CESA abstract : a highly efficiency electrical recuperation system that fits with Hybrid Air technology (PSA Peugeot Citroen)
With this system, during city driving cycle, the vehicle operates in Air Mode, from 60 to 80 % of the time. As thermal engine operation is resultant of this on and off mode, the alternator is mainly shut off. In consequence, the lead-acid battery has strong cycling increase and can be quickly damaged. Besides, it's not suitable to power the electrical equipement during such a long time with only battery voltage (lower than 14 volt).
To fit those requirements, PSA has developed an electrical system called "Spresso", performing two major functions : quick storage and energy management. It can handle with high efficiency, the charge and the discharge of a high-capacity electric double layer capacitor (ELDC), minimzing spare stored energy and makes it possible to supply electricity to all vehicle equipment during Air Mode.
Spresso is compatible with standard 12 volt architecture (alternator and lead-acid battery) and offers a long life and cost effective electrical system to Hybrid Air vehicles.
Georges Clooney would say for sure : "Spresso, what else ?".