Abdelfattah M. Farahat

Helwan University, Al Qāhirah, Al Qāhirah, Egypt

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Publications (3)2.07 Total impact

  • Sameh M. Metwalley, Shawki A. Abouel-seoud, Abdelfattah M. Farahat
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    ABSTRACT: Vehicle emissions constitute the main source of atmospheric pollution in modern cities. The increasing number of passenger cars, especially during the last decade, resulted in composite traffic problems with serious consequences on emissions and fuel consumption. However, the present work aims to clear the effect of different operating parameters of the vehicle on their emission characteristics. The on-road emission test procedure was carried out on a newly registered gasoline/CNG bi-fuel vehicle in Egypt market (Hyundai-star) and is now assessed from the European standard driving cycle. The European driving cycle shows the characteristics of vehicles operating conditions for various speeds and acceleration ranges, but does not represent realistic speed-time history of a vehicle in actual traffic. As the driving conditions are different, the assessment results using this driving cycle may not produce realistic amounts of emissions and fuel consumption of the cars under. Emission tests were carried out for urban cycle. Two different fuel injection systems (i.e., Multi-point MPI-sequential and Closed-loop venturi-continuous) are used The vehicle is equipped with infrared gas analyzer and magnetic pickup transducer to measure the concentration of exhaust constituents and engine rotational speed respectively. The measurements were conducted at different vehicle speed. The results indicate that most of the carbon monoxide (CO), carbon dioxide (CO2) and unburned total hydrocarbons (THC) emission appears at higher load as well as near the idling speed.
    International Journal of Green Energy 01/2012; · 2.07 Impact Factor
  • Sameh M. Metwalley, Shawki A. Abouel-Seoud, Abdelfattah M. Farahat
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    ABSTRACT: Natural gas (NG) represents today a promising alternative to conventional fuels for road vehicles propulsion, since it is characterized by a relatively low cost, better geopolitical distribution than oil, and lower environmental impact. This explains the current spreading of compressed natural gas (CNG) fuelled spark ignition (SI) engine, above all in the bi-fuel version, which is able to run either with gasoline or with NG. However, the aim of the present investigation is to evaluate the emission characteristics at idling condition. The vehicle engine was converted to bifueling system from a gasoline engine, and operated separately either with gasoline or CNG. Two different fuel injection systems (i.e., multi-point injection (MPI)-sequential and closed-loop venturi-continuous) are used, and their influences on the formation of emissions at different operating conditions are examined. A detailed comparative analysis of the engine exhaust emissions using gasoline and CNG is made. The results indicate that the CNG shows low air index and lower emissions of carbon monoxide (CO), carbon dioxide (CO2), and total hydrocarbon (THC) compared to gasoline. Keywordsroad vehicle engine–fuel injection systems–carbon monoxide (CO)–carbon dioxide (CO2)–total hydrocarbon (THC)–vehicle idle conditions–air index
    01/2011; 5(3):322-329.
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    Sameh M Metwalley, Shawki A Abouel-Seoud, Abdelfattah M Farahat
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    ABSTRACT: The reduction of pollutant emission from spark ignition engines is desirable in order to reduce the highly impact on the green environment, produced from transport release like trains, trucks, traveler vehicles and others. However, modern vehicles are equipped with catalytic converters. A bi-fuel vehicle that has been retrofitted for both fuel systems: namely, compressed natural gas (CNG) and base fuel gasoline. A locally produced three-way catalytic converter (TWC) fitted on the exhaust system. The objective of this investigation is to evaluate the effectiveness of TWC in reducing vehicle exhaust emissions. In addition, the individual conversion efficiency of the vehicle-out emissions have been calculated and presented. Operations under idle state and on-road emission test procedures were carried out on a newly registered gasoline/CNG bi-fuel vehicle in Egypt market (Hyundai-star) where is assessed against the European standard urban driving cycle (ECE-15). Two different fuel injection systems are used; namely multi-point (MPI) and venture (mixer) closed-loop. The emission results such as CO, CO 2 and THC were measured and compared between the earlier mentioned two fuels. The results show that the arrangement of TWC and operation in idle state is very effective to reduce exhaust emissions than that in transient state. Moreover, the results of this investigation will be used to develop CNG emissions based TWC.