The purpose of a hybrid powertrain is to reduce fuel consumption and emissions by the regeneration of braking energy and by minimising inefficient part load operation of the engine. This must be accomplished whilst maintaining vehicle acceleration performance as expected by drivers; this currently delivered by a powerful engine, always available. Above all, the additional life cycle costs of a successful hybrid powertrain must not be significantly greater than that of the conventional engine and transmission it replaces otherwise adoption will be greatly inhibited. The majority of hybrid powertrains available commercially and under development rely on a large electrochemical battery and electric motor to provide the second means of propulsion in place of, or to supplement, the engine. The popularity of this approach is based on the availability and mature development status of batteries and electric motors. However, there are serious drawbacks in efficiency and cost, particularly when the hybrid powertrain operates most effectively in surge power mode, providing and absorbing power levels at similar levels to engine maximum output. Inefficiencies occur due to the large number of energy transformations, and battery life is limited by the number of charge and discharge cycles, an effect made worse when current levels are high. A flywheel is proposed as a superior alternative to the battery which can provide power levels as high as the engine, limited only by the capacity of the mechanical drive. High levels of energy capacity are not required as the energy stored need not exceed the kinetic energy of a vehicle travelling at moderate speed. High cost, practicality, safety and gyroscopic effects are often cited as reasons against the use of flywheels in hybrids. These are all addressed in a description of an Imperial College flywheel design that has been developed specifically for hybrid vehicle application. This flywheel has been manufactured and early test results are also reported. Even more robust, lower cost design approaches have been developed by HyKinesys and partners and these also include consideration of the CVT systems used to transmit power from flywheel to vehicle and back. The flywheel designs are better described as flycylinders, and are denoted by the name "PowerBeams" for practical commercial application. In addition to the above, the recent announcement by the FIA to allow energy storage devices to be used in Formula One in just two years time is a substantial force for change. Such systems must also be reasonably lightweight, robust and reliable. The winner in racing is then likely to challenge for supremacy on the road. Kinetic energy storage systems are amongst the potential contenders identified by the FIA.


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    Titel :

    Kinetic energy storage for vehicles


    Beteiligte:
    Pullen, K.R. (Autor:in) / Ellis, C.W.H. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2006


    Format / Umfang :

    17 Seiten, 9 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Kinetic Energy Storage for Vehicles

    Pullen, K. / Ellis, C. / Institution of Engineering and Technology | British Library Conference Proceedings | 2006


    Kinetic Energy Storage for Vehicles

    Pullen, K. / Ellis, C. / Institution of Engineering and Technology | British Library Conference Proceedings | 2006


    Kinetic energy storage in hybrid vehicles - the mechanical battery

    Sontheim,J. / Compact Dynamics,Starnberg,DE | Kraftfahrwesen | 2008



    ECOLOGICAL SYSTEM EXPLOITING KINETIC ENERGY IN VEHICLES

    ESTEFAN BELLAN ABDON MIGUEL / VARGAS MACHADO CARLOS MAURICIO / FINO PUERTO PEDRO ANTONIO | Europäisches Patentamt | 2021

    Freier Zugriff