Active torsional vibration reduction: potential analysis and controller development for a belt-driven 48 V system

Modern internal combustion engines (ICE) reach higher peak pressure thanks to the improved thermodynamic processes and charging technologies. Passive vibration damping approaches face challenges motivating the application of active methods. Active torsional vibration reduction achieves reduced torsional oscillations using the compensation torque generated by an electric traction machine (ETM). 48 V-based hybridization is gaining increased attention as an intermediate step towards higher levels of powertrain electrification. This trend opens new challenges for active vibration reduction with non-inline integration of the ETM using belt drive systems. We analyze the available potential for active torsional vibration attenuation in such belt drive systems in combination with a 48 V belt-driven starter generator (BSG). The study shows that a dual-mass flywheel (DMF) with a centrifugal pendulum absorber can be replaced by a simplified DMF with active vibration reduction using the 48 V BSG system. The effectiveness of active vibration reduction depends on the control functionality. In this contribution, we present an adaptive controller which does not require sensors for reference signal measurement. Besides simulative analysis, the performance of the proposed controller is demonstrated on the experimental test setup with a 2-cylinder ICE and an ETM in an inline configuration.