Avl List Gmbh

Piezocryst Advanced Sensorics Gmbh

Martin Schmidt

Helmut Kokal

Erwin Reisinger

Luigi Del Re

Dirk Denger

Michael Paulweber

Josef Mayrhofer

Maximilian Bier

Felix Pfister

Hans Erlach

Engelbert Grünbacher

Matthias Dank

Stephen Jones

Harald Nonn

Jakob Moder

Gerald Hochmann

Klaus Pfeiffer

Stefan Dragaschnig

Joachim Schmidt

Gerhard Pickl

Thomas E Passenbrunner

Martin Walcher

Stefan Kanya

Mario Sassano

Peter M Ziegler

Roland Rathner

Hannes Trogmann

Helmut Schneiderbeck

Lukas Quurck

Clemens Reitze

Di Josef Mayrhofer

Di Helmut Kokal

Thomas Ernst Passenbrunner

Horst Hammerer

Di Stefan Dragaschnig

DC-to-DC converter for converting an input direct voltage Vinto at least one variable output direct voltage V, comprising at least two switched converter units (') each having at least one electronically controllable half bridge (′), and a control unit () which is designed to control the half bridges (′) in a modulation method with a variable period duration and a variable duty cycle, wherein a dedicated current sensor (′) is provided in each of the output lines (′) of the converter units (′), and the control unit () is designed to receive the amperages′ of the converter units (′) measured by the current sensors (′), and to control the converter units (′) with duty cycles which differ from one another, in particular to activate individual converter units (′) with duty cycles which are reduced compared to other converter units (′), or not to activate these, wherein the output lines (′) of the converter units (′) are interconnected after the current sensors (′) so that the currents of the output lines (′) are summed, wherein the control unit () is designed to calculate the sum current I, and that the control until () is designed to compare the sum current Iwith the nominal currents I, I′ and to activate that converter unit (′) whose assigned current sensor (′) has a nominal current which is greater than the sum current I, but lies closest to the sum current I, or to activate those converter units (′) the sum of whose nominal currents is greater than the sum current, but lies closest to the sum current, so that the amperages in the output lines (′) of the activated converter units (′) are in each case below, but as close as possible to, the nominal current I, I′ of the assigned current sensors (′).

DC-to-DC converter comprising a current sensor arrangement

Measuring arrangement for determining the bridge currents of a switched electrical converter unit (), in which, in a modulation process, at least two electronic half bridges (') are switched with temporally offset actuation signals by a control unit (), comprising a measuring unit () that is connected to current sensors (′), wherein the current sensors (′) are arranged in the output or input lines of the half bridges (′) in order to measure the bridge currents, and the measuring unit () is connected to the control unit () for temporal synchronisation, wherein the measuring unit () is designed to define measurement times (′) of the current sensors (′) which are temporally synchronised with the actuation signals of the half bridges (′), as well as an inverter arrangement having such a measuring arrangement.

Measuring assembly for an inverter and inverter assembly

The invention relates to a converter assembly comprising at least two converters (') and a control unit () connected to the converters (′), wherein the control unit () is designed, continuously or at discrete time intervals, to transmit to the converters (′) their permissible electrical power range, in particular their minimum power value Pand/or their maximum power value P, to determine the current power balance of the individual converters (′) or to receive it from same, and to adjust the permissible electrical power range of the converters (′) in such a way that the power balance of the entire converter assembly does not leave a predefined range. The invention also relates to a method for operating a converter assembly of this type.

Converter assembly and method for operating a converter assembly

The invention relates to a method and a drivetrain test bench for detecting an imbalance and/or a misalignment of at least one shaft assembly of a drivetrain during operation on a test bench, wherein a first piezoelectric force sensor is arranged in a flow of force generated by a transmission of power between a load unit of the test bench and a drive unit of the drivetrain or the test bench, and which is transmitted by of the shaft assembly, wherein the first force sensor realizes a first force measurement in a first plane and/or perpendicular to the first plane as is intersected by a rotational axis of the shaft assembly and preferably at least substantially perpendicular to the rotational axis, and wherein the first force measurement and/or a rotational angle determination for the shaft assembly are used to detect an imbalance, and/or a misalignment of the shaft assembly.

