96 C YL I N D E R D E A C T I V A T I O N 5 975 C Y L I N D E R D E A C T I V A T I O NSchaeffler Symposium 2018 range operating speeds and loads When it comes to reducing emissions the initial firing of a cylin der after deactivation is particularly critical Schaeffler has counteracted this with what is known as boot cam elevation In the process re sidual gas is retained in the inlet duct before cy linder deactivation then enters into the combus tion chamber together with the fresh gas during the intake stroke of the subsequent fired working cycle This approach also facilitates on demand control of the residual gas including further de throttling via variable intake valve closing in rolling cylinder deactivation mode to optimize the mixture formation and stabilize combustion The end result is a level of performance under all cy linder engine operation that offers comparable raw engine out emissions which overall can be regarded as inconspicuous Literature 1 Faust H Drive Systems of the Future 10 Schaeffler Kolloquium 2014 2 Scheidt M Brands Ch Lang M Kuhl J Günther M Medicke M Vogler C Static and Dynamic Cylinder Deactivation on 4 Cyl inder and 3 Cylinder Engines International Engine Congress Baden Baden 2015 3 Schamel A Scheidt M Weber C Faust H Cylinder Deactivation for Turbocharged 3 Cylinder Engines Feasible and Practical 36th International Vienna Motor Symposium 2015

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