CN107187384A - A kind of automobile front-and-rear vehicle distance monitoring and warning system - Google Patents
A kind of automobile front-and-rear vehicle distance monitoring and warning system Download PDFInfo
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- CN107187384A CN107187384A CN201710315655.1A CN201710315655A CN107187384A CN 107187384 A CN107187384 A CN 107187384A CN 201710315655 A CN201710315655 A CN 201710315655A CN 107187384 A CN107187384 A CN 107187384A
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- monitoring
- convex lens
- line
- distance
- warning system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
- B60Q9/008—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for anti-collision purposes
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- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Mechanical Engineering (AREA)
- Traffic Control Systems (AREA)
Abstract
Existing low speed CAS is used only for moving backward and parked, and can only measure rear large volume barrier to the distance of car body, the situation that automobile is run at a low speed on crowded road is not considered.Meanwhile, the cost of current low speed CAS is higher, is mostly used for medium-to-high grade car, fails to be popularized on low-grade car.The present invention discloses a kind of automobile front-and-rear vehicle distance monitoring and warning system.The system cost is cheap, can in real time, reliable monitoring when driving vehicle movement with front and back garage away from size and timely pre-warning system.Compared with orthodox car CAS, the present invention utilizes convex lens imaging principle, optical lens imaging and electronic monitoring treatment technology are combined, on the premise of versatility, low cost is ensured, reached that real-time, reliable monitoring drives vehicle and spacing and the requirement of early warning of its front and rear automobile.
Description
Technical field
The present invention relates to optics, electronic measurement and control technical field, more particularly to a kind of automobile front-and-rear vehicle distance monitoring and warning system
System.
Background technology
With the development of social economy, increasing people has private car, but the development speed of town road is delayed
In the growth rate of automobile, urban traffic is further crowded；Part driver's driving technology is unskilled, knocks into the back, wipes and the automobile thing such as touch
Therefore incidence increases year by year, the urban congestion section of peak period especially on and off duty, it is more universal that low speed wipes situation about touching.It is led
It is that vehicle is more, signal lamp change is frequent, driver's seat is bad, causes driver to be difficult to prejudge front and back vehicle to want reason
Motion change situation, it is impossible to by naked eyes accurately judge the distance between vehicle；Simultaneously as the outward appearance of different type automobile
It is different with performance, further increase the difficulty of separation between vehicles estimation.
If before accident generation, driver can be reminded in time, and be taken appropriate measures, most of
Traffic accident can just be avoided.Therefore, as the vehicle collision avoidance system of one of active vehicle security system by the country
The great attention of outer automotive research personnel.Car collision avoidance System is that one kind can send audiovisual alert signal in advance to driver
Detection device.It is arranged on automobile, can detect the pedestrian close to automobile, vehicle or peripheral obstacle, and to driver with
Occupant sends the signal for the danger that will collide in advance, promotes driver to take emergency measures to deal with special hazard, avoids
Loss.
Existing low speed CAS is mainly used in moving backward and parked, can only measure rear large volume barrier to car body away from
From not considering the situation that automobile is run at a low speed on crowded road.Meanwhile, current low speed CAS cost is higher, mostly
For medium-to-high grade car, fail to be popularized on low-grade car.
The content of the invention
It is an object of the invention to provide one kind is with low cost, when driving vehicle movement and front and back can in real time, be reliably monitored
Garage away from size and in time pre-warning system.
To realize that the technical scheme that the object of the invention is used is a kind of such, automobile front-and-rear vehicle distance monitoring and warning system
System, it is characterised in that:Including image-forming module, sensor assembly, signal processing module and alarm module；
The image-forming module includes convex lens and receiving screen；The distance between the convex lens and receiving screen are fixed as image distance
v；The convex lens are variable object distance with the distance between front truck or the license plate of rear car, and safe object distance is u；Jiao of convex lens
Away from for f；
According to the wrongly written or mispronounced character and the size of surplus on the license plate, setting wrongly written or mispronounced character detection height is Wb, surplus detection height
For Wh；Corresponding wrongly written or mispronounced character image height isCorresponding surplus image height is
The sensor assembly includes two black and white line detection sensors；The receiving screen is parallel to focal plane；It is described to connect
Receive and there is one and the orthogonal horizontal reference line of convex lens primary optical axis on screen；Exist on the receiving screen and join parallel to level
Examine the monitoring line I and monitoring line II of line；The distance between the monitoring line I and reference line are Xb/2, the monitoring line II and ginseng
The distance between line is examined for Xh/2；The boundary of one of black and white line detection sensor monitoring white line is monitoring line I, another
The boundary of black and white line detection sensor monitoring black line is monitoring line II；
The signal processing module includes a single-chip microcomputer；After black and white line detection sensor monitors black and white line, Xiang Xin
Number processing module transmission signal；The signal processing module control alarm module sends alarm signal.
