Multi-mode hybrid power transmission system

Abstract

The invention relates to the field of vehicle systems, in particular to a multi-mode hybrid power transmission system. The multi-mode hybrid power transmission system comprises an engine, an ISG motor, a drive motor, a dual-planet-gear train, a clutch, brakes and a drive control system. The system is characterized in that the engine, the ISG motor and the drive motor in different working states can drive an automobile to travel in different working modes, different combination modes of the clutch and the brakes can guarantee different combinations of the externally-output torque of the engine,the externally-output torque of the ISG motor and the externally-output torque of the drive motor, and therefore different modes of the automobile are switched. The hybrid power transmission system is switched to a pure-electric mode so as to guarantee that the automobile travels efficiently and stably, the hybrid power transmission system is switched to a hybrid power low-speed operation mode soas to charge a power battery, meanwhile, the engine can be effectively controlled to start and stop, the kinetic energy generated in the braking process of the engine is recycled, the hybrid power transmission system is switched to a hybrid power high-speed mode so as to guarantee that the automobile travels safely and reliably, and meanwhile it can be guaranteed that the fuel consumption amountin the cruising process of the automobile is small. The whole transmission system can reduce the oil consumption and emission of the whole automobile and reduce vibration and noise of the whole automobile.

Description

technical field [0001] The invention relates to the field of vehicle transmission systems, in particular to a multi-mode hybrid power transmission system. Background technique [0002] With the continuous increase of the state's support for new energy vehicles and the rapid development of battery technology, new energy vehicles have become an inevitable trend in the future development of automobiles. Due to the low mileage of pure electric vehicles and the high cost of batteries, it is difficult to obtain them in my country in the short term. A large number of popularization, hybrid electric vehicles as a transitional product of pure electric vehicles, is an important breakthrough to solve the current energy crisis in our country. However, the structure of the hybrid power system is complex, the cost is high, and the core technology is monopolized by several major foreign automobile companies. In order to overcome the above obstacles, accelerate the commercialization of elect...

AI Technical Summary

Problems solved by technology

However, the structure of the hybrid power system is complex, the cost is high, and the core technology is monopolized by several major foreign automobile companies. In order to overcome the above obstacles, accelerate the commercialization of electric vehicles, improve the economic performance of the vehicle, and reduce the emission of carbon dioxide and other pollutants , it is imperative to develop a range-extended hybrid

[0003] The purpose of the design of the hybrid transmission is to realize different working modes of the hybrid system, such as the motor alone work mode, the engine alone work mode, the engine and the electric motor work together, the power split mode, the regenerative braking mode and the parking charging mode. The hybrid power transmission system mainly includes various forms such as planetary gear type, straight tooth series-parallel type, and dual-motor type Planetary gear train mechanism; GM Cadillac CT6 adopts dual motors and three planetary gear train mechanisms, which can realize multiple working modes. Renault Automobile adopts double planetary gear train mechanism, which can realize infinitely variable speed through two motors, but the working mode is relatively single. Different operating conditions cannot be realized, so it is important to explore multi-mode planetary gear transmission systems

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