Patent ID: 6841972
Filing Date: 2005-01-11
Classification: B60K,B60L,B60W,G01R,H02J,Y02T

Abstract:
1. A method for resetting a state of charge of a battery for a hybrid electric vehicle, comprising: determining whether a discharge current of the battery is greater than a predetermined discharge current; determining whether a minimum voltage module has changed, if the discharge current of the battery is greater than the predetermined discharge current; determining whether a theoretical discharge voltage is greater than a voltage of the minimum voltage module, if the minimum voltage module has changed; determining whether the theoretical discharge voltage remains greater than the voltage of the minimum voltage module for a predetermined period of time, if the theoretical discharge voltage is greater than the voltage of the minimum voltage module; setting a state of charge of the battery as a very low state, if the theoretical discharge voltage remains greater than the voltage of the minimum voltage module for the predetermined period of time; determining whether the theoretical discharge voltage is greater than average voltage of a plurality of modules of the battery, if the theoretical discharge voltage is not greater than the voltage of the minimum voltage module; determining whether the theoretical discharge voltage remains greater than the average voltage for a predetermined period of time, if the theoretical discharge voltage is greater than the average voltage; and setting a state of charge of the battery as a low SOC state, if the theoretical discharge voltage remains greater than the average voltage for the predetermined period of time.