Trunk door opening/closing assistance apparatus and method

1. A trunk door opening/closing assistance apparatus for a vehicle comprising:

a torque detection part adapted to detect a torque applied by a user in response to the user manually opening or closing the trunk door of the vehicle;

a control unit adapted to provide assist torque support in addition to the torque applied by the user within a total torque range required to open or close the trunk door in response to the user manually opening or closing the trunk door; and

a motor drive part adapted to drive a motor for assisting the opening or closing the trunk door with a direction and a strength which are controlled by the control unit.

2. The trunk door opening/closing assistance apparatus as claimed in claim 1 , wherein the control unit provides support for an assist torque which is a remainder of subtracting a manual force applied by the user from the total torque required to open or close the trunk door.

3. The trunk door opening/closing assistance apparatus as claimed in claim 1 , wherein the torque detection part is further adapted to detect a direction and a strength of the torque applied by the user, and

the direction of the torque input by the user is either a direction of opening the trunk door or a direction of closing the trunk door.

4. The trunk door opening/closing assistance apparatus as claimed in claim 1 , further comprising:

an angle detection part adapted to detect an angle of the trunk door opened or closed by the user; and

a user height detection part comprising at least one sensor installed on the trunk door adapted to detect a height of the user who opens or closes the trunk door, wherein

in response to the height of the user being detected, the control unit sets a maximum open angle of the trunk door corresponding to the height of the user, and when the user opens the trunk door, the control unit stops to provide support for the assist torque after the open angle of the trunk door reaches the set maximum open angle of the trunk door.

5. The trunk door opening/closing assistance apparatus as claimed in claim 4 , wherein the angle detection part detects the angle of the trunk door between a maximum closed angle when the trunk door is in a lock state, and a maximum open angle when the trunk door is in an open state.

6. The trunk door opening/closing assistance apparatus as claimed in claim 4 , wherein in response to the trunk door being opened, the user height detection part detects, by the at least one sensor installed on the trunk door, a height up to the top of the head of the user or a height up to an end of an upwardly stretched hand of the user.

7. A trunk door opening/closing assistance method comprising:

detecting a torque applied by a user to in response to the user manually opening or closing a trunk door of a vehicle;

providing, by a control unit, an assist torque support in addition to the torque applied by the user within a total torque range required to open or close the door in response to the user manually opening or closing the trunk door; and

driving a motor, by a motor drive part, for assisting the opening or closing of the trunk door according to a direction and a strength which are controlled by the control unit.

8. The trunk door opening/closing assistance method of claim 7 , wherein the assist torque provided by the control unit is a remainder of subtracting a manual force applied by the user from the total torque required to open or close the trunk door.

9. The trunk door opening/closing assistance method as claimed in claim 7 , further comprising:

detecting, by an angle detection part, an angle of the trunk door opened or closed by the user when the user manually opens or closes the trunk door; and

detecting, by a user height detection part, a height of the user who opens or closes the trunk door, wherein

in response to the height of the user being detected, the control unit sets a maximum open angle of the trunk door corresponding to the height of the user, and when the user opens the trunk door, the control unit stops to provide the support for the assist torque after the open angle of the trunk door reaches the set maximum open angle of the opened trunk door.

10. The trunk door opening/closing assistance method as claimed in claim 9 , wherein the angle detection part detects the angle of the trunk door opened or closed between a maximum closed angle when the trunk door is in a lock state and a maximum open angle when the trunk door is in an open state.

11. The trunk door opening/closing assistance method as claimed in claim 9 , wherein when the trunk door is opened, the user height detection part detects, by at least one sensor installed on the trunk door, a height up to the top of the head of the user or a height up to an end of an upwardly stretched hand of the user.

12. The trunk door opening/closing assistance method as claimed in claim 7 , wherein when a torque is not applied by the user while the trunk door is opened and closed by providing the assist torque support, the control unit stops the support for the assist torque to stop the opening or closing of the trunk door.

13. The trunk door opening/closing assistance method as claimed in claim 7 , wherein when the support for the assist torque is provided to open and close the trunk door,

the control unit detects the height of the user who opens and closes the trunk door, and sets a maximum open angle of the trunk door corresponding to the height of the user;

in response to the trunk door being opened by the user, the control unit sets, by the assist torque, a total torque for opening the trunk door up to a maximum angle after the set trunk door maximum open angle is reached and thereby automatically opens the trunk door up to a maximum angle; and

when the user intends to close the trunk door, the control unit automatically closes the trunk door opened up to the maximum open angle set by taking into account the height of the user.

14. The trunk door opening/closing assistance method as claimed in claim 13 , wherein the control unit determines a case of closing the trunk door by the user by detecting at least one of the user's input of a trunk button in a vehicle remote controller, the user's touch of a specific position in the trunk, and an elapse of a specific time after the trunk is opened up to the maximum open angle.