CN102303562A

CN102303562A - Prewarning device for preventing rear-end collision of automobiles

Info

Publication number: CN102303562A
Application number: CN2011101662316A
Authority: CN
Inventors: 徐洁纯
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-11-11
Filing date: 2011-06-09
Publication date: 2012-01-04

Abstract

The invention discloses a prewarning device for preventing rear-end collision of automobiles. The device comprises a distance measurement device, a central control device, a front alarm device, a rear alarm device and a central control device; the distance measurement device is arranged on the tail of an automobile to measure the distance between the automobile and an automobile behind the automobile; the front alarm device is arranged in an automobile cab; the rear alarm device is arranged on the rear part of the automobile and faces the rear part; and the central control device reads data of the distance measurement device, performs calculation and judgment according to set and judgment methods and controls the work of the front alarm device and the rear alarm device. When the rear-end danger of the automobiles exists, front and rear alarm is given out to remind the divers of the automobiles of taking measures to prevent rear-end collision. The speed of the automobiles is not needed to be measured directly, the prewarning device is easy and convenient to install and the work reliability is improved.

Description

The prior-warning device that the anti-back of a kind of automobile car knocks into the back

Technical field the present invention relates to a kind of automobile early warning electronics package that belongs to electronic technology field.

Background technology is on express highway, and knocking into the back collides is the normal traffic accident that takes place, and its reason generally is that the back car speed is too fast, brake not as good as and knock preceding vehicle.As chaufeur, you can accomplish to have only careful driving, avoid knocking the fwd vehicle, can't avoid back vehicle to hit you, though responsibility in the back car, but the injures and deaths that accident produces are who is unwilling to see with loss.And when allowing chaufeur drive while seeing that the front will notice constantly that also the back is obviously also unrealistic.Existing technology only prevents that you from removing to hit the fwd vehicle, and does not solve this problem of being collided by the back vehicle rear-end collision.

Summary of the invention the present invention seeks to disclose a kind of can knocking into the back to the back car and carries out the electronics package of early warning.

The present invention includes distance measuring equipment (DME), centralized control device and preceding warning device, it is characterized in that the tailstock that distance measuring equipment (DME) is installed in automobile with the distance of measured automobiles with the back vehicle, preceding warning device is installed in that vehicle drive is indoor to be used to remind chaufeur; Also include and be installed in the automobile back and towards the back warning device at rear, being used for rearwards, vehicle sends alerting signal; The centralized control device reads the data of distance measuring equipment (DME), carries out computational discrimination according to calculating and the decision method set, and the work of preceding warning device of control and back warning device.

Calculating and decision method that described centralized control device is set are: the centralized control device every at a distance from a period of time T read just that distance measuring equipment (DME) exports follow the back vehicle apart from S; Former and later two are compared apart from S1 and S2, calculate the difference DELTA S=S1-S2 of distance; If this numerical value is for just, promptly distance is diminishing, then judge the back car near Ben Che and back vehicle speed greater than this car, again with Δ S divided by period of time T, draw numerical value Δ V=Δ S/T; This numerical value also is Δ V=Δ S/T=(S1-S2)/T=S1/T-S2/T, and Δ V promptly is the velocity contrast of two cars; Will the back one apart from S2 divided by velocity contrast Δ V, just obtain time t=S2/ Δ V, time t promptly is the collision time that two cars will bump against under current state; Set the t value of a safety, as the time t that collides during less than setting value, just judging has the danger of knocking into the back and colliding, and before the control warning device with after warning device send warning.

The present invention monitors the distance of this car and back vehicle under steam, and calculates the velocity contrast of two cars with this, when the distance of two cars is too little with the ratio of the velocity contrast of two cars, when knock into the back dangerous arranged, gives the alarm and reminds this car chaufeur to take measures to prevent to collide; Make the back warning device that is installed in the automobile back send the light warning signal simultaneously, remind the chaufeur of back vehicle to note taking measures, owing to all carry out warning reminding for the chaufeur of two cars, can reach and better prevent the effect of colliding.And its mode of operation so installation is more simple and convenient, has also improved the reliability of work owing to need not directly to measure the speed of this car or back car.

Description of drawings Fig. 1 is a principle of work block scheme of the present invention.

Fig. 2 is the present invention's scheme of installation on automobile when using.

With reference to the accompanying drawings, embodiments of the invention are described below the specific embodiment.

Among Fig. 1; Distance measuring equipment (DME) CS can adopt ultrasonic measuring distance technology; This belongs to the ripe prior art of electronic technology field; On the reversing radar of vehicle on the market; Just can the digital mode of exporting directly show measured distance, so do not do narration here for the principle of work and the circuit of ultrasonic ranging.

