阅读说明：本技术 一种新能源汽车驱动方法 (New energy automobile driving method ) 是由 王宇 鲍明凯 孙可 于 2019-12-30 设计创作，主要内容包括：本发明提供了一种新能源汽车驱动方法,采用调节电机驱动扭矩的方式,在滑移率超出最优滑移率控制区间后,采用经典的PI控制方式,使所述滑移率回归至最优滑移率控制范围,当所述滑移率处在最优区间时,直接输出整车即驾驶员油门踏板的需求扭矩。实现了所述滑移率的实时、连续、自动调节,相较于传统ESP(Electronic Stability Program)系统,能够在不增加硬件成本的情况下,改善整车在湿滑路面上的启动、驱动扭矩输出,提升调节精度,减小了刹车片的磨损,也进一步避免了驱动防滑功能起作用时所引起的车辆扭矩波动与车身抖动。(The invention provides a new energy automobile driving method, which adopts a mode of adjusting motor driving torque, adopts a classical PI control mode after a slip rate exceeds an optimal slip rate control interval to enable the slip rate to return to an optimal slip rate control range, and directly outputs the required torque of a finished automobile, namely a driver accelerator pedal, when the slip rate is in the optimal interval. Compared with the traditional ESP (electronic Stability program) system, the system can improve the starting and driving torque output of the whole vehicle on a wet and slippery road surface without increasing the hardware cost, improve the adjusting precision, reduce the abrasion of a brake pad, and further avoid the vehicle torque fluctuation and the vehicle body shake caused by the function of the driving antiskid function.)

1. A new energy automobile driving method is characterized by comprising the following steps:

s1: comparing the first required torque transmitted by the vehicle control unit with a set torque threshold, and executing S2 when the first required torque is greater than the set torque threshold; otherwise, the motor of the new energy automobile outputs the first required torque;

s2: obtaining a slip rate according to the current operation parameters of the new energy automobile, and executing S3 if the slip rate exceeds a set slip rate threshold interval; otherwise, the motor of the new energy automobile outputs the first required torque;

s3: obtaining a second required torque by using a PI control algorithm according to the current operation parameter, the slip ratio and the set slip ratio threshold interval;

s4: calculating the first required torque and the second required torque in a small mode, and if the first required torque is smaller than the second required torque, using the first required torque as the motor output torque of the new energy automobile; and if not, taking the second required torque as the motor output torque of the new energy automobile.

2. The new energy vehicle driving method according to claim 1, wherein the new energy vehicle cyclically operates the new energy vehicle driving method.

3. The new energy automobile driving method according to claim 1, wherein the new energy automobile comprises driving wheels, and the obtaining of the slip ratio of the current driving state of the new energy automobile comprises obtaining the slip ratio according to the driving wheel radius, the driving wheel rotating speed and the whole automobile speed of the new energy automobile, wherein the slip ratio is obtainedAnd S is the slip ratio, r is the radius of the driving wheel, w is the rotating speed of the driving wheel, and u is the speed of the whole vehicle.

4. The new energy automobile driving method according to claim 1, wherein the PI control algorithm adopts hysteresis processing when judging whether the slip ratio exceeds the set slip ratio threshold interval.

5. The new energy vehicle driving method according to claim 4, wherein if a fluctuation range of the slip ratio is smaller than a set threshold value, the required torque is smoothed.

6. The new energy automobile driving method according to claim 4, wherein the PI control algorithm comprises enabling the slip ratio to return to the set slip ratio threshold interval.

7. The new energy vehicle driving method according to claim 4, wherein when the first required torque and the second required torque obtained by the PI control algorithm are switched, a smooth transition is completed by avoiding a sudden change in torque in a manner of maintaining an integral value of a previous control period and gradually returning to the first required torque.

8. The new energy vehicle driving method according to claim 1, wherein the current operating parameters include: the first required torque, the motor rotating speed of the new energy automobile and the whole automobile speed of the new energy automobile.

9. The new energy automobile driving method according to claim 1, wherein the threshold interval of the set slip ratio is 0.1-0.3.

10. The new energy automobile driving method according to claim 1, wherein the set torque threshold comprises 10 twisted meters.