Browse Publications Technical Papers 2019-01-1155
2019-04-02

Investigation on Premixed Charge Compression Ignition Combustion Control Using Multi Pulse Ultrahigh Pressure Injection 2019-01-1155

Compression ignition (CI) engines provide higher thermal efficiency compared to other internal combustion engines although large amounts of NOx and soot are produced during combustion. NOx and soot emissions can be reduced by using Premixed Charge Compression Ignition (PCCI) combustion. However, the problems of PCCI combustion include limited operating range, unstable start of combustion and an increase in combustion noise. The multi-pulse ultrahigh pressure injection allows fuel to be injected near TDC, improving mixture formation and enhancing the possibility to extend the operating range of PCCI combustion. The objective of this paper is to control and extend the operating range of PCCI combustion using multi-pulse ultrahigh pressure injection. This has not been studied before. Combustion characteristics were investigated using apparent rate of heat release analysis, heat balance analysis, exhaust emission measurement and soot concentration measurement. The experiments were carried out on a single cylinder engine at 0.7MPa gross IMEP at 2,000 rpm. The injection pressures were varied at 200, 250, 300 and 350MPa to investigate the effects of injection pressure and shortened fuel injection timing. The injection pulses were varied at 2 pilot injections followed by 2, 3 and 4 pulses of the main injection. The main injection timings were varied from -14 to 4.5 TDC to compensate for combustion duration which was prolonged by the multi-pulse injection. The results showed that increasing main injection pulse resulted in increased thermal efficiency and smoke. It also resulted in decreased NOx. In the case of 2 pulses main injection, the heat release rate at 1st pulse is PCCI. For 3 and 4 pulses main injection, 1st, 2nd pulse are PCCI followed by diffusive combustion. Increasing injection pressure resulted in decreased NOx and smoke. A combination of increasing injection pressure combined with injection pulse resulted in increased thermal efficiency, while simultaneously decreasing NOx and smoke.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Effects of Mixedness and Ignition Timings on PCCI Combustion with a Dual Fuel Operation

2011-01-1768

View Details

TECHNICAL PAPER

Water Addition to Gasoline-Effect on Combustion, Emissions, Performance, and Knock

820314

View Details

TECHNICAL PAPER

LPG - Gasoline Bi-Fuel Engine Development for Compliance to BS-III Norms

2007-26-031

View Details

X