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A method of controlling a powertrain for a hybrid vehicle, the method including providing an internal combustion engine, providing a motor generator operatively coupled to the internal combustion engine, providing an automatic transmission operatively coupled to the internal combustion engine, and a

A method of controlling a powertrain for a hybrid vehicle, the method including providing an internal combustion engine, providing a motor generator operatively coupled to the internal combustion engine, providing an automatic transmission operatively coupled to the internal combustion engine, and actuating the motor generator to a certain speed to restart the vehicle.

대표청구항 ▼

A method of controlling a powertrain for a hybrid vehicle, the method including providing an internal combustion engine, providing a motor generator operatively coupled to the internal combustion engine, providing an automatic transmission operatively coupled to the internal combustion engine, and a

A method of controlling a powertrain for a hybrid vehicle, the method including providing an internal combustion engine, providing a motor generator operatively coupled to the internal combustion engine, providing an automatic transmission operatively coupled to the internal combustion engine, and actuating the motor generator to a certain speed to restart the vehicle. input part constituting said differential part, wherein a rotational force of said speed change input part is transmitted into both said first differential input part and said hydraulic pump; a second differential input part constituting said differential part, said second differential input part receiving a rotational force of said hydraulic motor; a first drive train constituting said mechanical speed change mechanism from said hydraulic motor to said second differential input part; a second drive train constituting said mechanical speed change mechanism for transmitting a rotation of said group of planetary gears generated by a difference in rotation between said first differential input part and said second differential input part to said speed output part; and a third drive train constituting said mechanical speed change mechanism for transmitting a rotation of said hydraulic motor to said speed change output part without passing said differential part, wherein a transmission mode of said continuously variable transmission is selectively placed into either a first transmission mode for transmitting the rotation of said hydraulic motor to said speed change output part through said third drive train while said third drive train being isolated or a second transmission mode for transmitting said speed change output part through said first drive train, said differential part and said second drive train while said third drive train being isolated; wherein, referring to a rotational speed ratio of said speed change output part to said speed change input part as a speed ratio, said speed ratio is changed by regulating a discharge of said hydraulic pump or said hydraulic motor, and wherein, during an operation for varying said speed ratio, said transmission mode is changed at a timing when a rotational speed of said group of planetary gears which, if said first transmission mode being set, run idle through said second drive train by the rotation of said speed change output part substantially coincides with a rotational speed of said group of planetary gears if said second transmission mode being set. 3. The continuously variable transmission as set forth in claim 2, wherein said transmission mode is changed at a certain speed ratio in forward traveling referred to as a transmission mode change speed ratio wherein said first transmission mode is set when a set speed ratio for forward traveling is less than said transmission mode change speed ratio or when any speed ratio for rearward traveling is set, and wherein said second transmission mode is set when said set speed ratio for forward traveling is not less than said transmission mode change speed ratio. 4. The continuously variable transmission as set forth in claim 3, further comprising: a fourth drive train for transmitting power from said speed change input part to said speed change output part through neither said hydraulic continuously variable transmission nor said differential part, said fourth drive train is isolated when said continuously variable transmission is placed into either said first or second transmission mode, wherein said continuously variable transmission can be placed into a third transmission mode so that said first and second drive trains are isolated and power from said speed change input part is transmitted to said speed change output part through said fourth drive train, and wherein when said speed ratio for forward traveling is set at the maximum, the rotational speed of said speed change output part becomes substantially the same whether it is generated by said second transmission mode or said third transmission mode, and then, said second transmission mode and said third transmission mode are exchanged for each other. 5. The continuously variable transmission as set forth in claim 4, further comprising: a detection means for detecting a rotational speed of said prime mover, wherein said third transmission mode can be selected only