Browse Publications Technical Papers 930323
1993-03-01

Study on Air Assist Fuel Injector Atomization and Effects on Exhaust Emission Reduction 930323

The effect of fuel injection atomization on engine performance has been known to improve fuel economy and to reduce emissions. Hitachi America, Ltd. Research and Development along with Hitachi Research Laboratory in Japan have studied the effects and the operation of the air assist injection system which was developed and studied to help meet future Low Emission Vehicles (LEV) regulations and also Ultra Low Emission Vehicles (ULEV) regulations.
The system consisted of newly designed air assist injectors having a spray angle of 15° at 170 kPa (absolute air pressure) with 370 kPa (absolute fuel pressure). The air assist injector generates highly atomized fuel droplets by swirling the fuel clockwise and the air counterclockwise. The fuel and air flowing in opposite directions collide, thereby producing particles around 30 μm in size at 274 kPa air pressure.
These characteristics improve cold start, cold coolant conditions and fully warm engine conditions. HydroCarbons (HC) reduction of up to 40 percent were obtained with certain set engine parameters.

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 17% 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

A Premium Heavy Duty Engine Concept for 2005 and Beyond

1999-01-0831

View Details

TECHNICAL PAPER

A Before and After Study of the Change to Unleaded Gasoline-Test Results from EPA and Other Cycles

900150

View Details

TECHNICAL PAPER

Development of Vehicle Exhaust Flow Measurement Calibration Device

2004-01-1436

View Details

X