Torque distribution method for dual-motor structure of novel energy electric vehicle

Abstract

The invention discloses a torque distribution method for a double-motor structure of a novel energy electric vehicle. The double-motor structure comprises a central main shaft, a permanent magnet synchronous motor, an asynchronous motor and a single-speed-ratio speed reducer system, wherein the permanent magnet synchronous motor, the asynchronous motor and the single-speed-ratio speed reducer system are connected with the central main shaft. The permanent magnet synchronous motor and the asynchronous motor drive the center main shaft to rotate, and the center main shaft is in transmission connection with the single-speed-ratio speed reducer system. And a torque distribution method is determined according to a method for calculating an efficiency value. A high-efficiency permanent magnet synchronous motor and a high-efficiency asynchronous motor are adopted in the double motors; the specific power of the motor needs to be determined according to matched vehicle working conditions. The asynchronous motor uses a synchronous motor rotating speed sensor signal to control the rotating speed difference, and the efficiency control precision of the permanent magnet synchronous motor can be improved. And a torque response area is determined according to accelerator signal decoupling of the driver intention, so that the driving efficiency is improved. Transmission system efficiency can be effectively improved, and energy consumption of the whole vehicle is reduced.

Description

technical field [0001] The invention relates to the technical field of new energy electric vehicles, in particular to a torque distribution method for a dual motor structure of a new energy electric vehicle. Background technique [0002] At present, the electric drive system of pure electric vehicles is mainly based on the structure of single motor and single speed ratio. In China, a single permanent magnet synchronous motor is mainly used, and in Europe and the United States, asynchronous motors are mainly used. At present, there are two main development directions of the electric drive system: one is to develop wheel motors or hub motors to reduce the mechanical loss of intermediate speed change and shaft transmission, and the efficiency is higher, but it has not been popularized due to factors such as reliability; the other is to develop multiple Speed ​​ratio or multi-motor new drive structure. Some single-motor-double-speed-ratio structures have also been mass-produced...

AI Technical Summary

Problems solved by technology

[0003] Disadvantages: 1. The cost of single-motor double-speed ratio increases by about 800-1000 yuan / vehicle, and there is the problem of uneven power output shifting, and the effect of power improvement and energy consumption optimization is limited

2. The existing multi-motor-multi-speed ratio hybrid structure industry chain is immature, the control is complex, and the cost performance is not high. It is only used in a few models such as Marvel X

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