MECCA Journal of Middle European Construction and Design of Cars最新文献

{"title":"CRITICAL SHIFTING WINDOW IN SWITCHABLE ROCKER FINGER FOLLOWER","authors":"Petr Kohout, Jan Kindermann","doi":"10.14311/mecdc.2021.01.01","DOIUrl":"https://doi.org/10.14311/mecdc.2021.01.01","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000A valvetrain including switchable rocker finger follower is capable of discrete switching between two modes (two cam profiles). The exact moment when switching occurs is called crossover point and this paper reviews the factors that cause the shift of the crossover point from its nominal design position. The range where crossover point can shift is called critical shifting window and its size and factors influencing it will be adressed. \u0000 \u0000 \u0000 \u0000","PeriodicalId":321288,"journal":{"name":"MECCA Journal of Middle European Construction and Design of Cars","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129871714","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":"RANGE EXTENDER ICE MULTI-PARAMETRIC MULTI-OBJECTIVE OPTIMIZATION","authors":"Mikuláš Adámek, R. Toman","doi":"10.14311/mecdc.2021.01.02","DOIUrl":"https://doi.org/10.14311/mecdc.2021.01.02","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000Range Extended Electric Vehicles (REEV) are still one of the suitable concepts for modern sustainable low emission vehicles. REEV is equipped with a small and lightweight unit, comprised usually of an internal combustion engine with an electric generator, and has thus the technical potential to overcome the main limitations of a pure electric vehicle – range anxiety, overall driving range, heating, and air-conditioning demands – using smaller battery: saving money, and raw materials. Even though several REx ICE concepts were designed in past, most of the available studies lack more complex design and optimization approach, not exploiting the advantageous single point operation of these engines. Resulting engine designs are usually rather conservative, not optimized for the best efficiency. This paper presents a multi-parametric and multi-objective optimization approach, that is applied on a REx ICE. Our optimization toolchain combines a parametric GT-Suite ICE simulation model, modeFRONTIER optimization software with various optimization strategies, and a parametric CAD model, that first provides some simulation model inputs, and second also serves for the final designs’ feasibility check. \u0000The chosen ICE concept is a 90 degrees V-twin engine, four-stroke, spark-ignition, naturally aspirated, port injected, OHV engine. The optimization goal is to find the thermodynamic optima for three different design scenarios of our concept – three different engine displacements – addressing the compactness requirement of a REx ICE. The optimization results show great fuel efficiency potential by applying our optimization methodology, following the general trends in increasing ICE efficiency, and power for a naturally aspirated concept. \u0000 \u0000 \u0000 \u0000","PeriodicalId":321288,"journal":{"name":"MECCA Journal of Middle European Construction and Design of Cars","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116062522","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 ADVANCED METHODS IN SIDE CRASH TESTING","authors":"J. Jelínek, M. Růžička, Alžběta Kafková","doi":"10.14311/MECDC.2020.02.01","DOIUrl":"https://doi.org/10.14311/MECDC.2020.02.01","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000This work follows up the previous work [1] regarding the used methodology in the field of passive safety, ie. crash testing. The work is based on experience gained in the Active Lateral Impact Simulator (ALIS) project and describes complete process. The main focus has been given to the fine-tuning of the boundary conditions and loading of the system in order to ensure correct biomechanical loads. \u0000 \u0000 \u0000 \u0000","PeriodicalId":321288,"journal":{"name":"MECCA Journal of Middle European Construction and Design of Cars","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133513669","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":"TESTING OF AUTOMATED DRIVING SYSTEMS","authors":"O. Vaculín, Michael Gellrich, Robert Matawa, Steffen Witschass","doi":"10.14311/mecdc.2020.01.02","DOIUrl":"https://doi.org/10.14311/mecdc.2020.01.02","url":null,"abstract":"The automated driving requires new testing approaches, which are more complex than the current testing systems. The complexity and requirements for accuracy is important, because of interconnection of virtual with physical testing. This paper presents a generic approach to testing of automated driving functions and demonstrates its implementation on measurement of two scenarios.Automatizované řízení