@inproceedings{LeitnerLagrangeEndisch2016, author = {Leitner, Lukas and Lagrange, Antoine and Endisch, Christian}, title = {End-of-line fault detection for combustion engines using one-class classification}, booktitle = {2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5090-2065-2}, doi = {https://doi.org/10.1109/AIM.2016.7576768}, pages = {207 -- 213}, year = {2016}, language = {en} } @inproceedings{LeitnerEndisch2018, author = {Leitner, Lukas and Endisch, Christian}, title = {Skewed and Heavy-Tailed Hidden Random Walk Models with Applications in Automated Production Testing}, booktitle = {2018 IEEE 22nd International Conference on Intelligent Engineering Systems (INES)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5386-1122-7}, doi = {https://doi.org/10.1109/INES.2018.8523927}, pages = {000281 -- 000286}, year = {2018}, language = {en} } @inproceedings{ZiegmannSchmidEndisch2018, author = {Ziegmann, Johannes and Schmid, Michael and Endisch, Christian}, title = {Sensitivity Analysis for Driver Energy Prediction with Environmental Features and Naturalistic Data}, booktitle = {2018 IEEE International Conference on Intelligent Engineering Systems (INES)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5386-1122-7}, doi = {https://doi.org/10.1109/INES.2018.8523987}, pages = {000199 -- 000206}, year = {2018}, language = {en} } @inproceedings{HerrmannGerngrossEndisch2018, author = {Herrmann, Patrick and Gerngroß, Martin and Endisch, Christian}, title = {Numerical Optimization in Planning of Flexible Needle Winding Trajectories}, booktitle = {2018 IEEE International Conference on Intelligent Engineering Systems (INES)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5386-1122-7}, doi = {https://doi.org/10.1109/INES.2018.8523924}, pages = {000255 -- 000260}, year = {2018}, language = {en} } @inproceedings{AltmannshoferEndischTrieu2017, author = {Altmannshofer, Simon and Endisch, Christian and Trieu, Khanh Duy}, title = {On-line identification and identifiability analysis of electrical and mechanical parameters of induction machines}, booktitle = {2017 IEEE International Conference on Advanced Intelligent Mechatronics (AIM)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5090-6000-9}, issn = {2159-6255}, doi = {https://doi.org/10.1109/AIM.2017.8014079}, pages = {577 -- 583}, year = {2017}, language = {en} } @inproceedings{MuellerEndisch2017, author = {M{\"u}ller, Tino and Endisch, Christian}, title = {An estimation based iterative learning control approach for cross-coupled vehicle test systems}, booktitle = {2017 IEEE International Conference on Advanced Intelligent Mechatronics (AIM)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5090-6000-9}, issn = {2159-6255}, doi = {https://doi.org/10.1109/AIM.2017.8014210}, pages = {1375 -- 1381}, year = {2017}, language = {en} } @inproceedings{ZiegmannShiSchnoereretal.2017, author = {Ziegmann, Johannes and Shi, Jieqing and Schn{\"o}rer, Tobias and Endisch, Christian}, title = {Analysis of individual driver velocity prediction using data-driven driver models with environmental features}, booktitle = {2017 IEEE Intelligent Vehicles Symposium}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5090-4804-5}, doi = {https://doi.org/10.1109/IVS.2017.7995770}, pages = {517 -- 522}, year = {2017}, language = {en} } @inproceedings{VoegeleZiegmannEndisch2017, author = {V{\"o}gele, Ulrich and Ziegmann, Johannes and Endisch, Christian}, title = {Driver adaptive predictive velocity control}, booktitle = {2017 IEEE 20th International Conference on Intelligent Transportation Systems (ITSC)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5386-1526-3}, issn = {2153-0017}, doi = {https://doi.org/10.1109/ITSC.2017.8317668}, year = {2017}, language = {en} } @inproceedings{HerrmannGerngrossEndischetal.2017, author = {Herrmann, Patrick and Gerngroß, Martin and Endisch, Christian and Stenzel, Peer and Uhlmann, Philipp}, title = {Automated contacting technology for needle winding applications with distributed windings}, booktitle = {2017 7th International Electric Drives Production Conference (EDPC) Proceedings}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5386-1069-5}, doi = {https://doi.org/10.1109/EDPC.2017.8328169}, year = {2017}, language = {en} } @inproceedings{HerrmannGerngrossEndisch2018, author = {Herrmann, Patrick and Gerngroß, Martin and Endisch, Christian}, title = {NURBS based trajectory generation for an industrial five axis needle winding robot}, booktitle = {Conference Proceedings of 2018 4th International Conference on Control, Automation and Robotics (ICCAR)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5386-6338-7}, doi = {https://doi.org/10.1109/ICCAR.2018.8384640}, pages = {31 -- 36}, year = {2018}, language = {en} } @inproceedings{LeitnerEndisch2018, author = {Leitner, Lukas and Endisch, Christian}, title = {Robust