Thorsten Hergemöller

Analysis of a lab-based measure concept for the acoustics of high pressure fuel pumps

The request for constantly decreasing noise levels in the interior of modern vehicles leads to highest requirements in terms of their vibroacoustic performance. Here, the analysis of the transfer paths both of structural and airborne noise evoked by the tire/road contact is as significant as the characterization of the sound and vibration emitted by present-day drivelines and all its components.

Quality characteristics of hydraulic injection quantity measurements – Transferability of non-engine tests to real systems

In the development of future engine technologies with continually lower emissions in connection with rising performance requirements, the injector represents a key component. In today’s common rail systems, high rail pressures and multiple injections are state of the art. Requirements for a precise and reproducible metering of quantities injected, particularly in the field of microquantities, are therefore continually increasing. These demands require high quality measuring techniques for injection systems. Injection quantity measurements are performed in a laboratory, which can recreate the real conditions in the engine only within certain limits. In addition, the measuring device affects injection. The measurement of injectors is the basis for testing singlecylinder and multi-cylinder engines and input parameters for simulations. In order to guarantee good transferability of laboratory measurements to real systems, any influencing variables that must be taken into account here will be investigated. The aim is to minimize the deviations of the systems from one another and thus to improve the quality of the results.