Compared with orthodox car CAS, the present invention utilizes convex lens imaging principle, by optical lens imaging and electronics
Monitoring treatment technology is combined, on the premise of versatility, low cost is ensured, reached in real time, reliable monitoring drive vehicle with
The spacing of its front and rear automobile and the requirement of early warning.
Further, the safe object distance is 2 times of focal lengths that u is more than convex lens.
Further, the image distance v is more than the focal length of convex lens, less than 2 times of focal lengths of convex lens.
Further, two monitoring and warning systems for being used to monitor front truck spacing are installed at headstock；It is convex in the two systems
The terrain clearance h at the center of lens is respectively 93cm and 54cm, its actually detected altitude range be respectively 93 ± 10cm and 54 ±
10cm。
Further, a monitoring and warning system for being used to monitor rear car spacing is installed at the tailstock；In this system, convex lens
The terrain clearance h at the center of mirror is 47cm, and its actually detected altitude range is 47 ± 10cm.
The solution have the advantages that unquestionable：According to optical lens image-forming principle, by characters on license plate be imaged it is big
The small foundation far and near as fore-aft vehicle spacing is weighed, and the information for being imaged size is converted into by telecommunications by photosensitive sensor
Number, it is determined that the characteristic parameter in input single-chip microcomputer, and pair set up between varying input signal and the too small situation of different spacings
It should be related to.The present invention can monitor the spacing change for driving vehicle and its fore-aft vehicle in real time, when spacing is too small, can be timely, accurate
Really send warning signal, promote driver to make more rational judgement, accident is avoided to greatest extent.
Brief description of the drawings
Fig. 1 is a kind of flow chart of automobile front-and-rear vehicle distance monitoring and warning system of the present invention.
Fig. 2 is a kind of optical monitoring module principle figure of automobile front-and-rear vehicle distance monitoring and warning system of the present invention.
Fig. 3 is a kind of optics receiving screen front schematic view of automobile front-and-rear vehicle distance monitoring and warning system of the present invention.
Fig. 4 is a kind of electronic hardware workflow diagram of automobile front-and-rear vehicle distance monitoring and warning system of the present invention.
Fig. 5 is a kind of electronics warning module schematic diagram (the input letter of automobile front-and-rear vehicle distance monitoring and warning system of the present invention
Number representative sensor).
Fig. 6 is that a kind of device of automobile front-and-rear vehicle distance monitoring and warning system of the present invention is installed on the signal of vehicle front and back position
Figure.
Fig. 7 is a kind of black and white line detection sensor TK-20 wiring of automobile front-and-rear vehicle distance monitoring and warning system of the present invention
Figure.
In figure：A is that receiving screen, B are that convex lens, C are font on license plate, and D is font (real image) on receiving screen, ck
For reference line, I be monitor line I, II be monitor monitoring height, monitoring that b is car plate surplus height that line II, a are car plate wrongly written or mispronounced character,
F1-f6 be the input signal of 6 sensors in equipment, D1-D4 be different spacings excessively nearly situation when indicator lamp.
Embodiment
With reference to embodiment, the invention will be further described, but should not be construed above-mentioned subject area of the invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, all should be included within the scope of the present invention.
A kind of automobile front-and-rear vehicle distance monitoring and warning system, it is characterised in that:Including image-forming module, sensor assembly, signal
Processing module and alarm module；
The image-forming module includes convex lens and receiving screen；The distance between the convex lens and receiving screen are fixed as image distance
v；The convex lens are variable object distance with the distance between front truck or the license plate of rear car, and safe object distance is u；It can determine
, vehicle in the process of moving, particularly when running at a low speed and the minimum safe distance of fore-aft vehicle is about 2 meters, i.e. u=
2m；
, can be by minimum safe distance and characters on license plate size, to determine character by convex lens imaging principle in optics
The limit size of imaging, thereby determines that the scope of black and white line detection sensor monitoring.By lens formulaTry to achieve permission
Image distance v when front-and-rear vehicle distance is minimum, thus also determines receiving screen apart from the position of convex lens, is obtained further according to statistics before
Characters on license plate size is high as thing, with reference to formulaThe maximum of the image height on receiving screen is tried to achieve, in this, as
The monitoring range of black and white line detection sensor.
