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Analysis of the HC Behavior in the Air Intake System while Vehicle is Parked
Technical Paper
2004-01-0141
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
CARB (California Air Resources Board) has required the evaporative emissions to be restricted to 1/4th of the parameter stated in the 1995 regulations. Furthermore, hydrocarbons (hereafter, HC) from the fuel system must be reduced to near 0.0 grams, according to the PZEV (Partial Zero Emission Vehicle) regulations enforced from 2003.
The wet film in intake ports and fuel leaking from the injector nozzles evaporate and diffuse while the car is parked, and consequently may cause HC to leak the air cleaner inlet. The air cleaner which prevents HC leakage from the air intake system is already in mass production. In the course of designing this product to be installed in a vehicle, the authors developed a method to estimate the amount of HC that reaches the air cleaner. Based on detailed investigation on HC distribution and the changes that occur during parking, the HC amount reaching the air cleaner was calculated by both the equation of diffusion and the equation of state.
Therefore, application of this method enabled estimation of the reduction effects of HC diffusion gained by improving the air intake system in the stage of experimental production.
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Citation
Itakura, H., Kato, T., Kato, N., and Nishimoto, T., "Analysis of the HC Behavior in the Air Intake System while Vehicle is Parked," SAE Technical Paper 2004-01-0141, 2004, https://doi.org/10.4271/2004-01-0141.Also In
References
- Haskew Harold M. Cadman William R. “Evaporative Emissions Under Real Time Conditions” SAE Paper No. 891121 1989
- Haskew Harold M. Cadman William R. Liberty Thomas F. “The Development of a Real-Time Evaporative Emission Test” SAE Paper No. 901110 1990
- Haskew Harold M. Cadman William R. Liberty Thomas F. “Real-Time Non-Fuel Background Emissions” SAE Paper No. 912373 1991
- Urbanic J. E. Oswald E. S. Wagner N. J. Moore H. E. “Factors Affecting the Design and Breakthrough Performance of Evaporative Loss Control Systems for Current and Future Emissions Standards” SAE Paper No. 890621 1989
- Johnson H. R. Williams R. S. “Performance of Activated Carbon in Evaporative Loss Control Systems” SAE Paper No. 902119 1990
- Grisanti Ames A. Aulich Ted R. Knudson Curtis L. “Gasoline Evaporative Emissions - Ethanol Effects on Vapor Control Canister Solvent Performance” SAE Paper No. 952748 1995
- Payne Michael E. Segal Jack S. Newkirk Matthew S. Smith Lawrence R. “Use of Butane as an Alternative Fuel Emissions from a Conversion Vehicle Using Various Blends” SAE Paper No. 952496 1995
- Johnson Philip J. Jamrog James R. Lavoie George A. “Activated Carbon Canister Performance During Diurnal Cycles: An Experimental and Modeling Evaluation” SAE Paper No. 971651 1997
- Johnson Philip J. Khami Roger J. Bauman Jeffrey E. Goebel Thomas D. Clark Vernon L. Hirt David L. Luft Paul J. “Carbon Canister Development for Enhanced Evaporative Emissions and On-Board Refueling” SAE Paper No. 970312 1997
- Lockhart Marek C. “Predicting Tank Vapor Mass for On-Board Refueling Vapor Recovery” SAE Paper No. 970308 1997
- Lavoie George A. Johnson Philip J. Hood Jeffrey F. “Carbon Canister Modeling for Evaporative Emissions: Adsorption and Thermal Effects” SAE Paper No. 961210 1996
- Maeda Kunitaka Oda Kouichi Honda Minoru “Development of a Hydrocarbon Adsorption Filter” SAE Paper No. 2003-01-0565 2003
- Itakura Hideaki Kato Naoya Kohama Tokio Hyodo Yoshihiko Murai Toshimi “Studies on Carbon Canisters to Satisfy LEVII EVAP Regulations” SAE Paper No. 2000-01-0895 2003