The invention relates to a torque distribution method and system for an electric four-wheel-drive automobile, and the method specifically comprises the steps: S1, obtaining the slip rate of rear wheels based on a reference automobile speed and the automobile speed of the rear wheels, judging whether the rear wheels slip or not, if yes, entering S2, and otherwise, ending; s2, the front axle torque distribution coefficient and the rear axle torque distribution coefficient are corrected, the corrected front axle torque distribution coefficient is made to be larger than the front axle torque distribution coefficient before correction, the corrected rear axle torque distribution coefficient is made to be smaller than the corrected rear axle torque distribution coefficient, and the front axle torque distribution coefficient and the rear axle torque distribution coefficient are the same in change amplitude; the variation amplitude is related to the slip rate of the rear wheel. The mode of increasing the transfer torque distribution coefficient of the front wheel is adopted, which is equivalent to coefficient correction, so that the effects of enabling the non-slip front wheel to output more power and enabling the whole vehicle to climb up 10% of a butt joint slope through front wheel driving are achieved, meanwhile, independent matching does not need to be carried out aiming at different modes, and meanwhile, the problems of function activation and condition deterioration are also avoided.
本发明涉及一种电动四驱汽车的扭矩分配方法及系统,所述方法具体为:S1:基于参考车速和后轮车速,获取后轮的滑移率,判断后轮是否发生滑移,若发生则进入S2,否则结束;S2:修正前轴扭矩分配系数和后轴扭矩分配系数,令修正后前轴扭矩分配系数大于修正前前轴扭矩分配系数,修正后后轴扭矩分配系数小于修正后后轴扭矩分配系数,前轴扭矩分配系数与后轴扭矩分配系数的变化幅度相同,变化幅度与后轮的滑移率相关。本发明采用增加前轮转移扭矩分配系数的方式,相当于系数修正,起到了令不打滑的前轮多出力,通过前轮驱动,使整车爬上10%对接坡的效果,同时增加不需要针对不同的模式进行单独匹配,同时也避免了功能激活,情况“恶化”的问题。
Torque distribution method and system for electric four-wheel-drive automobile
一种电动四驱汽车的扭矩分配方法及系统
2022-11-01
Patent
Electronic Resource
Chinese
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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