25-09-2013, 12:54 PM
High-Efficiency, Ultra-Low Emission Combustion in a Heavy-Duty Engine via Fuel Reactivity Control
High-Efficiency, Ultra-Low .pdf (Size: 3.03 MB / Downloads: 165)
Fuel reactivity control: Dual-fuel PCCI
• Bessonette (SAE 2007-01-0191) extended HCCI load range by varying fuel
composition
–16 bar BMEP required 27 cetane fuel: gasoline-like
–3 bar BMEP required 45 cetane fuel: diesel-like
• Optimized operation requires different fuel reactivity for different
operating conditions: Dual-fuel
– Port fuel injection of gasoline
– Direct injection of diesel fuel
Conclusions
• PPC “Mixed enough” Gasoline
- No traditional PM/NOx tradeoff
- Approach 2010 EPA HD on-highway truck emission standards
in-cylinder at 11 and 6 bar net IMEP
- Low ISFC and pressure rise rate
• Dual-fuel PCCI concept used to control fuel reactivity
- Port fuel injection of gasoline (cost effective)
- Direct injection of diesel fuel (moderate injection pressure)
- Possibility of traditional diesel or SI (with spark plug)
operation retained for full load operation
• Dual-fuel operation at 6, 9, and 11 bar net IMEP achieved with
near zero NOx and soot and reasonable Pressure Rise Rate
• 53% indicated thermal efficiency achieved
while easily meeting US 2010 EPA standards in-cylinder