Straight driving cycle-oriented real-time optimal torque distribution control method for 4-wheel independent driving electric vehicle

Abstract

The invention relates to a straight driving cycle-oriented real-time optimal torque distribution control method for a 4-wheel independent driving electric vehicle. In allusion to the problem of torquedistribution of a 4-wheel independent driving electric vehicle taking a wheel hub motor as a power unit under a straight driving cycle, a corresponding online optimal distribution control algorithm is formulated; an optimal distribution coefficient table acquired offline is further utilized to perform compensation and correction on an online optimal result; and a torque distribution function anddesign coupling of a vehicle controller are separated, and thereby, implementation of the modular design of control software is facilitated. The method realizes optimal torque distribution of the 4-wheel independent driving electric vehicle under the straight driving cycle, and thus, on the premise of satisfying the driving intention, the energy efficiency of a power assembly can be effectively increased, and meanwhile, it is guaranteed that power performance and braking stability of the vehicle meet the design indexes.

Description

technical field [0001] The invention relates to a torque real-time optimized distribution control method for a four-wheel independent drive electric vehicle facing straight-line driving conditions, belongs to the field of new energy vehicle design and manufacturing, and specifically relates to a torque distribution control technology for a four-wheel independent drive electric vehicle. Background technique [0002] It has only been more than a hundred years since the birth of the automobile, but the oil resources it consumes and the traffic pollution it causes have profoundly affected the development of human society. With the continuous consumption of oil resources, energy security has become a severe challenge to the survival and development of many countries in the world, including China; Manufacturers are clearly aware that the development of electric vehicles is imperative. [0003] The four-wheel independent drive electric vehicle with in-wheel motor as the power unit...

AI Technical Summary

Problems solved by technology

[0004] Constrained by relatively limited battery energy density, cruising range has become an important obstacle preventing electric vehicles from occupying the mainstream market. Therefore, the torque distribution strategy of four-wheel independent drive electric vehicles with the goal of saving energy has received extensive attention. Existing technologies only optimize energy As a single goal, the change of road surface adhesion is usually ignored or the road surface adhesion information is regarded as a known condition in the selection of constraints, and most optimization problems are solved by online numerical iterative calculation

However, in practical engineering applications, it is extremely difficult to obtain the road surface adhesion coefficient in real time, which will make it difficult to implement the existing torque distribution control method or cause a certain axle to lock or slip prematurely due to the lack of necessary constraint information, thus affecting The dynamic and braking performance of the vehicle; at the same time, the online numerical solution of the optimization problem is not conducive to ensuring the real-time performance of the vehicle control

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