Steering control device and method

1. A steering control device controlling a reaction force motor to generate a reaction torque in response to rotation of a steering wheel, the steering control device comprising:

a condition determiner determining whether a stop reaction force providing condition is met, the stop reaction force providing condition including a preset vehicle stop condition and reaction force provision preparation condition;

a producer discerning and processing a scheme for producing stop reaction torque information based on remaining power information regarding a remaining power amount of a battery supplying power to the reaction force motor upon determining that the stop reaction force providing condition is met; and

a controller controlling to generate a reaction torque to the steering wheel based on the stop reaction torque information.

2. The steering control device of claim 1 , wherein the vehicle stop condition is set as a condition meeting at least one of a condition where an ignition off of a vehicle is complete, a condition where a power off of the steering device is complete, or a condition where velocity information about the vehicle is determined to be less than a preset reference velocity, and the reaction force provision preparation condition is set as a condition meeting at least one of a condition where steering torque information is determined to be a reference torque or more, a condition where a car key is recognized as being inserted in the vehicle, a condition where a door of the vehicle is recognized as open, or a condition where a person is recognized as being in the vehicle, and

wherein the condition determiner determines that the stop reaction force providing condition is met when both the vehicle stop condition and the reaction force provision preparation condition are met.

3. The steering control device of claim 1 , wherein if the remaining power information is determined to be a preset reference power amount or more, the producer produces steering angle displacement information based on steering angular velocity information and produces the stop reaction torque information so that a magnitude of the stop reaction torque information increases as a magnitude of the steering angle displacement information increases, and

wherein if the steering angle displacement information is a preset reference steering angle displacement or more, the producer produces a preset maximum reaction torque as the stop reaction torque information.

4. The steering control device of claim 3 , wherein the producer produces the stop reaction torque information based on preset lookup table information according to the steering angle displacement information, and

wherein the lookup table information is set in such a format in which a stop reaction torque value corresponding to each steering angle displacement value is stored with each steering angle displacement value used as an index.

5. The steering control device of claim 3 , wherein if the remaining power information is the reference power amount or more and is less than a preset second reference power amount, the producer reduces a setting value of the maximum reaction torque based on the remaining power information.

6. The steering control device of claim 1 , wherein if the remaining power information is determined to be less than a preset reference power amount, the producer produces the stop reaction torque information based on a preset motor braking torque.

7. The steering control device of claim 6 , wherein the motor braking torque includes information regarding a torque generated when braking the reaction force motor by controlling a switching element of an inverter connected to the reaction force motor to short a motor coil.

8. The steering control device of claim 1 , wherein if the remaining power information is determined to be a preset reference power amount or more so that the stop reaction torque information is produced, the controller controls to drive the reaction force motor to generate a torque corresponding to the stop reaction torque information.

9. The steering control device of claim 1 , wherein if the remaining power information is determined to be less than a preset reference power amount so that the stop reaction torque information is produced, the controller controls a switching element of an inverter to short a motor coil of the reaction force motor.

10. A steering control method controlling a reaction force motor to generate a reaction torque in response to rotation of a steering wheel, the steering control method comprising:

a condition determination step determining whether a stop reaction force providing condition is met, the stop reaction force providing condition including a preset vehicle stop condition and reaction force provision preparation condition;

an information production step discerning and processing a scheme for producing stop reaction torque information based on remaining power information regarding a remaining power amount of a battery supplying power to the reaction force motor upon determining that the stop reaction force providing condition is met; and

a stop reaction force control step controlling to generate a stop reaction torque to the steering wheel based on the stop reaction torque information.

11. The steering control method of claim 10 , wherein the vehicle stop condition is set as a condition meeting at least one of a condition where an ignition off of a vehicle is complete, a condition where a power off of the steering device is complete, or a condition where velocity information about the vehicle is determined to be less than a preset reference velocity, and the reaction force provision preparation condition is set as a condition meeting at least one of a condition where steering torque information is determined to be a reference torque or more, a condition where a car key is recognized as being inserted in the vehicle, a condition where a door of the vehicle is recognized as open, or a condition where a person is recognized as being in the vehicle, and

wherein the condition determination step determines that the stop reaction force providing condition is met when both the vehicle stop condition and the reaction force provision preparation condition are met.

12. The steering control method of claim 10 , wherein if the remaining power information is determined to be a preset reference power amount or more, the information production step produces steering angle displacement information based on steering angular velocity information and produces the stop reaction torque information so that a magnitude of the stop reaction torque information increases as a magnitude of the steering angle displacement information increases, and

wherein if the steering angle displacement information is a preset reference steering angle displacement or more, the information production step produces a preset maximum reaction torque as the stop reaction torque information.

13. The steering control method of claim 10 , wherein if the remaining power information is determined to be less than a preset reference power amount, the information production step produces the stop reaction torque information based on a preset motor braking torque.

14. The steering control method of claim 10 , wherein if the remaining power information is determined to be a preset reference power amount or more so that the stop reaction torque information is produced, the stop reaction force control step controls to drive the reaction force motor to generate a torque corresponding to the stop reaction torque information.

15. The steering control method of claim 10 , wherein if the remaining power information is determined to be less than a preset reference power amount so that the stop reaction torque information is produced, the stop reaction force control step controls a switching element of an inverter to short a motor coil of the reaction force motor.