Design and Comparative Analyses of Optimal Feedback Controllers for Hybrid Electric Vehicles

This paper presents an adaptive equivalent consumption minimization strategy (ECMS) and a linear quadratic tracking (LQT) method for optimal power-split control of combustion engine electric machine in hybrid vehicle (HEV). The objective is to deliver demanded torque minimize fuel usage service brakes, subject constraints on actuator limits battery state charge (SOC). First, we derive function calculating maximum deliverable that as close possible then reduce the number inputs one while minimizing brakes case negative torque. Next, propose modeling SOC by tangent or logarithm functions provide interior point both ECMS LQT. Then, show resulting are convex, sub-optimal analytic solutions optimization problem applying their second order approximation about given reference. We also consider robustness controllers measurement noise using simple model noise. Simulation results two compared, effectiveness discussed.