Hybrid power assembly and gear shifting method thereof

Abstract

The invention discloses a hybrid power assembly which comprises an engine, a motor, a gearbox and a gear shifting executing mechanism. The gearbox comprises a first input shaft, a second input shaft,an output shaft and an intermediate shaft, and the engine is connected to the first input shaft through a clutch; the first input shaft is fixedly connected with an input gear and a direct gear combination tooth, and the output shaft is fixedly connected with a motor direct-drive combination tooth and is sleeved with at least one shift gear; the direct gear combination tooth and gear combination teeth can be connected with the output shaft through corresponding synchronizers; a motor rotor shaft and the second input shaft are fixedly connected and sleeve the outer side of the output shaft; thesecond input shaft is sleeved with a coupling gear, and the second input shaft can be connected with and separated from the motor direct-drive combination tooth and a coupling gear combination tooththrough a sliding sleeve which is normally connected with the second input shaft; the transmission ratio of the coupling gear to a third gear of the intermediate shaft is larger than the transmissionratio of the input gear to a first gear of the intermediate shaft. The invention further discloses a gear shifting method of the hybrid power assembly.

Description

technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to a hybrid power assembly and a gear shifting method thereof. Background technique [0002] At present, there are two main technical routes of hybrid power system for buses on the market: parallel system and hybrid system. [0003] The hybrid system includes three modes of series, parallel and hybrid, which can optimize the engine working range and have a relatively high fuel saving rate, but its control is more complicated. Most of the hybrid systems on the market use the motor to directly drive the vehicle, the power performance is average, and the high-torque drive motor is used, the cost is high; some hybrid systems add a four-speed gearbox between the generator and the drive motor to improve the engine workmanship. In this case, the power performance has been improved, but the system structure is complicated, the system weight and volume are relatively large,...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a hybrid powertrain and its gear shifting method. Compared with the current technical solution of driving the vehicle through a gearbox after the power coupling of the engine and the motor, this solution can solve the problem of power interruption of the former gear shifting. Problem: Compared with the current technical solution where the motor is arranged at the output end of the gearbox, this solution can solve the problem that the former needs a large motor torque and a wide operating speed range, which leads to high cost of the motor and battery system, and improves the utilization rate of the motor power

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