Automatic emergency braking method and device

Abstract

The invention provides an automatic emergency braking method and an automatic emergency braking device. The method comprises the steps that a corresponding relationship of road adhesion coefficient and target deceleration is set, and the target deceleration obtained through the corresponding relationship can avoid the intervention of a deadlock prevention braking system under the condition of the road adhesion coefficient; the current road adhesion coefficient is obtained via the deadlock prevention braking system; the corresponding relationship is searched according to the current road adhesion coefficient, so that the current target deceleration is obtained; the collision time is calculated according to the speed of the vehicle, the speed of a front vehicle, the distance between the two vehicles and the current target deceleration; when the collision time is less than a threshold value, the automatic emergency braking is carried out according to the current target deceleration. The automatic emergency braking method and the automatic emergency braking device aim to ensure the performance of the automatic emergency braking system and prevent the occurrence of collision accidents when the vehicle runs under lower road adhesion coefficient.

Description

technical field [0001] The invention relates to the field of vehicle emergency braking control, in particular to an automatic emergency braking method and device. Background technique [0002] The working principle of the automatic emergency braking system in existing vehicles is: use environmental sensors, millimeter-wave radar or cameras to detect the vehicle in front, and when the controller judges that the two vehicles are about to collide, send a braking command to the anti-lock braking system Apply the brakes. The braking command sent by the controller in the automatic emergency braking system is mainly the target deceleration to avoid collision, and the target deceleration is the same regardless of whether it is sunny, rainy or snowy. The anti-lock braking system can ensure that the wheels are not locked during emergency braking of the vehicle, thereby ensuring the braking performance of the vehicle. [0003] When it is raining or snowing, the adhesion coefficient o...

AI Technical Summary

Problems solved by technology

[0003] When it is raining or snowing, the adhesion coefficient of the road surface will be greatly reduced. At this time, if the vehicle brakes suddenly, it is easy to activate the anti-lock braking system. Although the wheels can prevent locking and improve the braking performance of the vehicle, the vehicle may Due to the influence of the anti-lock brake system, the target deceleration set on dry roads cannot be achieved, resulting in a rear-end collision accident

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