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Triggering method of automatic emergency braking system based on prediction

An automatic emergency braking and emergency braking technology, which is applied in the direction of automatic starting device, control device, external condition input parameters, etc., can solve the problems of missing trigger, large system delay, long time, etc.

Active Publication Date: 2019-04-26
BEIJING JINWANAN AUTOMOBILE ELECTRONICS TECH RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of triggering an alarm and automatic braking proposed by WO2004028847A1 is mainly based on the current vehicle situation and a given given braking deceleration, and does not take into account the braking system of the vehicle, especially the truck, when performing a given deceleration There will be a relatively large system delay, which means that the actual braking process should take longer. In order to ensure that the system does not collide, the calculation of the trigger time should be more accurate; at the same time, the original method only considers the vehicle and the vehicle in front. Longitudinal movement, if the vehicle or the vehicle in front has longitudinal and lateral movement, the judgment of the original method will cause more false triggers and missing triggers

Method used

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  • Triggering method of automatic emergency braking system based on prediction
  • Triggering method of automatic emergency braking system based on prediction
  • Triggering method of automatic emergency braking system based on prediction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] The overall thinking of the present invention is: the automatic emergency braking device described in the present invention has two levels of alarms according to the state relationship between the vehicle and the vehicle in front. Brake hard until the risk of collision disappears. The first-level alarm is an audible and visual alarm, which does not cause any acceleration and deceleration operations on the vehicle; the second-level alarm is based on the first-level alarm, adding a tactile alarm, which is divided into two forms: no automatic braking and automatic braking. , the tactile alarm that does not perform automatic braking can be steering wheel vibration, seat belt tightening or seat vibration, etc.; for the tactile alarm that performs automatic braking, it adopts the form of active point braking or slow braking. In order to be able to leave enough time for the driver to react during the warning stage, and to avoid collisions even if the driver completely ignores ...

Embodiment 2

[0170] The difference between this embodiment and Embodiment 1 is that the prediction algorithm of the vehicle in front and the vehicle in front mentioned in the above three exit conditions, the prediction algorithm of the vehicle in front is consistent with the algorithm in the triggering step, and the prediction algorithm of the vehicle in front is consistent with the algorithm in the triggering step. Then according to the different running states of the vehicle, there are some differences from the algorithm in the triggering step, mainly for the purpose of unified calculation, the prediction algorithm of the vehicle is redesigned, and its implementation steps are (see Figure 10 ):

[0171] (1) First determine the operating status of the AEBS;

[0172] (2) If the running state is in the first level of alarm, then, let n=1+Tcount_W1 / t step t n-1 =Tcount_W1, then enter step (6);

[0173] (3) If the running state is in the second level of alarm, then set n=1+(Tcount_W1+Tcou...

Embodiment 3

[0192] The difference between this embodiment and Embodiment 2 is that: when the vehicle enters the secondary alarm stage and the emergency alarm stage, the Awx(t n -Tw1) deceleration curve and AEx(t n -Tw1-Tw2) The deceleration curve and the prediction algorithm in step b adopt Awx(t n -Tw1) deceleration curve and AEx(t n -Tw1-Tw2) are the same.

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Abstract

The invention relates to the field of automobile safety, and discloses a triggering method of automatic emergency braking system based on prediction, comprising methods for triggering primary alarm, secondary alarm and emergency brake, and meanwhile, the invention also discloses a movement locus predication algorithm of the current automobile and a front automobile. According to the invention, three stages after the system is started is divided according to three stages, namely, primary alarm, secondary alarm and emergency brake, according to the operation mode of the automatic emergency braking system, and meanwhile, a deceleration curve of the automatic emergency braking system is designed according to the difference of the secondary alarm manner of the system and the response characteristic of the vehicle brake system; and in the actual operation process, triggering of various difference stages of the automatic emergency braking system is realized by performing predication computation on the current vehicle and the front vehicle, and therefore, the triggering method has the advantages of being accurate and reliable in triggering, and low in erroneous judgement and missed judgement rate.

Description

technical field [0001] The invention belongs to the field of automobile safety, relates to the active collision avoidance technology of vehicles, especially trucks, and in particular relates to a method for triggering an automatic emergency braking system based on prediction. Background technique [0002] DE4101759A1 proposes an automatic braking system that includes sensors for detecting the speed and distance of the own vehicle and the target vehicle ahead. The braking system determines the collision time based on the relative speed and distance. When the driver does not step on the brake pedal, if the collision time is shorter than the preset time threshold, an alarm will be activated to prompt the driver to take action to avoid the collision. If the driver does not take any action within the specified time, the brakes will be automatically applied to reduce the speed of the vehicle to prevent a collision. The method of triggering the alarm and automatic braking proposed...

Claims

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Application Information

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IPC IPC(8): B60W50/14B60W50/16B60W30/09B60W40/105B60W40/107B60T7/12
CPCB60T7/12B60W30/09B60W40/105B60W40/107B60W50/14B60W50/16B60W2050/0043B60W2520/10B60W2520/105B60W2554/801B60W2554/804
Inventor 姜丹娜
Owner BEIJING JINWANAN AUTOMOBILE ELECTRONICS TECH RES
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