Driving system of hybrid electric vehicle based on continuously variable transmission

Abstract

The invention provides an HEV (Hybrid Electric Vehicle) driving system based on CVT (Continuously Variable Transmission). The HEV driving system based on the CVT comprises a combustion engine, a dual-mass flywheel, a planetary gear mechanism, a forward gear clutch, a back gear brake, a driving motor, a motor controller, a battery, a CVT mechanism, a speed reducer mechanism and a differential mechanism assembly, wherein the CVT mechanism comprises a driving belt wheel, a driven belt wheel, a metal belt and an electric oil pump, and a hybrid power dedicated continuously-variable unit is formed by integrating the CVT mechanism with the driving motor, the planetary gear mechanism, the forward gear clutch, the back gear brake, the speed reducer mechanism and the differential mechanism assembly; a hydraulic torque converter is removed by the CVT mechanism, the power of the combustion engine can be transmitted to the CVT mechanism through the dual-mass flywheel; and the driving motor is integrally arranged on the driving belt wheel, and the pressure of a hydraulic system is supplied by adopting the electric oil pump. According to the HEV driving system based on the CVT, provided by the invention, the energy-saving key technologies of an HEV such as low speed electric vehicle, idle speed removing, reduction of engine discharge capacity, motor assistance, steady-state operation of an engine and recovery of brake energy can be better realized.

Description

technical field [0001] The invention belongs to the field of hybrid electric vehicles, and relates to a driving system of a hybrid electric vehicle using fuel oil and electric energy as power sources, in particular to a driving system of a hybrid electric vehicle based on continuously variable transmission with pure electric starting and running functions. Background technique [0002] The development of energy-saving and new energy vehicles has become an inevitable choice for my country's energy strategy. The current focus is to promote the industrialization of pure electric vehicles and plug-in hybrid vehicles, popularize non-plug-in hybrid vehicles and energy-saving internal combustion engine vehicles, and upgrade my country's automobile industry. overall technical level. [0003] The speed ratio of the continuously variable transmission can be changed continuously within a certain range. If it is used in the transmission of hybrid electric vehicles, the operating point of...

AI Technical Summary

Problems solved by technology

[0008] The hybrid driving device can realize many functions of hybrid electric vehicles, especially the high-efficiency pure electric driving function, but the output torque of the motor does not pass through the speed change mechanism during pure electric driving, and the output torque is limited. small moment

In order to realize the functions of idling stop and automatic engine restart, the drive device adds a starter generator between the engine and the clutch, which complicates the structure

[0009] In summary, the shortcomings of the hybrid drive device mainly include the following two points: first, the torque of the motor generator has not been decelerated and increased by the transmission mechanism, so it is not suitable for pure electric starting; second, it uses two motor generators and starter generators motor, complex structure

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