Avl List Gmbh

Piezocryst Advanced Sensorics Gmbh

Virtual Vehicle Research Gmbh

Helmut Kokal

Luigi Del Re

Martin Schmidt

Alexander Schricker

Dirk Denger

Michael Paulweber

Josef Mayrhofer

Engelbert Grünbacher

Franz Dreisiebner

Michael Hirschler

Martin Benedikt

Matthias Dank

Peter Langthaler

Gerald Steinmaurer

Mario Propst

Stephen Jones

Gerald Hochmann

Thomas E Passenbrunner

Martin Monschein

Mario Sassano

Stefan Dragaschnig

Hannes Trogmann

Joachim Schmidt

Patrick Falk

Peter Holzhammer

Gregor Griesser

Ronald Prettenthaler

Martin Stockreiter

Luigi Giordano

Gorka Arce Alonso

Josef Zehetner

Thomas Ernst Passenbrunner

The invention relates to a method for adjusting a piezoelectric torque sensor of a measuring apparatus, which can be part of a test bench, for determining a torque applied to a test piece due to a force flux, wherein the measuring apparatus comprises a piezoelectric torque sensor and a second torque sensor based on a different measuring principle which is designed to continuously detect static torques, wherein the measuring apparatus is configured such that both torque sensors measure torques in the force flux, whereby a target measurement signal of the piezoelectric torque sensor is determined on the basis of a torque measurement by the second torque sensor, and whereby the detected measurement signal of the piezoelectric torque sensor is adjusted and output on the basis of the determined target measurement signal.

Method for adjusting a piezoelectric torque sensor

The invention relates to a measuring system for determining a force and/or a torque on a torque-transmitting shaft, wherein: the measuring system has at least three, in particular at least four, piezoelectric elements each having a preferred direction and each being arranged at different positions about a rotational axis of the shaft in a force flow transmitted via the shaft, said arrangement being such that a force of the force flow acts, in particular exclusively, on the piezoelectric elements; the preferred directions each lie parallel to or in a single plane which is intersected by the rotational axis; and the preferred directions of at least two, in particular at least three, of the piezoelectric elements are oriented neither parallel nor antiparallel to one other.

Measuring system and method for determining a force and/or a torque on a torque-transmitting shaft

The invention relates to a measuring device for determining force and/or torque on a torque-transmitting shaft which is supported by a bearing device, in particular a machine, the output and/or input shaft of which is formed by the torque-transmitting shaft. The measuring device has at least two, preferably three or four, piezoelectric elements and a fixing device, wherein the fixing device supports the piezoelements and is designed in such a way that a force, in particular shear force, can be measured between the bearing device and a supporting device for supporting the bearing device by means of the piezoelements.

Measuring device and method for determining a force and/or a torque on a torque-transmitting shaft

The invention relates to a device and to a method for controlling a test stand arrangement having a specimen and having a loading machine, which is connected to the specimen by a connecting shaft. An estimated value (T) for for the internal torque (T) of the specimen is determined and, from the estimated value (T), while taking into account a natural frequency (f) and a delay, a damping signal (T) is determined and fed back into the control loop.

Method and device for controlling a test stand arrangement

An electric motor () of a drive train () of a hybrid vehicle is controlled by determining the shaft torque (T) of a current work cycle (n) of an included internal combustion engine () and feeding the shaft torque (T) to a compensation controller (K) which has stored the shaft torque (T(n&#x2212;1)) of a preceding work cycle (n&#x2212;1) of the internal combustion engine, and calculating a compensated shaft torque (T) from the shaft torque (T(n)) of the current work cycle (n), the shaft torque (T(n&#x2212;1)) of a previous work cycle (n&#x2212;1), and the shaft torque of a previous work cycle (n&#x2212;1) shifted by a system delay, which compensated shaft torque (T) is linked to a target torque (T) predefined by a higher-level control unit () to determine the controlling torque (T) for the electric motor.

