Wolfgang Schneider, Dufourstrasse Thun Switzerland W. Schneider Ingenieurbüro, Könizstrasse Liebefeld Switzerland Bieri Hydraulik Ag
{"title":"Fully variable, simple and efficient - electrohydraulic - valve train for reciprocating engines","authors":"Wolfgang Schneider, Dufourstrasse Thun Switzerland W. Schneider Ingenieurbüro, Könizstrasse Liebefeld Switzerland Bieri Hydraulik Ag","doi":"10.25368/2020.107","DOIUrl":"https://doi.org/10.25368/2020.107","url":null,"abstract":"A new camless electrohydraulic valve train concept for combustion engines was developed at Empa (Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland) and tested on a spark ignition passenger car engine. Besides full flexibility with regard to lift and timing of the engine gas exchange valves it features robustness, simplicity and in particular a low own drive power need due to a maximum of hydraulic energy recuperation. The engine test results confirm substantial efficiency gains in classical as well as in hybrid power trains while also maintaining additional advantages. The system also has the potential to become a key element for load control of piston based compressors and expanders, reciprocating Joule Cycle engines and derivable future electricity storage systems.","PeriodicalId":254837,"journal":{"name":"Volume 3 - Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122492524","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":"Design and performance evaluation of next generation clutch control valve","authors":"M. Erhard, J. Schneider, Jan Stein","doi":"10.25368/2020.99","DOIUrl":"https://doi.org/10.25368/2020.99","url":null,"abstract":"Pressure reducing valves perform various control tasks in mobile machines. In many cases contamination sensitive environments require pilot-operated valves, because of its more robust performance. On the other hand, dynamic valve behavior can be critically in certain applications. Overcoming the restrictions resulting from stand-alone test rig attempts, suitable simulation principles are nowadays the state of art in valve design. Unsuitable model approaches and missing consideration of the application may result in wrong design decisions. This paper discusses two important modeling issues, in particular the solenoid and spool leakage behavior, in combination with the connected system under control, a pressure-actuated clutch. It is shown, that even for standard proportional valves a site of installation decides on success or failure of an already used design variant.","PeriodicalId":254837,"journal":{"name":"Volume 3 - Conference","volume":"429 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122866022","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}
Vinícius Vigolo, Gregori Picolotto Conterato, Talles Augusto Bragagnolo Spada, L. Weiss, V. Negri, S. Reivax, João Paulo Florianópolis Brazil Control
{"title":"Energy efficiency and performance of servopneumatic drives for speed governors based on operating points","authors":"Vinícius Vigolo, Gregori Picolotto Conterato, Talles Augusto Bragagnolo Spada, L. Weiss, V. Negri, S. Reivax, João Paulo Florianópolis Brazil Control","doi":"10.25368/2020.94","DOIUrl":"https://doi.org/10.25368/2020.94","url":null,"abstract":"In this paper, the energy efficiency and dynamic performance of servopneumatic drivers are studied aiming at the correct sizing of the system components. The study is carried out through a non-linear dynamic model of a servopneumatic system. The simulation data are used along with the operating point method in order to understand the effect of loading conditions in the system performance, which is then used as a tool for component sizing. The results show the effects that the piston area has on the energy efficiency and dynamic behavior of the system. Moreover, the dependency of the servovalve size on the piston area is elucidated. A procedure to design an effective combination of piston area and sonic conductance of the servovalve is presented. A practical case where a servopneumatic system is being designed for the speed governor of a hydraulic turbine is described, evidencing the suitability of the proposed method for servopneumatic systems.","PeriodicalId":254837,"journal":{"name":"Volume 3 - Conference","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130200165","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}
P. Tamburrano, A. Plummer, P. Palma, E. Distaso, R. Amirante
{"title":"Experimental and numerical study of a novel piezoelectric pilot stage for servovalves","authors":"P. Tamburrano, A. Plummer, P. Palma, E. Distaso, R. Amirante","doi":"10.25368/2020.118","DOIUrl":"https://doi.org/10.25368/2020.118","url":null,"abstract":"Two - stage servovalves, despite being widely used in aircraft and industry because of their reliability and high performance, have a few disadvantages that are still unsolved at the state of the art, such as the power consumption caused by the quiescent flow (internal leakage) in the pilot stage, and the complexity and high number of parts of the torque motor assembly of the pilot stage. The solution to these problems can help to reduce costs, weight, power consumption, and to enhance the reliability and producibility as well as the performance of these valves. This paper presents a novel configuration of servovalve, which has the potential to overcome the above-mentioned issues. The proposed servo-valve includes a novel architecture for the pilot stage by using two piezo-electric actuators (ring benders). In this paper, the performance of this novel pilot stage is assessed. To this end, a valve prototype has been constructed and tested; the experimental results are also used to validate a numerical model obtained with the software Simscape Fluids. The results show that, acting on specific parameters, the performance of the piezo-valve can be very competitive, while ensuring very low internal leakage and complexity.","PeriodicalId":254837,"journal":{"name":"Volume 3 - Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129633283","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":"Active automatic chassis actuation for an excavator","authors":"C. Boes","doi":"10.25368/2020.100","DOIUrl":"https://doi.org/10.25368/2020.100","url":null,"abstract":"This paper shows an electrohydraulic control system to stabilize the chassis of a mobile machine driving across an off-road ground profile. The active hydraulic suspension system is based on new electronics, SWand control architectures and the use of state of the art industrial components. The paper shows, that the static and dynamic performance of the system is dominated by the servo valve, which represents the central component of the system.","PeriodicalId":254837,"journal":{"name":"Volume 3 - Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125978989","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}