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Application Of The AVL High Compression Lean Burn System To Passenger Car Engines
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Event:
22nd FISITA Congress
Language:
English
Abstract
The AVL-HCLB ( High Compression Lean Burn) Combustion System development work, carried out on a single cylinder research engine and a first generation 4IL engines for passenger car application, has led to intensified R&D acitivity on soma particular features of the AVL System to enable its full fuel economy potential to be realized -while still conforming with current and proposed exhaust emission standards.
It is shown that, compared with cast iron, aluminum is the better cylinder head material also for HCLB engines. A Variable Swirl Intake Port developed at AVL has enabled WOT ( Wide Open Throttle) performance and upper part load NOx emissions characteristics to be improved.
By means of an air flow/fuel flow and engine speed governed engine management system, the upper part load BSFC and NOX emission trade off of the HCLB-englnes has been optimized. An EGR-valve with a non linear flow characteristic has proven to be an important contributing factor in this respect. Finally, SEFI ( Sequential Fuel Injection)-timing strategies are discussed, and their influence on combustion, exhaust emissions and on transient enrichment fuel requirements is shown.
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Citation
Quissek, F., Mikulic, L., and Bandel, W., "Application Of The AVL High Compression Lean Burn System To Passenger Car Engines," SAE Technical Paper 885092, 1988, https://doi.org/10.4271/885092.Also In
References
- Quissek, F. “Development of a High Compression Ratio Spark Ignition Engine for Unleaded Fuel” SAE 865034 presented at XXI-FISITA-Congress Belgrade, Jugoslavia 1986
- Quissek, F. Bandel, W. Mikulic, L. “The AVL High Compression Lean Burn Engine - Engine Development and Passenger Car Application” presented at SAE-Congress March 1988 Detroit, USA
- Fraidl, G.K. “Mixture Preparation and Engine Performance with Intermittent Multi-Point Fuel Injection” VDI-Fortschrittsbarichte 1987
- Lenz, H.P. Fraidl, G.K. Friedl, H. “Fuel Atomization with Mixture Preparation Systems of SI-Engines” Paper presented at the XXII-FISITA-Congress September 1988 Detroit, USA