Cross-Domain Collaborative Oscillation Control Strategy for a Hybrid Driveline Based on the Integration of a Notch Filter, PI filter, and Backlash Estimator

Abstract This work studies torque oscillation control of a hybrid driveline, and proposes a new cross-domain collaborative (C2) control strategy that comprises a notch filter, a PI filter, and a backlash estimator. The C2 control strategy is centered on a notch filter, which is built on digitalization of the driveline system and analyses of oscillation elements in the frequency domain. To enhance the performance of the notch filter in the time domain, a PI filter is connected in series to the notch filter. Considering that the driveline is a nonlinear time system during backlash travel, a backlash estimator is developed to handle the torque control target. The notch frequency and backlash travel time are identified through simulations, and the control strategy and selected parameters are evaluated in road tests. The results indicate that this control strategy can reduce the peak torsion speed to 71%.