Browse Publications Technical Papers 2007-01-1895
2007-07-23

Advanced hybrid electronic unit injector with accumulator for enhanced multiple injection and ultra high injection pressure capability 2007-01-1895

In order to meet new worldwide emission regulations for heavy-duty diesel engines and to provide high specific power output without fuel consumption penalties there is a requirement for the fuel injection system to have a flexible choice of injection characteristics. Such a fuel injection system has to provide multiple injections, modulated injection pressures and rates for every injection, and possibly variable spray cone angle to accommodate early injection without wall wetting whilst maintaining conventional injection for rated power.
The aim of this paper is to present the advanced hybrid electronic unit injector system (EUI). This system incorporates an accumulator rail, which enables high pressure multiple injection events at different injection pressures for a very wide range of injection timings that would not normally be achievable using a conventional EUI system and single lobe EUI camshaft. It also has the ability to do boot shape injections starting from a constant rail pressure which merges into a rapidly rising pressure mid injection.
The experimental work was performed on a single cylinder heavy-duty research engine at key operating modes. The results show that engine emissions can be reduced whilst specific fuel consumption is improved. The results obtained show potentials in controlling injection rate, shape and timing compared to a conventional EUI system.

SAE MOBILUS

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

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% 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

Closed Loop Combustion Control - Enabler of Future Refined Engine Performance Regarding Power, Efficiency, Emissions & NVH under Stringent Governmental Regulations

2011-24-0171

View Details

TECHNICAL PAPER

Thermodynamic Potentials of a Fully Variable Valve Actuation System for Passenger-Car Diesel Engines

2010-01-1199

View Details

TECHNICAL PAPER

Model Based Control for Dual EGR System with Intake Throttlein New Generation 1.6L Diesel Engine

2013-24-0133

View Details

X