Specifically, the car plate of the vehicle such as China's civil car and SUV is blue bottom wrongly written or mispronounced character, and this height of car plate 140mm is wide
The wide 45mm of the high 90mm of 440mm, wrongly written or mispronounced character, and self-consistentency；Before the car plate of the vehicles such as loading, passenger car is yellow bottom black, automobile
The portion wide 440mm of this height of car plate 140mm, the wide 45mm of the high 90mm of surplus, the wide 440mm of automobile rear this height of car plate 220mm, surplus
The high wide 65mm of 110mm.Then in figure 3, the scope of measurement different colours font is different (b>A), as in Fig. 5, install
6 black and white line detection sensors before and after automobile are different for the reaction of different fonts, are corresponded respectively to and single-chip microcomputer
6 input signal f1-f6 of connection, are represented and the compact car spacing of Chinese herbaceous peony is excessively near and Chinese herbaceous peony respectively by tetra- LED of D1-D4
Large car spacing it is excessively near, with the compact car spacing after car it is excessively near and with the excessively nearly four classes situation of the large car spacing after car, and
Loudspeaker can be controlled to send different warnings so as to corresponding with LED by the output signal of different frequency.Different cars can be differentiated whereby
Type and fore-and-aft direction.
In Fig. 6, automotive front is different with the mounting means of automobile rear device main by the optimal observation position of the present embodiment
Determine, it is seen that car plate lower end is away from ground level before and after the common vehicle types of table 1
Car plate lower end is away from ground level (unit cm) before and after the common vehicle types of table 1
Other vehicle rear car plates should be surveyed for driving front part of vehicle device, and other cars should be surveyed by driving vehicle rear device
Front license plate, it is highly about 45cm and 80cm that can obtain automobile rear car plate with rough Statistics from table, and automotive front car
Board is highly about 40cm, in conjunction with the height of car plate in itself before and after different type vehicle, on the premise of certain error is considered, is
Allow the center of device camera lens directly to correspond to the center for being observed object, the optimal observation position installation such as Fig. 6 is finally determined
Scheme.I.e. in embodiment, two monitoring and warning systems for being used to monitor front truck spacing are installed at headstock；In the two systems,
The terrain clearance h at the center of convex lens is respectively 93cm and 54cm, image-forming principle based on convex lens and at the signal of single-chip microcomputer
Function is managed, the actually detected scope of the two systems is respectively 93 ± 10cm and 54 ± 10cm.Installing one at the tailstock is used for
Monitor the monitoring and warning system of rear car spacing；In this system, the terrain clearance h at the center of convex lens is 47cm, based on convex lens
The image-forming principle of mirror and the signal processing function of single-chip microcomputer, the actually detected scope of the system is 47 ± 10cm.
In summary, in embodiment, the focal length of convex lens is f=2.8mm；Image distance v=2.804mm.According to the car plate
According to upper wrongly written or mispronounced character and the size of surplus, determine that wrongly written or mispronounced character detection height is Wb=90mm.Due to the font size of front and rear yellow car plate
Differ, therefore, surplus detection height is Wh=90mm (when system is installed on headstock) or 110mm (when system is installed on the tailstock)；
Corresponding wrongly written or mispronounced character image height isCorresponding surplus image height is
It is generally yellow bottom surplus and blue bottom wrongly written or mispronounced character or white with black that car plate can must be had in the statistics of common vehicle types car plate
Word, according to this selection can accurately distinguish black-white colors and be disturbed the simple black and white line detection of small, process signal to sense by visible ray
Device TK-20 is used as detection of electrons part；Therefore, the sensor assembly includes two black and white line detection sensors；It is described to receive
Screen is parallel to focal plane；There is the reference line of a level, the primary optical axis phase of this reference line and convex lens on the receiving screen
It is mutually vertical (can be the center line of receiving screen)；There is the monitoring line I and monitoring line II parallel to reference line on the receiving screen；Institute
It is Xb/2 to state the distance between monitoring line I and reference line, and the distance between the monitoring line II and reference line are Xh/2；Wherein one
The boundary of individual black and white line detection sensor monitoring white line is monitoring line I, another black and white line detection sensor monitoring black line
Boundary is monitoring line II；
The signal processing module includes a single-chip microcomputer；After black and white line detection sensor monitors black and white line, Xiang Xin
Number processing module transmission signal；The signal processing module control alarm module sends alarm signal.I.e. when spacing reaches minimum
During safe distance, black and white line detection sensor monitors black line/white line of characters on license plate, corresponding high/low level is sent, with this
Carry out the I/O mouth input signals to single-chip microcomputer, and error is reduced by the programing function of single-chip microcomputer, it is ensured that in most cases may be used
To accomplish that control LED, buzzer or voice module send warning signal when spacing is less than 2m.Point out to drive by sound and light signal
The person's of sailing spacing is too small, reaches early warning purpose.And different voice signals can be anti-respectively with different light emitting diodes
It should drive before or after vehicle and with different type car plate garage away from too small all kinds of situations, help driver timely, clear
Ground is judged.
