Possibilities for Optimization of Injection Parameters to Improve Engine Performance of Heavy Duty and Industrial Engines

Authors

Olaf E. Herrmann, Ludger Ruhkamp , Thomas Körfer FEV-Motorentechnik GmbH, Stefan Pischinger, Sascha Schönfeld, Lehrstuhl für Verbrennungskraftmaschinen, RWTH-Aachen

Year

2007

Summary

For further reduction of the NOx-raw emission levels of truck- and industrial engines the combustion development at FEV concentrates on achieving higher EGR-rates also by reduction of the air fuel ratio. Additional targets are to achieve this NOx-reduction without particulate emission and BSFC disadvantages and additional with advantages in NVH while remaining a high power output of the engine. To achieve this one major key is to significantly improve the air utilization of the combustion process, which can be achieved by increase of injection pressure. With the FEVAHDCS combustion system the increase of injection pressure can be used even more effective and allows A/F-ratio’s significantly below 1.4 at injection pressures above 2500 bar. By additionally using the increased flexibility of modern injection systems for optimization of pilot and post injection further improvement of particulate and NOx emission, BSFC and NVH is possible. For the calibration, due to the increased number of parameters, DOE methods need to be applied. Additionally investigations with the FEV-First injection system show further potentials by variable control of the injection rate shape with regard to NVH, emissions and BSFC.

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