Apparatus and method for failsafe in electric corner module system

1. A fail-safe apparatus of an electric corner module (ECM) system, comprising:

a pressure sensor configured to sense a pressure of a brake booster of a vehicle;

a pedal stroke sensor configured to sense an angle of a brake pedal of the vehicle;

a motor configured to drive a wheel of the vehicle;

a pedal displacement calculator configured to calculate a displacement of the brake pedal when the pressure of the brake booster sensed by the pressure sensor is less than a reference pressure; and

a reverse torque calculator configured to calculate a reverse torque for driving the motor to provide a braking force to the wheel on the basis of the displacement of the brake pedal and a maximum torque according to a revolutions per minute (RPM) of the motor.

2. The fail-safe apparatus of claim 1 , wherein the pedal displacement calculator comprises:

a maximum displacement calculator configured to calculate a maximum displacement of the brake pedal according to the sensed pressure of the brake booster; and

a current displacement calculator configured to calculate a current displacement of the brake pedal according to the angle sensed by the pedal stroke sensor.

3. The fail-safe apparatus of claim 1 , further comprising a comparator configured to compare the pressure of the brake booster sensed by the pressure sensor with the reference pressure.

4. The fail-safe apparatus of claim 1 , wherein motors are provided only at each of front wheels or rear wheels.

5. The fail-safe apparatus of claim 1 , wherein motors are provided at all of front wheels or rear wheels.

6. The fail-safe apparatus of claim 1 , further comprising a distributor configured to distribute a driving force of the motor and transfer the driving force to each of both wheels of front wheels and rear wheels.

7. The fail-safe apparatus of claim 1 , further comprising an individual wheel reverse torque calculator configured to calculate an individual wheel reverse torque for independently driving each of a plurality of motors installed for each of the wheels on the basis of the reverse torque calculated by the reverse torque calculator when the plurality of motors are provided at the wheels.

8. The fail-safe apparatus of claim 7 , wherein the individual wheel reverse torque calculator calculates the individual wheel reverse torque with a ratio according to a front wheel and rear wheel distribution logic.

9. The fail-safe apparatus of claim 7 , wherein the individual wheel reverse torque calculator calculates the individual wheel reverse torque according to a running stability logic including electronic stability control (ESC).

10. The fail-safe apparatus of claim 1 , wherein the reverse torque calculator calculates a reverse torque T according to a following equation,

T=B/A×C,

wherein A refers to a maximum displacement of the brake pedal according to the sensed pressure of the brake booster, B refers to a sensed current displacement of the brake pedal, and C refers to the maximum torque according to the RPM of the motor.

11. A fail-safe method of an ECM system, comprising:

comparing a pressure of a brake booster sensed by a pressure sensor with a reference pressure;

calculating a displacement of a brake pedal when the sensed pressure of the brake pedal is less than the reference pressure;

calculating a reverse torque for driving a motor configured to drive a wheel of a vehicle on the basis of the displacement of the brake pedal and a maximum torque of the motor; and

driving the motor according to the calculated reverse torque to provide a braking force to the wheel.

12. The fail-safe method of claim 11 , wherein the calculating of the displacement comprises:

calculating a maximum displacement of the brake pedal of the vehicle according to the pressure of the brake pedal; and

calculating a current displacement of the brake pedal according to an angle sensed by a pedal stroke sensor.

13. The fail-safe method of claim 11 , wherein the driving comprises driving motors provided only at each of front wheels or rear wheels.

14. The fail-safe method of claim 11 , wherein the driving comprises driving motors provided at all front wheels or rear wheels.

15. The fail-safe method of claim 11 , wherein the driving comprises distributing a driving force of the motor and transferring the driving force to each of both wheels of front wheels or rear wheels.

16. The fail-safe method of claim 11 , wherein the driving comprises calculating an individual wheel reverse torque for independently driving each of a plurality of motors installed for each of the wheels on the basis of the reverse torque calculated in the calculating of reverse torque when the plurality of motors are provided at the wheels.

17. The fail-safe method of claim 16 , wherein the calculating of the individual wheel reverse torque comprises calculating the individual wheel reverse torque with a ratio according to a front wheel and rear wheel distribution logic.

18. The fail-safe method of claim 16 , wherein the calculating of the individual wheel reverse torque comprises calculating the individual wheel reverse torque according to a running stability logic including ESC.

19. The fail-safe method of claim 11 , wherein the calculating of the reverse torque comprises calculating a reverse torque T according to a following equation,

T=B/A×C,

wherein A refers to a maximum displacement of the brake pedal according to the sensed pressure of the brake booster, B refers to a sensed current displacement of the brake pedal, and C refers to the maximum torque according to the RPM of the motor.