112 VA R I A BL E V ALV E T R A I N S Y S T E M S 6 1136 V A R I A BL E V ALV E T R A I N S Y S T E M SSchaeffler Symposium 2018 pensive alternative systems With the Y shaped twin pallet switchable finger follower which can actuate two intake or two exhaust valves at the same time Schaeffler offers a very compact and cost effective approach to cylinder deactivation Schaeffler develops hydraulically actuated swit ching components as well as the eRocker System for cylinder deactivation and cam profile switch ing as used for secondary exhaust valve lift on diesel engines This electromechanical system is designed as a plug and play solution that does not impact the oil circuit of the engine and is therefore easy and convenient to integrate where as the hydraulic system continues to be a cost effective concept for high volume applications Ever stricter emissions requirements also in crease the need for variability in the valve train as used in diesel engines In this context combus tion systems with a high internal EGR rate that are implemented by switching the exhaust valves via a secondary valve lift are of particular interest By integrating the innovative function of a handover lift the timing of the secondary lift can be adap ted to the specific engine application environ ment such that further emission and NVH benefits can also be attained Better control over exhaust gas recirculation is made possible by approaches that use different secondary lift heights at both exhaust valves that can be combined at will This arrangement is considerably easier to implement than a hydraulically switching system thanks to the eRocker System and its minimal implications for engine peripherals In a three cylinder production diesel engine with secondary exhaust valve lift the eRocker System successfully proved its basic operative function and the ease of application Further activities in clude adaptation for cylinder deactivation on a gasoline engine in the first half of 2018 followed by the independent switching of both exhaust valves on a diesel engine in the second half of the year Literature 1 Ihlemann A Nitz N Cylinder Deactivation A Technology with a Future or a Niche Appli cation 10 Schaeffler Kolloquium 2014 2 Press release from Ford Werke AG World pre miere Ford fits the EcoBoost three cylinder engine with fuel saving cylinder deactivation http www presseportal de pm 6955 3497442 3 Mitsubishi press release The 4N13 1 8 lit er 4N14 2 2 liter diesel engines realize low fuel consumption low emissions and low combustion noise for the European market www mitsubishi motors com 4 Terazawa Y Nakai E Kataoka M Sakono T The new Mazda four cylinder diesel en gine In MTZ 72 2011 No 9 5 Brauer M Pohlke R Berndt R Manns J Elicker M Brands C Scheidt M Variable valve train in diesel engines as key technolo gy for compliance with future emission limits and further downsizing SIA Magazine In génieurs de l automobile no 884 11 2016 and SIA Powertrain Conference 2016 Rouen France 07 2016 6 Himsel F Christgen W Schmidt V Valve Train Trends Variability for Future Gasoline and Diesel Engine Applications VDI confer ence on valve train and cylinder head technol ogy Würzburg 2017

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