Vehicle smart key system and control method thereof

1. A vehicle smart key system comprising:

a smart key in possession of a user of a vehicle; and

a smart key control device mounted on the vehicle to recognize a position of the smart key through wireless communication with the smart key, i) to activate, based on the position of the smart key, vehicle functions stepwisely and ii) to determine when to assign a vehicle access right to the smart key,

wherein the position of the smart key comprises a first zone and a second zone, both zones defined as distance regions within a predetermined radius range from the vehicle, such that the second zone is further from the first zone, and the first zone and the second zone are different, and

wherein the smart key control device sets the vehicle functions in association with user profile information before the user rides in the vehicle, and instructs the smart key to output a warning for abnormality in a vehicle state, upon determining that the user gets off the vehicle without recognizing the abnormality in the vehicle state and is located at the second zone; such that when the user is approaching the vehicle leaving the second zone and enters the first zone, intensity of the warning changes so that the user recognizes the abnormality in the vehicle state based on the changed intensity.

2. The vehicle smart key system of claim 1 , wherein the smart key control device activates a first vehicle function among the vehicle functions and provides information of the vehicle state to the smart key in a response that the smart key is positioned in the first zone.

3. The vehicle smart key system of claim 2 , wherein the first vehicle function is defined as a multimedia-system function.

4. The vehicle smart key system of claim 3 , wherein the smart key displays the information of the vehicle state provided from the smart key control device on a display device.

5. The vehicle smart key system of claim 2 , wherein the smart key control device activates a second vehicle function among the vehicle functions and assigns the vehicle access right to the smart key in a response that the smart key is positioned in the second zone.

6. The vehicle smart key system of claim 5 , wherein the second vehicle function is defined as a driving-system function.

7. The vehicle smart key system of claim 5 , wherein the smart key displays a user interface for vehicle control on a display device in a response that the vehicle access right is assigned.

8. The vehicle smart key system of claim 2 , wherein the smart key control device switches a vehicle door to a locked state in a response that the smart key is out of the first zone.

9. A smart key control device mounted on a vehicle, the smart key control device comprising:

a wireless communicator configured to perform wireless communication with a smart key in possession of a user of the vehicle; and

a processor configured to recognize a position of the smart key through the wireless communication with the smart key, i) to activate, based on the position of the smart key, vehicle functions stepwisely and ii) to determine when to assign a vehicle access right to the smart key,

wherein the position of the smart key comprises a first zone and a second zone, both zones defined as distance regions within a predetermined radius range from the vehicle, such that the second zone is further from the first zone, and the first zone and the second zone are different, and

wherein the processor sets the vehicle functions in association with user profile information before the user rides in the vehicle, and instructs the smart key to output a warning for abnormality in a vehicle state, upon determining that the user gets off the vehicle without recognizing the abnormality in the vehicle state and is located at the second zone; such that when the user is approaching the vehicle leaving the second zone and enters the first zone, intensity of the warning changes so that the user recognizes the abnormality in the vehicle state based on the changed intensity.

10. A control method of a vehicle smart key system including a smart key in possession of a user of a vehicle and a smart key control device mounted on the vehicle, the control method comprising:

a first step of recognizing, by the smart key control device, a position of the smart key; and

a second step of i) activating, by the smart key control device, based on the position of the smart key, vehicle functions stepwisely, and ii) determining, by the smart key control device, when to assign a vehicle access right to the smart key,

wherein the position of the smart key comprises a first zone and a second zone, both zones defined as distance regions within a predetermined radius range from the vehicle, such that the second zone is further from the first zone, and the first zone and the second zone are different, and

wherein the smart key control device sets the vehicle functions in association with user profile information before the user rides in the vehicle, and instructs the smart key to output a warning for abnormality in a vehicle state, upon determining that the user gets off the vehicle without recognizing the abnormality in the vehicle state and is located at the second zone; such that when the user is approaching the vehicle leaving the second zone and enters the first zone, intensity of the warning changes so that the user recognizes the abnormality in the vehicle state based on the changed intensity.

11. The control method of claim 10 , wherein the first step includes:

detecting the smart key; and

determining when authentication for the smart key is successful.

12. The control method of claim 10 , wherein the second step includes:

determining when the smart key is positioned in the first zone; and

activating a first vehicle function among the vehicle functions and providing vehicle state information to the smart key in a response that the smart key is positioned in the first zone.

13. The control method of claim 12 , wherein the second step includes:

determining when the smart key is positioned in the second zone while the smart key is not positioned in the first zone; and

activating a second vehicle function among the vehicle functions and assigning the vehicle access right to the smart key in a response that the smart key is positioned in the second zone.

14. The control method of claim 13 , wherein the second vehicle function is defined as a driving-system function.

15. The control method of claim 12 , wherein the first vehicle function is defined as a multimedia-system function.