Adoption of a KERS may permit regenerative braking, engine buffering and engine downsizing (through torque assistance) as a means of improving efficiency and hence reducing fuel consumption and CO2 emissions. Results presented for a full-size passenger car equipped with a 4 l, in-line six, throttle controlled, port fuel injected, stoichiometric gasoline engine running the NEDC are very promising. The configuration with the 4 l engine and the KERS reduces the fuel usage of 25 %, while the configuration with the 3.3 l downsized engine and the KERS reduces the fuel usage of 33 %. These benefits of a KERS follow the application of a computational tool validated with traditional or hybrid electric power trains but not with a KERS. Prototyping of the KERS and chassis dynamometer testing of the vehicle modified with the KERS is necessary to fully assess the benefits of the technique. Results obtained here are, however, in line with what is being measured by other researchers in other gasoline applications. Simulations have only been performed with one vehicle and one driving cycle. Improvements in fuel economy may vary adopting different vehicles, engines and driving cycles. The benefits of the KERS may reduce in passenger cars with smaller, turbocharged, HSDI Diesel engine, where the efficiency penalty reducing the load by quantity of fuel injected is much smaller than in large throttle-controlled gasoline engines. The end of the NEDC cycle with the stop of the vehicle from high speed and immediate engine turn off is very far from the real-life operation of a car. Real-life benefits of the KERS in city driving conditions, well represented by the ECE sectors of the NEDC, may therefore be guessed to have at least 30 % better fuel economy on almost every platform, Diesel or gasoline, naturally aspirated or turbocharged, lean burn or stoichiometric, load controlled by throttle or quantity of fuel injected. The KERS have major areas of development in power density, life, simplicity, effectiveness and first and foremost the costs of the device. Applications are being considered for small, mass-production passenger cars, as well as luxury cars, buses and trucks.


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    Titel :

    Improvements of vehicle fuel economy using mechanical regenerative braking


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2011


    Format / Umfang :

    14 Seiten, 11 Bilder, 3 Tabellen, 26 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch