Apparatus and method of controlling brake of tractor

1. An apparatus for controlling a brake of a tractor towing a trailer, comprising:

a trailer sensor for sensing whether or not the trailer is mounted at the tractor;

an auxiliary brake driver for driving an auxiliary brake of the tractor;

a main brake driver for driving main brakes of the tractor and the trailer; and

a controller for setting a ratio of braking force of the auxiliary brake to a reference value with respect to a required braking force from a smart cruise control (SCC) system and allocating the remaining required braking force to the main brakes of the tractor and the trailer in the case in which the trailer sensor senses that the trailer is mounted at the tractor.

2. The apparatus for controlling a brake of a tractor according to claim 1 , wherein the trailer sensor senses whether or not a load is loaded in the trailer as well as whether or not the trailer is mounted at the tractor.

3. The apparatus for controlling a brake of a tractor according to claim 1 , wherein the auxiliary brake is a retarder.

4. A method of controlling a brake of a tractor towing a trailer, comprising:

a trailer sensor sensing whether or not the trailer is mounted at the tractor; and

a controller setting a ratio of braking force of an auxiliary brake of the tractor to a reference value with respect to a required braking force from an SCC system and allocating the remaining required braking force to main brakes of the tractor and the trailer in the case in which the trailer is mounted at the tractor.

5. The method of controlling a brake of a tractor according to claim 4 , wherein in the step of sensing whether or not the trailer is mounted at the tractor, it is sensed whether or not a load is loaded in the trailer as well as whether or not the trailer is mounted at the tractor.

6. The method of controlling a brake of a tractor according to claim 4 , wherein the auxiliary brake is a retarder.