Device and method for preventing driving under influence

1. A device for preventing driving under influence, the device including:

a first measuring device configured for detecting alcohol in indoor air of a vehicle; and

a processor connected to the first measuring device,

wherein the processor is configured to:

perform a first check of checking a presence or an absence of the alcohol in the indoor air through the first measuring device before a driver boards the vehicle;

perform a second check of checking the presence or the absence of the alcohol in the indoor air through the first measuring device after the driver boards the vehicle; and

determine whether there is a possibility that the driver is drunken according to results of performing the first check and the second check.

2. The device of claim 1 , wherein the first measuring device includes:

a simplified alcohol sensor of detecting an alcohol component in the indoor air; and

an olfactory sensor of detecting an alcohol odor in the indoor air.

3. The device of claim 2 , wherein the processor is configured to determine whether there is the possibility that the driver is drunken according to whether the alcohol component and the alcohol odor are detected in the first check and the second check.

4. The device of claim 3 , wherein the processor is configured to wait for a predetermined time period and then re-perform the second check upon determining that there is the possibility that the driver is drunken.

5. The device of claim 4 , wherein the predetermined time period is defined as a time required for the alcohol to evaporate and disappear.

6. The device of claim 3 , further including:

a second measuring device connected to the processor and configured for measuring an alcohol level of the driver,

wherein the processor is configured to measure a blood alcohol concentration from breath of the driver using the second measuring device upon determining that there is the possibility that the driver is drunken.

7. The device of claim 6 , wherein the processor is configured to:

restrict start of the vehicle upon determining that the blood alcohol concentration is equal to or above a threshold value; and

allow the start of the vehicle upon determining that the blood alcohol concentration is below the threshold value.

8. The device of claim 3 , wherein the processor is configured to allow start of the vehicle upon determining that there is no possibility that the driver is drunken.

9. The device of claim 6 , wherein the first measuring device is formed as a single module with the second measuring device.

10. The device of claim 1 , wherein the processor is configured to output a guide message indicating that the second check is being performed on an output device connected to the processor.

11. A method of preventing driving under influence, the method comprising:

performing, by a processor, a first check of checking a presence or an absence of alcohol in indoor air of a vehicle before a driver boards the vehicle;

performing, by the processor, a second check of checking the presence or the absence of the alcohol in the indoor air after the driver boards the vehicle;

determining, by the processor, whether there is a possibility that the driver is drunken according to results of performing the first check and the second check;

performing, by the processor, a blood alcohol level measurement of the driver upon determining that there is the possibility that the driver is drunken; and

restricting, by the processor, start of the vehicle according to a result of the blood alcohol level measurement.

12. The method of claim 11 , wherein the performing of the first check includes:

detecting that a driver's seat door of the vehicle is unlocked; and

detecting an alcohol component and an alcohol odor in the indoor air using a simplified alcohol sensor and an olfactory sensor disposed in the vehicle.

13. The method of claim 11 , wherein the performing of the second check includes:

detecting that a status of a driver's seat door of the vehicle is switched from an opened status to a closed status;

receiving a command instructing start of the vehicle; and

detecting an alcohol component and an alcohol odor in the indoor air using a simplified alcohol sensor and an olfactory sensor disposed in the vehicle.

14. The method of claim 11 , further including:

measuring, by the processor, a blood alcohol concentration from breath of the driver using a blood alcohol level measuring sensor upon determining that there is the possibility that the driver is drunken.

15. The method of claim 14 , further including:

concluding, by the processor, that the start of the vehicle is not available upon determining that the measured blood alcohol concentration is equal to or above a predetermined threshold value.

16. The method of claim 14 , further including:

allowing, by the processor, the start of the vehicle upon determining that the measured blood alcohol concentration is below a predetermined threshold value.

17. The method of claim 11 , further including:

allowing, by the processor, the start of the vehicle upon determining that there is not possibility that the driver is drunken.

18. The method of claim 11 , further including:

waiting, by the processor, for a predetermined time period and then re-performing the second check upon determining that there is the possibility that the driver is drunken.

19. The method of claim 18 , wherein the predetermined time period is defined as a time required for the alcohol to evaporate and disappear.

20. The method of claim 11 , wherein the performing of the second check further includes

outputting, by the processor, a guide message indicating that the presence or the absence of the alcohol in the indoor air is being checked on an output device connected to the processor.