Patent ID: 8046125
Filing Date: 2011-10-25
Classification: B60W,Y02T,Y10S

Abstract:
1. A method for determining an optimal operation point with respect to state of charge (SOC) of an engine in a hybrid electric vehicle, the method comprising: receiving a driver demand; determining a current operation state by detecting a current vehicle speed, a driver demand power, and a current SOC; determining a class of SOC associated with the hybrid electric vehicle based on the current operation state; determining, from a map in which a whole operable range of the engine is arranged, a plurality of candidate engine operation points and a plurality of motor operation points corresponding to the respective candidate points according to the determined class of SOC; calculating operation costs for the plurality of candidate engine operation points and the corresponding motor operation points; determining an optimal operation point at which the engine and the motor can operate at the lowest cost; and applying an output command to the engine and the motor based on the determined optimal operation point.