CN104442756A - Automatic warning system and method for vehicles - Google Patents
Automatic warning system and method for vehicles Download PDFInfo
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- CN104442756A CN104442756A CN201310425250.5A CN201310425250A CN104442756A CN 104442756 A CN104442756 A CN 104442756A CN 201310425250 A CN201310425250 A CN 201310425250A CN 104442756 A CN104442756 A CN 104442756A
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- vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
- B60T7/22—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle, or by means of contactless obstacle detectors mounted on the vehicle
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- Transportation (AREA)
- Mechanical Engineering (AREA)
- Traffic Control Systems (AREA)
Abstract
The invention discloses an automatic warning system for vehicles. The automatic warning system comprises a vehicle distance monitoring unit, a judging unit and a braking unit; the vehicle distance monitoring unit is used for monitoring a distance from a first vehicle to a second vehicle ahead in real time; the judging unit connected with the vehicle distance monitoring unit is used for judging whether or not the braking unit needs to be started according to distance data sent from the vehicle distance monitoring unit; the braking unit which is an eddy current retarder is used for automatically decelerating the first vehicle according to a signal sent from the judging unit.
Description
Technical field
The present invention relates to a kind of automatic early-warning system for vehicle, particularly relate to a kind of automatic early-warning and the system and method for braking.
Background technology
In vehicle travel process, need chaufeur to rely on driving experience and the skill of individual, judge the spacing of vehicle and the surrounding vehicles of driving at any time.In fact, due to the problem such as easily occur driver fatigue in vehicle travel process, divert one's attention, cause chaufeur to fail to judge following distance in time and knock into the back, the traffic accident such as collision.
The autobrake system used in prior art, when spacing detector measure in real time the speed of a motor vehicle or with the distance of front vehicles after, detector sends an electric signal to an actr, actr performs this electric signal by oil pump or air pump, brake facing to automobile performs a mechanical action, replaces chaufeur to tramp with one's feet brake facing.
The defect of prior art is, first, the response time of actr is long, and speed of response is slow, and the quality time that the mechanical action that actr internal circuit converts the electrical signal to oil pump or air pump consumes causes the braking distance of vehicle to be greater than safety distance; The second, extra actr cost is installed high in vehicle, causes this autobrake system can only carry out in luxury car, be difficult to use on the commuter vehicle such as school bus, bus higher to safety performance requirement.
Summary of the invention
In order to overcome the defect existed in prior art, the invention provides a kind of automatic early-warning system and method for vehicle, can automatic decision spacing start a brake equipment, avoid knocking into the back and the generation of collision case.
In order to realize foregoing invention object, the present invention discloses a kind of automatic early-warning system for vehicle, comprising: a spacing monitoring means, for the distance of this car of Real-Time Monitoring with front vehicles; One judging unit, this judging unit is connected with this spacing monitoring means, judges whether to need to start brake unit according to the range data that this spacing monitoring means sends; One brake unit, according to the signal that this judging unit sends, reduces this car speed of a motor vehicle automatically, and this brake unit is a current vortex retarder.
Further, this spacing monitoring means comprises a radar transmitter and receiving device.
Further, this spacing monitoring means comprises an image acquisition units, a lane detection unit, a car plate detecting unit and a treater.
Further, this spacing monitoring means comprises a satellite navigation module and a controller.
Further, this spacing monitoring means comprises RFID radio-frequency module and a controller.
The present invention discloses a kind of automatic early warning method for vehicle simultaneously, comprising: gather an image, judges whether have vehicle in this image, detects the distance of this vehicle, start a brake unit according to the distance of this vehicle, and this brake unit is a current vortex retarder.
Further, this also comprises before judging whether there is vehicle step in this image: judge whether have lane mark in this image.
The present invention also discloses a kind of automatic early warning method for vehicle, comprising: this car of Real-Time Monitoring and the distance of front vehicles, judge whether to need startup one current vortex retarder according to the range data of Real-Time Monitoring.This judges whether to need startup one current vortex retarder to comprise further according to the range data of Real-Time Monitoring: when this range data is less than or equal to first warning value, start this current vortex retarder; When this range data is greater than this first warning value and is less than or equal to the second warning value, judge whether this range data reduces according to time variations, if reduce, start this current vortex retarder.
