Patent ID: 7829229
Filing Date: 2010-11-09
Classification: H01M,Y02E

Abstract:
1. A hybrid fuel cell system comprising: a fuel cell stack; a power source; and a controller sub-system including a cell voltage controller, a damped driver power request controller and a power balancing and limiting controller, said cell voltage controller including a first look-up table responsive to a power source state of charge signal and providing a cell voltage set-point signal based on the state of charge of the power source, said cell voltage controller further including a subtractor for subtracting the cell voltage set-point signal from an actual cell voltage signal, said cell voltage controller further including a proportional controller responsive to the subtracted signal and providing a proportional cell voltage gain signal, said damped driver power request controller receiving the state of charge signal and a driver power request signal, said damped driver power request controller including a filter that damps the driver power request signal based on the state of charge signal, said controller sub-system adding the damped power request signal and the gain signal, said power balancing and limiting controller being responsive to the added power request and gain signal and the driver power request signal, and setting a power demand signal for the stack and the power source.