stochastic process models and parameter estimation for industrial end-of-line-testing}, booktitle = {Proceedings: 2018 IEEE International Conference on Industrial Technology (ICIT)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5090-5949-2}, doi = {https://doi.org/10.1109/ICIT.2018.8352406}, pages = {1520 -- 1525}, year = {2018}, language = {en} } @inproceedings{LiebhartDiehlSchneideretal.2021, author = {Liebhart, Bernhard and Diehl, Simon and Schneider, Dominik and Endisch, Christian and Kennel, Ralph}, title = {Enhancing the Cell Impedance Estimation of a Lithium-Ion Battery System with Embedded Power Path Switches}, booktitle = {APEC 2021: Thirty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-7281-8949-9}, issn = {2470-6647}, doi = {https://doi.org/10.1109/APEC42165.2021.9487173}, pages = {967 -- 974}, year = {2021}, language = {en} } @inproceedings{KleinerHeiderKomsiyskaetal.2021, author = {Kleiner, Jan and Heider, Alexander and Komsiyska, Lidiya and Elger, Gordon and Endisch, Christian}, title = {Experimental Study on the Thermal Interactions in Novel Intelligent Lithium-Ion Modules for Electric Vehicles}, booktitle = {Proceedings of the Twentieth InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems: ITherm 2021}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-7281-8539-2}, issn = {2694-2135}, doi = {https://doi.org/10.1109/ITherm51669.2021.9503299}, pages = {556 -- 562}, year = {2021}, language = {en} } @inproceedings{LiebhartDiehlSchmidetal.2021, author = {Liebhart, Bernhard and Diehl, Simon and Schmid, Michael and Endisch, Christian and Kennel, Ralph}, title = {Improved Impedance Measurements for Electric Vehicles with Reconfigurable Battery Systems}, booktitle = {Proceedings of the Energy Conversion Congress and Exposition - Asia, 2021 (ECCE Asia 2021)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-7281-6344-4}, issn = {2150-6086}, doi = {https://doi.org/10.1109/ECCE-Asia49820.2021.9479060}, pages = {1736 -- 1742}, year = {2021}, language = {en} } @inproceedings{HerrmannGerngrossEndisch2019, author = {Herrmann, Patrick and Gerngroß, Martin and Endisch, Christian}, title = {Benefits of numerical optimization and CAD/CAM in needle winding processes}, booktitle = {Proceedings, 2019 IEEE International Conference on Mechatronics (ICM)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5386-6959-4}, doi = {https://doi.org/10.1109/ICMECH.2019.8722940}, pages = {301 -- 307}, year = {2019}, language = {en} } @inproceedings{OkonEndisch2019, author = {Okon, Michael and Endisch, Christian}, title = {On air-gap approximations for slotted electrical machine models assuming radial magnetic fields}, booktitle = {Proceedings, 2019 IEEE International Conference on Industrial Technology (ICIT)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5386-6376-9}, doi = {https://doi.org/10.1109/ICIT.2019.8755196}, pages = {292 -- 297}, year = {2019}, language = {en} } @inproceedings{GerngrossHerrmannEndisch2019, author = {Gerngroß, Martin and Herrmann, Patrick and Endisch, Christian}, title = {Nonlinear modelling of dynamic wire tension for needle winding processes of distributed windings}, booktitle = {Proceedings, 2019 IEEE International Conference on Industrial Technology (ICIT)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5386-6376-9}, doi = {https://doi.org/10.1109/ICIT.2019.8755052}, pages = {151 -- 156}, year = {2019}, language = {en} } @inproceedings{KohlerGerngrossEndisch2022, author = {Kohler, Markus and Gerngroß, Martin and Endisch, Christian}, title = {A Test Bench Concept and Method for Image-Based Modeling of Geometric Wire Bending Behavior in Needle Winding Processes}, booktitle = {2022 IEEE 31st International Symposium on Industrial Electronics (ISIE)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-6654-8240-0}, issn = {2163-5145}, doi = {https://doi.org/10.1109/ISIE51582.2022.9831494}, pages = {1113 -- 1120}, year = {2022}, language = {en} } @inproceedings{NachtsheimKorkmazSchmoelzetal.2022, author = {Nachtsheim, Martin and Korkmaz, Luetfue and Schmoelz, Martin and Endisch, Christian}, title = {Observability Analysis for Parameter Identification of Induction Machines in Automotive Environment}, booktitle = {2022 IEEE 31st International Symposium on Industrial Electronics (ISIE)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-6654-8240-0}, issn = {2163-5145}, doi = {https://doi.org/10.1109/ISIE51582.2022.9831658}, pages = {206 -- 213}, year = {2022}, language = {en} } @article{StoettnerRauscherEndisch2022, author = {St{\"o}ttner, Julia and Rauscher, Andreas and Endisch, Christian}, title = {Pareto optimization of multilevel inverter structures regarding the DC magnitude, switching frequency and switching angles}, volume = {2022}, pages = {108259}, journal = {International Journal of Electrical Power \& Energy Systems}, number = {142, Part A}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0142-0615}, doi = {https://doi.org/10.1016/j.ijepes.2022.108259}, year = {2022}, language = {en} } @article{TerbrackStoettnerEndisch2022, author = {Terbrack, Christoph and St{\"o}ttner, Julia and Endisch, Christian}, title = {Design and Validation of the Parallel Enhanced Commutation Integrated Nested Multilevel Inverter Topology}, volume = {37}, journal = {IEEE Transactions on Power Electronics}, number = {12}, publisher = {IEEE}, address = {Piscataway}, issn = {1941-0107}, doi = {https://doi.org/10.1109/TPEL.2022.3183859}, pages = {15163 -- 15174}, year = {2022}, language = {en} } @article{RauscherHufnagelEndisch2022, author = {Rauscher, Andreas and Hufnagel, Manuel and Endisch, Christian}, title = {Pareto optimization of wavelet filter design for partial discharge detection in electrical machines}, volume = {2022}, pages = {112163}, journal = {Measurement}, number = {205}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1873-412X}, doi = {https://doi.org/10.1016/j.measurement.2022.112163}, year = {2022}, abstract = {A reliable detection of partial discharges (PDs) in the insulation system of electrical machines is essential to prevent premature breakdowns. Wavelet filters (WFs) are often recommended for denoising this PD measurement data. However, filtering performance strongly depends on numerous settings, which impedes an optimum filter choice. We propose an approach to systematically select the best filter for denoising PD signals. First, representative PD pulses are determined from measurement data by an averaging and a singular value decomposition method. Next, realistic benchmark signals are generated for filter assessment. Further, all possible WF combinations from a set of different mother wavelet selection methods, decomposition trees, and thresholding approaches are evaluated. On the basis of two contradicting objectives, namely mean square error of noise intervals and pulse amplitude distortion, Pareto optimization is applied to choose optimal WF settings. The corresponding filters dominate several common WF proposals from previous literature.}, language = {en} } @article{KleinerLambauerSinghetal.2022, author = {Kleiner, Jan and Lambauer, Florian and Singh, Randeep and Komsiyska, Lidiya and Hinterberger, Michael and Endisch, Christian}, title = {Experimental study of cell integrated heat pipe cooling with a lithium-ion cell emulator}, volume = {2022}, pages = {105808}, journal = {Journal of Energy Storage}, number = {56, Part A}, publisher = {Elsevier}, address = {Amsterdam}, issn = {2352-1538}, doi = {https://doi.org/10.1016/j.est.2022.105808}, year = {2022}, language = {en} } @inproceedings{SchmidLiebhartKleineretal.2021, author = {Schmid, Michael and Liebhart, Bernhard and Kleiner, Jan and Endisch, Christian and Kennel, Ralph}, title = {Online Detection of Soft Internal Short Circuits in Lithium-Ion Battery Packs by Data-Driven Cell Voltage Monitoring}, booktitle = {Proceedings of the Energy Conversion Congress \& Exposition - Asia, 2021 (ECCE-Asia 2021)}, publisher = {IEEE}, address = {Piscataway (NJ)}, isbn = {978-1-7281-6344-4}, issn = {2150-6086}, doi = {https://doi.org/10.1109/ECCE-Asia49820.2021.9479175}, pages = {1711 -- 1718}, year = {2021}, language = {en} } @article{MoralesTorricosEndischLewerenz2023, author = {Morales Torricos, Pablo and Endisch, Christian and Lewerenz, Meinert}, title = {Apparent Aging during Accelerated Cycling Aging Test of Cylindrical Silicon Containing Li-Ion Cells}, volume = {9}, pages = {230}, journal = {Batteries}, number = {4}, publisher = {MDPI}, address = {Basel}, issn = {2313-0105}, doi = {https://doi.org/10.3390/batteries9040230}, year = {2023}, abstract = {Accelerated cyclic aging tests are very important for research and industry to quickly characterize lithium-ion cells. However, the accentuation of stress factors and the elimination of rest periods lead to an apparent capacity fade, that can be subsequently recovered during a resting phase. This effect is attributed to the inhomogeneous lithium distribution in the anode and is observable with differential voltage analysis (DVA). We tested cylindrical 18,650 cells with Li(NixCoyAlz)O2-graphite/silicon chemistry during two cycling and resting phases. The capacity, the pulse resistance, the DVA, and the capacity difference analysis are evaluated for cells cycled at different average SOC and current rates. An apparent capacity loss of up to 12\% was reported after 200 FCE for cells cycled under the presence of pressure gradients, while only 1\% were at low-pressure gradients. The subsequent recovery was up to 80\% of the apparent capacity loss in some cases. The impact of silicon cannot be estimated as it shows no features in the dV/dQ curves. We observe a recovery of apparent resistance increase, which is not reported for cells with pure graphite anodes. Finally, we demonstrate the strong impact of apparent aging for the lifetime prediction based on standard accelerated cyclic aging tests.}, language = {en} } @article{LechermannKleinerKomsiyskaetal.2023, author = {Lechermann, Lorenz and Kleiner, Jan and Komsiyska, Lidiya and Hinterberger, Michael and Endisch, Christian}, title = {A comparative study of data-driven electro-thermal models for reconfigurable lithium-ion batteries in real-time applications}, volume = {2023}, pages = {107188}, journal = {Journal of Energy Storage}, number = {65}, publisher = {Elsevier}, address = {Amsterdam}, issn = {2352-1538}, doi = {https://doi.org/10.1016/j.est.2023.107188}, year = {2023}, language = {en} } @article{TerbrackSpeerEndisch2023, author = {Terbrack, Christoph and Speer, Sascha and Endisch, Christian}, title = {Control and Implementation of the Parallel Enhanced Commutation Integrated Nested Multilevel Inverter Topology}, volume = {12}, pages = {3130}, journal = {Electronics}, number = {14}, publisher = {MDPI}, address = {Basel}, issn = {2079-9292}, doi = {https://doi.org/10.3390/electronics12143130}, year = {2023}, abstract = {Due to their high efficiency and advanced battery management capability, cascaded multilevel inverters are an exciting option for battery electric powertrains. A promising, new and highly efficient cascaded multilevel inverter is the Parallel Enhanced Commutation Integrated Nested Multilevel Inverter. The inverter, with four semiconductor switches per submodule, can reconfigure individual battery cells in series and parallel and generate positive and negative phase voltages in regular four-quadrant operation. Therefore, emerging degrees of freedom in battery management and inverter operation must be managed and mapped into a specific Switching State for every switch. As controlling the high number of switches is safety-relevant, this publication profoundly explains the inverter's functionality. We introduce a Switching Function that accepts easy-to-understand functional states as input, simplifying research on higher-level control algorithms and advanced single-cell battery-management capabilities. As the Switching Function guarantees safe operation and the correct contribution of every cell to the overall functionality of the inverter, it enables researchers to confidently use and thereby accelerate research on the promising new topology. The method we describe is fast, simple, deterministic and designed to convert setpoint specifications into an executable Switching Pattern. We prove that our Switching Function is operable on an FPGA with a twenty-kilohertz setpoint update operating a 17-level inverter.}, language = {en} } @inproceedings{NachtsheimGrundEndischetal.2023, author = {Nachtsheim, Martin and Grund, Karina and Endisch, Christian and Kennel, Ralph}, title = {Online Identification of Induction Machine Parameter Deviations for Aging Detection - A Comparative Study Using Recursive Least Squares Algorithm and Extended Kalman Filter}, booktitle = {2023 IEEE Transportation Electrification Conference \& Expo (ITEC)}, publisher = {IEEE}, address = {Piscataway}, isbn = {979-8-3503-9742-0}, doi = {https://doi.org/10.1109/ITEC55900.2023.10186964}, year = {2023}, language = {en} } @article{AzzamEhrensbergerScheueretal.2023, author = {Azzam, Mohamed and Ehrensberger, Moritz and Scheuer, Reinhard and Endisch, Christian and Lewerenz, Meinert}, title = {Long-Term Self-Discharge Measurements and Modelling for Various Cell Types and Cell Potentials}, volume = {16}, pages = {3889}, journal = {Energies}, number = {9}, publisher = {MDPI}, address = {Basel}, issn = {1996-1073}, doi = {https://doi.org/10.3390/en16093889}, year = {2023}, abstract = {Self-discharge of lithium-ion cells leads to voltage decay over time. In this work, the self-discharge was measured at 30 °C for three cell types at various voltage levels for about 150 days in a constant voltage mode determining the current at a high precision (float current). All cells exhibit a transient part leading to a steady-state, which is no longer influenced by reversible effects. To study the effect of the check-ups on the steady-state float current, the cells, interrupted and not interrupted by check-ups, were compared. The results indicate that both the transient processes and steady-state currents are highly reproducible. In the first period of the float current, the polarization dominates the measured current, followed by the anode overhang effect dominating the process for a period of 5-30 days. After the decline of both processes, a mostly constant steady-state in the order of µA is observed. The check-up interruption generally shows no apparent effect on the reached steady-state and results only in an extended settling time. A model to simulate the transient process and steady-state of float currents was developed. The model shows a high accuracy in reproducing the results and identifying the time needed to reach the steady-state.}, language = {en} } @inproceedings{TerbrackStoettnerEndisch2020, author = {Terbrack, Christoph and St{\"o}ttner, Julia and Endisch, Christian}, title = {Operation of an externally excited synchronous machine with a hybrid multilevel inverter}, booktitle = {2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-9-0758-1536-8}, doi = {https://doi.org/10.23919/EPE20ECCEEurope43536.2020.9215895}, year = {2020}, language = {en} } @inproceedings{LiebhartDiehlEndisch2020, author = {Liebhart, Bernhard and Diehl, Simon and Endisch, Christian}, title = {Sensitivity analysis of battery cell aging estimators based on impedance spectroscopy regarding temperature compensation}, booktitle = {IEEE CCTA 2020, 4th IEEE Conference on Control Technology and Applications}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-7281-7140-1}, doi = {https://doi.org/10.1109/CCTA41146.2020.9206395}, pages = {699 -- 705}, year = {2020}, language = {en} } @inproceedings{MuellerVoegeleEndisch2016, author = {M{\"u}ller, Tino and V{\"o}gele, Ulrich and Endisch, Christian}, title = {Disturbance compensation for iterative control of suspension durability test rigs}, booktitle = {2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5090-2065-2}, doi = {https://doi.org/10.1109/AIM.2016.7577011}, pages = {1675 -- 1681}, year = {2016}, language = {en} } @article{MuellerZiegmannKrueneretal.2016, author = {M{\"u}ller, Tino and Ziegmann, Johannes and Kr{\"u}ner, Simon and Endisch, Christian}, title = {Optimization of inverse model identification for multi-axial test rig control}, volume = {2016}, pages = {01002}, journal = {MATEC Web of Conferences}, number = {42}, publisher = {EDP Sciences}, address = {Les Ulis}, issn = {2261-236X}, doi = {https://doi.org/10.1051/matecconf/20164201002}, year = {2016}, abstract = {Laboratory testing of multi-axial fatigue situations improves repeatability and allows a time condensing of tests which can be carried out until component failure, compared to field testing. To achieve realistic and convincing durability results, precise load data reconstruction is necessary. Cross-talk and a high number of degrees of freedom negatively affect the control accuracy. Therefore a multiple input/multiple output (MIMO) model of the system, capturing all inherent cross-couplings is identified. In a first step the model order is estimated based on the physical fundamentals of a one channel hydraulic-servo system. Subsequently, the structure of the MIMO model is optimized using correlation of the outputs, to increase control stability and reduce complexity of the parameter optimization. The identification process is successfully applied to the iterative control of a multi-axial suspension rig. The results show accurate control, with increased stability compared to control without structure optimization.}, language = {en} } @inproceedings{AltmannshoferEndischMartinetal.2016, author = {Altmannshofer, Simon and Endisch, Christian and Martin, Jan and Gerngroß, Martin and Limbacher, Reimund}, title = {Robust estimation of vehicle longitudinal dynamics parameters}, booktitle = {2016 IEEE Intelligent Vehicles Symposium (IV)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-5090-1821-5}, doi = {https://doi.org/10.1109/IVS.2016.7535443}, pages = {566 -- 571}, year = {2016}, language = {en} } @inproceedings{AltmannshoferEndisch2016, author = {Altmannshofer, Simon and Endisch, Christian}, title = {Robust Vehicle Mass and Driving Resistance Estimation}, booktitle = {2016 American Control Conference (ACC)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-4673-8682-1}, issn = {2378-5861}, doi = {https://doi.org/10.1109/ACC.2016.7526754}, pages = {6869 -- 6874}, year = {2016}, language = {en} } @inproceedings{AltmannshoferMartinEndisch2015, author = {Altmannshofer, Simon and Martin, Jan and Endisch, Christian}, title = {Robuste, onlinef{\"a}hige Sch{\"a}tzung von Fahrzeugmasse und Fahrwiderst{\"a}nden}, booktitle = {Autoreg 2015: auf dem Weg zum automatisierten Fahren}, publisher = {VDI Verlag}, address = {D{\"u}sseldorf}, isbn = {978-3-18-092233-1}, pages = {29 -- 36}, year = {2015}, language = {de} } @inproceedings{VoegeleEndisch2015, author = {V{\"o}gele, Ulrich and Endisch, Christian}, title = {Potential analysis of predictive optimal velocity control for electric and conventional vehicles}, booktitle = {2015 IEEE International Conference on Vehicular Electronics and Safety (ICVES)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-4673-9114-6}, doi = {https://doi.org/10.1109/ICVES.2015.7396917}, pages = {196 -- 201}, year = {2015}, language = {en} } @inproceedings{MartinVoegeleEndisch2015, author = {Martin, Jan and V{\"o}gele, Ulrich and Endisch, Christian}, title = {Effects of errors in position- and navigation data on predictive vehicle operational strategy optimization}, booktitle = {2015 IEEE International Conference on Vehicular Electronics and Safety (ICVES)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-4673-9114-6}, doi = {https://doi.org/10.1109/ICVES.2015.7396916}, pages = {190 -- 195}, year = {2015}, language = {en} } @inproceedings{StenzelRichnowFrankeetal.2015, author = {Stenzel, Peer and Richnow, Jan and Franke, J{\"o}rg and Endisch, Christian}, title = {Impact of the needle winding technology on the operational behavior of an asynchronous machine}, booktitle = {2015 5th International Electric Drives Production Conference (EDPC)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-4673-7512-2}, doi = {https://doi.org/10.1109/EDPC.2015.7323193}, year = {2015}, language = {en} } @inproceedings{JardanVargaStumpfetal.2015, author = {J{\´a}rd{\´a}n, Rafael K. and Varga, Zolt{\´a}n and Stumpf, P{\´e}ter and Nagy, Istvan and Endisch, Christian and Sipos, P{\´e}ter and Simon, Mikl{\´o}s}, title = {Development of a Dedicated Laboratory System for Measurement of Iron Losses in High Speed PMSM}, booktitle = {2015 IEEE International Conference on Industrial Technology (ICIT)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-4799-7800-7}, doi = {https://doi.org/10.1109/ICIT.2015.7125181}, pages = {708 -- 713}, year = {2015}, language = {en} } @inproceedings{StenzelDollingerRichnowetal.2015, author = {Stenzel, Peer and Dollinger, P. and Richnow, Jan and Bader, T. and Franke, J{\"o}rg and Endisch, Christian}, title = {Experimental investigations of the needle winding technology regarding the influence of the wire guide geometry on the tensile wire force}, booktitle = {2015 IEEE International Conference on Industrial Technology (ICIT)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-4799-7800-7}, doi = {https://doi.org/10.1109/ICIT.2015.7125487}, pages = {2642 -- 2649}, year = {2015}, language = {en} } @inproceedings{StenzelDollingerMihajlovicetal.2014, author = {Stenzel, Peer and Dollinger, P. and Mihajlovic, D. and Richnow, Jan and Franke, J{\"o}rg and Endisch, Christian}, title = {Needle winding for distributed round-wire-windings without the use of insulation disks}, booktitle = {Proceedings: 2014 4th International Electric Drives Production Conference (E|DPC)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-4799-5009-6}, doi = {http://doi.org/10.1109/EDPC.2014.6984387}, year = {2014}, language = {en} } @inproceedings{RichnowStenzelRenneretal.2014, author = {Richnow, Jan and Stenzel, Peer and Renner, A. and Gerling, D. and Endisch, Christian}, title = {Influence of different impregnation methods and resins on thermal behavior and lifetime of electrical stators}, booktitle = {Proceedings: 2014 4th International Electric Drives Production Conference (E|DPC)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-4799-5009-6}, doi = {https://doi.org/10.1109/EDPC.2014.6984406}, year = {2014}, language = {en} } @inproceedings{NachtsheimBetzEndisch2022, author = {Nachtsheim, Martin and Betz, Michael and Endisch, Christian}, title = {Explicit analytical approach for electromagnetic modeling of arbitrary pole pair induction machines}, booktitle = {2022 12th International Conference on Power, Energy and Electrical Engineering (CPEEE)}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-6654-2049-5}, doi = {https://doi.org/10.1109/CPEEE54404.2022.9738660}, pages = {41 -- 48}, year = {2022}, language = {en} } @inproceedings{SchneiderLiebhartEndischetal.2022, author = {Schneider, Dominik and Liebhart, Bernhard and Endisch, Christian and Kennel, Ralph}, title = {Enhanced state and parameter estimation within reconfigurable battery systems for electric vehicles}, booktitle = {2022 12th International Conference on Power, Energy and Electrical Engineering (CPEEE)}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-6654-2049-5}, doi = {https://doi.org/10.1109/CPEEE54404.2022.9738700}, pages = {71 -- 77}, year = {2022}, language = {en} } @article{TheilerSchneiderEndisch2023, author = {Theiler, Michael and Schneider, Dominik and Endisch, Christian}, title = {Experimental Investigation of State and Parameter Estimation within Reconfigurable Battery Systems}, volume = {9}, pages = {145}, journal = {Batteries}, number = {3}, publisher = {MDPI}, address = {Basel}, issn = {2313-0105}, doi = {https://doi.org/10.3390/batteries9030145}, year = {2023}, abstract = {The battery system is one of the most-important, but also -critical components in the electric power-train. The battery's system states and parameters are commonly tracked by the battery monitoring system. However, in reality, the accuracy of the state and parameter estimation may suffer from insufficient excitation of the system. Since the current states and parameters serve as the basis for many battery management