Compared with prior art, automatic early-warning system and method used in the present invention does not need to rely on the experience of chaufeur, ability to judge spacing and the speed of a motor vehicle, also automatically can slow down the speed of a motor vehicle according to the driving situation of this car and the driving situation real-time judge of the vehicle of surrounding.Avoid because of driver personal reason (as fatigue driving, dialing mobile phone) too fast and the knocking into the back and collision case of occurring of the speed of a motor vehicle that causes.
Moreover, current vortex retarder is used as brake unit, after judging unit sends braking instruction, after not needing to convert electrical signals to a mechanical action, performs brake, directly utilize this current vortex retarder to produce a lock torque.Therefore, valuable response time has been saved.
Accompanying drawing explanation
Can be further understood by following detailed Description Of The Invention and institute's accompanying drawings about the advantages and spirit of the present invention.
Fig. 1 is the structural representation of automatic early-warning system involved in the present invention;
Fig. 2 is one of detailed description of the invention of spacing monitoring means involved in the present invention;
Fig. 3 is another embodiment of spacing monitoring means involved in the present invention;
Fig. 4 is the diagram of circuit of automatic early warning method involved in the present invention.
Detailed description of the invention
Specific embodiments of the invention are described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the structural representation of the automatic early-warning system for vehicle provided by the present invention.This automatic early-warning system comprises spacing monitoring means 100, for the distance of this car of Real-Time Monitoring with front vehicles.Judging unit 200 is connected with this spacing monitoring means 100, and whether the real time data sent according to this spacing monitoring means 100 judges from the nearest vehicle of this car within the scope of the safe driving of this car.Brake unit 300 starts according to the judged result of judging unit 200, automatically stops this car.
In a first embodiment, spacing monitoring means 100 uses trailer-mounted radar commercial measurement spacing very ripe in prior art.Trailer-mounted radar technology uses a feedway initiatively to launch infrared ray or super sonic, corresponding infrared ray or super sonic can be reflected back after infrared ray or super sonic run into object, receiving device in radar receives the infrared ray or super sonic that object reflects, thus launches infrared ray or super sonic by calculating and receive the distance that infrared ray or hypracoustic time gap or phase difference just can determine between object.If spacing monitoring means 10 records real-time spacing be less than or equal to first warning distance (as 10 meters) preset, then start current vortex retarder immediately.If if spacing monitoring means 10 records real-time spacing be greater than the first warning distance (10 meters), be less than the second default warning distance (as 30 meters) simultaneously, and this spacing monitoring means monitors change spacing temporally in reduction, then start current vortex retarder immediately.
The second embodiment of spacing monitoring means is described below with reference to Fig. 2.The principle of the spacing monitoring means used in this second embodiment is image recognition technology.Image acquisition units 101 is a camera being arranged on automobile, and this camera can be positioned at the image of vehicle front traveling-position by Real-time Collection.Whether after this image acquisition units 101 obtains image, detecting front by lane detection unit 102 has vehicle and this parking stall in same track.The specific works step of lane detection unit 102 is: scan the image data from image acquisition units 101, in this image data, select grey decision-making change violent region, change violent region from this grey decision-making that to choose grey decision-making high and have the part of elongated features, high for this grey decision-making and the paragraph width with elongated features and the standard lane live width angle value prestored are compared, if comparison result meets a parameter, then record the coordinate position of this lane mark on image data.Judge this parking stall is in which region of this lane mark, analyze in the same area whether there is an obstacle, if whether be a vehicle, if a vehicle then starts car plate detecting unit 103 if having barrier judgment.
Car plate detecting unit 103 detects this image data, determines the size of license plate image in this image.Determine that the method for the size of license plate image is utilize the features such as the edge of car plate, grey scale change and color to detect.Such as, adopt the method based on rim detection, first edge detection operator is utilized, as Canny operator, Sobel Operators etc., calculate the outline map of car plate, in this outline map, then utilize hough transform to search for the horizontal linear of two vertical projection overlaps, finally near the horizontal linear obtained, search for vertical line, thus the license plate area in the image gathered is positioned.