Method and drivetrain test bench for detecting an imbalance and/or a misalignment

The invention relates to a converter assembly for converting a DC voltage from a DC voltage source, e.g. a battery, a fuel cell or a DC voltage intermediate circuit, into an N-phase AC voltage, e.g. for supplying an N-phase electric machine, comprising a connected inverter unit () having a number M of electronically controllable half bridges (') for each of the N phases, wherein M is greater than one, a control unit () controlling the half bridges (′) which is designed to activate the half bridges (′) in a phase-offset manner with a switching frequency fT, wherein the phases are connected to a respective winding (″) of a common-mode choke () with a common magnetic core for damping electrical common-mode interference, and wherein the outputs of the half bridges (′), supplying said phases, are interconnected via interleaving chokes (′), wherein a first resistance-damped capacitor circuit () is provided at the output of the interleaving chokes (′) forming a first LC filter stage (), and a second resistance-damped capacitor circuit () is provided at the output of the common-mode choke (″) forming a second LC filter stage ().

Converter assembly

Aspects of the present disclosure are directed to a method for controlling the torque of a drive unit on a test stand. Accordingly, one embodiment of the present disclosure is a method for controlling an inner effective torque of the drive unit via a unit controlling unit, wherein an inner effective desired torque is determined from the given courses of the rotational speed and the torque of the drive unit and a known mass inertia of the drive unit, and an inner effective actual torque is determined during the operation of the drive unit on the test stand from measured values of the load machine and/or of the drive unit and/or of the connecting shaft and/or of a known mass inertia of the drive unit.

Test run method and test stand

Aspects of the present disclosure are directed to controlling an inner effective torque or an effective torque of a drive unit via a unit controlling unit. In some embodiments, the control method may include providing desired values for the inner effective torque or the effective torque and determining actual values for the inner effective torque or the effective torque during operation of the drive unit on a test stand, and in that actuating dynamics of the drive unit are taken into account in the control by means of a transfer function by correcting the desired values of the control with the transfer function or in that for controlling the inner effective torque or the effective torque of the drive unit, a feed forward control of a manipulated variable of the drive unit is used.

Method for performing a test run with a test stand

The present teaching includes a speed control of a side shaft of a drive train connected to a dynamometer on a drive train test stand in which a torque (M) caused by the longitudinal force (F) calculated in a simulation model is additionally transferred to the control unit, and from this a compensation torque (M) is calculated in the control unit as a function of the longitudinal force (F) caused by the torque (M) and a deviation (A) between a moment of inertia (J) of the dynamometer and a moment of inertia (J) of the simulated vehicle wheel, the control unit calculates a torque (M) from the setpoint speed (n) with a speed controller and a torque (M) to be set with the dynamometer is calculated as the sum of the compensation torque (M) and the torque (M) calculated by the speed controller and set by the dynamometer.

Method for controlling a load machine during a test run with a drive train and test stand

To make the handling of a tire model for controlling a test run on a test bench simpler and more flexible and thus more practicable, it is provided that at least one longitudinal velocity of a tire is calculated in a first simulation unit with a first simulation model, and the longitudinal velocity is provided to a second simulation unit, and a longitudinal force and/or a rolling resistance torque of the tire are calculated with a second simulation model in the second simulation unit on the basis of the longitudinal velocity, and said longitudinal force and/or rolling resistance torque are used to calculate at least one target dyno value for a drive control unit of a load machine of the test bench.

Method and device for performing a test run on a test stand

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

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

A method for monitoring performance test stands having at least one load assembly, which is coupled to a test subject, such as an internal combustion engine, vehicle drive, or drive train, includes ascertaining multiple, possibly derived parameters, which characterize the current state of the test stand, and evaluating them automatically in regard to the stability of the operating state of the test stand. In order to allow reliable cognition of instabilities in performance test stands of greatly varying configurations in the typical control modes and the reliable online monitoring of the stability of the control circuits on performance test stands in real time with CPU use which conserves resources as much as possible, the standardized parameters are weighted and consolidated into a single index which is characteristic for the current state, and this index is provided for the display and/or as a control variable for the real-time test stand controller.

Growing community of inventors

Langen, Germany

Martin Schmidt