The present invention is installed in the ultrasonic ranging probe afterbody of automobile; Position such as similar radar for backing car; Be used to measure the distance of this car with the back vehicle; And be connected to data I/O mouth of center processing circuit MCU of the present invention by data-interface; The center processing circuit can be made up of single-chip microcomputer; Not have specific (special) requirements of MCU can be adopted model commonly used; Other I/O mouths of MCU are as the indication and the output of reporting to the police; Carry out the power amplification rear drive through overdrive circuit and be installed in tailstock warning device and be installed in the work of the preceding warning device of driver's cabin behind the back; Preceding warning device comprises alarm lamp L1 and alarming horn SP; Remind this car driver to note during warning, take measures to prevent that such as quickening the back car from knocking into the back.An innovative point of the present invention; Be that the back warning device of reminding the back vehicle driver is installed; Back warning device can be made up of the back alarm lamp L2 that many high-brightness LEDs are formed; Car is installed in the afterbody of automobile, if also can be installed in the inside of automobile rear seat windscreen and towards the back, when MCU sends actuation of an alarm; Back alarm lamp L2 sends flicker simultaneously and reports to the police; Remind the chaufeur of back vehicle to note, take measures, better play the effect of knocking into the back and colliding of preventing.、

The principle of work of MCU program when introducing the present invention below and working.During work; Single-chip microprocessor MCU whenever at a distance from a period of time T such as just sending an instruction in 1 second; Control supersonic range finder work measurement with the back vehicle apart from S; And read this range data from data-interface; Through comparison to former and later two range data S1 and S2; Draw the poor Δ S=S1-S2 of distance, again with Δ S divided by period of time T, can draw the velocity contrast Δ V=Δ S/T of two cars.Obviously, if Δ V is 0, then the speed of two cars equates, promptly what new situation can not take place, at this moment the single-chip microprocessor MCU signal that will not give the alarm; If Δ V promptly has S2＞S1 for what bear, the distance of the 2nd measurement illustrates then that greater than the distance of the 1st measurement the distance of two cars is becoming big, and it is slower than this car that back vehicle walks, and this obviously also is safe, and at this moment MCU can not send alerting signal yet; And as the Δ V that calculates when being positive; S2＜S1 is promptly arranged; The distance that two cars is described is diminishing; Because just tens meters of the measuring distance maximums of general supersonic range finder; Get into the vehicle in this distance range, if having S2＜S1 promptly distance then be necessary to remind chaufeur to note also reducing; So at this moment MCU can send signal and opens caution indicator lamp L1 and do slow flicker, reminds chaufeur to notice that back vehicle is near this car.At this moment MCU also will calculate the ratio of S2/ Δ V simultaneously; The meaning of the ratio of S2/ Δ V promptly is under the situation according to existing distance and speed difference; Back vehicle knocks into the back and knocks the time of this car; The numerical value of this ratio is less; (such as less than 3 seconds); Promptly mean the collision of can knocking into the back very soon in this case of two cars; Then MCU can drive alarm lamp L2 again and send quick flash of light; And driving alarming horn SPK sends chimes of doom; Strong alerting driver; Notice that back vehicle has had the danger that this car is caused the collision of knocking into the back, make the driver can in time take measures to avoid accident to take place.Also will drive back alarm lamp L3 simultaneously and send fast blink, back car chaufeur will be warned.

The present invention adopts with period of time T and constantly measures the distance with the back vehicle; Through twice result of a measurement S1 in front and back and S2; Calculate Δ S and come directly to obtain the velocity contrast Δ V of two cars through Δ S/T; And need not detect the speed of automobile; So with automobile mechanical connection need not take place, install more simple and convenient.

Claims

1. an automobile is prevented the prior-warning device that the back car knocks into the back; Include distance measuring equipment (DME), centralized control device and preceding warning device; It is characterized in that: distance measuring equipment (DME) is installed in the tailstock of automobile with the distance of measured automobiles with the back vehicle, and it is indoor that preceding warning device is installed in vehicle drive; Also include and be installed in the automobile back and towards the back warning device at rear; The centralized control device reads the data of distance measuring equipment (DME), carries out computational discrimination according to calculating and the decision method set, and the work of preceding warning device of control and back warning device.

2. the prior-warning device that the anti-back of a kind of automobile according to claim 1 car knocks into the back is characterized in that calculating and decision method that described centralized control device is set are: the centralized control device every at a distance from a period of time T read just that distance measuring equipment (DME) exports follow the back vehicle apart from S; Former and later two are compared apart from S1 and S2, calculate the difference DELTA S=S1-S2 of distance, if this numerical value for just, promptly distance is diminishing, then judge the back car near Ben Che and back vehicle speed greater than this car; Again with Δ S divided by period of time T, draw numerical value Δ V=Δ S/T, Δ V promptly is the velocity contrast of two cars; Will the back one apart from S2 divided by velocity contrast Δ V, obtain time t=S2/ Δ V, time t promptly is the collision time that two cars will bump against under current state; Set the t value of a safety, as the time t that collides during less than setting value, just judging has the danger of knocking into the back and colliding, and before the control warning device with after warning device send warning.

3. the prior-warning device that the anti-back of a kind of automobile according to claim 2 car knocks into the back; It is characterized in that: before sending warning; If the numerical value of the Δ S=S1-S2 that is obtained is for just; Then judging has back car near Ben Che and afterwards vehicle speed is greater than this car, and the centralized control device sends indicative warning in advance.