Vehicle collision early warning system based on GPS and ZigBee

Abstract

The invention discloses a vehicle collision early warning system based on GPS and ZigBee, and belongs to the technical field of assisted driving and vehicle-to-vehicle communication. The existing vehicle active collision avoidance device has the problem that the accuracy of some key parameters is low in the collision warning, and the vehicle collision avoidance system based on the vehicle-to-vehicle communication proposed by the invention can solve the above problem. The front car can pass the road gradient and the road adhesion coefficient to the rear car through V2V technology, and the rearcar can correct the safety distance model according to these, so that the accuracy and reliability of the collision early warning system can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of auxiliary driving and vehicle-to-vehicle communication. Background technique [0002] With the expansion of expressway construction scale, expressway traffic accidents also occur frequently, and most of the accident types on expressways are rear-end collision accidents. At present, the amount of information obtained by the active collision avoidance system of automobiles based on sensors such as radar and machine vision is relatively small, and it is easily affected by factors such as weather and light, which has limitations to a certain extent. [0003] With the advancement of wireless communication technology and GPS positioning technology, the vehicle early warning system based on vehicle-to-vehicle communication has been increasingly developed. Through vehicle-to-vehicle communication, vehicles can exchange their basic safety information in real time. On this basis, the early warning system of the ve...

AI Technical Summary

Problems solved by technology

[0006] At present, the more popular active collision avoidance devices based on radar and visual sensors have the following disadvantages: the safety distance model is applied to the collision warning, and the accuracy of some key parameters is low, such as the current car encounters ice, sand and stones The road surface has a certain slope, or the vehicle behind cannot predict the abnormal road conditions ahead due to the problem of sight. If the safety distance is calculated according to the current slope and adhesion coefficient, the actual safety distance should be greater than the calculated safety distance, and the calculated vehicle distance may appear. The situation is smaller than the actual safe distance, and the early warning system cannot issue an alarm, so that dangerous accidents occur

[0007] When the vehicle brakes, the road surface adhesion and the road gradient have a very large impact on the braking distance of the car. In "Vehicle Positioning and Anti-collision Warning System Based on Zigbee and GPS" (CN103117007A), a Zigbee-based and GPS-based However, the vehicle safety distance model of this system is only determined by dividing different areas according to the external environment. The vehicle safety distance model obtained by this method is not accurate, and there may be false alarms and false alarms. The invention aims at this problem and can effectively solve this problem through the proposed vehicle safety distance correction model

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