System for preventing automobile end collision foggy day

Abstract

The invention discloses a system for preventing automobile end collision in a foggy day. The system performs heat detection on a vehicle ahead by utilizing infrared ray with infrared wavelength of 8-14mum and stronger rain and fog penetrability so as to see clearly the forward vehicle which cannot be seen or seen clearly by eyes, thus the system is particularly applicable to distance measurement of the vehicle ahead in a foggy day. In addition, the system judges the distance between the current vehicle and the vehicle ahead on the basis of distance L' when the two vehicles stop completely, namely, on the basis of the actually calculated distance between the current vehicle and the vehicle ahead and in consideration of the speeds of the current vehicle and the vehicle ahead, the complete brake distances of the current vehicle and the vehicle ahead as well as running distance within response time of a driver are calculated for judging the distance between the current vehicle and the vehicle ahead, thus obtaining more accurate normal distance or warning alarms with different urgency degrees, and avoiding automobile end collision accidents in a foggy day.

Description

technical field [0001] The invention belongs to the technical field of automobile safety, and more specifically relates to an automobile rear-end collision prevention system in foggy weather. Background technique [0002] At present, with the growth of China's economy, the number of automobiles is increasing rapidly, and the research on automobile safety is also in full swing. [0003] Rear-end collision is a common vehicle traffic accident. According to statistics, rear-end collision accounts for about 30% of total traffic accidents. There are many reasons for it, mainly including: excessive speed, fatigue driving, drunk driving, and weather conditions Therefore, it is of great significance to develop an early warning system that can monitor the environment before and after driving in real time and accurately send early warning information to the driver in real time, which is of great significance for improving driving safety and reducing traffic accidents. [0004] At pre...

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Problems solved by technology

[0014] The above-mentioned ranging technologies have their own shortcomings: ①. In the use of ultrasonic ranging, the speed of ultrasonic is greatly affected by the environment. At different temperatures, the speed of sound is different, and the change is 313m / s~349m / s, and it will change with the weather changes such as rain, fog, snow, etc., and the distance cannot be measured accurately; there is also an ultrasonic energy that is inversely proportional to the square of the distance, and its sensitivity decreases rapidly after a certain distance

②. In millisecond wave radar ranging, there are also electromagnetic interference problems, especially modern cars are equipped with various electromagnetic components, as well as mobile phones, microphones, Mp3, etc. carried by drivers, which will also cause certain problems. Impact

③. In the distance measurement of the camera system, its disadvantage is that the price is high, and at the same time, due to the constraints of software and hardware, the imaging speed is slow

④. The ideal ranging technology is laser ranging, but the current laser ranging technology only pays attention to the use of laser ranging, and the imaging laser radar must be combined with optical instruments. However, such equipment does not work well in foggy weather for the purpose of imaging

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