Patent ID: 9499040
Filing Date: 2016-11-22
CPC Classification: B60K,B60W,Y02T,Y10S

Claim Text:
1. A method for operating a hybrid powertrain system in a plug-in hybrid vehicle, comprising: initially operating the hybrid powertrain system in a charge-depletion mode to reduce a state-of-charge (SOC) of an energy storage device; monitoring the SOC of the energy storage device; operating the hybrid powertrain system in a charge-sustaining mode only when the SOC of the energy storage device decreases to a predetermined minimum SOC threshold, the charge-sustaining mode including operating an internal combustion engine and an electric machine of the hybrid powertrain system to sustain the SOC of the energy storage device at or above the predetermined minimum SOC threshold; operating the hybrid powertrain system in the charge-depletion mode when the monitored SOC of the energy storage device is greater than the predetermined minimum SOC threshold; in response to an operator request for a HOLD+SOC strategy, determining if the SOC of the energy storage device is less than a predetermined HOLD+SOC maximum threshold associated with operating the hybrid powertrain system in an opportunity charging mode; if the SOC of the energy storage device is greater than the predetermined HOLD+SOC maximum threshold operating the hybrid powertrain system to maintain the SOC of the energy storage device; if the SOC of the energy storage device is less than the predetermined HOLD+SOC maximum threshold, iteratively determining whether operating conditions for operating the hybrid powertrain system in the opportunity charging mode have been met, said operating conditions having been met when an internal combustion engine of the hybrid powertrain system is operating at a desired efficiency and no operating faults are present;