{"title":"Highly efficient clutch system for multispeed BEV","authors":"H. Gürbüz, S. Ott, A. Sutschet, J. Kern","doi":"10.51202/9783181023730-i-119","DOIUrl":"https://doi.org/10.51202/9783181023730-i-119","url":null,"abstract":"","PeriodicalId":244804,"journal":{"name":"Dritev – Drivetrain for Vehicles 2020","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123812591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Virtual RDE: Ensuring RDE conformity of hybridized powertrains in the early stage of the development process","authors":"M. Grill, Mahir-Tim Keskin, M. Bargende","doi":"10.51202/9783181023730-i-343","DOIUrl":"https://doi.org/10.51202/9783181023730-i-343","url":null,"abstract":"With the introduction of \"Real Driving Emissions\" (RDE) powertrain simulation has become indispensable to identify critical operating conditions for the exhaust aftertreatment system at an early stage in the development process and to analyze possible corrective actions. Therefore a rudimentary virtual RDE calibration is also necessary in the early concept phase. For doing so, it makes a lot of sense to use 1D flow simulation to model effects such as boost pressure built-up, high/low pressure EGR travel times or thermal inertia. There are two challenges regarding 1D simulation of RDE: Combustion system development is usually done at single cylinder engines. It is necessary to integrate the results of the single cylinder engine in an effective way into a virtual full engine for RDE investigations and first virtual calibration Moreover, it is typically necessary to investigate a vast number of RDE driving patterns, taking up much more computational time than it was the case previously with a single type-approval driving cycle. Consequently, \"Fast Running Models\" (FRM) that reduce the computational effort needed for flow simulation have been used to counteract this increase. However, it is inevitable that such an approach reduces the accuracy of the boundary conditions at intake valve closing (IVC), e.g. EGR rate, temperature and pressure, and crucially, the predictive power of quasi-dimensional burn rate, emission or knock models is very sensitive to these parameters. Such an approach thus yields results of questionable reliability, with the risk of overlooking critical conditions that have to be addressed later on at much higher costs. Existing data-based approaches avoid these challenges, but fail to depict relevant physical processes in the flow path predictively (boost pressure built-up etc.), making it hardly possible to assess technologies such as variable valve trains. Therefore Robert Bosch GmbH and FKFS developed a new simulation approach. The new tool presented in this paper thus combines a physics-based model for the gas exchange (intake and exhaust system) with a data-based model for the high pressure-part, using mean effective pressure and emission values derived from the test bench or detailed 1D flow simulation. This solves the aforementioned dilemma and provides at the same time an easy way to use test bench data for RDE simulations and powertrain analysis. The implementation of such an approach will be presented in this paper, along with some exemplary results showing how the new tool can be used to generate accurate and reliable results for RDE investigations at minimal computational cost. VDI-Berichte Nr. 2373, 2020 344 https://doi.org/10.51202/9783181023730-I-343 Generiert durch IP '54.244.78.42', am 12.11.2021, 10:42:26. Das Erstellen und Weitergeben von Kopien dieses PDFs ist nicht zulässig. RDE Challenge and Existing SimulationTools From 2017 on new passenger cars in the EU have to fulfil exhaust gas emission limits also ","PeriodicalId":244804,"journal":{"name":"Dritev – Drivetrain for Vehicles 2020","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120947356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Real-driving-based comparison of the eco-impact of powertrain concepts using a data-driven optimization environment","authors":"A. Esser, Tobias Eichenlaub, S. Rinderknecht","doi":"10.25534/TUPRINTS-00011933","DOIUrl":"https://doi.org/10.25534/TUPRINTS-00011933","url":null,"abstract":"In order to limit the effects of man-made climate change, the assessment of the ecological impact of different powertrain concepts is of increasing relevance and intensely studied. In this contribution we present a data-driven optimization environment that enables to identify the ecological potential of different concepts for different scenarios. The parametrization of each powertrain concept is dedicatedly optimized to minimize the ecological impact, which allows for an unbiased and reliable comparison on an uniform evaluation basis. To exploit the potential of each single powertrain parametrization, the operating strategy of the powertrain is adapted. Naturalistic driving profiles, including the speed, acceleration and road-slope information are depicted by multidimensional and representative driving cycles, allowing for an efficient search of the real-driving-optimal powertrain parametrizations within the optimization. In this study, we investigate long-range capable vehicles for a scenario in the reference year 