Power coupling transmission device of hybrid vehicle

Abstract

The invention provides a power coupling transmission device of a hybrid vehicle, which is characterized in that a speed changer of a fixed shaft with fixed reduction ratio is adopted as the power coupling and transmission device. Through the device of the invention, the vehicle can realize the following three working modes: A, hybrid power mode; B, pure electric mode; and C, parking power generation mode. The device avoids the working conditions of high oil consumption and much discharged pollutant under the working conditions of starting, idling and low-speed small load of a vehicle engine, makes full use of an economic oil consumption working region of the engine, and meanwhile exerts the characteristics of large starting torque of a motor and high energy conversion efficiency at the proper rotating speed. The whole device is automatically controlled so as to greatly reduce the labor intensity of a driver. Different parameters can be set according to different vehicle types and different using environments so as to facilitate the controlling and calibrating of the vehicles.

Description

technical field [0001] The invention relates to the field of power transmission systems of automobiles, in particular to a power transmission system of a hybrid vehicle, in particular to a power coupling and driving device of a hybrid hybrid vehicle. Background technique [0002] Hybrid electric vehicles (HEV) have become the development direction of clean and efficient vehicles, the best way to solve environmental protection and energy-saving problems, and the inevitable choice for the sustainable development of my country's automobile industry. Hybrid vehicles using traditional internal combustion engines and battery-motors as power systems have become a hot research topic in automotive power system technology due to their advantages of low energy consumption and low emissions. [0003] Since hybrid vehicles use two kinds of power sources as power devices, various components, layouts and control strategies are different, thus forming a variety of structural types. There a...

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies or defects in the existing hybrid powertrain. For example, the Toyota THS assembly needs to be improved in terms of power due to the characteristics of the planetary mechanism "variable speed and constant torque". If major improvements are not adopted It is difficult to change the transmission ratio in a large range, and it is only suitable for light hybrid cars with little change in load and its topological layout and control are also complicated.

Another example is that some series-parallel assemblies that adopt mechanical working mode switching are only suitable for the primary control strategy of simple mode switching corresponding to a few given typical working conditions, and it is difficult to quickly, smoothly and frequently switch between multiple working modes , which is not conducive to adopting advanced optimization control strategies to achieve vehicle performance optimization goals such as ultra-low emissions, improved fuel economy and power performance

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