Device and method for calculating distance to empty of electric vehicle
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsIl Cho, Ki Taek Sung, Woo Sung Kim, Do Sung Hwang
Life of this patent
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Abstract
The prevent invention provides a device and a method for calculating a distance to empty of an electric vehicle which can reduce an initial error in estimating a distance to empty of an electric vehicle. The device and the method for calculating a distance to empty of an electric vehicle can provide more accurate DTE information from the start to the end of traveling by reducing the earlier error, in estimating the DTE from the amount of the presently remaining fuel (the amount of remaining capacity of a battery) of the electric vehicle.
Claims7
A computer, comprising:
- a memory configured to store one or more program instructions;
- and
- a processor configured to execute the one or more program instructions stored on the memory, wherein the one or more program instructions are configured to:
- calculate a learned fuel efficiency before an electric vehicle travels or a battery is charged;
- calculate the real-time accumulated traveling fuel efficiency;
- apply a first gain to the learned fuel efficiency and a second gain to the real-time accumulated traveling fuel efficiency, the first gain and the second gain changing over time based on a state of charge (SOC) of the battery;
- and
- output a distance to empty by adding the learned fuel efficiency with the first gain applied and the real-time accumulated traveling fuel efficiency with the second gain applied together, wherein a result of combining the first and second gains is 1 in such a manner that the first gain decreases every time the SOC of the battery changes by 1%.
A method for calculating a distance to empty of an electric vehicle, comprising:
- calculating, by a computer, a learned fuel efficiency before an electric vehicle travels or a battery is charged;
- calculating, by the computer, real-time accumulated traveling fuel efficiency;
- applying, by the computer, a first gain to the learned fuel efficiency and a second gain to the real-time accumulated traveling fuel efficiency, the first gain and the second gain changing over time based on a state of charge (SOC) of the battery;
- and
- outputting, by the computer, a distance to empty by combining the learned fuel efficiency with the first gain applied and the real-time accumulated traveling fuel efficiency with the second gain applied together, wherein a result of combining the first and second gains is 1 in such a manner that the first gain decreases every time the SOC of the battery changes by 1%.
Dependencies are inferred from the claim text.