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Effect of EGR on NOx and Thermal Efficiency Improvement in a D.I. Methanol Engine for Light Duty Vehicles
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Abstract
Exhaust gas recirculation (EGR) was applied in a spark-assisted, direct-injection (Dl) neat methanol engine for light duty vehicles. An experimental study has been carried out to analyse for major factors of EGR that influence in the reduction of NOx mass emission and improvement in brake thermal efficiency.
EGR on the Dl methanol engine alters intake charge, especially increasing the concentrations of H2O and unburned methanol with rising intake charge temperature. The results of qualitative analyses show that this phenomenon suppresses rapid heat generation at the initial combustion stage, therefore lowering the combustion temperature in the cylinders and leading to a reduction in NOx production. It was also found out that brake thermal efficiency is improved by raising in the intake charge temperature with recirculating the unburned methanol to the cylinder, which not changes start of combustion and accelerates combustion in the following combustion stages with less change in the combustion duration.
Combining the EGR rate control, fuel injection timing control, spark timing control and an oxidation catalyst, the Dl methanol engine will satisfy the 1994 Japanese Vehicle Emission Standards for trucks and buses.
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Sato, Y., Noda, A., and Sakamoto, T., "Effect of EGR on NOx and Thermal Efficiency Improvement in a D.I. Methanol Engine for Light Duty Vehicles," SAE Technical Paper 930758, 1993, https://doi.org/10.4271/930758.Also In
References
- Sato Y. Noda A. Sakamoto T. Yamamoto T. “Exhaust Emissions and Fuel Consumption Characteristics in Spark-Assisted Methanol Diesel Engine” 9th International Symposium on Alcohol Fuels 1991
- Hilger U. Jain G. Scheid E. Pischinger F. et al “Development of a Direct Injected Neat Methanol Engine For Passenger Car Applications” SAE Paper 901521
- Kapus P. Zelenka P. “Development and Dynamic Optimization of Glow Plug Assisted DI/TC Methanol Engine for Passenger Cars and Light Duty Vehicles” 9 th International Symposium on Alcohol Fuels 1991
- Narusawa K. Odaka M. Koike N. Tsukamoto Y. Yoshida K. “Effect of EGR in a D.I. Diesel Engine for Heavy-Duty Vehicles” Proceeding of the 7 th Internal Combustion Engine Symposium Japan 1988
- Murayama T. Morishima Y. Tsukahara M. Miyamoto N. “Experimental Reductions of NOx, Smoke, and BSFC in a Diesel Engine Using Uniquely Produced Water (0-80%) to Fuel Emulsion” SAE Paper 780224
- Odaka M. Koike N. Tsukamoto Y. Narusawa K. Yoshida K. “Effect of EGR with a Supplemental Manifold Water Injection to Control Exhaust Emissions from Heavy-Duty Diesel Powered Vehicles” SAE Paper 910739
- Saito T. Daisho Y. Aoki Y. “Intercooling Effects of Methanol on Turbocharged Diesel Engine Performance and Exhaust Emissions” SAE Paper 841160