2030 in Germany. Conventional vehicles, battery electric vehicles, fuel cell electric vehicles and plug-in hybrid electric vehicles are examined. Finally, the results are compared to an evaluation of the CO2 emissions according to the Worldwide harmonized Light vehicles Test Procedure (WLTP).","PeriodicalId":244804,"journal":{"name":"Dritev – Drivetrain for Vehicles 2020","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127465404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"New high efficiency CVT for middle class FWD vehicle","authors":"K. Kim","doi":"10.51202/9783181023730-i-271","DOIUrl":"https://doi.org/10.51202/9783181023730-i-271","url":null,"abstract":"Many kinds of transmissions have been developing and recently electrification is processing rapidly to reduce fuel consumption. Automatic transmission has been developing in multistages to improve fuel economy and power performance. CVT, kinds of transmissions, also need to increase the ratio spread to improve the two performances. Thus CVT has better fuel economy performance through the engine’s optimal operating. So, CVT would be a good solution for fuel economy among the conventional transmissions. The newly developed CVT for FWD vehicles has wider pulley ratio spread than any other competitors. And in spite of wide ratio coverage, CF28 has good competitiveness in the overall length by minimizing the length increase. In spite of reducing transmission length, we had achieved maximum torque capacity, minimum length, highest efficiency, and largest pulley ratio coverage compared to competitors’ middle-class CVTs. Introduction Recently many kinds of transmissions have been continuously developing to increase driving performance and reduce fuel consumption, And to achieve vehicle mount-ability, it necessary to miniaturize the transmission, because the room for transmission gets smaller and smaller. The newly Continuous Variable Transmission(CF28) for the front-wheel-drive vehicle which was recently developed, substantially enlarge the torque capacity based on the current Small-CVT(CF18). Nevertheless, the driving performance has greatly improved through the expansion of ratio span, the competiveness of efficiency, weight and overall length is the best in the same class CVT. The planetary gear was newly designed to reduce the overall length of the transmission and the clutch, hydraulic system, torque converter and oil pump were optimized to improve the efficiency. And the belt & pulley also had been newly designed for the wider ratio span, fewer components, and shorter overall length, lower the weight. In this paper, the new planetary gear, new belt & pulley system, and newly optimized systems for marketability would be described. VDI-Berichte Nr. 2373, 2020 271 https://doi.org/10.51202/9783181023730-I-271 Generiert durch IP '54.70.40.11', am 29.09.2021, 19:39:39. Das Erstellen und Weitergeben von Kopien dieses PDFs ist nicht zulässig. <Specification Comparison> CF18 (Existing Model) CF28 (New Model) Torque Capacity [kgf.m] 18.3 28 Overall Length [mm] 351 359 Gear Span [UD/OD] 7.0 7.5 Weight [Wet, kg] 73 88 TORQUE-UP, MINIMIZING AND WEIGHT REDUCTION Figure 1 below shows that the CVT for front-wheel (CF18), which is currently in production, has one planetary gear set, one clutch set and one brake set. The newly developed CF28 has been increased only 8mm in overall length despite the fact that the torque capacity was increased by 53% compared to the current mass production CF18. Fig. 1: Cross section of CF18 Fig. 2: schematic of CF18 The following is a description of how we were able to minimize the increase of the overall length and weight. 1. Struct","PeriodicalId":244804,"journal":{"name":"Dritev – Drivetrain for Vehicles 2020","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127522908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Consistently quattro","authors":"L. Wittmann, M. Wein, M. Wolf","doi":"10.51202/9783181023730-i-159","DOIUrl":"https://doi.org/10.51202/9783181023730-i-159","url":null,"abstract":"","PeriodicalId":244804,"journal":{"name":"Dritev – Drivetrain for Vehicles 2020","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116593291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A new generation of thermal fluid technology for high performance charging of electric vehicles – How new thermal fluids can enhance battery performance in EVs","authors":"V. Null","doi":"10.51202/9783181023730-ii-97","DOIUrl":"https://doi.org/10.51202/9783181023730-ii-97","url":null,"abstract":"","PeriodicalId":244804,"journal":{"name":"Dritev – Drivetrain for Vehicles 2020","volume":"178 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123300475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Automotive industry in Europe: delivering on the Green Deal","authors":"S. D. Vries","doi":"10.51202/9783181023730-i-305","DOIUrl":"https://doi.org/10.51202/9783181023730-i-305","url":null,"abstract":"","PeriodicalId":244804,"journal":{"name":"Dritev – Drivetrain for Vehicles 2020","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128093298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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