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Strategies to Reduce HC-Emissions During the Cold Starting of a Port Fuel Injected Gasoline Engine
Technical Paper
2003-01-0627
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In view of tight emission standards, injection strategies to reduce raw HC-emissions during the cold starting of port fuel injected engines are evaluated in this study. The relevance of spray targeting and atomization is outlined in the first part of this paper. The foundation and performance of different injector concepts with respect to spray characteristics are discussed. Laboratory experiments demonstrate that concepts relying on auxiliary energy, such as air-assistance, fuel heating and injection at elevated system pressures, are capable of producing spray droplet sizes in the SMD-range of 25μm. For future injection strategies aimed at the compliance of SULEV emission levels, this target value is considered to be essential.
In the second part of this paper, emission tests of selected injector concepts are carried out using a V6-3.2I ULEV engine operated both in a vehicle and on a test bench. In this context, the relevance of an optimized start calibration as well as defining engine operating boundary conditions is discussed. Improving the fuel flow inside current injector designs already yields a 20-30% reduction of raw HC-emissions during cold starting. Significant reductions in the range of 40-50% are achieved by means of heated-tip injectors and fuel injection at elevated system pressures. Additionally, an FTP75 test series for selected concepts is presented.
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Samenfink, W., Albrodt, H., Frank, M., Gesk, M. et al., "Strategies to Reduce HC-Emissions During the Cold Starting of a Port Fuel Injected Gasoline Engine," SAE Technical Paper 2003-01-0627, 2003, https://doi.org/10.4271/2003-01-0627.Also In
References
- Brünemann R. Holder E. Kemmler R. Koehlen C. Matt M. “Influence of Highly Volatile Startfuel on the Exhaust Emissions of Spark Ignition Engines for Passenger Cars” 4 th Stuttgart International Symposium 2001
- Samenfink W. Schlerfer J. Joos K. Weining H.K. Holder E. Beel B. “Emission Reduction below the ULEV-Level for a DC-Test Engine, Effect of Optimized Condition at Engine Start and Right after Start” Aachener Kolloquium Fahrzeug und Motorentechnik 1999
- Heyse J. Schatz F. Ader B. Schlerfer J. Haubold S. “Electroformed Multilayer Orifice Plate for Improved Fuel Injection Characteristics” SAE paper 971070 1997
- Tani Y. Mori Y. Mochizuki K. “Multiple-hole Nozzle Atomization for Spark Ignition Engines” SAE paper 1999-01-0564 1999
- Saikalis G. Byers R. Toshiharu N. “Study on Air Assist Fuel Injector Atomization and Effects on Exhaust Emission Reduction” SAE paper 930323 1993
- Maier G. Wittig S. Manz P.-W. “Influence of Air Assisted Fuel Injection on the Mixing Preparation within the Intake Ports of SI-Engines” SAE paper 982523 1998
- Zimmermann F. Bright J. Ren W.-M. Imoehl B. “An Internally Heated Tip Injector to Reduce HC Emissions During Cold-Start” SAE paper 1999-01-0792 1999