Technical Paper
Analysis of flatness based active damping control of hybrid vehicle transmission
2024-04-09
2024-01-2782
Driver torque demands in automotive drivetrains can result in uncomfortable jerk oscillations during vehicle accelerations and decelerations. These drivetrain oscillations occur due to the flexibility and underdamped nature of transmission shafts and backlashes. Furthermore, active transmission damping has gained increased interest since the introduction of vehicle hybridization. Indeed, with the integration of electrical machines in hybrid vehicles, high-performance active transmission damping can be achieved. However, the suppression of drivetrain oscillations remains a challenge in practical applications. This is primarily due to technological constraints, such as actuation lag, limited available measured variables, and measurement delays. Achieving the desired performance with a complete feedback control system is difficult without pushing the robustness margins to their limits. Consequently, a feedforward controller should complement this approach.