Avl List Gmbh

Josef Mayrhofer

Martin Schmidt

Helmut Kokal

Dirk Denger

Luigi Del Re

Matthias Dank

Gerald Hochmann

Stephen Jones

Stefan Dragaschnig

Joachim Schmidt

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 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

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Josef Mayrhofer