A shift control method for a dual-shaft parallel electric drive system for a vehicle

Abstract

A vehicle biaxial parallel electric drive system and a gear shifting control method thereof. The drive system comprises a drive motor I (1), a drive motor II (15), and an automated mechanical transmission. The automated mechanical transmission comprises a first-gear gear pair (3, 7), a second-gear gear pair (13, 7), a third-gear gear pair (5, 8), a fourth-gear gear pair (10, 8), an engaging sleeve I (4), an engaging sleeve II (12), a transmission input shaft I (6), a transmission input shaft II (11), and a transmission output shaft III (9). The drive system comprises drive motors and an automated mechanical transmission, is simple in structure and reasonably arranged, has high acceleration and gradeability, and implements smooth gear shifting, without any power interruption. By using the gear shifting control method, the continuity of generation of power required for driving can be ensured in a gear shifting process. In addition, kinetic energy ensured during a vehicle traveling process can be converted to electric energy during a braking process, thereby reducing the losses of electric energy, so that the battery costs are reduced and the driving range of the vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle transmission, in particular to a dual-axis parallel electric drive system for a vehicle and a shift control method thereof. Background technique [0002] Environmental protection and energy saving are important issues facing the world in the 21st century. The Chinese government has also proposed the basic national policy of building a conservation-oriented society and the industrial development policy of encouraging the development of small-displacement energy-saving vehicles. Electric vehicles are the way to achieve this goal. One of the important means. [0003] At present, the pure electric drive system widely used in the market includes: multi-speed transmission and traditional drive system with clutch, multi-speed transmission and drive system without clutch, two independent drive motors and fixed gear with drive shaft Transmission device, drive motor and primary reducer transmissio...

AI Technical Summary

Problems solved by technology

[0003] At present, the pure electric drive system widely used in the market includes: multi-speed transmission and traditional drive system with clutch, multi-speed transmission and drive system without clutch, two independent drive motors and fixed gear with drive shaft Transmission device, drive motor and primary reducer transmission device; among them, multi-speed transmission device and traditional drive system with clutch have better acceleration, but there is power interruption when shifting gears; multi-speed transmission device and drive system without clutch The transmission efficiency is high and there is no power interruption; the driving motor and the primary reducer transmission can realize stepless speed change, but the acceleration and climbing ability are poor, and the efficiency of the driving motor is not fully utilized

[0004] In addition, the car has different power requirements during the acceleration, low-speed and high-speed driving stages. If a single motor is used, it is difficult for the motor to work in the high-efficiency operating area all the time, which will easily cause waste of electric energy.

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