Motor-driven drum brake system and method of controlling the same
Provided is motor-driven drum brake system including: a motor-driven drum brake including a brake shoe inside a drum and allowing the brake shoe to be pressed on an inner surface of the drum by hydraulic pressure of a wheel cylinder or an operation of a motor to perform braking; and a controller configured to control the motor to engage the motor-driven drum brake, wherein the controller is configured to, upon a total count of parking apply operations of the motor-driven drum brake being greater than a preset count when performing a parking apply operation, correct a target clamping force of the motor-driven drum brake and perform the parking apply operation according to the corrected target clamping force.
1. A motor-driven drum brake system comprising:
a motor-driven drum brake including a brake shoe inside a drum and allowing the brake shoe to be pressed on an inner surface of the drum by hydraulic pressure of a wheel cylinder or an operation of a motor to perform braking; and
a controller configured to control the motor to engage the motor-driven drum brake, and correct a target clamping force of the motor-driven drum brake based on a burnishing state of the brake shoe,
wherein the controller is configured to, upon a total count of parking apply operations of the motor-driven drum brake being greater than a preset count when performing a parking apply operation, correct the target clamping force of the motor-driven drum brake and perform the parking apply operation according to the corrected target clamping force.
2. The motor-driven drum brake system of claim 1 , wherein the controller is configured to store a parking apply count for the motor-driven drum brake in a memory whenever a parking apply operation is performed, and accumulate the parking apply count stored in the memory to recognize the total count of parking apply operations.
3. The motor-driven drum brake system of claim 1 , wherein the controller is configured to,
upon the total count of parking apply operations of the motor-driven drum brake being greater than the preset count and a total hydraulic amount of the motor-driven drum brake being greater than a preset hydraulic amount when performing the parking apply operation, reduce the target clamping force of the motor-driven drum brake.
4. The motor-driven drum brake system of claim 3 , wherein the controller is configured to store a hydraulic amount of the motor-driven drum brake in a memory whenever a parking apply operation and a braking operation are performed, and accumulate the hydraulic amount stored in the memory to recognize the total hydraulic amount of the motor-driven drum brake.
5. A method of controlling a motor-driven drum brake system, the method comprising:
controlling a motor-driven drum brake including a brake shoe inside a drum and allowing the brake shoe to be pressed on an inner surface of the drum by hydraulic pressure of a wheel cylinder or an operation of a motor to perform braking,
comparing a total count of parking apply operations of the motor-driven drum brake with a preset count when performing a parking apply operation;
correcting a target clamping force of the motor-driven drum brake based on a burnishing state of the brake shoe; and
performing the parking apply operation according to the corrected target clamping force,
wherein the correcting of the target clamping force is performed when a result of the comparison is that the total count of parking apply operations is greater than the preset count.
6. The method of claim 5 , wherein the correcting of the target clamping force is performed upon the total count of parking apply operations of the motor-driven drum brake being greater than the preset count and a total hydraulic amount of the motor-driven drum brake being greater than a preset hydraulic amount.
7. The method of claim 6 , further comprising:
accumulating a parking apply count stored in a memory whenever a parking apply operation is performed, to recognize the total count of parking apply operations; and
accumulating a hydraulic amount of the wheel cylinder stored in a memory whenever a parking apply operation and a braking operation are performed, to recognize the total hydraulic amount of the motor-driven drum brake.