system functions, this might lead to incorrect operation and severe damage. Reconfigurable battery systems allow enhancing the system's excitation by applying a switching operation. In this contribution, the state and parameter estimation of a reconfigurable battery module were simulated and tested experimentally. Thereby, a low-exciting and a high-exciting drive cycle were compared. Furthermore, the switching patterns were applied to enhance the excitation and, hence, improve the estimation of an extended Kalman filter. The cells were switched via a pulse-width modulation signal, and the influence of frequency and duty cycle variation on the estimation accuracy were investigated. Compared to the low-excitation input, a significant improvement in the estimation of up to 46\% for the state of charge and 78\% for the internal resistance were achieved. Hereby, low frequencies and duty cycles proved to be particularly advantageous. Switching, however, has only a limited influence on an already highly excited system and may lead to additional aging due to higher heat generation.}, language = {en} } @article{NachtsheimErnstEndischetal.2023, author = {Nachtsheim, Martin and Ernst, Johannes and Endisch, Christian and Kennel, Ralph}, title = {Performance of Recursive Least Squares Algorithm Configurations for Online Parameter Identification of Induction Machines in an Automotive Environment}, volume = {9}, journal = {IEEE Transactions on Transportation Electrification}, number = {3}, publisher = {IEEE}, address = {Piscataway}, issn = {2332-7782}, doi = {https://doi.org/10.1109/TTE.2023.3244619}, pages = {4236 -- 4254}, year = {2023}, language = {en} } @inproceedings{RauscherKalamkarEndisch2024, author = {Rauscher, Andreas and Kalamkar, Siddhanth and Endisch, Christian}, title = {Impact of High Voltage Waveform on Partial Discharge Inception in Electrical Machines}, booktitle = {2024 IEEE 33rd International Symposium on Industrial Electronics (ISIE), Proceedings}, publisher = {IEEE}, address = {Piscataway}, isbn = {979-8-3503-9408-5}, doi = {https://doi.org/10.1109/ISIE54533.2024.10595712}, year = {2024}, language = {en} } @article{AzzamEhrensbergerEndischetal.2024, author = {Azzam, Mohamed and Ehrensberger, Moritz and Endisch, Christian and Lewerenz, Meinert}, title = {Accelerating float current measurement with temperature ramps revealing entropy insights}, volume = {2024}, pages = {114142}, journal = {Journal of Energy Storage}, number = {102, Part B}, publisher = {Elsevier}, address = {Science}, issn = {2352-1538}, doi = {https://doi.org/10.1016/j.est.2024.114142}, year = {2024}, language = {en} } @article{RauscherKaiserDevarajuetal.2024, author = {Rauscher, Andreas and Kaiser, Johannes and Devaraju, Manoj and Endisch, Christian}, title = {Deep learning and data augmentation for partial discharge detection in electrical machines}, volume = {133}, pages = {108074}, journal = {Engineering Applications of Artificial Intelligence}, number = {Part A}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1873-6769}, doi = {https://doi.org/10.1016/j.engappai.2024.108074}, year = {2024}, abstract = {Fault testing in the production line of automotive traction machines is essential to ensure the desired lifetime. Since repetitive partial discharges (PDs) caused by anomalies in the insulation system lead to premature breakdowns of electrical machines, a reliable PD detection is of great importance. This paper proposes deep learning (DL) methods to improve the discrimination of PD from background noise in comparison with the state-of-the-art amplitude based PD detection in the production line. First, a systematic data extraction and labeling procedure is introduced to obtain correctly labeled datasets from arbitrary PD measurements. In addition, datasets are enhanced with low signal-to-noise ratio PD pulses by applying a special data augmentation approach. 13 different convolutional, recurrent and fully connected neural networks are compared for various time-frequency representations of the input signals. Hyperparameters for input transform, network topology and solver are optimized for all 13 combinations to ensure a fair case study. As a result, the two-dimensional convolutional neural network with continuous wavelet transform achieves the best accuracy of around 99.76\% on a test dataset of PD signals originating from previously not utilized test objects. All DL models considered in this comparison outperform the state-of-the-art threshold-based PD classification. Even for PD events with an amplitude close to the noise level, the detection rate is still around 95\% for the best network. Furthermore, without applying the proposed data augmentation procedure, the DL models investigated are not able to distinguish small PD pulses from noise.