Dry type torque converter for electric vehicle and controlling method thereof

A control method of a dry type of torque converter for an electric vehicle, comprising,

• in a planetary gear having a first element connected to an input shaft, a second element connected to an output shaft, a third element variably connected to a fixing unit, and a speed ratio by a predetermined gear ratio:
• a first step of multiplying a torque output to the second element by fixing and controlling the third element by operation control of a one-way clutch provided between the third element and the fixing unit in a speed ratio by the gear ratio;
• a second step transmitting a torque output to the second element by transmitting power as an eddy current torque generated by an eddy current to the first element and the second element by operation control of an eddy current torque generation unit provided between the first element and the second element above the speed ratio by the gear ratio depending on a speed increase of the output shaft;
• and
• a third step of directly connecting the input shaft and the output shaft by directly connecting the first and second elements while respectively being in contact with the inner surfaces of a front cover and a back cover in an axis direction by operation control of a lock-up mechanism provided on the second element depending on a speed increase of the output shaft above the speed ratio by the gear ratio and interlocked with the eddy current torque generation unit.