Traction control system in a vehicle, vehicle including traction control system, and traction control method

A vehicle comprising a traction control system including:

• a detector for detecting a monitored value which changes according to a degree to which a drive wheel slips;
• a condition determiner for determining whether or not the monitored value detected by the detector meets a control start condition of traction control and whether or not the monitored value detected by the detector meets a control termination condition of the traction control;
• and
• a controller for executing the traction control to reduce a driving power of the drive wheel during a period of time from when the condition determiner determines that the monitored value meets the control start condition until the condition determiner determines that the monitored value meets the control termination condition;
• wherein the control start condition and the control termination condition are independently set;
• wherein the condition determiner being configured to set at least the control start condition variably based on a slip determination factor which changes according to a vehicle state;
• and
• wherein the slip determination factor includes a difference value between a current value and a past value of at least one of a throttle valve opening degree, an engine speed, and a slip ratio.

A traction control method comprising:

• detecting a monitored value which changes according to a degree to which a drive wheel slips;
• determining whether or not the monitored value detected in the detecting step meets a control start condition of fraction control and whether or not the monitored value detected in the detecting step meets a control termination condition of the fraction control;
• and
• executing the traction control to reduce a driving power of the drive wheel during a period of time from when it is determined that the monitored value meets the control start condition in the determination step until it is determined that the monitored value meets the control termination condition in the determination step;
• wherein the control start condition is a condition in which the monitored value is greater than or equal to a control start threshold, the control termination condition is a condition in which the monitored value is less than a control termination threshold, and the control start threshold and the control termination threshold are set according to formulas which are independent of each other;
• wherein in the determination step, each of the formula used for setting the control start threshold and the formula used for setting the control termination threshold is set variably based on a slip determination factor which changes according to a vehicle state;
• and
• the slip determination factor including a sensitive factor indicating a temporal difference value between instantaneous values of the vehicle state and an insensitive factor indicating an instantaneous value of the vehicle state or a temporal integration value of instantaneous values of the vehicle state.