Claims (5)
1. a kind of automobile front-and-rear vehicle distance monitoring and warning system, it is characterised in that:Including the image-forming module, sensor assembly, letter
Number processing module and alarm module；
The image-forming module includes convex lens and receiving screen；The distance between the convex lens and receiving screen are fixed as image distance v；Institute
It is variable object distance that convex lens, which are stated, with the distance between front truck or the license plate of rear car, and safe object distance is u；The focal length of convex lens is
f；
According to the wrongly written or mispronounced character and the size of surplus on the license plate, setting wrongly written or mispronounced character detection height is that Wb, surplus detection height are Wh；
Corresponding wrongly written or mispronounced character image height isCorresponding surplus image height is
The sensor assembly includes two black and white line detection sensors；The receiving screen is parallel to focal plane.The receiving screen
It is upper to there is one and the orthogonal horizontal reference line of convex lens primary optical axis；Exist on the receiving screen parallel to horizontal reference line
Monitoring line I and monitoring line II；The distance between the monitoring line I and reference line are Xb/2, the monitoring line II and reference line
The distance between be Xh/2；The boundary of one of black and white line detection sensor monitoring white line is monitoring line I, another black and white
The boundary of line detection sensor monitoring black line is monitoring line II；
The signal processing module includes a single-chip microcomputer；After black and white line detection sensor monitors black and white line, at signal
Manage module transmission signal；The signal processing module control alarm module sends alarm signal.
2. a kind of automobile front-and-rear vehicle distance monitoring and warning system according to claim 1, it is characterised in that：The safe thing
Away from 2 times of focal lengths for being more than convex lens for u.
3. a kind of automobile front-and-rear vehicle distance monitoring and warning system according to claim 1 or 2, it is characterised in that：The image distance v
More than the focal length of convex lens, less than 2 times of focal lengths of convex lens.
4. a kind of automobile front-and-rear vehicle distance monitoring and warning system according to claim 1 or 3, it is characterised in that：At headstock
Two monitoring and warning systems for being used to monitor front truck spacing are installed；In the two systems, the center terrain clearance h difference of convex lens
For 93cm and 54cm, its actually detected altitude range is respectively 93 ± 10cm and 54 ± 10cm.
5. a kind of automobile front-and-rear vehicle distance monitoring and warning system according to claim 1 or 3, it is characterised in that：At the tailstock
One monitoring and warning system for being used to monitor rear car spacing is installed；In this system, the center terrain clearance h of convex lens is
47cm, its actually detected altitude range is 47 ± 10cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710315655.1A CN107187384B (en) | 2017-05-08 | 2017-05-08 | A kind of automobile front-and-rear vehicle distance monitoring and warning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710315655.1A CN107187384B (en) | 2017-05-08 | 2017-05-08 | A kind of automobile front-and-rear vehicle distance monitoring and warning system |
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| CN107187384A true CN107187384A (en) | 2017-09-22 |
| CN107187384B CN107187384B (en) | 2018-08-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107622500A (en) * | 2017-09-29 | 2018-01-23 | 吉林大学 | A kind of the heavy goods vehicles rearward collision method for early warning and its device of view-based access control model sensing |
| CN107945575A (en) * | 2017-11-20 | 2018-04-20 | 深圳市中通视际实业有限公司 | A kind of device for monitoring vehicle and its method |
| CN108791051A (en) * | 2018-05-17 | 2018-11-13 | 深圳职业技术学院 | A kind of automobile intelligent monitor control system |
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| CN107622500A (en) * | 2017-09-29 | 2018-01-23 | 吉林大学 | A kind of the heavy goods vehicles rearward collision method for early warning and its device of view-based access control model sensing |
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| CN107187384B (en) | 2018-08-03 |
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