Front and rear axle driving force adjusting control method and system of four-wheel drive vehicle, and four-wheel drive vehicle

Abstract

The invention discloses a front and rear axle driving force adjusting control method and a front and rear axle driving force adjusting control system of a four-wheel drive vehicle, and the four-wheel drive vehicle. The method comprises the steps of obtaining required torque of the four-wheel drive vehicle and SOC (state of charging) of a battery system; obtaining a working mode of the four-wheel drive vehicle according to the required torque of the four-wheel drive vehicle and the SOC of the battery system; calculating required torque of a front axle, required torque of a rear axle and a target gear according to the working mode, the required torque and a current speed of the four-wheel drive vehicle; performing filtering on the required torque of the front axle and the required torque of the rear axle; generating a corresponding front axle torque instruction and a corresponding rear axle torque instruction according to the required torque of the front axle and the required torque of the rear axle after filtering and the target gear; and performing control over the four-wheel drive vehicle according to the front axle torque instruction and the rear axle torque instruction. By applying the method disclosed by the embodiment of the invention, the control algorithm of the four-wheel drive vehicle provided with an active suspension can be simplified, and comfort of the four-wheel drive vehicle provided with an inactive suspension can also be improved, so that the user experience is improved.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a front and rear axle driving force adjustment control method of a four-wheel drive vehicle, a front and rear axle drive force adjustment control system of a four-wheel drive vehicle and a four-wheel drive vehicle. Background technique [0002] New energy vehicles have become the trend of today's automobile development. From the perspective of model segmentation, small cars tend to be pure electric direct drive structure, and medium and high-end cars, especially off-road vehicles, tend to be hybrid four-wheel drive structure. For the four-wheel drive system, especially the hybrid four-wheel drive system, the power coupling is realized through the road surface. Since the vehicle suspension is an elastic component, the torque change of the front and rear axles will cause the suspension to deform and cause the vehicle to pitch. Such a structural form , it is more likely to affect t...

AI Technical Summary

Problems solved by technology

[0004] However, the disadvantages of the above-mentioned suspension control are: 1) active suspension needs to be added; 2) the control is complicated; 3) the cost is high

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