Automobile rear collision early warning system and method based on visible light communication

Abstract

The invention discloses an automobile rear collision early warning system and method based on visible light communication. The automobile rear collision early warning system comprises a positioning module, an MCU, a light communication modulation module, a photosensitive receiver and an HMI system; the positioning module (b),( / b) a light communication modulation, a photosensitive receiver and the HMI system are respectively connected to the MCU; and the LED lamp is connected to the light communication modulation modules. The invention also discloses an automobile rear collision early warning method based on the visible light communication. The automobile rear collision early warning method comprises: the automobile rear collision early warning systems based on visible light communication are installed on a preceding vehicle and on a rear vehicle approaching vehicle; the rear approaching vehicle adopts an initiative mode to transmit information to the preceding vehicle to enable the preceding vehicle to obtain more state information of the rear approaching vehicle in order to guarantee accuracy of the preceding vehicle rear collision early warning; and besides, the preceding vehicle rear collision early warning can adopt a suitable TTC threshold value according to the vehicle model of the rear approaching vehicle to make determination accurate.

Description

Technical field [0001] The invention belongs to automobile electronic control technology, in particular to an automobile rear-end collision warning system and method based on visible light communication. Background technique [0002] Rear-end collision accident is the most representative accident form among automobile driving accidents. In my country, the rear-end collision accident rate accounts for about 1 / 3 of the total traffic accident rate, causing huge casualties and economic losses. In order to reduce the accident rate of rear-end collisions and improve the safety performance of vehicles, rear-end collision warning systems are more and more widely used in automobiles. When potential rear-end collision risks occur, rear-end collision warnings are provided to vehicles so that drivers can take measures such as acceleration and steering in time. To avoid rear-end collision or reduce damage. [0003] Existing rear-end collision warning systems are generally radar-based re...

AI Technical Summary

Problems solved by technology

However, the radar-based rear-end collision warning system adopts the method of active detection, which can only detect the distance and speed information of the approaching vehicle at the rear, and cannot obtain more information about the approaching vehicle at the rear, so it is impossible to dynamically set the TTC according to the rear vehicle model more reasonably. Thresholds and alarm time points

[0006] (2) The radar-based rear-end collision warning system can only detect vehicles directly behind the vehicle, see Figure 4 , in the case of a curve, the vehicle 12 in the adjacent lane is detected by the radar wave 13 of the vehicle 10, and it is easy to generate a false alarm for the vehicle in the adjacent lane; 13 is detected, there is a potential rear-end collision risk that is missed

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