He, Ping (2024)
Overall evaluation of drive-off procedures in a mild hybrid powertrain.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00028793
Dissertation, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
This work deals with the combined investigation of subjective and ecological evaluation of the drive-off dynamics of passenger vehicles. The main focus is on the drive-off procedure in a mild hybrid powertrain. A connection between the subjective driving impression and ecological factors such as fuel consumption and the thermal load in the clutch is established. In order to investigate the subjective evaluation of the drive-off dynamics, three test subject studies are conducted with the focus on influence factors maximum acceleration, mean jerk, response time, and engine speed changes. In each study, evaluation criteria related to driving dynamics and ride comfort are used. Statistical tests are carried out to identify the evaluation difference thresholds for these influence factors. The evaluation criteria, sportiness, jerkiness, and comfort, which are used in the ecological evaluation to assess the drive-offs, are objectivated by using a logistic regression model based on the maximum acceleration and mean jerk. The hybrid modeling approach introduced for the ecological evaluation, which combines forward and backward modeling, ensures a precise simulation of the drive-off behavior. This approach also fulfills the requirement to maintain the neutrality of the battery's state of charge in the mild hybrid powertrain and to follow the reference driving cycle with high accuracy. The results show that the fuel consumption benefits of using the electric motor are most significant during drive-offs at low accelerator pedal positions, but this advantage decreases with increasing accelerator pedal positions due to compensatory fuel consumption for battery recharging. Furthermore, the work underlines the ecological advantages of support by the electric motor in terms of reducing the thermal load in the clutch. It proves to be effective in reducing thermal load during drive-off and sequential gear upshifting when the electric motor operates as a drive. These advantages go beyond the immediate thermal load reduction and contribute to the goals of sustainable and efficient vehicle design. For the calibration process, it is beneficial to understand the effects of changes in drive-off dynamics on user experience and ecological aspects. The results of this work provide valuable insights for the calibration process to facilitate fine-tuning of the drive-off characteristics taking into account both subjective driving impression and ecological factors.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2024 | ||||
Autor(en): | He, Ping | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Overall evaluation of drive-off procedures in a mild hybrid powertrain | ||||
Sprache: | Englisch | ||||
Referenten: | Rinderknecht, Prof. Dr. Stephan ; Fister, Prof. Dr. Michael | ||||
Publikationsjahr: | 25 November 2024 | ||||
Ort: | Darmstadt | ||||
Kollation: | XVI, 149 Seiten | ||||
Datum der mündlichen Prüfung: | 13 Februar 2024 | ||||
DOI: | 10.26083/tuprints-00028793 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/28793 | ||||
Kurzbeschreibung (Abstract): | This work deals with the combined investigation of subjective and ecological evaluation of the drive-off dynamics of passenger vehicles. The main focus is on the drive-off procedure in a mild hybrid powertrain. A connection between the subjective driving impression and ecological factors such as fuel consumption and the thermal load in the clutch is established. In order to investigate the subjective evaluation of the drive-off dynamics, three test subject studies are conducted with the focus on influence factors maximum acceleration, mean jerk, response time, and engine speed changes. In each study, evaluation criteria related to driving dynamics and ride comfort are used. Statistical tests are carried out to identify the evaluation difference thresholds for these influence factors. The evaluation criteria, sportiness, jerkiness, and comfort, which are used in the ecological evaluation to assess the drive-offs, are objectivated by using a logistic regression model based on the maximum acceleration and mean jerk. The hybrid modeling approach introduced for the ecological evaluation, which combines forward and backward modeling, ensures a precise simulation of the drive-off behavior. This approach also fulfills the requirement to maintain the neutrality of the battery's state of charge in the mild hybrid powertrain and to follow the reference driving cycle with high accuracy. The results show that the fuel consumption benefits of using the electric motor are most significant during drive-offs at low accelerator pedal positions, but this advantage decreases with increasing accelerator pedal positions due to compensatory fuel consumption for battery recharging. Furthermore, the work underlines the ecological advantages of support by the electric motor in terms of reducing the thermal load in the clutch. It proves to be effective in reducing thermal load during drive-off and sequential gear upshifting when the electric motor operates as a drive. These advantages go beyond the immediate thermal load reduction and contribute to the goals of sustainable and efficient vehicle design. For the calibration process, it is beneficial to understand the effects of changes in drive-off dynamics on user experience and ecological aspects. The results of this work provide valuable insights for the calibration process to facilitate fine-tuning of the drive-off characteristics taking into account both subjective driving impression and ecological factors. |
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Alternatives oder übersetztes Abstract: |
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Freie Schlagworte: | Mild Hybrid Powertrain, Evaluation, Drive-off Procedure, ECMS, DCT, Driving Style Classification, Human Perception, Evaluation Threshold, Subjective Criteria, Ecological Criteria | ||||
Status: | Verlagsversion | ||||
URN: | urn:nbn:de:tuda-tuprints-287932 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau | ||||
Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Institut für Mechatronische Systeme im Maschinenbau (IMS) 16 Fachbereich Maschinenbau > Institut für Mechatronische Systeme im Maschinenbau (IMS) > Fahrzeugantriebe |
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TU-Projekte: | Magna Powertrain|4500554480|Untersuchung von Anf | ||||
Hinterlegungsdatum: | 25 Nov 2024 13:09 | ||||
Letzte Änderung: | 26 Nov 2024 06:39 | ||||
PPN: | |||||
Referenten: | Rinderknecht, Prof. Dr. Stephan ; Fister, Prof. Dr. Michael | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 13 Februar 2024 | ||||
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