Phase deviation of semi-active suspension control and its compensation with inertial suspension

The performance of vehicle suspension is evaluated based on three conflicting indexes: body acceleration, suspension deflection, and dynamic tire load, which vary across different frequency bands. The suspension control strategy faces the challenge to strike a balance among these indexes. This research analyzes the fundamental mechanism of control phase deviation effects on skyhook damper control, groundhook damper control, and acceleration drive damper control. From the perspective of complex domain mechanical impedance with the support of the inertial suspension, a structure-based compensation approach is proposed to address for the control phase deviation. The simulation analysis demonstrates that the coordination of inertial suspension structure and control strategy can effectively enhance the comprehensive suspension performance across entire frequency range. Finally, a semi-active inertial suspension bench is implemented. The experimental results indicate that the suspension with the semi-active inertial suspension has outstanding vibration isolation ability, and enhances the suspension performance at ride comfort, suspension deflection, and road friendly significantly.