Method for compensating rotational irregularities of an internal combustion engine of a drive train of a hybrid vehicle

A hydrodynamic torque generator for test benches includes at least one inlet valve and at least one outlet valve, and a control device for valve positioning, the control device including an open-loop feed-forward controller and a closed-loop feedback controller.

Hydrodynamic torque generator for test benches and control method therefor

To enable testing of a starter motor on a test bench with an electrical dynamometer as a replacement for a real combustion engine, a simulation unit () is used in which a mathematical model of the combustion engine is implemented, and the simulation unit () determines a new load setpoint (n, T) using the mathematical model from measured actual values (&#x3c6;, n, T) of the operation of the electrical dynamometer () at every scanning time point of a regulation, which new load setpoint (n, T) is fed to the regulator () of the electrical dynamometer.

Method and test bench for testing a starter motor

When arrangements with a repeating working cycle such as, for example, in the case of engine test benches, are being controlled, resonances which have to be damped by the control system are often excited by the test specimen (for example an internal combustion engine) in the working range of the arrangement. The invention proposes for this purpose a control concept in which a modified actual value ris determined from a current actual value rof the control system and from a predicted imminent system-delay-free actual value on the basis of the actual value of a previous working cycle, and said modified actual value ris fed to the control system.

Method and control arrangement for controlling a controlled system with a repeating working cycle

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.

Test rig for dynamic test assignments on internal combustion engines, and method for operating a test rig of this kind

A test stand arrangement includes at least one electric motor () connected to a test specimen for driving and/or loading the test specimen, and a control arrangement for the or each electric motor. In order to be able to create the connection of the drive train and vehicle simulation with the real, vehicle-specific combustion and dynamic behavior of the engine, at least one model for a multi-mass flywheel is implemented in the control arrangement, from which model at least a part of the control requirement for the or each electric motor is calculated and which model contains at least the two masses of the primary and secondary side of the multi-mass flywheel and a substitute model for the or each bow spring, and an algorithm is implemented in the control arrangement that analyzes the model for a multi-mass flywheel by means of an integrated time step method.

Test stand arrangement with simulation model of multi-mass flywheel

A test stand assembly includes an electric machine () for driving and/or loading a test object (), which is connected by a connecting shaft () having an adapter flange () to the electric machine (). The assembly has a constant, predetermined moment of inertia, and the mass and the moment of inertia of the adapter flange () are selected in such a manner that the resonant frequency of the system formed of test object (), adapter flange (), connecting flange (), and electric machine () for driving and/or loading the test object () lies between the idle frequency and the partial load frequency of the test object ().

Test stand assembly including connecting shaft having adaptor flange with selected mass and moment of inertia

The course of torque transmitted though a driving shaft () between torque generating device () to be tested and a driving or loading mechanism () is determined during an identification phase in the completely constructed test bench with the use of a rotating driving or loading mechanism () at pseudo-stochastic rotational speeds. Determined are thereby parameters describing in a real and current manner the dynamic behavior of the driving shaft () whereby the parameters are used as an influence in further testing.

Method to test a dynamic torque-generating device and a device to determine the dynamic behavior of a driving shaft

In a test bench design consisting at least of an internal combustion engine () having its own sensor technology, actuator technology and control devices, a dynamometric brake (), and a test bench computer () controlling the internal combustion engine () and the dynamometric brake (), whereby the computer () calculates the control variables for the internal combustion engine () and the dynamometric brake () based on set point defaults, the object to operate the internal combustion engine () with the assistance of the dynamometric brake () in the same way as the engine would be operated by the user in a selected vehicle and with the driving profile to be set by the user is achieved by conducting a predefined measurement prior to the actual measurement, which cannot be performed precisely by the user himself, and based on the measurement, parameters of a calculation specification () of set point defaults of the control variables are to be determined under consideration of the characteristics of the test bench and then set on the test bench computer () without changing the parameter setting of the test bench computer () or of the control device of the internal combustion engine.

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Graz, Austria

Helmut Kokal