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Item type:Publication, Access status: with files , Control methods of powertrains with backlash and time delay(2019); In this work methods are presented to reduce driveline oscillations and preserve high performance during load changes for conventional, parallel hybrid electrified, and battery electrified powertrains. The methods address the dominant dynamics of backlash and time delay in the powertrain. Differentially flatness is used to invert the driveline system. Time delay compensation methods are formulated and compared with regard to stability and damping behavior using stability diagrams. The most promising compensation approach is combined with the nonlinear flatness-based feedforward control strategy to control powertrains with backlash and time delay.Publicationtype: Doctoral Thesis928 2469 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Anti-jerk control of a parallel hybrid electrified vehicle with dead timeAnti-jerk controller are essential for drive comfort during load-changes, since they reduce undesired driveline oscillations. Hybrid electrified vehicles enable greater degree of freedom to control these oscillations due to the two actuators, namely internal combustion engine and electric machine. At the same time the more complex communication structure of electronic control units in a hybrid electrified vehicle inserts more time delay in the system, which can cause instability in driveline oscillation control. This paper analysis the effect of dead time on a parallel hybrid electrified driveline model with proportional feedback controller and present a feedforward and feedback strategy with dead time compensation. Simulation results of the proposed approach show good step-response behavior and robustness against dead time.Publicationtype: Journal ArticleScopus© Citations 7 185 280 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Driveline control - intelligent actuator inputs to improve component protection, performance and comfort(2017-07); ; ; In the last years, the growing number of electronic units in passenger cars allows to intervene intelligently in the drive system for specific situations. In order to reduce undesired driveline oscillations, which can damage components, reduce performance and comfort, control strategies are necessary. These oscillations occur for example due to misuse maneuver, load changes, gear changes or irregularity of the internal combustion engine. Therefore, engine torque, clutch torque and torque of an electric machine, respectively, can be used as control input depending on the drive technology and scenario. In this article various stressful oscillations in a frequency band to 60 Hertz are introduced and analyzed. To overcome these problems, new control methods are presented. Thereby, the challenges in nonlinear control design of dead time and mechanical backlash are specified.Publicationtype: Conference Paper73 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Nonlinear flatness-based control of driveline oscillations for a powertrain with backlash traversingLoad changes in automotive powertrains may cause uncomfortable vibrations during vehicle acceleration. These driveline oscillations occur due to flexible and underdamped shafts. Furthermore, backlashes in the drive train represent hard nonlinearities and lead to challenges in control. Reducing vibration only by feedback control may destabilize the closed loop due to time delays in the powertrain system. This paper proposes a flatness-based feedforward control law based on a two-mass powertrain model with backlash to compensate oscillations. In addition, a proportional feedback controller is used to damp remaining oscillations arising from model mismatches and disturbances after the set-point transition. Simulation results show improved tracking performance in comparison to a feedforward approach without considering backlash explicitly.Publicationtype: Journal ArticleScopus© Citations 20 125 267