Patent ID: 7130732

Claim:
A method for preventing a rotary speed decrease of a motor when engaging a converter clutch of a torque converter during constant gas pedal positioning in a continuously variable transmission with a variator and a hydrodynamic converter, and avoiding a motor rotary speed decrease by an increase in a speed of rotation of a primary disk of the variator, the method comprising the steps of: activating a waiting phase, determining and storing, during a determine a difference in rotational speeds phase where an engaging procedure starts, a difference n diff between a motor speed of rotation n mot and the speed of rotation n t of the primary disc (second phase), increasing, during an increase phase, the speed of rotation of the primary disk of the variator by an offset, which corresponds to a calibrated percentile portion of the speed of rotation difference n diff at a beginning of the engaging procedure (third phase), holding, during a holding phase, the offset constant up to the point in time at which a driver removes an input of gas, and diminishing, during an offset decrease phase, the offset with a speed of the diminishment of the offset being determined by a speed by which the driver lessens the input of the gas, in dependency of a gas pedal positioning when compared to the gas pedal positioning at an end of a fourth phase (this being the fifth phase), and diminishing the offset to zero when the converter clutch, during at least one of a third phase, the fourth phase and a fifth phase is disengaged.