Hybrid driving system for automobile and gear operating method thereof

Abstract

The invention relates to a hybrid driving system and a gear operating method thereof. The system comprises an internal-combustion engine, a first motor, a second motor, a planet coupling mechanism, a retarding mechanism and a differential mechanism, wherein an output shaft of the internal-combustion engine is connected with an input shaft of the first motor; an output shaft of the first motor is connected with an output shaft of the second motor by a first clutch; and the output shaft of the second motor is connected with one of a sun wheel and a gear ring of the planet coupling mechanism at the position of the axial direction of the output shaft, and output shaft of the second motor is connected with the other one of the sun wheel with a brake and the gear ring by a second clutch at the other position of the axial direction of the output shaft. In the hybrid driving system, two gear levels of forward gears of an automobile are formed by adjusting the planet coupling mechanism, so that operating modes and corresponding gears are selected flexibly according to different running work conditions of the automobile to achieve the effects of low emission and oil consumption, high kinetic energy and the like of the integral automobile.

Description

technical field [0001] The present invention relates to an automobile hybrid driving system, more particularly, relates to an automobile hybrid driving system comprising a planetary gear coupling mechanism and a reduction mechanism. In addition, the present invention also relates to a gear operation method of a vehicle hybrid driving system. Background technique [0002] At present, the requirements for environmental protection of automobiles are becoming increasingly stringent. Pure electric vehicles (EVs) cannot technically meet the power requirements of vehicles under different working conditions, while hybrid electric vehicles (HEVs) have achieved rapid development due to their advantages in power and environmental protection. [0003] A hybrid vehicle has two different power sources, namely a motor and an internal combustion engine. The hybrid drive system of the vehicle is divided into a series drive system, a parallel drive system and a hybrid drive system according ...

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Problems solved by technology

[0007] But this speed change mode of hybrid electric vehicle can not adapt to the needs under the different working conditions of automobile, for example, for the disclosed hybrid electric drive system of above-mentioned CN2693516Y, when automobile is in climbing (assuming that slope is the full load of this automobile In the case of the limit slope that can be driven), it is necessary to make the output power of the internal combustion engine 100 and the electric motor 200 to reach the maximum after coupling, and the output speed of the electric motor 200 should reach the maximum in this situation, but the output speed must be decelerated by the speed reduction mechanism. Only by increasing the torque can the car climb uphill (especially when the car is fully loaded and has a large mass), in order to adapt to this working condition, the reduction ratio of the reduction mechanism must be designed to be larger

However, if this larger reduction ratio is used as the reduction ratio of the hybrid drive system reduction mechanism, it cannot meet the needs of other working conditions of the automobile, for example, when the automobile is unloaded and running on a flat road surface, then It is required that the automobile can run at a relatively high speed. However, since the reduction ratio of the reduction mechanism has been designed to be relatively large, even if the rotational speed of the electric motor 200 and the internal combustion engine 100 after being coupled reaches the maximum, the deceleration through the large reduction ratio of the reduction mechanism, The speed of the car is still not ideal

[0008] From the above analysis, it can be seen that the shifting mode of the traditional vehicle hybrid drive system cannot meet the driving needs of the vehicle under different working conditions, which has always been a difficult problem in the design of the vehicle hybrid drive system.

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