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.
Citation: Saikalis, G., Byers, R., and Nogi, T., "Study on Air Assist Fuel Injector Atomization and Effects on Exhaust Emission Reduction," SAE Technical Paper 930323, 1993, https://doi.org/10.4271/930323. Download Citation
Author(s):
George Saikalis, Robert Byers, Toshiharu Nogi
Pages: 10
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Future Fuel and Emission Systems-SP-0949, SAE 1993 Transactions: Journal of Engines-V102-3
Related Topics:
Low emission vehicles (LEV) and zero emission vehicles (ZEV)
Pressure
Exhaust emissions
Research and development
Emissions
Fuel injection
Fuel economy
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