A drive system and torque distribution method for an electric four-wheel drive vehicle

Abstract

The invention discloses a driving system for an electric four-wheel-drive vehicle and a torque distribution method of the driving system. The torque distribution method comprises the following steps of calculating an optimum torque distribution coefficient according to the current vehicle speed and a driver's desired torque look-up table so as to obtain the optimum desired target torque and reasonably distribute the torque of a front driving system and a rear driving system. In the method disclosed by the scheme of the invention, the torque distribution proportion of the front driving system and the rear driving system is calculated in a real-time manner; compared with the fixed-proportion distribution method adopted in the prior art, the method can better adapt to different driving conditions; through the two-dimensional table of the optimum torque distribution coefficients of the front or rear driving system determined for different demands, corresponding effects can be achieved; and specifically, based on the optimum efficiency of the vehicle power system, the driver's total demand torque is satisfied while the optimum efficiency of the vehicle power system is guaranteed, so that the economical efficiency and the power performance of the vehicle are taken into account.

Description

technical field [0001] The invention relates to the configuration of the vehicle power system and its energy management method, in particular to a torque distribution method for the front and rear drive systems of an electric four-wheel drive vehicle. Background technique [0002] Energy crisis and environmental degradation have become important factors restricting the development of the global economy. Research on energy-saving and environmentally friendly new energy vehicles is one of the effective means to relieve energy pressure and reduce environmental pollution, and new energy vehicles have also been listed as national strategic emerging vehicles. industry. In recent years, my country's new energy vehicles have shown an explosive growth trend. It is expected that the number of new energy vehicles in the country will exceed 5 million in the next five years. Plug-in hybrid electric vehicles and pure electric vehicles with high capacity have become new market highlands th...

AI Technical Summary

Problems solved by technology

[0004] Some existing torque distribution methods for the front and rear drive systems of electric four-wheel drive vehicles are usually based on the premise of satisfying the total torque demanded by the driver. The torque distribution of the front and rear drive systems is carried out according to the ratio, which cannot meet the complex and changeable driving conditions in the actual process

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