An intelligent alternator control strategy for automotive applications

Intelligent peripheral control provides an opportunity for increased fuel efficiency and reduced emissions. Maximum benefit is achieved when combined with a hybrid vehicle architecture. A control strategy and related hardware are described that operate the 12-V alternator and accessories more efficiently than voltage regulator strategies that are currently employed by utilizing the energy storage of the 12-V battery in a mode that expands its functionality. This feature complements the energy savings in the high-voltage hybrid components of the vehicle. The results show that gains in fuel economy can be obtained through reduced high load accessory drag and lower idle losses.