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

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

Examples

Experimental program
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Example Embodiment

[0101] Example 1

[0102] The overall idea of ​​the present invention is: the automatic emergency braking device of the present invention has a two-level alarm according to the state relationship between the vehicle and the preceding vehicle. After the second-level alarm, if the driver still does not perform subjective collision avoidance, it will start Emergency braking until the danger of collision disappears. The first level alarm is an audible and visual alarm, which does not cause any acceleration or deceleration operations on the vehicle; the second level alarm adds a tactile alarm on the basis of the first level alarm, which is divided into two forms: no automatic braking and automatic braking , The tactile alarm for not performing automatic braking can be steering wheel vibration, seat belt tension or seat vibration, etc.; for the tactile alarm for performing automatic braking, the form of active point braking or slow braking is adopted. In order to be able to leave suff...

Example Embodiment

[0169] Example 2

[0170] The difference between this embodiment and the first embodiment is that the prediction algorithm of the vehicle and the preceding vehicle mentioned in the above three exit conditions, where the prediction algorithm of the preceding vehicle is consistent with the algorithm in the trigger step, the prediction algorithm of the vehicle According to the different operating states of the vehicle, there is a certain difference from the algorithm in the triggering step. The main reason is to redesign the vehicle prediction algorithm for unified calculation. The implementation steps are (see Picture 10 ):

[0171] (1) First determine what operating state AEBS is in;

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

[0173] (3) If the running state is in the second-level alarm, let n=1+(Tcount_W1+Tcount_W2) / t step ,

[0174] t n-1 =Tcount_W1+Tcount_W2, then go to step (6);

[0175] (4) If t...

Example Embodiment

[0191] Example 3

[0192] The difference between this embodiment and the second embodiment 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 use 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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