The hybridization of internal combustion engine systems with electric components leads to benefits in fuel consumption and/or engine out emissions, but with the disadvantage of increased system costs. In order to justify these additional costs, this paper presents an approach that aims at simultaneously strongly reducing the systems fuel consumption and engine out soot emissions while keeping the NOx engine out emissions at the same level as for the conventional ICE (Internal Combustion Engine) application. As a consequence the DPF (Diesel Particulate Filter) can be omitted in the hybrid system configuration for Tier 4 final. Furthermore, this paper describes the utilized electrical components and the control strategy applied to transient non-cyclic operation. Simulation results regarding the fuel consumption of the different systems analyzed and verified at the engine test bench. An electric hybrid system can lead to significant fuel and soot reductions also for offroad applications without the possibility to recuperate, if the architecture and the control strategy is optimized. Also the calibration of the ICE has to be performed in correlation with the control strategy to keep the NOx emissons on the same level whereas fuel and soot can be reduced. The reduction of the soot emissions is mainly driven by the avoidance of high transient phases (ICE speed and torque). The fuel consumption benefit results from the reduced engine speed and therefore from the reduction of the ICE friction. The ISG (Integrated Starter Generator) is the enabling technology to realize such a strong down speed strategy to compensate and overcome the additional electric efficiency. The D936H-pd approach shows the best performance regarding the key values and shows also a benefit regarding the ICE hardware regarding cost. To utilize the cost potential for the D936Hpd and D936H-pc approach a dedicated calibration of the ICE is necessary. This calibration can be done to achieve the steady state test cycles and also the NTE (Not To Exceed) zone, but the calibration will not cover the NRTC (Non-Road Transient Cyclus). These because now high transient changes on the ICE are necessary. Therefore a discussion regarding the certified process of a hybrid system should be started with the public authorities to make such systems more attractive.


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    Titel :

    Electric hybrid powertrain for off-road applications - measurement results from a 6-cylinder 10.5 l off-road engine


    Weitere Titelangaben:

    Elektro-Hybrid-Antriebsstrang für Nutzfahrzeuge - Messergebnisse für einen 6-Zylinder-Nutzfahrzeugmotor mit einem Hubraum von 10,5 Litern


    Beteiligte:
    Schlager, G. (Autor:in) / Benatzky, C. (Autor:in) / Quasthoff, M. (Autor:in) / Gay, B. (Autor:in)


    Erscheinungsdatum :

    2011


    Format / Umfang :

    25 Seiten, 18 Bilder, 4 Tabellen, 3 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch






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