Quantitative feedback robust controller design for hydrostatic transmission hybrid vehicle

To deal with such problems in the hydrostatic transmission hybrid vehicle (HTHV) as large parameter perturbation and significant load change in vehicle starting and braking, the quantitative feedback theory was employed to shaping the transmission loop to get the robust stability, restrain the disturbance and enhance the tracking behavior. A robust controller with the friction torque compensation was designed to control the HTHV. Test results showed that the developed quantitative feedback robust controller is characterized by the good control result, effective attenuation of the parameter perturbation, the external disturbance and the effect of the intensive nonlineasity, improving the robust stability and the dynamic performance of the system.