Drive control system of double motors of rear axle of electric automobile

Abstract

The invention relates to a drive control system of double motors of a rear axle of an electric automobile. To the closed-loop control of the average speed of double motors in the control system, a single driving wheel adopts a method of given torque control and speed follow-up to carry out the closed-loop control of the average speed of double motors, so that the automobile can run according to the target automobile speed of a driver, the rotational speeds of double motors are also permitted to be inconsistent under the condition of different loads, and the self-adapting differential performance of the turning of the low-speed running of the electric automobile is realized. By designing in this way, the differential control requirement of the curve running of a low-speed electric automobile is met, the use of a complicated electronic differential algorithm is avoided, and the cost of the system is lowered. By utilizing the self-adapting differential performance during turning, the torque distribution of double motors is further regulated according to the difference of the rotational speeds of double motors, the power-assisted steering of the curve running of the automobile is realized, the energy loss is decreased, and the effect of energy saving is achieved.

Description

technical field [0001] The invention relates to a dual-motor drive control system for the rear axle of an electric vehicle. Background technique [0002] Most of the current electric vehicles use a dedicated permanent magnet brushless DC bridge motor. This integral bridge structure connects two independent permanent magnet brushless DC motors into one body. The problem of gearbox deceleration and gear differential speed also overcomes the shortcomings of electric vehicle drive system, such as large volume, low efficiency, heavy weight, and high cost. It has the advantages of small size, light weight, low cost, and high efficiency. It is a modern electric vehicle first choice. For the dual motors of this structure, the commonly used control method is to use the independent direct drive mode of the dual motors. The drive motors are respectively controlled by two controllers of the same specification. The accelerator pedal signal is distributed to the left and right motors thr...

AI Technical Summary

Problems solved by technology

[0002] Most of the current electric vehicles use a dedicated permanent magnet brushless DC bridge motor. This integral bridge structure connects two independent permanent magnet brushless DC motors into one body. The problem of gear box deceleration and gear differential speed also overcomes the shortcomings of electric vehicle drive system, such as large volume, low efficiency, heavy weight and high cost, and has the advantages of small size, light weight, low cost and high efficiency. It is a modern electric vehicle preferred

For the dual motors of this structure, the commonly used control method is to use the independent direct drive mode of the dual motors. The drive motors are respectively controlled by two controllers of the same specification. The accelerator pedal signal is distributed to the left and right motors through the electronic differential to realize Electronic differential function, and such a control structure is relatively complicated, and the control algorithm of the electronic differential is complicated, the cost is high, and the superior performance of the dual-motor coordinated work cannot be fully utilized

Images