vyžaduje nové testovací přístupy, které jsou daleko komplexnější než současné testovací systémy. Komplexnost a požadavky na přesnost jsou důležité z pohledu na propojení fyzického a virtuálního testování. Tento článek prezentuje obecný přístup k testování funkcí automatizovaného řízení a demonstruje jeho implementaci na měřeních dvou scénářů.","PeriodicalId":321288,"journal":{"name":"MECCA Journal of Middle European Construction and Design of Cars","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130839710","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":"AUTONOMOUS VEHICLES AND EUROPEAN DATA PROTECTION LAW","authors":"E. Fialová","doi":"10.14311/mecdc.2020.01.01","DOIUrl":"https://doi.org/10.14311/mecdc.2020.01.01","url":null,"abstract":"Autonomous vehicles process a huge amount of data about the driver, or rather passengers of the vehicle, as well as about other persons (pedestrians and passengers of other vehicles). This is why the autonomous vehicles raise questions about the protection of personal data. In 2018 a new European data protection legislation came into force. The General Data Protection Regulation places new obligations on controllers of personal data and provides new rights to data subjects, which will relate to operations of autonomous vehicles and their infrastructure. The providers thereof will have to implement the principles of data protection legislation into their systems. In this context the personal data is not just data concerning the identity of the driver, a passenger or other persons, but any information relating to an identified or identifiable natural person who can be identified, directly or indirectly, in particular by reference to an identifier such as a name, an identification number, location data, or even due to a peculiar behaviour in the vehicle. The paper will focus on the new legal regulation in relation to the operation of autonomous vehicles.Autonomní vozidla zpracovávají velké množství údajů o řidiči vozidla, resp. cestujících ve vozidle, jakož i o dalších osobách (spolucestujících, chodcích a pasažérech v jiných vozidlech). To je důvod, proč provoz autonomních vozidel vyvolává řadu otázek týkajících se ochrany osobních údajů. V roce 2018 nabyla účinnosti nová evropská právní úprava regulující tuto oblast. Obecné nařízení o ochraně osobních údajů přináší nové povinnosti správcům osobních údajů, jakož i nová práva subjektům údajů, která se budou týkat provozu autonomních vozidel a infrastruktury. Výrobci a poskytovatelé služeb budou muset do svých systémů implementovat legislativu o ochraně osobních údajů. Osobními údaji nejsou pouze údaje týkající se totožnosti řidiče, cestujících nebo jiných osob, ale veškeré informace vztahujících se k identifikované nebo identifikovatelné fyzické osobě, kterou lze přímo nebo nepřímo identifikovat, zejména odkazem na identifikátor, jako je např. název, identifikační číslo, lokalizační údaje, nebo třeba i kvůli osobitému chování ve vozidle. Tento článek se zaměřuje na novou právní úpravu ve vztahu k provozu autonomních vozidel.","PeriodicalId":321288,"journal":{"name":"MECCA Journal of Middle European Construction and Design of Cars","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131884474","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":"IN-CYLINDER FLOW CHARACTERIZATION USING VORTICITY BASED PARAMETERS","authors":"Petr Hatschbach, O. Vitek, R. Tichánek","doi":"10.14311/mecdc.2021.01.03","DOIUrl":"https://doi.org/10.14311/mecdc.2021.01.03","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000The paper deals with intake swirling flow characterization in the cylinder of IC engine. The commonly used method based on the swirl resp. tumble number from angular momentum flux evaluation does not need to give the appropriate values in some cases. Typically, in the case of two intake ports, a counter-rotating swirl vortex pair is presented. However their summary angular momentum flux is zero a thus corresponding swirl number is zero too. In order to correctly quantify these cases, it is proposed to evaluate so called vorticity numbers, i.e. dimensionless numbers based on vorticity evaluation. Concrete results are evaluated from data obtained using 3-D CFD simulation in AVL FIRE code. Comparison of variously defined vorticity numbers with each other and with the vortex numbers is performed. A practical way of calculating the vorticity numbers was also suggested with regard to possible adverse effects of the velocity gradients at the cylinder wall. \u0000 \u0000 \u0000 \u0000","PeriodicalId":321288,"journal":{"name":"MECCA Journal of Middle European Construction and Design of Cars","volume":"169 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126746839","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}