Electronic differential system based on relative slip ratio control

Abstract

The invention relates to an electronic differential system based on relative slip ratio control, which is an electronic differential control system of a double-motor independent and direct double-front wheel driving electric automobile. The electronic differential system comprises an accelerator, a controller, a driving motor, a driving wheel, a transmission shaft, a steering angle sensor and an operational processing circuit. The input data of the operational processing circuit includes accelerator signals, rotation speed signals, current value signals and the signals of the steering angle sensor, and the output data of the operational processing circuit includes the control signals of the controller. The operational processing circuit judges the working conditions of motors according tothe current signals, and when the working current of the motors is lower or zero, the control signals are shut off to reset the motors, thereby the motors are restarted. The operational processing circuit converts the rotation speed of the driving wheel into a target rotation speed for operation according to the signals of the steering angle sensor so that the steering mode is converted into a straight-line running mode, the relative slip ratio is calculated by using the rotation speed of the driving wheel; and through using the relative slip ratio as a control parameter and adopting a feedback type controlled closed-loop differential regulating algorithm, the electronic differential function is realized. When the relative slip ratio is not greater than 1%, according to the properties of the motors and the structural characteristic of the double-motor independent and direct driving mode, the electronic differential system has the function of electronic differential self regulation.

Description

technical field [0001] The invention relates to a control system of an electric vehicle, in particular to an electronic differential speed control system of an electric vehicle in which dual motors independently directly drive double front wheels. Background technique [0002] The patent application number is 02136498.2, and the invention name is "four-wheel electronic differential steering control system" discloses a four-wheel electronic differential steering control system, including a motor (1), a brake mechanism (7), a steering mechanism (8 ) and acceleration switch (5), it also includes motor controller (2), angular displacement sensor (6), speed sensor (3) and central processing unit (4), described motor controller (2), angle Displacement sensor (6), rotational speed sensor (3), brake mechanism (7), steering mechanism (8) and acceleration switch (5) are respectively connected to each corresponding port of central processing unit (4), and this central processing unit c...

AI Technical Summary

Problems solved by technology

[0008] The electronic differential control systems of electric vehicles that have been published include electronic differential control systems based on slip ratio control and electronic differential control systems based on drive torque control, but they are only based on ideal models. In this way, the calculation amount of the control is increased, and the control is in an unstable state

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