Transmission system of double-motor four-drive electric automobile

Abstract

The invention relates to a transmission system of a double-motor four-drive electric automobile and belongs to the field of electric automobiles. In the transmission system of the double-motor four-drive electric automobile, mechanisms capable of realizing two stage transmission are mounted on a front main shaft and a rear main shaft; each two-stage transmission mechanisms is driven by a motor; and moreover, in the transmission system of the double-motor four-drive electric automobile, a speed sensor I and a speed sensor II are vehicle speed sensors and are matched with a controller; and through double motor coordinated control, compensation power performs rotation speed synchronous control on the gear shifting process in a two-wheel / four-wheel driving mode. According to the transmission system of the double-motor four-drive electric automobile, through double motor coordinated control, the motor can be enabled to furthest work in an efficient area so that the efficiency of the transmission system is enhanced, and the driving range is guaranteed; and meanwhile, two-wheel / four-wheel drive can be carried out under multiple working conditions such as starting, high speed sudden acceleration and low adhesion pavement so as to further improve vehicle power performance and multi-condition adaptability; non-powered interruption gear shifting can be realized; and the impact in the gearshifting process can be reduced.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and in particular relates to a transmission system of a dual-motor four-wheel drive electric vehicle. Background technique [0002] With the increasing demand for social environmental protection, the development and use of electric vehicles with the characteristics of zero emissions, low heat radiation, and low noise has strategic significance for the development of my country's automobile industry to keep pace with the times. An electric vehicle is a vehicle that uses a vehicle-mounted power battery as an energy source, uses an electric motor to drive the wheels, and meets the requirements of road safety regulations for vehicles. Its motor is the core component of the power transmission system of pure electric vehicles. The motor has the characteristics of constant torque at low speed, constant power at high speed, and fast response. According to these characteristics of the drive motor, using ...

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Problems solved by technology

[0003] At present, a large number of single-motor two-drive fixed transmission ratio mechanisms are used in my country's new energy vehicle market, which needs to be matched with a high-power electric drive system, resulting in large volume and weight of the motor and low efficiency, which reduces the driving range of electric vehicles and cannot take into account low speed. Two characteristics of high torque and high speed and high power; some two-wheel-drive electric vehicles adopt dual-motor drive or a single-motor drive system equipped with a two-speed AMT transmission, which solves the problems of large volume, weight, high cost and low efficiency of the motor to a certain extent. But at the same time, there are problems such as low shifting quality, poor riding comfort and weak adaptability to working conditions; while four-wheel drive electric vehicles generally adopt a front and rear axle dual motor fixed transmission ratio direct drive structure, although to a certain extent it improves the vehicle's performance. Power and escape ability, but there are still problems such as high motor cost, large volume and weight, and relatively low efficiency, which cannot meet the vehicle performance expected by users for four-wheel drive electric vehicles.

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