Effects of future engine variables on octane requirements
The spark-ignited IC engine will continue to be the most widely used automotive powerplant through the 1980's. Changes in octane requirements from current vehicles depend, in part, upon revisions necessary to comply with regulations on emissions and fuel economy. Octane, emissions, and fuel economy, for a specific engine design concept, are related by engine size and drivetrain selection and by calibration flexibility. Octane requirements could decrease if engine calibrations must be significantly compromised for emissions. Electronic engine control systems greatly expand calibration flexibility. Calibrations can be modified locally to solve specific problems without influencing operation elsewhere. Feedback control systems have added a new dimension to engine calibration. A knock sensor with spark timing control would allow every vehicle to be calibrated for BL knock on tank fuel, regardless of fuel octane, up to MBT timing. Octane requirements and ORI are being considered in future engine design concepts. The use of aluminum cylinder heads, reduced coolant temperature or lean burn provides little advantage in ORI. Differences in absolute octane requirements can be accomodated with minor calibration changes.
- Research Organization:
- Ford Motor Co., Dearborn, MI
- OSTI ID:
- 6429043
- Report Number(s):
- CONF-780902-P3
- Journal Information:
- Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States), Journal Name: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States) Vol. 23:3; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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