CO₂ Reduction in Everyday Operation - Influence of Engine Calibration

Authors

Dipl.-Ing. T. Dobes, Dr. P. Kapus, Dr. P. Schöggl, Dipl.-Ing. H. Jansen, Dipl.-Ing. E. Bogner, AVL List GmbH, Graz

Year

2008

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 672

Summary

“Downsizing” and “downspeeding” by using turbocharging and direct injection technologies offer a high potential for reducing fuel consumption of Gasoline engines. The resulting additional system costs are moderate compared to other technological approaches. Low fuel consumption values that are achieved over the standard driving cycle can only be obtained in everyday operation as well if low full-load enrichments and good transient responses in combination with long gear ratios can be realized.

This paper compares different vehicles with 4-cylinder turbocharged engines over a NEDC and a customer consumption lap using fuel-saving and sporty driving styles.

In addition, one of the vehicles is used as an example to show how the vehicle character can be changed from “sporty” to “fuel saving” by using different calibration strategies without changing the hardware. By adjusting the calibration the driver can be enabled to actually use the potential of high medium-pressures at low engine speeds for a fuel-saving driving style without having to give up the desired sportiness.

The different calibrations are evaluated in everyday operation and compared to objectively measured driveability values.

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