Multi-mode power dividing type hybrid power transmission including dual-planetary-gear set

Abstract

The invention relates to a multi-mode power dividing type hybrid power transmission including a dual-planetary-gear set. The multi-mode power dividing type hybrid power transmission is used for connecting an engine, a first motor and / or a second motor to an output shaft. The multi-mode power dividing type hybrid power transmission comprises double planetary lines, a first clutch, an engine, a first brake and a second brake. The first planetary line comprises a first outer gear ring, a first sun wheel, a first plant wheel and a first planet carrier, wherein the first plant wheel and the firstplanet carrier are engaged with the first outer gear ring and the first sun wheel correspondingly, the second planetary line comprises a second outer gear ring, a second sun wheel, a second planet wheel and a second planet carrier, wherein the second planet wheel and the second planet carrier are engaged with the second outer gear ring and the second sun wheel correspondingly, one side of the first clutch is connected with the first outer gear ring, and the other side of the first clutch is connected with the second outer gear ring; and the engine is connected with the first sun wheel, the first brake is fixedly connected with a shell of the transmission and controllably connected with the first sun wheel, and the second brake is fixedly connected with the shell of the transmission and controllably connected with the second outer gear ring. Compared with the prior art, the multi-mode power dividing type hybrid power transmission has the advantages that the mechanical complexity is low, the control difficulty is low, and the multi-mode power dividing type hybrid power transmission has the multiple modes.

Description

technical field [0001] The invention relates to the driving field of electromechanical hybrid vehicles, in particular to a multi-mode power-split hybrid transmission including double planetary gear sets. Background technique [0002] Electromechanical hybrid vehicles usually involve the use of an internal combustion engine and one or more electric motors / generators. Power-split hybrid transmissions can be used in hybrid vehicles, allowing them to use different power sources under different operating conditions. By controlling the engine and electric motors The combination of / generator and brake and clutch, the power split hybrid transmission can make the vehicle work in different operating modes, such as: pure electric drive mode, input power split continuously variable drive mode and compound power split continuously variable transmission Drive mode and fixed ratio drive mode, etc., can improve fuel economy. [0003] Power-split hybrid transmission generally refers to sp...

AI Technical Summary

Problems solved by technology

The second torque transmission mechanism establishes torque flow between the second member of the second planetary gear set and the third member of the first planetary gear set. In the technical solution, the first and second power split operating modes are both input power split mode, the driving efficiency of the system is high when the vehicle is running at a low speed, and the driving efficiency of the system is low when it enters high-speed driving; in addition, in the second electric-only running mode, all shift elements are engaged, from the first When switching from the first electric-only mode to the second electric-only operating mode, the electronic control complexity is relatively high, and three shifting elements must be controlled at the same time

Its size, cost and control difficulty are relatively large

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