For a hybrid electric vehicle (HEV) with an internal combustion engine, simply operating the engine in its regions of high efficiency does not guarantee the most fuel efficient operational strategy. This paper defines an operational strategy for a HEV through calculating individual powertrain component losses and comparing those losses across possible operational modes. This paper presents a motor torque control strategy for a SPA (Split Parallel Architecture) HEV through calculating powertrain component losses. The literature review gives a background of hybrid vehicle control publications, while this paper focuses on the SPA HEV and analysis based on loss calculations between engine only and hybrid modes. The REVLSE (Renewable Energy Verhicle, the Larsen Special Edition) architecture and components are presented because this analysis is tied directly to the efficiencies of the engine, motors, and battery used. Next, the SPA hybrid modes are explained. It is noted that this analysis is based on static operating conditions, and transient or dynamic considerations have not been made. Other assumptions for the calculation model include normal operating conditions for the vehicle powertrain components and that driveline losses are not included. Then the losses for each hybrid mode are calculated, and both the conversion efficiency and assist ratio are detailed. The conversion efficiency represents the amount of additional fuel required to store a certain amount of energy in the battery, and this marginal efficiency can be higher than peak engine efficiency itself. Thus, this conversion efficiency correctly accounts for only the fuel used by the engine to generate stored energy, and not just the engine efficiency based on total load while propelling the vehicle. For the SPA HEV, using the RTM (Rear Traction Motor) for a generator is not considered due to the additional losses of the through-the- road generate path, and the potential for driveability issues. The calculation of an average conversion efficiency allows electric only propulsion to be evaluated against the engine, and at low torques the electric motor is more efficient despite the roundtrip losses of the hybrid system and energy storage. Regenerative braking can contribute a significant amount of energy to the battery, thus offsetting fuel that would have been used to store energy in the battery otherwise.


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    Title :

    Hybrid electric vehicle control strategy based on power loss calculations


    Additional title:

    Regelungsstrategie von Hybridfahrzeugen auf der Basis von Leistungsverlustberechnungen


    Contributors:


    Publication date :

    2008


    Size :

    15 Seiten, 23 Bilder, 4 Tabellen, 10 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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