Torque compensating device and method

1. A torque compensating device comprising:

a compensation torque amount calculator for calculating a compensation torque amount by performing band pass filtering on a frequency corresponding to a vehicle speed of a host vehicle;

an inverse compensation torque generator for generating an inverse compensation torque if it is determined that judder and shimmy of a steering wheel have occurred based on the compensation torque amount; and

a controller configured to control the generation of the inverse compensation torque to be stopped by determining to be a temporary kickback if the compensation torque amount is calculated to be less than or equal to a first reference value,

wherein the controller controls to maintain the generation of the inverse compensation torque if the compensation torque amount is calculated to be greater than or equal to a second reference value,

wherein the controller controls to maintain the generation of the inverse compensation torque if the compensation torque amount is calculated to be equal to or less than the first reference value after being calculated to be greater than or equal to the second reference value.

2. The torque compensating device of claim 1 , wherein the controller controls to stop the generation of the inverse compensation torque if the compensation torque amount is calculated to be equal to or less than the first reference value before being calculated to be greater than or equal to a second reference value.

3. The torque compensating device of claim 1 , wherein the inverse compensation torque generator generates the inverse compensation torque larger as the calculated compensation torque amount increases.

4. The torque compensating device of claim 1 , wherein the compensation torque amount calculator calculates the compensation torque amount at a predetermined vehicle speed, and the controller controls to maintain the generation of the inverse compensation torque if the compensation torque amount is calculated to be equal to or greater than the second reference value for a predetermined time.

5. A torque compensating method comprising:

calculating a compensation torque amount by performing band pass filtering on a frequency corresponding to a vehicle speed of a host vehicle;

generating an inverse compensation torque if it is determined that judder and shimmy of a steering wheel have occurred based on the compensation torque amount; and

controlling the generation of the inverse compensation torque to be stopped by determining to be a temporary kickback if the compensation torque amount is calculated to be less than or equal to a first reference value,

wherein controlling the generation of the inverse compensation torque comprises controlling to maintain the generation of the inverse compensation torque if the compensation torque amount is calculated to be greater than or equal to a second reference value,

wherein controlling the generation of the inverse compensation torque comprises controlling to maintain the generation of the inverse compensation torque if the compensation torque amount is calculated to be equal to or less than the first reference value after being calculated to be greater than or equal to the second reference value.

6. The torque compensating method of claim 5 , wherein controlling the generation of the inverse compensation torque comprises controlling to stop the generation of the inverse compensation torque if the compensation torque amount is calculated to be equal to or less than the first reference value before being calculated to be greater than or equal to a second reference value.

7. The torque compensating method of claim 5 , wherein generating an inverse compensation torque comprises generating the inverse compensation torque larger as the calculated compensation torque amount increases.

8. The torque compensating method of claim 5 , wherein calculating a compensation torque amount comprises calculating the compensation torque amount at a predetermined vehicle speed, and controlling the generation of the inverse compensation torque comprises controlling to maintain the generation of the inverse compensation torque if the compensation torque amount is calculated to be equal to or greater than the second reference value for a predetermined time.

9. The torque compensating device of claim 1 , wherein the inverse compensation torque generator generates the inverse compensation torque if the compensation torque amount is calculated to be greater than or equal to a preset torque amount more than a preset number of times during a preset period.

10. The torque compensating device of claim 1 , wherein the band pass filtering is performed on the frequency generated by a tire of the host vehicle.

11. The torque compensating device of claim 1 , wherein the controller controls to maintain the generation of the inverse compensation torque for a predetermined time and then stop the generation of the inverse compensation torque if the compensation torque amount is greater than or equal to the first reference value and less than the second reference value.

12. The torque compensating method of claim 5 , wherein generating the inverse compensation torque comprises generating the inverse compensation torque if the compensation torque amount is calculated to be greater than or equal to a preset torque amount more than a preset number of times during a preset period.

13. The torque compensating method of claim 5 , wherein the band pass filtering is performed on the frequency generated by a tire of the host vehicle.

14. The torque compensating method of claim 5 , wherein controlling the generation of the inverse compensation torque comprises controlling to maintain the generation of the inverse compensation torque for a predetermined time and then to stop the generation of the inverse compensation torque if the compensation torque amount is greater than or equal to the first reference value and less than the second reference value.