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

Abstract

The present invention relates to a dual-planetary gear train multi-mode hybrid power system. The system comprises an internal combustion engine system assembly (300), an integrated starting power generator motor (20), a drive motor (18), a hybrid power control unit (9), a first planetary gear train (200) and a second planetary gear train (100); the internal combustion engine system assembly (300)includes a one-way clutch (303) and is connected with a first gear ring (201), the integrated starting power generator motor (20) is connected with a first sun gear (204), the drive motor (18) is connected with a second sun gear (103), the first planetary gear train (200) is connected with a second gear ring (101) through an output shaft of the tail end of the first planetary gear train with a first planetary carrier (202) as output, a locking clutch (203) is installed on the output shaft, and power is output to a whole vehicle through a second planetary carrier (104). According to a multi-mode hybrid power control method, just by controlling the target torque or rotational speed of the locking clutch and each power component, free switching among eight modes can be achieved.

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 multi-mode hybrid power system with simplified double planetary gear trains and a control method. Background technique [0002] At present, the energy crisis and environmental pollution are becoming more and more serious, and 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 an efficient solution for energy saving and emission reduction. In a general hybrid system, the main power components include an internal combustion engine, an integrated starter generator motor, and a drive motor. The system can realize the series operation mode and parallel operation mode of the entire hybrid system by using different power flow coupling controls. Or hybrid working mode. [0003] The more advanced hybrid systems in ...

AI Technical Summary

Problems solved by technology

But this invention has the following technical defects: First, the technical solution is to use the front brake to lock the front ring gear, output torque through the front sun gear, and the generator performs torque coupling with the output power of the engine on the front sun gear. It can be seen that its front The planetary gear train only plays the role of reducing torque and increasing speed for the engine

Therefore, there are following technical defects in the described front row planetary gear train: first, if the front brake does not take effect, that is, the front ring gear is not braked, the engine will not be able to output power, causing its output power to be completely transmitted to the front gear. Second, if the front brake acts, that is, the front ring gear brakes, since the engine is connected to the front planet carrier, the front ring gear brakes, and the front sun gear outputs, then for the engine, the The front row planetary gear train will have the reverse adverse effect of "torque reduction and acceleration", which is obviously contrary to the general engine characteristics

However, in this invention, the second planet carrier of the second planetary gear train is fixedly connected to the vehicle frame, the second motor is connected to the second sun gear, and the power of the second ring gear and the first planetary gear train is torque-coupled to the rear. The whole vehicle outputs power, so the second planetary gear train is only equivalent to a reduction device, and does not play the role of speed coupling

In addition, this invention needs to control the clutch and brake at the same time to realize the switching between the working modes, and it cannot realize the series working mode, so it still has the technical defects of complex control system and poor practicability, which needs to be improved urgently

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