System Simulation and Verification of an Innovative Active Torsional Vibrational Absorber for Engine Cylinder Deactivation, Down Speeding Best Comfort

摘要

Vehicle powertrains are strongly following the trend of down-speeding and down-sizing in combination with highly turbocharged engines and reduced number of cylinders. These measures challenge the capability of current torsional vibrational damping (TVD) systems. Introduction of cylinder deactivation adds a new dimension of complexity to this, as now the TVD systems have to tackle with different orders of torque fluctuation in the same drive train. In this paper we present our highly innovative active torsional vibration absorber system, which provides an excellent damping performance. The paper includes the concept description of the absorber system, which includes a variable torsional stiffness that can be actively changed to achieve best isolation of the particular dominant fluctuations. The isolation performance of the system is evaluated with drive line simulations and verified with component tests. The presented results show this systems capability, which perfectly supports the trends of cylinder deactivation, extreme down speeding, and downsizing. In addition to this the system further reduces damper noises, which are caused during engine cranking, and therefore can provide a big advantage by complementing the needs of engine start-stop systems.