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Figure: Measurements on the auxiliary units

MEASUREMENTS ON THE AUXILIARY UNITS

The system analysis of auxiliary units and the belt starter-generator includes the measurement and evaluation of slip and dynamic behavior of an auxiliary unit system on an internal combustion engine. The variables to be recorded include the speed of the torsional vibration dampers and belt pulleys, the belt force and belt dynamics, especially on the idle run of the belt. Another important variable is the load on the assemblies, which include the alternator and the air-conditioning compressor. In the case of a belt-starter-generator system, the dynamic change in the system behavior when switching between the idle run and the load run must also be analyzed.

In hybrid drives, the state of charge of the battery plays an essential role. Here, most of these variables are available with sufficient resolution on the CAN bus. Thus, they can be recorded by means of the ROTEC CAN card. In BAS systems, the starting and stopping processes of the engine as well as the switching of the starter generator between engine and generator operation (recuperation) represent one of the most difficult dynamic states, which is why sensor technology with detection of the direction of rotation is required to record the correct speed ratios. For this task ROTEC provides appropriate sensor solutions such as encoder adaptation modules or quadruple sensors.

Keywords: auxiliary units, slip and dynamic behvaior, speed of the torsional vibration dampers, load on the assemblies, dynamic change

TIME RANGE ANALYSES

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  • Belt loads
  • Bearing forces
  • Tensioner preload and damping forces
  • Force vector calculation depending on the tensioner position
  • Slip behavior in the overall transmission
  • Start and stop behavior
  • Speed gradient and peak torque evaluations

ANALYSES IN THE SPECTRAL RANGE

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  • Resonance behavior of the tensioner
  • Resonance behavior of the overall transmission
  • Automatic generation of result tables
  • Decoupling behavior

MEASUREMENT
TECHNOLOGY

for torsional vibration analysis

MEASURING AND
ANALYSIS SOFTWARE

flexible and powerful tool for data acquisition,
analysis, display and output

WHERE CAN TORSIONAL VIBRATIONS
BECOME CRITICAL IN THE E-POWERTRAIN?

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