurality of combinations of searched values of two types of the parameters and the response error that corresponds to each of the combinations is plotted in a three-dimensional graph, and

a plurality of the three-dimensional graphs corresponding to different values of parameters other than the two types of the parameters are displayed.

7. The control parameter adjustment device according to claim 1, wherein the non-transitory computer readable recording medium stores the program which, when executed by the hardware processor, further causes the control parameter adjustment device to:

correct the model further based on a signal of a sensor attached to the driven object.

8. A control parameter adjustment device comprising:

a hardware processor; and

a non-transitory computer readable recording medium storing a program which, when executed by the hardware processor, causes the control parameter adjustment device to;

generate a position command;

calculate a drive command such that a response position of a driven object follows the position command;

generate, by using a model expressed by two or more different types of parameters, a correction command for correcting a response error that is a difference between the position command and the response position;

correct the model by using a combination of values of the parameters by which the response error is equal to or less than an allowable value, the combination of the values of the parameters being from among a plurality of combinations of the values of the parameters;

drive the driven object in accordance with the drive command and the correction command; and

receive a feedback signal indicative of the response position of the driven object from the driven object as the two or more different types of parameters are sequentially changed, and select the combination of the values of the parameters by which the response error is equal to or less than the allowable value based on the feedback signal, to thereby correct the model.

9. The control parameter adjustment device according to claim 8, wherein the non-transitory computer readable recording medium stores the program which, when executed by the hardware processor, further causes the control parameter adjustment device to:

display motion trajectories based on searching for a plurality of different combinations of the values of the parameters by which the response error is equal to or less than the allowable value, the motion trajectories respectively corresponding to the different combinations of the values of the parameters; and

receive a combination of the values of the parameters selected by a user from among the different combinations of the values of the parameters.

10. The control parameter adjustment device according to claim 8, wherein the non-transitory computer readable recording medium stores the program which, when executed by the hardware processor, further causes the control parameter adjustment device to:

stop searching for the parameters at a time when the response error becomes equal to or less than the allowable value.

11. The control parameter adjustment device according to claim 8, wherein

two or more types of the parameters are dependent parameters that cannot express their influence on the response error as a linear expression of the parameters.

12. The control parameter adjustment device according to claim 8, wherein

the model is a model that expresses a quadrant projection caused during arc motions.

13. The control parameter adjustment device according to claim 8, wherein

the model is a transfer function model in which mechanical vibrations are approximated.

14. The control parameter adjustment device according to claim 8, wherein

in a case where a number of types of the parameters is two, a relation between a plurality of combinations of searched values of the parameters and the response error that corresponds to each of the combinations is illustrated by a three-dimensional graph.

15. The control parameter adjustment device according to claim 8, wherein

in a case where the number of types of the parameters is three or more,

a relation between a plurality of combinations of searched values of two types of the parameters and the response error that corresponds to each of the combinations is plotted in a three-dimensional graph, and

a plurality of the three-dimensional graphs corresponding to different values of parameters other than the two types of the parameters are displayed.

16. The control parameter adjustment device according to claim 8, wherein the non-transitory computer readable recording medium stores the program which, when executed by the hardware processor, further causes the control parameter adjustment device to:

correct the model further based on a signal of a sensor attached to the driven object.