Hybrid power system and control method thereof

Abstract

The invention discloses a hybrid power system and a control method thereof. The hybrid power system comprises a first motor, a second motor, a battery pack, a first planet row, a second planet row, a first gear pair, a second gear pair, a first input shaft, a second input shaft, a third input shaft, a first engaging sleeve, a second engaging sleeve and the like. By sequentially connecting and controlling combination and withdrawing of the first engaging sleeve and the second engaging sleeve, the hybrid power system has various working modes which include a pure electric driving mode, two parallel driving modes, a series-parallel driving mode and an energy recycling mode, the defects that the working efficiency of an engine is low in a pure torque coupling mode, and the power performance is insufficient in the pure rotation speed coupling mode are overcome, and the economical efficiency of fuel and the power performance are ensured at the same time. According to the hybrid power system, the engaging sleeves which are simple in structure are adopted, compared with adoption of a friction clutch, the hybrid power system is more compact in overall structure, meanwhile slide-friction energy loss generated by the friction clutch can be avoided, and the overall efficiency of the system can be improved.

Description

technical field [0001] The invention relates to the technical field of hybrid power transmission of motor vehicles, in particular to a hybrid power system and a control method thereof. Background technique [0002] A hybrid power system refers to a system in which two or more power sources drive a vehicle individually or jointly through a power coupling device. According to the coupling mode of the power source, the hybrid power system can be divided into series type, parallel type and hybrid type. Although the series hybrid system is simple in structure, it has many energy conversion links and low overall efficiency, and is generally used in extended-range electric vehicles. In the parallel hybrid system, there is a coupling relationship between the engine and the wheels, subject to the speed of the wheels, the engine often works outside the optimal fuel consumption speed range. The hybrid hybrid system has the advantages of both series and parallel, flexible control stra...

AI Technical Summary

Problems solved by technology

[0003] Although the fuel economy of Prius's parallel structure is better, but limited by the dynamic characteristics of the planetary row, the output torque of the three elements is in a fixed ratio, which cannot provide a large distance-increasing effect

In addition, the highest efficiency of the engine is generally reflected in high-speed conditions. Since the parallel structure of the Prius cannot allow the engine to directly drive the wheels, there is still room for improvement in the fuel economy of the engine under high-speed conditions.

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