Hybrid power train of vehicle
The present invention makes it possible to implement various stepped gear modes and a compound split type hybrid mode in a relatively simple structure using two planetary gear sets and two motor generators, reduce fuel consumption of a vehicle in a relatively large section, minimize fuel consumption at a high speed by implementing an overdrive stepped gear mode, and improve acceleration performance and gradient performance of the vehicle by implementing an underdrive stepped gear mode.
1. A hybrid power train of a vehicle including an engine, a first motor generator, and a second motor generator, the hybrid power train comprising:
a first planetary gear set which includes a first rotary component, a second rotary component, and a third rotary component;
a second planetary gear set which is operatively linked with the first planetary gear set and includes a first rotary component, a second rotary component, and a third rotary component;
wherein:
the first rotary components of the first and second planetary gear sets are variably connected with each other and the third rotary components thereof are fixedly connected with each other, the first, second, and third rotary components of the first planetary gear set are respectively connected to the second motor generator, the engine, and the first motor generator, the second and third rotary components of the second planetary gear set are variably connected with each other and respectively connected to an output shaft and the first motor generator, and
the first rotary component of first planetary gear set is connected to a first brake,
wherein a first clutch that is variably connected with the second and third rotary components of the second planetary gear set is disposed to change rotational restriction between the second and third rotary components of the second planetary gear set, and
a second clutch that is variably connected with the first rotary component of the first planetary gear set and the first rotary component of the second planetary gear set is disposed to change rotational restriction between the first rotary components, and
the first brake, the first clutch, and the second clutch are configured such that disengagement of the first clutch together with engagement of the second clutch and the first brake provides an underdrive stepped gear mode, and disengagement of the second clutch together with engagement of the first clutch and the first brake provides an overdrive stepped gear mode.
2. The hybrid power train of a vehicle as defined in claim 1 , wherein the first rotary component of the first planetary gear set is connected to the second motor generator, the second clutch, and the first brake,
the second rotary component of the first planetary gear set is connected to the engine, and
the third rotary component of the first planetary gear set is connected to the first motor generator through the second planetary gear set.
3. The hybrid power train of a vehicle as defined in claim 2 , wherein the first rotary component of the second planetary gear set is connected to the first rotary component of
the first planetary gear set through the second clutch,
the second rotary component of the second planetary gear set is connected to the first clutch and the output shaft, and
the third rotary component of the second planetary gear set is connected to the first clutch and the first motor generator.
4. The hybrid power train of a vehicle as defined in claim 1 , wherein the first, second, and third rotary components of the first planetary gear set are a first sun gear, a first carrier, and a first ring gear, respectively and the first, second, and third rotary components of the second planetary gear set are a second ring gear, a second carrier, and a second sun gear, respectively.
5. The hybrid power train of a vehicle as defined in claim 1 wherein the first brake is configured such that engagement of the first brake provides for an overdrive stepped gear mode and an underdrive stepped gear mode.