Treater 101, according to the size of car plate, calculates spacing.
The third embodiment of spacing monitoring means is described below with reference to Fig. 3.The principle of the spacing monitoring means used in the 3rd embodiment is RFID and Satellite Navigation Technique.
This spacing monitoring means comprises RFID radio-frequency module 202 and a satellite navigation module 203.Wherein RFID label tag 201 is installed on Ben Che and other vehicles, for sending radiofrequency signal.Be installed on RFID radio-frequency module 202 in spacing monitoring means and satellite navigation module 203 orients the distance of front vehicles and this car exactly according to radiofrequency signal or gps signal.
If the information spinner latitude and longitude information that RF receiving and transmission module receives, system, by carrying out dynamic handling to the real-time latitude and longitude information of these information and Ben Che, can obtain the up-to-date spacing information in each moment.First pair warp and weft degree information carries out form definition.Definition latitude information north latitude is " just (+) ", and south latitude is " negative (-) "; Longitude information east longitude is " just (+) ", and west longitude is " negative (-) ".The about 40008km of girth of the earth.Then mean latitude 1 degree approximates 111km greatly.The latitude and longitude information precision that native system collects is 0.0001, then every ten thousand/unit represents distance and is approximately equal to 11.1m, can meet system accuracy demand.So, model of generally finding range can be obtained:
Wherein, E1 and E2 represents the longitude information of this car and other vehicles respectively, W1 and W2 represents the latitude information of this car and other vehicles respectively, and a represents that longitude and latitude 1 ° represents length, about 1.11 × 105m.For extraordinary circumstances, such as, in east longitude 180 ° and west longitude 180 ° of border region, need convert at computing advance degree of passing through and process.The calculating of this car speed of a motor vehicle, can apply above-mentioned range finding model and draw vehicle miles of relative movement in satellite navigation chip longitude and latitude scanning period T to twice calculation of longitude & latitude that this car records, thus draw speed of a motor vehicle v.
After spacing monitoring means 100 obtains a real-time spacing information, judging unit 200 judges whether to need to start brake unit 300.In present embodiment, in judging unit 200, three kinds of spacing situations can be pre-defined, as safe distance between vehicles, without the need to starting brake unit; Early warning spacing, starts a speech prompting device; Warning car distance, sends a control signal to brake unit, starts brake unit immediately.
Brake unit 300 in present embodiment is automobile electric eddy current retarder.Current vortex retarder is a kind of auxiliary brake device for automobile.This device is arranged between automobile drive axle and change speed gear box, realizes no touch braking by electromagnetic induction principle.When automobile normal running, rotor rotates with transmission shaft, if coil leads to exciting current, several iron core just produces several magnetic field, forms electromagnetic circuit by rotor, thus makes to produce current vortex in rotor, the rotor of current-carrying is subject to the effect of power in magnetic field, its action direction is contrary with the hand of rotation of rotor, hinders the rotation of rotor, thus makes current vortex retarder produce lock torque.The lock torque that current vortex retarder produces, can be regulated by exciting current control setup.Larger by the exciting current of coil, magnetic field is stronger, and lock torque is larger.Therefore, after judging unit 200 sends a judgement signal to current vortex retarder, this current vortex retarder starts to start automatically, forms a lock torque and the automobile in traveling is slowed down rapidly even stop.
The present invention also provides a kind of spacing automatic early warning method.As shown in Figure 4, Fig. 4 is the diagram of circuit of automatic early warning method involved in the present invention.
First gather an image 402, judge whether there is lane mark 403 in this image, if enter next step, if not, return next image of 401 Resurveys.If have lane mark in image, then judge whether front has vehicle 403.This step may further include the track judging vehicle place, whether with travel in this parking stall in same track or contiguous track.If there is no vehicle in image, then return next image of 401 Resurveys.If there is vehicle in front, then detect the distance 404 of front vehicles.The method detecting vehicle distances can adopt above-mentioned image detection, RFID detection method, satellite navigation detection method etc.After spacing being detected, determine whether safe distance between vehicles 405.If be safe distance between vehicles, return next image of 401 Resurveys, if be early warning spacing, phonetic warning system can be started, if be warning car distance, then start brake system 406 immediately.