}, language = {en} } @article{TheilerBaumannEndisch2024, author = {Theiler, Michael and Baumann, Alexander and Endisch, Christian}, title = {Influence of inhomogeneous state of charge distributions on thermal runaway propagation in lithium-ion batteries}, volume = {2024}, pages = {112483}, journal = {Journal of Energy Storage}, number = {95}, publisher = {Elsevier}, address = {Amsterdam}, doi = {https://doi.org/10.1016/j.est.2024.112483}, year = {2024}, abstract = {It is well known that lithium-ion batteries pose a certain safety risk. The thermal runaway of a cell and the subsequent thermal propagation through the battery are considered particularly dangerous. Effective solutions for their mitigation are therefore of great interest. Previous studies have shown the significant influence of a cell's state of charge (SOC) on its behavior during thermal runaway. This relation may be exploitable in a battery pack to improve its safety. This study aims to assess the leverage of active SOC reduction in the imminent threat of thermal runaway. Implementing such a technique could become feasible with the emergence of reconfigurable battery systems. Four experiments were conducted, each with a module of three fresh 63 Ah high energy pouch cells in a spring-loaded bracing. The experiments studied different stationary SOC configurations, uniform (100\% and 60\%) and non-uniform (100\%-60\%-100\% and 100\%-20\%-100\%). The results indicate that thermal propagation is substantially delay (87 s) by discharging a cell in its path. The SOC reduction primarily decreases the maximum temperature of the respective cell. Further effects are a calmer thermal runaway and prolonged propagation time within the cell as well as to the next cell. In comparison, the SOC reduction has little impact on the cell's own triggering time, as the triggering time is mainly determined by the thermal energy transferred from the preceding cell and hence by its SOC. Furthermore, the analysis of the experimental data (temperature, voltage, pressure, video) gives insights into the propagation of thermal runaway through the individual layers of a cell. With reference to the position of a cell relative to the origin of the thermal propagation, a decrease of its mass loss and an increase of its internal propagation time is observed. This effect is attributed to the decreasing module pressure due to progressive loss of material. The assessment shows that active SOC reduction techniques have great leverage for mitigating or even stopping thermal propagation in a battery pack.}, language = {en} } @article{AzzamEndischLewerenz2023, author = {Azzam, Mohamed and Endisch, Christian and Lewerenz, Meinert}, title = {Evaluating the Aging-Induced Voltage Slippery as Cause for Float Currents of Lithium-ion Cells}, volume = {10}, pages = {3}, journal = {Batteries}, number = {1}, publisher = {MDPI}, address = {Basel}, issn = {2313-0105}, doi = {https://doi.org/10.3390/batteries10010003}, year = {2023}, abstract = {This paper provides a comprehensive exploration of float current analysis in lithium-ion batteries, a promising new testing method to assess calendar aging. Float currents are defined as the steady-state trickle charge current after a transient part. In the literature, a correlation to capacity loss was reported. Assuming the float current compensates for the voltage decay over time and is linked to calendar aging, effects from voltage slippery must be considered. The dU/dQ analysis suggests solely a loss of active lithium. Therefore, we investigate the solid electrolyte interphase (SEI) growth as the general aging mechanism to explain the origin of float currents. Our results show that the voltage slippery theory holds true within the low to middle test voltage ranges. However, the theory's explanatory power begins to diminish at higher voltage ranges, suggesting the existence of additional, yet unidentified, factors influencing the float current. A shuttle reaction or lithiation of the cathode by electrolyte decomposition are the most promising alternative aging mechanisms at high voltages. The paper proposes a unique voltage slippery model to check for correlations between aging mechanisms, the float current test and the check-up test. For a better understanding, test strategies are proposed to verify/falsify the aging mechanisms beyond SEI.}, language = {en} } @inproceedings{RauscherStenzelEndisch2024, author = {Rauscher, Andreas and Stenzel, Peer and Endisch, Christian}, title = {Optimization of Sensor Setup and Filter Frequency for End-of-Line Partial Discharge Testing of Electrical Machines}, booktitle = {2024 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles \& International Transportation Electrification Conference (ESARS-ITEC)}, publisher = {IEEE}, address = {Piscataway}, isbn = {979-8-3503-7390-5}, doi = {https://doi.org/10.1109/ESARS-ITEC60450.2024.10819886}, year = {2024}, language = {en} }