Integrated microprocessor control of a hybrid i.c. engine/battery-electric automotive power train

This paper describes the development of a fully integrated microprocessor control system for a hybrid i. c. -enginelbattery-electric automotive power train. Torque control systems for the internal-combustion engine and the electric-traction motor are designed using digital transfer functions and indirect methods of torque measurement. Root-locus methods are used in all designs to provide fast, critically damped closed-loop response. In all cases simple proportional-plus-integral control proved sufficient to achieve this. An overall cycle speed controller allows the laboratory test system to be exercised over any test driving cycle and offers the ability to carry out sophisticated power sharing and transmission shifting strategies.