Patent ID: 6091228
Filing Date: 2000-07-18
Classification: B60K,B60L,B60W,Y02T,Y10S

Abstract:
A method for controlling the state of charge of a battery of a hybrid electric vehicle around a set state of charge which is less than full charge, by controlling an electrical power generator, said method comprising the steps of:estimating the state of charge of said battery to generate signals representative of the existing state of charge of said battery;generating signals representative of the desired state of charge of said battery;taking the difference between said signals representative of the existing (present) state of charge and said signals representative of the desired state of charge to generate state-of-charge error signals;processing said state-of-charge error signals by at least integrating, to produce desired generator current signals;sensing the generator current to produce existing generator current signals;taking the difference between said existing generator current signals and said desired generator current signals to produce generator-current error signals;processing said generator-current error signals by at least integration to produce a generator output current command; andcontrolling the electrical current output of said generator in response to said generator output current command.