Double planetary gear train multi-mode hybrid power system and control method

Abstract

The invention relates to a double planetary gear train multi-mode hybrid power system which comprises an engine assembly (300), an integrated starting power generator (19), a main driving motor (14), a first planetary gear train assembly (200) and a second planetary gear train assembly (100). The engine assembly (300) comprises an engine (301), the first planetary gear train assembly (200) comprises a first gear ring (203), a first planet carrier (204) and a first sun gear (205), and a clutch (16) is arranged between the first planetary gear train assembly (200) and the second planetary gear train assembly (100); and an output shaft of the engine (301) is connected with the first planet carrier (204), the integrated starting power generator (19) is connected with the first sun gear (205), and the first gear ring (203) is arranged to be an output end. The invention further relates to a control method based on the double planetary gear train multi-mode hybrid power system and comprises a control method of eight working modes. By means of the double planetary gear train multi-mode hybrid power system and the control method, it is guaranteed that the engine works in the best fuel oil economic zone, and the overall vehicle comprehensive efficiency is at the high level.

Description

technical field [0001] The invention relates to a hybrid power system and a control method of a hybrid electric vehicle, in particular to a dual-planetary multi-mode hybrid power system and a control method. Background technique [0002] Facing the increasingly severe energy crisis and environmental pollution in today's world, the development of new energy vehicles has become one of the important research directions in the field of automotive technology. Hybrid drive system and hybrid electric vehicles are currently an efficient solution for energy saving and emission reduction. The main power components generally include engine, ISG motor and drive motor. Through different power flow coupling control, they can work in series mode and parallel mode or hybrid mode. The internationally advanced hybrid systems are mainly the THS system of Toyota and the i-MMD system of Honda. The THS system mainly realizes power splitting and confluence between different power sources through...

AI Technical Summary

Problems solved by technology

Therefore, there is the following technical defect in the described front row planetary gear train: first, if the front brake 3 does not take effect, that is, the front ring gear 2 is not braked, the engine 1 will not be able to output power, causing its output power to be completely transmitted idling on the front ring gear 2; second, if the front brake 3 works, the front ring gear 2 will be braked. Since the engine 1 is connected to the front planetary carrier 15, the front ring gear 2 will brake, and the front sun gear 16 will output, then for engine 1, the front row planetary gear train will produce the reverse adverse effect of "reducing torque and increasing speed", which is obviously contrary to the general engine characteristics

However, since the invention sets the clutch 2 at the output end of the engine 1, it cannot guarantee the stability of the working state of the clutch 2, nor can it realize the series operation mode and the parallel operation mode of the hybrid power.

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