Steering stability control system and method based on four-wheel independent driving electric vehicle

Abstract

The invention discloses a steering stability control system and method based on a four-wheel independent driving electric vehicle. The system comprises an external monitoring module and a central control module; the external monitoring module comprises four pressure sensors, a road surface environmental sensor, four tire road detectors, a steering wheel rotation angle sensor, a yaw velocity sensorand a speed sensor, and the central control module comprises an instability device and an emergency processing execution system. According to the steering stability control system and method, factorssuch as a real-time friction factor and dynamic load transfer are considered at the same time, the ideal rotation angle and ideal yaw velocity which continuously change under the real-time state arecalculated, an ideal value is tracked, the problem is solved that the stability control system cannot change along with the state to conduct control adjustment, and accordingly the control system is more accurate, practical and available. According to the steering stability control system and method, steering instability is divided into two steps of rotation angle adjustment and yawing moment adjustment, a tracking algorithm and a neural network PID algorithm are combined and applied to rotation angle stability control, and the steering stability is greatly improved.

Description

technical field [0001] The invention relates to the fields of traffic safety and electronics, in particular to a steering stability control system and method based on four-wheel independently driven electric vehicles. Background technique [0002] Four-wheel independent drive electric vehicles have attracted much attention due to their energy-saving, high-efficiency, flexible real-time control and other characteristics. Due to the non-linear cornering characteristics of tires, when the car is turning, if the car is controlled according to the experience of ordinary drivers, the car will easily enter a serious understeer or oversteer state, and it will be difficult for the driver to control the car back. In normal driving conditions, the car will lose control and cause serious traffic accidents. [0003] At present, in terms of the steering safety of four-wheel independent drive trams, the problem of steering instability is seldom considered comprehensively, and the instabil...

AI Technical Summary

Problems solved by technology

Due to the non-linear cornering characteristics of tires, when the car is turning, if the car is controlled according to the experience of ordinary drivers, the car will easily enter a serious understeer or oversteer state, and it will be difficult for the driver to control the car back. In normal driving conditions, the car will lose control and cause serious traffic accidents

[0003] At present, in terms of the steering safety of four-wheel independent drive trams, the problem of steering instability is seldom considered comprehensively, and the instability caused by load transfer and four-wheel contact with the road surface due to different friction factors is rarely considered.

In reality, when the vehicle is turning, it is easy to have unequal loads, and the friction coefficient of the road surface may be different due to the difference in the illumination angle, which is prone to traffic accidents.

On the other hand, since the vehicle is prone to instability and rollover under steering conditions, a corresponding and reasonable distribution of corner angle and yaw moment should be carried out according to different vehicle speeds. If the driver does not adjust the corner angle in time, accidents are likely to occur

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