Electronic differential for electric vehicle

Abstract

The invention relates to an electronic differential for an electric vehicle. The electronic differential is used for the double-motor rear drive electric vehicle and comprises a vehicle controller andfurther comprises left and right driving wheel rotating speed controllers, a steering wheel rotation angle sensor, left and right driving wheel rotating speed sensors and an accelerator pedal sensorwhich are connected with the vehicle controller. The vehicle controller comprises a braking judging module used for judging whether the electric vehicle is in a braking state or not, a turning judgingmodule used for judging whether the electric vehicle is in a turning state or not, a differential control module with a preset speed equation model, and a vehicle speed sensor breakdown judging module used for judging whether a vehicle speed sensor breaks down or not. Data collected by all the sensors are input into the vehicle controller and calculated by the speed equation model, and then the rotating speeds of a left driving wheel and a right driving wheel are distributed by the left and right driving wheel rotating speed controllers. According to the electronic differential, the capability of the vehicle for getting out of trap is promoted by a large margin, the number of parts of a transmission system is decreased, and the transmission efficiency of the vehicle is improved.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and in particular relates to an electric vehicle electronic differential. Background technique [0002] When the car is running, in order to complete the turn, the turning radius of the inner wheel needs to be smaller than the turning radius of the outer wheel, so the speed of the inner wheel needs to be lower than the speed of the outer wheel. If the rear wheel shaft is made as a whole, the two driving wheels must have the same angular velocity, but because the track lengths of their running are different, it will inevitably lead to slipping or slipping of the driving wheel on one side, which will not only make the tire Premature wear and tear will increase the energy consumption of the car, and it will easily cause the car to lose the ability to resist sideslip when turning, and then a tire will slip, resulting in poor handling and stability. [0003] In order to solve the above problems, peop...

AI Technical Summary

Problems solved by technology

Differentials are divided into electronic differentials and mechanical differentials. The characteristic of a mechanical differential is that no matter whether the vehicle is turning or driving straight, the sum of the speeds of the wheels on both sides is twice the speed of the differential case, which can Make the vehicle turn normally, but when one of the driving wheels of the vehicle gets stuck in the mud and spins, the other driving wheel that is not stuck in the mud will lose power, and the current electronic differential is essentially an electronic differential lock (English The full name is Electronic Differential System), which is an extended function of ABS. When the driving wheel is stuck in the mud and idling, it can indirectly improve the adhesion of the wheel on the other side by braking the idling wheel, but this method cannot be accurate. Control will lose a lot of power, so the response to getting out of trouble is slow, and the effect of getting out of trouble is poor

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