Method for determining optimal operation point with respect to state of charge in hybrid electric vehicle
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorYong Gi Kim
Life of this patent
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Abstract
The present invention provides a method for determining an optimal operation point with respect to SOC in a hybrid electric vehicle, in which, as a conversion factor (fuel equivalent factor) that can quantitatively compare the amount of fuel consumed by an engine with electrical energy consumed by a motor, a factor for obtaining a desired final SOC with respect to an initial SOC is determined, and an optimal operation state based on a current SOC of the hybrid electric vehicle is determined using the factor, thus improving fuel efficiency of the hybrid electric vehicle.
Claims4
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.
Dependencies are inferred from the claim text.