Method and system for calculating distance to empty of eco-friendly vehicle

1. A method for calculating a distance to empty (DTE) of a vehicle, the method comprising:

determining, by a navigation device, a travel route along which the vehicle travels to an input destination;

estimating, by a cooling controller, cooling power consumption for cooling a battery based on travel information predicted for the travel route;

calculating, by a vehicle controller, the DTE based on the cooling power consumption;

determining, by the vehicle controller, whether the calculated DTE is less than a predetermined distance; and

when it is determined that the calculated DTE is less than the predetermined distance, setting a notification to charge the battery and automatically switch a traveling mode of the vehicle to an economical mode,

wherein estimating the cooling power consumption further comprises:

estimating, by the cooling controller, the cooling power consumption using a previously mapped cooling power consumption map that is determined experimentally by mapping the cooling power consumption according to an outside air temperature, an amount of solar radiation, and a discharge current of the battery; and

updating the previously mapped cooling power consumption map by cooling power consumption data based on actual travel.

2. The method of claim 1 , wherein estimating the cooling power consumption comprises:

determining, by the cooling controller, whether the battery is required to be cooled by predicting a temperature of the battery in each section of a plurality of sections into which the travel route is divided; and

estimating, by the cooling controller, the cooling power consumption in a section of the plurality of sections that the battery is required to be cooled.

3. The method of claim 2 , wherein determining whether the battery is required to be cooled comprises:

determining, by the cooling controller, a section of the plurality of sections that the temperature of the battery is equal to or higher than a predetermined cooling temperature as the section of the plurality of sections that the battery is required to be cooled, wherein the temperature of the battery is estimated based on an outside air temperature, an amount of solar radiation, and a predicted discharge current of the battery.

4. The method of claim 3 , wherein the predicted discharge current of the battery is predicted by reflecting real-time road information in the section of the plurality of sections into which the travel route is divided.

5. The method of claim 2 , wherein estimating the cooling power consumption comprises:

estimating, by the cooling controller, the cooling power consumption is based on the outside air temperature, the amount of solar radiation, and the predicted discharge current of the battery in the section of the plurality of sections that the battery is required to be cooled.

6. The method of claim 1 , wherein calculating the DTE comprises:

calculating, by the vehicle controller, the DTE based on driving power predicted for the travel route and the cooling power consumption.

7. The method of claim 6 , wherein calculating the DTE comprises:

calculating, by the vehicle controller, final energy consumption efficiency by reflecting the driving power predicted for the travel route and the cooling power consumption; and

calculating, by the vehicle controller, the DTE based on the final energy consumption efficiency and a state of charge of the battery.

8. The method of claim 6 , wherein calculating the DTE comprises:

calculating, by the vehicle controller, cooling energy consumption efficiency by subtracting the final energy consumption efficiency from driving energy consumption efficiency predicted for the travel route; and

calculating, by the vehicle controller, the DTE by subtracting a cooling distance corresponding to the cooling energy consumption efficiency from a driving distance corresponding to the driving energy consumption efficiency.

9. A system for calculating a distance to empty (DTE) of a vehicle, the system comprising:

a navigation device configured to determine a travel route along which the vehicle travels to a destination received from a user;

memory configured to store a previously mapped cooling power consumption map that is determined experimentally by mapping cooling power consumption according to an outside air temperature, an amount of solar radiation, and a discharge current of a battery to cool the battery;

a cooling controller configured to:

estimate the cooling power consumption for cooling the battery based on travel information predicted for the travel route;

estimate the cooling power consumption based on the outside air temperature, the amount of solar radiation, and the discharge current of the battery in a section of a plurality of sections that the battery is required to be cooled; and

update the previously mapped cooling power consumption map using cooling power consumption data based on actual travel; and

a vehicle controller configured to:

calculate the DTE based on the cooling power consumption;

determine whether the calculated DTE is less than a predetermined distance; and

when it is determined that the calculated DTE is less than the predetermined distance, set a notification to charge the battery and automatically switch a traveling mode of the vehicle to an economical mode.

10. The system of claim 9 , wherein the cooling controller is configured to:

determine whether the battery is required to be cooled by predicting a temperature of the battery in each section of a plurality of sections into which the travel route is divided; and

estimate the cooling power consumption in a section of the plurality of sections that the battery is required to be cooled.

11. The system of claim 10 , wherein the system further comprises:

a temperature sensor configured to measure an outside air temperature; and

a solar radiation sensor configured to measure an amount of solar radiation,

wherein the cooling controller is configured to determine a section of the plurality of sections that the temperature of the battery is equal to or higher than a predetermined cooling temperature as the section of the plurality of sections that the battery is required to be cooled, and wherein the temperature of the battery is estimated based on the outside air temperature, the amount of solar radiation, and a predicted discharge current of the battery.

12. The system of claim 9 , wherein the vehicle controller is configured to calculate the DTE based on driving power predicted for the travel route and the cooling power consumption.