Granted Patent B2

US 12,650,291 · App. 18/261,525 · Granted Jun 9, 2026

Inventors: Alexander Schricker (Graz, AT); Jakob Moder (Unzmarkt, AT); Andreas Neubauer (Nestelbach, AT); Erwin Reisinger (Feldkirchen bei Graz, AT); Michael Messner (St. Ulrich bei Steyr, AT)

Assignee: AVL LIST GMBH

G01B7/31G01L1/16G01M1/24G01M15/02

Abstract

Claims (47)

1 . A method for correcting a misalignment of at least one shafting of a powertrain on a test bench, wherein at least one piezoelectric force sensor is arranged in a path of force via which a force flow can be transmitted between a load unit of the test bench and a drive unit of the powertrain or of the test bench during a transmission of power via the shafting, the method comprising:

performing, with the at least one piezoelectric force sensor, a force measurement in at least one plane and/or perpendicular to the at least one plane which is intersected by a rotational axis of the shafting;

analyzing, via a signal processing device, a measured value or a measured value progression of the force measurement for detecting a misalignment of the shafting;

determining, via the signal processing device, target values for a position correction of the load unit or the drive unit in order to minimize the misalignment, wherein the determining of the target values further comprises:

determining a bending moment or a bending moment curve on the shafting on the basis of the measured value or the measured value progression of the force measurement; and

determining a bending line of the shafting on the basis of the bending moment or the bending moment curve, wherein the target values are determined by way of the bending line; and

outputting, via the signal processing device, the target values.

2 . The method according to claim 1 , further comprising:

checking whether the bending moment or the bending moment curve on the shafting exceeds a threshold value, and either:

iteratively repeating the method if the threshold value is exceeded; or

terminating the method when the threshold value is not exceeded.

3 . The method according to claim 1 , further comprising:

disengaging a frictional connection between the load unit and the drive unit.

4 . The method according to claim 3 , wherein the disengaging of the frictional connection between the load unit and the drive unit includes opening a coupling of the shafting.

5 . The method according to claim 1 , further comprising:

changing a position of the load unit and/or the drive unit on the test bench on the basis of the target values outputted.

6 . The method according to claim 1 , further comprising:

establishing a frictional connection between the load unit and the drive unit.

7 . The method according to claim 1 , wherein a constant of the shafting is determined for the bending line by way of two force measurements with respect to respectively different positions of the drive unit or the load unit.

8 . The method according to claim 7 , wherein the constant of the shafting is defined by the product of a modulus of elasticity and a modulus of resistance of the shafting.

9 . The method according to claim 1 , wherein the rotational axis of the shafting is a rotational axis of a shaft of the shafting on which the force measurement is performed.

10 . The method according to claim 1 , wherein the force measurement is performed in a stationary state or a quasi-stationary state of the shafting.

11 . The method according to claim 1 , wherein the force measurement is monitored in that the measured value or the measured value progression is compared to a threshold value which is indicative of a critical shafting load, and wherein rotation of the shafting is stopped or no rotation is effected when the threshold value is exceeded.

12 . The method according to claim 1 , wherein the at least one piezoelectric force sensor includes a plurality of piezoelectric force sensors provided in the path of force, and wherein a force measurement of each of the plurality of piezoelectric force sensors is monitored.

13 . The method according to claim 1 , wherein a distinction is made during analysis between parallel offset and/or angular offset of the shafting in terms of the misalignment.

14 . The method according to claim 1 , wherein the plane is at least substantially perpendicular to the rotational axis.

15 . A non-transitory computer-readable medium including a computer program containing instructions which, when executed by a processor of a computer, prompts the computer program to:

analyze a measured value or a measured value progression of a force measurement for detecting a misalignment of at least one shafting of a powertrain on a test bench, wherein the force measurement is performed by at least one piezoelectric force sensor in at least one plane and/or perpendicular to the at least one plane which is intersected by a rotational axis of the shafting, the at least one piezoelectric force sensor being arranged in a path of force via which a force flow can be transmitted between a load unit of the test bench and a drive unit of the powertrain or of the test bench during a transmission of power via the shafting;

determine target values for a position correction of the load unit or the drive unit in order to minimize the misalignment, including to:

determine a bending moment or a bending moment curve on the shafting on the basis of the measured value or the measured value progression of the force measurement; and

determine a bending line of the shafting on the basis of the bending moment or the bending moment curve, wherein the target values are determined by way of the bending line; and

output the target values.

16 . A powertrain test bench, comprising:

a load unit connectable to a shafting to be tested, wherein the shafting is connectable to a drive unit;

at least one piezoelectric force sensor arranged in a path of force via which a force flow is transmitted from the load unit of the powertrain test bench during a transmission of power via the shafting and is configured to perform a force measurement in a plane and/or perpendicular to the plane which is intersected by a rotational axis of the shafting; and

a signal processing device in communication with the at least one piezoelectric force sensor, the signal processing device including a processor that:

analyzes a measured value or a measured value progression of the force measurement for detecting a misalignment of the shafting;

d determines target values for a position correction of the load unit or the drive unit in order to minimize the misalignment, wherein to determine the target values the processor further:

determines a bending moment or a bending moment curve on the shafting on the basis of the measured value or the measured value progression of the force measurement; and

determines a bending line of the shafting on the basis of the bending moment or the bending moment curve, wherein the target values are determined by way of the bending line; and

outputs the target values.

17 . The powertrain test bench according to claim 16 , wherein the powertrain test bench additionally comprises an adjusting device configured to translationally and/or rotationally change a position of the load unit or the drive unit,

wherein the processor of the signal processing device:

controls the adjusting device on the basis of the target values.

18 . The powertrain test bench according to claim 16 , wherein at least one of:

the plane is at least substantially perpendicular to the rotational axis; and

the target values are outputted by the processor via an interface of the signal processing device.

Assignments (3)

Priority Claims (1)

Continuity (1)

References Cited (68)