Just preferred embodiment of the present invention described in this specification sheets, above embodiment is only in order to illustrate technical scheme of the present invention but not limitation of the present invention.All those skilled in the art, all should be within the scope of the present invention under this invention's idea by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (9)
1., for an automatic early-warning system for vehicle, it is characterized in that, comprising:
One spacing monitoring means, for the distance of this car of Real-Time Monitoring with front vehicles;
One judging unit, described judging unit is connected with described spacing monitoring means, judges whether to need to start brake unit according to the range data that described spacing monitoring means sends;
One brake unit, according to the signal that described judging unit sends, reduces this car speed of a motor vehicle automatically, and described brake unit is a current vortex retarder.
2. automatic early-warning system as claimed in claim 1, it is characterized in that, described spacing monitoring means comprises a radar transmitter and receiving device.
3. automatic early-warning system as claimed in claim 1, it is characterized in that, described spacing monitoring means comprises an image acquisition units, a lane detection unit, a car plate detecting unit and a treater.
4. automatic early-warning system as claimed in claim 1, it is characterized in that, described spacing monitoring means comprises a satellite navigation module and a controller.
5. automatic early-warning system as claimed in claim 1, it is characterized in that, described spacing monitoring means comprises RFID radio-frequency module and a controller.
6. for an automatic early warning method for vehicle, it is characterized in that, comprising: gather an image, judge whether have vehicle in described image, detect the distance of described vehicle, start a brake unit according to the distance of described vehicle, described brake unit is a current vortex retarder.
7., as claimed in claim 6 for the automatic early warning method of vehicle, it is characterized in that, described judge whether there is vehicle step in described image before also comprise: judge whether have lane mark in described image.
8. for an automatic early warning method for vehicle, it is characterized in that, comprising: this car of Real-Time Monitoring and the distance of front vehicles, judge whether to need startup one current vortex retarder according to the range data of Real-Time Monitoring.
9. as described in right 8 for the automatic early warning method of vehicle, it is characterized in that, the described range data according to Real-Time Monitoring judges whether to need startup one current vortex retarder to comprise further: when described range data is less than or equal to first warning value, start described current vortex retarder; When described range data is greater than described first warning value and is less than or equal to the second warning value, judge whether described range data reduces according to time variations, if reduce, start described current vortex retarder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310425250.5A CN104442756A (en) | 2013-09-17 | 2013-09-17 | Automatic warning system and method for vehicles |
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| CN201310425250.5A CN104442756A (en) | 2013-09-17 | 2013-09-17 | Automatic warning system and method for vehicles |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105691366A (en) * | 2016-04-06 | 2016-06-22 | 天津所托瑞安汽车科技有限公司 | Intelligent automobile retarder and control method |
| CN106080592A (en) * | 2016-06-27 | 2016-11-09 | 重庆交通大学 | A kind of safe driving system based on electronic license plate and travelling-crane method |
| CN106297407A (en) * | 2015-06-11 | 2017-01-04 | 小米科技有限责任公司 | Driving safety prompt method and device based on intelligent terminal |
| CN107933427A (en) * | 2017-11-09 | 2018-04-20 | 武汉华安科技股份有限公司 | A kind of embedded oversize vehicle parking assisting system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106297407A (en) * | 2015-06-11 | 2017-01-04 | 小米科技有限责任公司 | Driving safety prompt method and device based on intelligent terminal |
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| CN106080592A (en) * | 2016-06-27 | 2016-11-09 | 重庆交通大学 | A kind of safe driving system based on electronic license plate and travelling-crane method |
| CN107933427A (en) * | 2017-11-09 | 2018-04-20 | 武汉华安科技股份有限公司 | A kind of embedded oversize vehicle parking assisting system |
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