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MAN Methanol Engines For Use In Buses
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Sector:
Event:
22nd FISITA Congress
Language:
English
Abstract
Originally the idea of using methanol as a fuel came into the limelight on the strength of basic considerations in respect of long-term conservation of energy in the transport sector. In recent times, however, the environmental aspects of methanol have taken precedence over that original goal. It is particularly in the range of heavy-duty commercial vehicles that methanol results in substantial reductions in particulate and Nox emissions. At MAN, the development of methanol engines is based on the Diesel engine. The problem associated with the poor self-igniting quality of methanol is solved in this case by high-voltage spark ignition. Such features as direct single-jet injection, unthrottled air intake and high compression have been taken over from the Diesel. The result is a stratified-charge engine with external ignition - also known as a “spark-assisted Diesel”. The system has been adopted for naturally aspirated and turbocharged intercooled versions of our 11.4 liter 6-cylinder engines which are suitable for underfloor installation in regular line., service buses. Both engines are equipped with oxidation converters and satisfy the recommended 1991 U.S. emission limits for city buses - limits which, especially with regard to particulates, can barely be reached even by Diesel engines equipped with exhaust filters. The energy consumption is comparable to that of the Diesel engine. At present, 12 naturally-aspirated 150 kW engines and 10 turbocharged 200 kW engines are in regular bus line service.
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Citation
Neitz, A., "MAN Methanol Engines For Use In Buses," SAE Technical Paper 885178, 1988, https://doi.org/10.4271/885178.Also In
References
- Rlaisdell, T. Jackson, M. Moyer, C. Unnasch, S. “California's Methanol Program” Evaluation Report Second Nov. 14 1986
- “Alternative Energien für den Straßenverkehr - Methanol, Voraussetzungen fur die Einführung von Alkoholkraftstoffen” Verlag TÜV-Rheinland Köln 1983
- Unnasch, S. Moyer, C. Jackson, M. Smith, K. “Emission Control Options for Heavy-Duty Engines” SAE Paper 861111 West Coast International Meeting Universal City, Ca. August 4-7 1986
- Neitz, A. Chmela, P. “Results of MAN-FM-Diesel Engines Operating on Straight Alcohol Fuels” 4th International Symposium on Alcohol Fuels Guarujà-SP Brazil Oct. 5-8 1980
- Neitz, A. Chmela, P. “The MAN Methanol Engine Powering City Buses” 5th International Alcohol Fuel Technology Symposium Auckland, New Zealand, New Zealand May 13-18 1982
- Neitz, A. Chmela, F. “Results of Further Development in the MAN Methanol Engine” 6th International Symposium on Alcohol Fuels Technology Ottawa, Canada May 21-25 1984
- Krumm, H. “Besonderheiten bei der Schmierung von Fahrzeugmotoren im Betrieb mit M100-Kraftstoff”, BMFT-Verbundprojekt Alternative Energien für den Straßenverkehr - Methanol Symposium der Technischen Akademie Esslingen 19.-21 Juni 1985