MSA coasting is the most efficient method for reducing the vehicles velocity for all considered deceleration maneuvers as far as the required distance is available. Since this mode is not available in today's series vehicles (excepted from some hybrid vehicles) the other results are used to evaluate the possible deceleration modes. The stronger a deceleration, the longer the displacement (section with constant velocity) and the higher the resulting fuel consumption. Therefore a key message is that a smaller deceleration mostly is more efficient than a stronger one. If brake energy regeneration is applied to recover parts of the vehicles kinetic energy it is more efficient to minimize the regeneration power and instead using the kinetic energy to overcome the driving resistances, if the necessary distance is available. Without this distance it is obviously better to maximize the regeneration power to avoid applying the friction brake and converting kinetic energy just into lost heat. Furthermore the results for shear RT show, that reducing the drag torque of the ICE leads to a sizeable improvement in efficiency compared to "conventional" shear mode. As the deceleration in shear RT takes a longer time, a high amount of kinetic energy can be recovered with comparable low regeneration power. In addition a shorter displacement has to be covered with initial speed. Predictive driving strategies with light deceleration intensities (coasting) are more efficient than deceleration with brake energy regeneration, especially for higher velocities. Decelerations with BER partially become more efficient for small starting (vstart < 60 km/h) and small target velocities (vtarget < 20 km/h) than idle coasting. The reasons are the increasing duration and the continually idle consumption for idle coasting at small velocities compared to the other modes. Here the influence of the on-board network power load comes into effect. Idle consumption increases with higher on-board network load due to higher generator load (load point increase). Here the deceleration modes with BER reach better efficiencies for higher velocities too. According to that an adaptive deceleration strategy depending on the on-board network load is supposable. An additional load in the belt drive (e.g. air conditioning) is supposed to be treatable identically to the electric generators load. In summary it can be said, that predictive information for upcoming route sections enables predictive deceleration strategies to reduce fuel consumption in a sizeable magnitude. Depending on velocity differences and available deceleration modes fuel reductions amounting to several milliliters for each deceleration maneuver are possible. Potential for subsequent research are influencing factors on the deceleration maneuvers. These are road gradients or the current SOC of the battery. The latter is of particular importance as it defines if BER or MSA is possible at all. Over and above the drivers intention and sensation play decisive roles. This was not taken into account in this survey. A long time deceleration maneuver (e.g. coasting down to small velocities) is supposed to be uncomfortable. A solution could be the combination of different deceleration modes to maximize efficiency and comfort for the driver.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Approach to energetic evaluation of different deceleration methods by the use of predictive information


    Beteiligte:


    Erscheinungsdatum :

    2011


    Format / Umfang :

    13 Seiten, 7 Bilder, 2 Tabellen, 13 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    DECELERATION INFORMATION TRANSMISSION DEVICE AND DECELERATION INFORMATION TRANSMISSION METHOD

    KANEHARA SHUNICHI / SHIONOME KOJI | Europäisches Patentamt | 2020

    Freier Zugriff

    Deceleration information notification device and deceleration information notification method

    KANEHARA SHUNICHI / SHIONOME KOJI | Europäisches Patentamt | 2016

    Freier Zugriff

    Rapid deceleration mode evaluation

    Conners, Timothy R. / Nobbs, Steven G. / Orme, John S. | NTRS | 1995


    Rapid Deceleration Mode Evaluation

    T. R. Conners / S. G. Nobbs / J. S. Orme | NTIS | 1995


    Deceleration setting system, deceleration setting method, and deceleration setting program

    NIWA TOSHIAKI / KODAN TOMOKI / TANAKA KUNIAKI | Europäisches Patentamt | 2016

    Freier Zugriff