The role and use of robust multivariable control in hybrid electric vehicle energy management - Part II: Application

An important role robust multivariable control design could play in Hybrid Electric Vehicle (HEV) was discussed in Part I. In this part, by completing the HEV dynamics, we shall show designing a two-input two-output (TITO) robust controller, using cutting-edge design software of mixed-μ synthesis, for the challenging application of torque management of the hybrid electric vehicle subjected to uncertain parameters and strong coupling interactions between internal combustion engine and integrated electric motor. Our designed control system provides guaranteed stability- and performance robustness for the HEV torque management plant subject to parametric uncertainties (such as combustion lag, rotational moment of inertia and damping), unmodeled complex-valued uncertainty (due to fueling and ignition delays), unmeasurable exogenous plant disturbance (e.g. vehicle load), sensor noises and estimation errors. Simulation results verify that robust multivariable control system designs could significantly help in production of hybrid electric vehicles by significant reduction in cost, risk and time-to-market.