Traction control system and control method thereof
Disclosed herein are a traction control system and a control method thereof. The traction control system includes a communicator configured to receive acceleration of a vehicle; and a controller configured to decrease output torque in response to a decrease of the received vehicle acceleration, wherein the controller outputs second torque smaller than first torque corresponding to the decreased vehicle acceleration and then increases the second torque to the first torque during a predetermined first threshold time when the controller determines that the vehicle is traveling on a low-friction road surface into which a high-friction road surface changed on the basis of the vehicle acceleration.
1. A traction control system for controlling engine torque at a time of occurrence of wheel spin, the traction control system comprising:
a controller configured to
receive acceleration of a vehicle, and
when a vehicle acceleration exceeds a first acceleration threshold and then the vehicle acceleration decreases to a level lower than a second acceleration threshold smaller than the first acceleration threshold, output a second engine torque smaller than a first engine torque corresponding to the decreased vehicle acceleration, and then increase the second engine torque to the first engine torque during a predetermined first threshold time.
2. The traction control system of claim 1 , wherein when the vehicle acceleration is maintained at a level higher than the first acceleration threshold for a predetermined time period, the controller determines that the vehicle is traveling on a high-friction road surface, and when the vehicle acceleration decreases to a level lower than the second acceleration threshold smaller than the first acceleration threshold, the controller determines that the vehicle is traveling on a low-friction road surface into which the high-friction road surface changed.
3. The traction control system of claim 2 , wherein the second engine torque is calculated with a maximum gain.
4. A traction control system for controlling engine torque at a time of occurrence of wheel spin, the traction control system comprising:
a controller configured to
receive acceleration of a vehicle,
determine whether a road changes from a high-friction surface road to a low-friction surface road on the basis of a change in the received acceleration of the vehicle,
determine whether a spin of driven wheels is greater than a predetermined spin threshold when the road changes from the high-friction surface road to the low-friction surface road, and
perform engine torque decrease control to decrease an engine torque when the spin of the driven wheels is greater than the predetermined spin threshold.
5. The traction control system of claim 4 , wherein the controller determines that the road changes from the high-friction surface road to the low-friction surface road when the received acceleration of the vehicle changes from a first threshold acceleration corresponding to the high-friction road surface to a second threshold acceleration corresponding to the low-friction road surface.
6. The traction control system of claim 4 , wherein the controller calculates a proportional gain (P gain) and an integral gain (I gain) of a proportional-integral (PI) control used to calculate an amount by which the engine torque is decreased when the spin of the driven wheels is larger than the predetermined spin threshold, and applies the calculated P gain and I gain to perform the engine torque decrease control.
7. The traction control system of claim 6 , wherein the controller calculates the P gain and the I gain according to the following Equation 1 and the following Equation 2, respectively:
Final K P =Reference K P *P factor <Equation 1>
Final K I =Reference K I *I factor <Equation 2>
where Final K P indicates a final gain value to be applied during a P control, Reference K P indicates a reference gain value during the P control, P factor indicates a calibration parameter during the P control, Final K I indicates a final gain value to be applied during an I control, Reference K I indicates a reference gain value during the I control, and I factor indicates a calibration parameter during the I control.
8. The traction control system of claim 7 , wherein a maximum value is assigned to the P factor so that the maximum value is assigned to a gain value when the road changes from the high-friction surface road to the low-friction surface road, and as time passes, 100% is assigned to the P factor at a final time by decreasing the gain value.
9. The traction control system of claim 7 , wherein a maximum value is assigned to the I factor so that the maximum value is assigned to a gain value when the road changes from the high-friction surface road to the low-friction surface road, and as time passes, 100% is assigned to the I factor at a final time by decreasing the gain value.
10. A traction control method for controlling engine torque at a time of occurrence of wheel spin, the traction control method comprising:
receiving acceleration of a vehicle;
determining whether a road changes from a high-friction road surface to a low-friction road surface on the basis of a change in the received vehicle acceleration;
determining whether spin of driven wheels is greater than a predetermined spin threshold when the road changes from the high-friction road surface to the low-friction road surface; and
performing engine torque decrease control to decrease the engine torque when the spin of the driven wheels is greater than the predetermined spin threshold.
11. The traction control method of claim 10 , the engine torque decrease control includes calculating a proportional gain (P gain) and an integral gain (I gain) of a proportional-integral (PI) control used to calculate an amount by which the engine torque is decreased when the spin of the driven wheels is larger than the predetermined spin threshold, and applying the calculated P gain and I gain to perform the engine torque decrease control.