Hybrid power system, control method and vehicle

Abstract

The invention discloses a hybrid power system, which comprises an engine, a hybrid power module and a double-input-shaft speed change mechanism, the hybrid power module is composed of a motor, a planetary gear train, a first clutch and a second clutch, and the planetary gear train is provided with at least three rotating shafts including the first rotating shaft, the second rotating shaft and the third rotating shaft; the rotating speed of the second rotating shaft is between the rotating speed of the first rotating shaft and the rotating speed of the third rotating shaft; a first clutch is arranged between any two of the three rotating shafts; a power output shaft of the engine is connected with a first rotating shaft of the planetary gear train, a rotor of the motor is connected with a second input shaft of the double-input-shaft speed change mechanism and connected with a third rotating shaft through a second clutch, and the second rotating shaft is connected with a first input shaft of the double-input-shaft speed change mechanism. The transmission torque is large, the transmission efficiency is high, the three-axis two-degree-of-freedom planetary gear train is introduced, and the engine and the motor can drive the vehicle to start in a differential mode.

Description

technical field [0001] The invention relates to the technical field of hybrid vehicles, in particular to a hybrid system, a control method, and a vehicle. Background technique [0002] A hybrid vehicle has two power sources, an engine and a motor. Through the mutual cooperation between the two power sources during vehicle driving, it has both the advantages of traditional fuel vehicles and pure electric vehicles, and becomes the best solution to environmental and energy problems. The car model is the power system with the most industrialization and marketization prospects in electric vehicles. [0003] The power output by the engine needs to be transmitted to the wheels through the transmission. Automatic mechanical transmission (AMT) is developed on the basis of manual transmission (MT). It uses several pairs of gears for speed ratio conversion. It has high transmission efficiency, large output torque, mature large-scale manufacturing technology, and low cost. However, th...

AI Technical Summary

Problems solved by technology

However, there is a big weakness in the AMT gearbox: when shifting gears, it is necessary to release the clutch first, then remove the gear, engage a new gear, and then lock the clutch; during the shifting process, the power transmission channel from the engine to the wheels is cut off. When driving, the driving force of the wheels is interrupted, which affects the ride comfort and driving comfort of the vehicle, and limits the application

In addition, the clutch of the AMT gearbox is subject to a large thermal load, which is prone to problems due to overheating; the clutch control technology is very complicated, which is likely to cause vehicle shaking

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