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A Turbocharged Lean-Burn 4.3 Liter Natural Gas Engine
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English
Abstract
The need for a natural gas conversion kit for heavy-duty engines which provides equivalent gasoline performance as well as acceptable exhaust emissions has prompted the use of turbocharged lean-burn engine technology. Turbocharged lean-burn strategy allows operation which meets current heavy-duty emission requirements without the need for a catalytic converter. To insure proper fuel distribution during lean-burn operation, the system includes multi-point sequential fuel injection, fully mapped lambda control, deceleration fuel cut-off, part load cylinder deactivation, and fuel charge stratification.
This paper documents the design and development of a General Motors turbocharged, sequential fuel injected, leanburn natural gas engine based on the 4.3L truck engine. Presented as results are the schematics of the overall fuel control system, the benefit of turbocharged lean-burn operation, the basic control algorithms, power comparison between compressed natural gas (CNG) and gasoline, and heavy-duty transient exhaust emissions test data. Transient dynamometer and field durability testing results are also presented
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Citation
Giordano, D. and Petersen, P., "A Turbocharged Lean-Burn 4.3 Liter Natural Gas Engine," SAE Technical Paper 951939, 1995, https://doi.org/10.4271/951939.Also In
References
- Cole, James J. et al “Development of the Hercules GT3.7L and GTA5.6L Engines for Low Emissions using an Open Chamber Lean-Burn Combustion System,” Proceedings, The 3rd Biannual International Conference & Exhibition on Natural Gas Vehicles Goteborg, Sweden September 22-25 1992
- Snyder, Corwin “Sequential Multi-Point Injection of a Natural Gas Engine” GRI Topical Report-GETA 9204
- Bass, Edward “Final Report on 4.3L Lean Burn MPI Engine Transient Emissions Tests for GRI” September 1993
- Pozniak, Donald J. Rydzewski, John S. “A Study of In-Cylinder Air Motion in the General Motors VORTEC 4.3L, V6 Engine” SAE Paper 850510
- Heywood, John B. “Internal Combustion Engine Fundamentals” McGraw Hill Publishing Company 1988
- Mikogami, Takashi et al “Computer Analysis of Turbocharger Heat Soak Back Properties” SAE Paper 850314