Abstract: 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.

Abstract: 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.

Abstract: 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 (TE,est) for for the internal torque (TE) of the specimen is determined and, from the estimated value (TE,est), while taking into account a natural frequency (f0) and a delay, a damping signal (TDamp) is determined and fed back into the control loop.

Abstract: 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.

Abstract: 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.

Abstract: A method and a device for estimating the torque ripple TTR of an electric motor connected to a load. An ideal rotational speed ?ideal of the electric motor is determined from an actuating torque Tset_UUT for the electric motor. An output torque Tshaft is measured at the load and a moment of mass inertia J of the electric motor in the controlled system of a control circuit. The ideal rotational speed ?ideal is adjusted by a controller of the control circuit on the basis of the real rotational speed ?UUT measured at the electric motor in such a way that the current torque ripple TTR is generated as a manipulated variable of the controller.

Abstract: 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 (TE,est) for for the internal torque (TE) of the specimen is determined and, from the estimated value (TE,est), while taking into account a natural frequency (f0) and a delay, a damping signal (TDamp) is determined and fed back into the control loop.

Abstract: The invention relates to a method for testing a brake system (B) of a vehicle (F), wherein simulation results are used for the adaptation of a test on a test stand (P). The object of the invention is to provide a method for improving the test of the brake system (B). In accordance with the invention, this is achieved by creating a first flow simulation model (S1) of the vehicle (F) from geometric data (G) and by creating a second flow simulation model (S2) of the test stand (P), and a first simulation result is calculated with at least one first input variable by using the first flow simulation model (S1), and a change (?) of at least one second input variable in the second simulation model (S2) is carried out until a second simulation result of the second simulation model (S2) is achieved which corresponds essentially to the first simulation result.

Abstract: An electric motor (2) of a drive train (1) of a hybrid vehicle is controlled by determining the shaft torque (TW) of a current work cycle (n) of an included internal combustion engine (3) and feeding the shaft torque (TW) to a compensation controller (K) which has stored the shaft torque (TW(n?1)) of a preceding work cycle (n?1) of the internal combustion engine, and calculating a compensated shaft torque (Tkomp) from the shaft torque (TW(n)) of the current work cycle (n), the shaft torque (TW(n?1)) of a previous work cycle (n?1), and the shaft torque of a previous work cycle (n?1) shifted by a system delay, which compensated shaft torque (Tkomp) is linked to a target torque (Tsoll) predefined by a higher-level control unit (15) to determine the controlling torque (Tstell) for the electric motor.

Abstract: 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.

Abstract: 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 (20) is used in which a mathematical model of the combustion engine is implemented, and the simulation unit (20) determines a new load setpoint (ns, Ts) using the mathematical model from measured actual values (?i, ni, Ti) of the operation of the electrical dynamometer (3) at every scanning time point of a regulation, which new load setpoint (ns, Ts) is fed to the regulator (21) of the electrical dynamometer.

Abstract: So as to make the co-simulation of subsystems of an overall system (1), which are reciprocally coupled by way of coupling variables (y1, y2), real-time capable, a mathematical model (M) of the subsystems (TS1, TS2) which is valid at the current operating point of the overall system (1) is ascertained from input variables (x1, x2) and/or measured variables (w1, w2) of the subsystems (TS1, TS2) based on a method of data-based model identification and, from this model (M), the coupling variables (y1, y2) are extrapolated for a subsequent coupling time step and made available to the subsystems (TS1, TS2).

Abstract: For a control of an electric motor (2) of a drive train (1) of a hybrid vehicle, which control can be implemented and carried out in a simple manner, it is proposed to detect the shaft torque (TW) of the engine shaft (11) of the current work cycle (n) of the internal combustion engine (3) and to feed it to a compensation controller (K), to store the shaft torque (TW(n?1)) of a preceding work cycle (n?1) of the internal combustion engine (3) in the compensation controller (K), and to calculate a compensated shaft torque (Tkomp) from the shaft torque (TW(n)) of the current work cycle (n), the shaft torque (TW(n?1)) of a previous work cycle (n?1) and the shaft torque of a previous work cycle (n?1) shifted by a system delay, which compensated shaft torque (Tkomp) is linked to a target torque (Tsoll) predefined by a higher-level control unit (15) to determine the controlling torque (Tstell).

Abstract: 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 rist—mod is determined from a current actual value rist—akt of 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 rist—mod is fed to the control system.

Abstract: To enable testing of a starter motor on a test beach with an electrical dynamometer as a replacement for the real combustion engine, a simulation unit (20) is provided in which a mathematical model of the combustion engine is implemented, and the simulation unit (20) determines a new load setpoint (ns, Ts) using the mathematical model from measured actual values (?i, ni, Ti) of the operation of the electrical dynamometer (3) at every scanning time point of the regulation, which new load setpoint (ns, Ts) is fed to the regulator (21).

Abstract: A hydrodynamic torque generator (3) for test benches is provided with at least one inlet valve and at least one outlet valve and with at least one control device for valve positioning coupled to these valves. By implementing a control system, which consists of an open-loop feed-forward controller and a closed-loop feedback controller, in the control device, a machine of this kind can also be used in dynamic test benches.

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.

Abstract: A test stand arrangement includes at least one electric motor (4) 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.

Abstract: A test stand assembly includes an electric machine (4) for driving and/or loading a test object (1), which is connected by a connecting shaft (2) having an adapter flange (3) to the electric machine (4). The assembly has a constant, predetermined moment of inertia, and the mass and the moment of inertia of the adapter flange (3) are selected in such a manner that the resonant frequency of the system formed of test object (1), adapter flange (3), connecting flange (2), and electric machine (4) for driving and/or loading the test object (1) lies between the idle frequency and the partial load frequency of the test object (1).

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.