Test bench and method for carrying out a test run on a test bench

Patent metadata

Field	Value
Publication number	US-11726004-B2
Application number	US-202017633040-A
Country	US
Kind code	B2
Filing date	Aug 3, 2020
Priority date	Aug 5, 2019
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

Various aspects of the present disclosure are directed to a test bench and methods for carrying out a test run on a test bench. In one example embodiment, a test run method includes: connecting a test object to a load machine, specifying a target torque for a torque controller by a test bench automation unit according to the test run, adjusting an actual torque of the load machine by the torque controller, specifying a test object control variable for the test object by a test object controller, determining an actual rotational speed of the load machine, determining at least one deviation of at least one attribute of the actual rotational speed from at least one threshold value, and based on the at least one deviation, and determining at least one additive torque correction value and superimposing the at least one additive torque correction value on the target torque.

First claim

The invention claimed is:

1. A method for carrying out a test run on a test bench including the following steps:
connecting a test object to a load machine on the test bench,
specifying a target torque (T_soll) for a torque controller by a test bench automation unit according to the test run,
adjusting an actual torque (T_ist) of the load machine by the torque controller (R 2 ), and
specifying a test object control variable (SW) for the test object by a test object controller (R 1 ),
determining an actual rotational speed (n) of the load machine,
determining at least one deviation (a, a 1 , a 2 ) of at least one attribute of the actual rotational speed (n) from at least one threshold value (G), and
based on the at least one deviation (a, a 1 , a 2 ), determining at least one additive torque correction value (Tk) and superimposing the at least one additive torque correction value (Tk) on the target torque (T_soll).

2. The method according to claim 1 , characterized in that the value of the actual rotational speed (n) is used as a first attribute of the actual rotational speed (n), and in that an upper and/or lower rotational speed threshold (no, nu) is provided as a threshold value (G).

3. The method according to claim 1 , characterized in that an actual rotational speed gradient (dn) is used as a second attribute of the actual rotational speed (n), and in that an upper and/or lower rotational speed gradient threshold (dno, dnu) is provided as a threshold value (G).

4. The method according to claim 1 , characterized in that an actual torque (T_ist) is determined and fed back to the torque controller for controlling the actual torque (T_ist).

5. The method according to claim 1 , characterized in that a target value (W) is specified for the test object controller by the test bench automation unit in order to set an actual test object variable (M) of the test object by specifying the test object control variable (SW).

6. The method according to claim 5 , characterized in that the actual test object variable (M) of the test object is determined and fed back to the test object controller for controlling the actual test object variable (M).

7. The method according to claim 1 , characterized in that at least one threshold value (G) is fixed.

8. The method according to claim 1 , characterized in that at least one threshold value can be changed.

9. The method according to claim 8 , wherein the at least one threshold value is changed based upon a known system variable.

10. A test bench for carrying out a test run, the test bench comprising:
a load machine configured to be coupled to a test object;
a torque controller configured to adjust an actual torque (T_ist) of the load machine;
a test bench automation unit configured to specify a target torque (T_soll) for the torque controller according to the test run;
a test object controller configured to specify a test object control variable (SW) for the test object;
a rotational speed determination unit configured for determining an actual rotational speed (n) of the load machine;
at least one comparison unit configured to determine at least one deviation (a, a 1 , a 2 ) of at least one attribute of the actual rotational speed (n) from at least one threshold value (G);
at least one correction unit configured to determine, based on the at least one deviation (a, a 1 , a 2 ), at least one additive torque correction value (Tk) and superimpose it on the target torque (T_soll).

11. The test bench according to claim 10 , further including a first correction unit with a rotational speed correction controller, and a first superposition unit, wherein the rotational speed correction controller is configured to
receive a first deviation (a 1 ) of the actual rotational speed (n) from a rotational speed threshold (no, nu) from a first comparison unit (V 1 ),
based on the first deviation (a 1 ), determine a torque correction value (Tk), and
superimpose the torque correction value on a control torque (T) via the first superposition unit.

12. The test bench according to claim 11 , characterized in that the rotational speed correction controller is configured to be activated, and/or deactivated.

13. The test bench of claim 12 , wherein the rotational speed correction controller can be activated when a first rotational speed threshold is exceeded, and/or deactivated when the speed falls below a second rotational speed threshold.

14. The test bench of claim 11 , wherein the rotational speed controller is a PI controller.

15. The test bench according to claim 9 , further including a second correction unit with a rotational speed gradient correction controller, and a second superposition unit, wherein the rotational speed gradient correction controller is configured to
receive a second deviation (a 2 ) of an actual rotational speed gradient (dn) from a rotational speed gradient threshold (dno, dnu) from a second comparison unit (V 2 ), and
determine a torque correction value (Tk) from the second deviation (a 2 ), and
superimpose the torque correction value (Tk) on a control torque (T) via the second superposition unit.

16. The test bench according to claim 15 , characterized in that the rotational speed gradient correction controller can be activated, and/or deactivated.

17. The test bench of claim 16 , wherein the rotational speed gradient correction controller can be activated when a first rotational speed gradient threshold is exceeded, and/or deactivated when the speed falls below a second rotational speed gradient threshold.

18. The test bench according to claim 10 , further including a torque determination unit configured to determine the actual torque (T_ist) and communicatively connected to the torque controller in order to feed the actual torque (T_ist) back to control the actual torque (T_ist).

19. The test bench according to claim 10 , characterized in that the test bench automation unit is configured to specify a target value (W) for the test object controller, and in that the test object controller is configured to specify an actual test object variable (M) of the test object by specifying the test object control variable (SW).

20. The test bench according to claim 19 , further including an actual variable determination unit configured to determine an actual test object variable (M) of the test object, wherein the actual variable determination unit is communicatively connected to the test object controller and the actual variable determination unit is further configured and arranged to feed the actual test object variable (M) back to the test object controller in order to control the actual test object variable (M).

Assignees

• Avl List Gmbh

Inventors

• Bier Maximilian
• Quick Andreas

Classifications

• G01M13/026 Primary

  Test-benches of the mechanical closed-loop type, i.e. having a gear system constituting a closed-loop in combination with the object under test · CPC title

• G01L3/22

  electrically or magnetically actuated · CPC title

• G01M15/042

  by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 · CPC title

• G01M15/02 Primary

  Details or accessories of testing apparatus · CPC title

• G01M15/046

  by monitoring revolutions (for detecting misfire G01M15/11) · CPC title