Low-Emission Diesel Concept

Authors

Dr.-Ing. Thomas Wintrich, Dipl.-Ing. Stefan Rothe, Dipl.-Ing. Kilian Bucher, Dipl.-Ing. Hans-Jürgen Hitz,
Robert Bosch GmbH, Stuttgart

Summary

The requirements to comply with legal vehicle emission limits have changed significantly with the introduction of measurements to be performed under real driving conditions (Real Driving Emissions, RDE). Against this background a comprehensive approach covering the entire powertrain is of paramount importance in order to
simultaneously meet the performance, consumption, noise and emission targets. Even without any major hardware adjustments on the state-of-the-art Euro 6 configuration, an optimized engine management and the resulting improvement of the overall system
set-up have already led to significant progress on the emission behavior.

In this context the fuel injection equipment (FIE) offers a high degree of freedom regarding the injection strategy applied. Together with a high dosing accuracy it thus plays an essential role in the overall optimization of the diesel-engine combustion process. Furthermore, the enhancement of the system by a closed-loop function supports keeping a high dosing accuracy over the entire lifetime and in spite of any external physically based interference, especially during the warm-up phase.

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