Stabilization control system and stabilization control method based on four-wheel drive for electric vehicle, as well as electric vehicle

Abstract

The invention discloses a stabilization control system based on four-wheel drive for an electric vehicle. In the stabilization control system, a first stabilization control unit judges whether lateral acceleration is smaller than a preset acceleration threshold; if not, the first stabilization control unit calculates a transverse load transfer rate according to a lateral acceleration signal and judges the state of the electric vehicle according to the transverse load transfer rate; if the electric vehicle is in a first tendency, a second stabilization control unit controls a vehicle body of the electric vehicle to maintain stable; if the electric vehicle is in a second tendency, the first stabilization control unit controls a motor to apply a braking force to an outer front wheel of the electric vehicle through a motor controller; and if the electric vehicle is in a third tendency, the first stabilization control unit controls the motors to apply braking forces to the outer front wheel and an inner rear wheel of the electric vehicle through the motor controllers. In the stabilization control system, the first stabilization control unit takes corresponding vehicle stabilization measures according to different states of the electric vehicle, so that the vehicle body is stabilized. The invention further discloses a stabilization control method based on the four-wheel-drive for the electric vehicle, as well as the electric vehicle.

Description

technical field [0001] The present invention relates to the field of automobiles, and more specifically, to a four-wheel-drive-based electric vehicle stability control system, a four-wheel-drive-based electric vehicle stability control method, and a four-wheel-drive-based electric vehicle. Background technique [0002] With the improvement of people's living standards, cars are widely used as a means of travel. Therefore, the driving safety of the car cannot be ignored. For example, in the normal running process of a car, if the car suddenly needs to avoid obstacles in front of it or the driver slams the steering wheel, the car is prone to rollover accidents. [0003] In recent years, in order to improve the anti-rollover ability of vehicles and further improve the active safety of automobiles, many scholars and automobile manufacturers at home and abroad have conducted extensive research on the problem of vehicle rollover control. At present, the anti-rollover methods tha...

AI Technical Summary

Problems solved by technology

The main disadvantages of this anti-rollover control technology are: 1) On the basis of the original traditional braking system, a motor actuator needs to be added to each wheel separately, resulting in complex structure and increased cost; 2) There is no rollover threshold , and there is no additional lateral acceleration as the basis for judging rollover, driving on a certain inclined road or encountering bumps and bumps is likely to cause misjudgment, leading to control before the rollover condition is met, and frequently triggering the action of the actuator, which not only consumes more 3) The impact of load transfer on braking during rollover is not considered. When rollover is about to occur, the vertical load of the inner wheel decreases, only for the inner wheel The braking control may not achieve the desired effect; 4) The braking force cannot be adjusted in real time according to the state of the vehicle body to maintain the posture of the vehicle body

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