# US 8,770,019 B2 · Test rig for dynamic test assignments on internal combustion engines, and method for operating a test rig of this kind

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- Number: US 8,770,019 B2
- Document ID: US8770019B2
- Status: Granted
- Kind: B2
- Application number: 13/464,519
- Filed: 2012-05-04
- Published: 2012-11-15
- Granted: 2014-07-08
- Earliest claimed: 2011-05-09
- Assignees: AVL List GmbH
- Applicants: Engelbert Grünbacher; Helmut Kokal; Martin Schmidt; Luigi Del Re; Michael Paulweber
- Inventors: Engelbert Grünbacher; Helmut Kokal; Martin Schmidt; Luigi Del Re; Michael Paulweber
- Web page: https://patentgrep.com/patent/US8770019B2

## CPC

- G01M 15/044: {by monitoring power, e.g. by operating the engine with one of the ignitions interrupted; by using acceleration tests}
- G01M 15/05: by combined monitoring of two or more different engine parameters
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

## Abstract

A test rig for dynamic test assignments on internal combustion engines is equipped with a preferably electrical drive and/or loading device which is coupled to a control device for adapting and controlling setpoint values for a speed and a torque characteristic. For a test rig of this kind, in order to enable the setpoint values determined by a speed and a torque characteristic to be optimally adapted and controlled for the respective test assignment and so that they can be reproduced on the test rig in the best possible manner, the control device can be adapted in terms of adjusting the weighting of speed control to torque control.

## Claims

### Claim 1

A test rig for dynamic test assignments on internal combustion engines comprising an electrical drive and/or loading device, a control device to which the electrical drive and/or loading device is connected for adapting and controlling setpoint values for a speed and a torque characteristic, and a control element to which the control device is connected for adjusting the weighting of speed control to torque control.

### Claim 2 (depends on 1)

The test rig as claimed in claim 1, wherein the control element comprises a graphical user interface.

### Claim 3

A method for operating a test rig having at least one drive and/or loading unit for dynamic test assignments on an internal combustion engine, a drive and/or loading unit for controlling setpoint values for the characteristic of a least two variables of the internal combustion engine, comprising the step of utilizing a control device for dividing available control power between the internal combustion engine and the drive and/or loading unit in accordance with a specifiable and variable weighting.

### Claim 4 (depends on 3)

The method as claimed in claim 3, wherein in the event of a control demand which exceeds power reserves of the internal combustion engine, using power reserves of the drive and/or loading unit which is working at its power limits to support the internal combustion engine in accordance with the specifiable and variable weighting.

### Claim 5 (depends on 3)

The method as claimed in claim 3, comprising monitoring power limits of the internal combustion engine, and before these power limits are exceeded, modifying the setpoint values for at least one of the variables in such a way that the internal combustion engine and the drive and/or loading unit remain within the power limits.

### Claim 6 (depends on 3)

The method as claimed in claim 3, comprising modifying both setpoint values in such a way that the control device divides the available control power in accordance with the specified weighting.

### Claim 7 (depends on 6)

The method as claimed in claim 6, wherein in addition to adapting desired values, the control values which are necessary for an exact tracking of these modified values are also automatically calculated at the same time.

### Claim 8 (depends on 7)

The method as claimed in claim 7, using an anti-wind-up structure, with which feedback of a difference between the control point by the controller and a permissible value of the internal combustion engine, to divide the control power between the internal combustion engine and the drive and/or loading unit in accordance with the specifiable and variable weighting.

### Claim 9 (depends on 3)

The method as claimed in claim 3, wherein said at least two variables comprise speed and torque.