| 摘要 |
PURPOSE: A correcting method for wheel speed of a traction control system is provided to control traction accurately based on the corrected wheel speed by correcting deviation of wheel speed in wearing a tire or lowering pneumatic pressure. CONSTITUTION: A wheel speed sensor detects wheel speed and outputs to a wheel speed correcting part, and the wheel speed correcting part sets the wheel speed and the reference wheel speed(S110). The wheel speed correcting part calculates the first state variable and the second state variable(S120), and decides which state variable is more than zero(S130). The state variable is set to zero in case of the first state variable or the second state variable to be more than zero(S140), and the first reference wheel speed and the second reference wheel speed are operated with the wheel speed correcting part(S150). The wheel speed correcting part calculates the first spin state variable and the second spin state variable(S160), and decides the first and second spin state variables to be more than the reference value(S170). The tire state variable is set in case of the spin state variables to be more than the reference value(S180), and reset in case of the spin state variables to be less than the reference value(S190). Deviation is calculated in spinning the wheel(S230), and correction of wheel speed is decided according to vehicle speed, the brake switch state variable, acceleration of the wheel and autocruise(S240). Traction is controlled precisely with correcting deviation of wheel speed.
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