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HyFlex-ICE: Highly Flexible Internal Combustion Engines for Hybrid Vehicles

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23. Internationales Stuttgarter Symposium (ISSYM 2023)

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Abstract

In the development of future passenger cars, the statutory regulations on decarbonization of the exhaust emissions must be reconciled with customer requirements. Therefore, it is necessary to con-sider the complex interactions within powertrain systems at the earliest possible stage of development, to exploit their full potential. Thus, this paper presents a holistic methodology for optimizing the operation of all powertrain components exemplified by a hybrid powertrain. The methodology enables the full potential of all powertrain components to be exploited. For this purpose, a requirements catalog focused on the powertrain was derived using a top-down systems engineering approach. This requirements catalog is necessary for the identification of all limiting factors of the powertrain system. The development and application of the methodology and the system optimization were carried out via extensive simulation studies. Thereby, an optimal design of the hybrid powertrain was derived for a defined target application. Based on this, the system limitations were identified in Real-World Driving Scenarios, considering all relevant requirements. These limitations were significantly minimized and optimized by predictive control strategies, sophisticated hardware adaptations and innovative technologies. Finally, the scalability and transferability of this holistic approach is demonstrated by developing and optimizing a P2-Hybrid powertrain for the same requirements.

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Notes

  1. 1.

    Sys: Sys: System Driving Performance | El: Electric Driving Performance | HL: Half Load Mass | FL: Full Load Mass.

  2. 2.

    Corrected CO2 emissions are calculated with reference to the initial SOC (SOCinit = 16.8%) only for charge sustaining mode. No correction is considered for charge depleting mode.

    (SOCinit = 50%).

  3. 3.

    Corrected CO2 emissions are calculated with reference to the SOCend of the base simulation (24.6%).

  4. 4.

    A pre-heating duration of 30 seconds is considered for the E-Catalyst and Latent Heat Storage System.

  5. 5.

    Corrected CO2 emissions are calculated with reference to the SOCend of the base simulation (24.6%).

  6. 6.

    Corrected CO2 emissions are calculated with reference to SOCinit (Low-cost & HyFlex package: 16.8% / Advanced package: 23.1% due to battery reserve of 1 kWh).

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Acknowledgement

This report is the scientific result of a research project undertaken by the FVV eV and performed by the Chair of Thermodynamics of Mobile Energy Conversion Systems (tme) at RWTH Aachen University under the direction of Univ.-Prof. Dr.-Ing. (USA) Stefan Pischinger.

The authors would like to acknowledge the self-financed funding received from the FVV no. 1433 “Highly-flexible internal combustion engines for hybrid vehicles” (HyFlex-ICE).

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Authors and Affiliations

  1. Chair of Thermodynamics of Mobile Energy Conversion Systems (tme), RWTH Aachen University, 52074, Aachen, Germany

    Jannik Kexel, Jonas Müller, Marco Günther & Stefan Pischinger

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  1. Jannik Kexel
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  2. Jonas Müller
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  3. Marco Günther
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  4. Stefan Pischinger
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Corresponding author

Correspondence to Jannik Kexel .

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Editors and Affiliations

  1. Forschungsinstitut für Kraftfahrwesen, Stuttgart, Deutschland

    André Casal Kulzer

  2. Fahrzeugmotoren Stuttgart, Forschungsinstitut für Kraftfahrwesen, Stuttgart, Baden-Württemberg, Deutschland

    Hans-Christian Reuss

  3. FKFS/IVK, Forschungsinstitut für Kraftfahrwesen, Stuttgart, Baden-Württemberg, Deutschland

    Andreas Wagner

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Kexel, J., Müller, J., Günther, M., Pischinger, S. (2023). HyFlex-ICE: Highly Flexible Internal Combustion Engines for Hybrid Vehicles. In: Kulzer, A.C., Reuss, HC., Wagner, A. (eds) 23. Internationales Stuttgarter Symposium. ISSYM 2023. Proceedings. Springer Vieweg, Wiesbaden. https://doi.org/10.1007/978-3-658-42048-2_18

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