CN104112359B - A kind of type of vehicle based on bias magnetic field, speed detector - Google Patents
A kind of type of vehicle based on bias magnetic field, speed detector Download PDFInfo
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Abstract
The present invention relates to a kind of type of vehicle based on bias magnetic field, speed detector and method of work, comprise: magnetic bias generating means, for generation of the bias magnetic field that a space distribution is stable, and the loop direction of circling that the magnetic line of force of this bias magnetic field is formed is consistent with direction, track, and cover this track; Magnetic perception component, is positioned in described bias magnetic field, and receiving target vehicle enters the magnetic disturbance signal that described bias magnetic place produces; Storage unit, stores type of vehicle feature database; Processor module, is connected with this storage unit, is suitable for the magnetic disturbance signal processing the reception of described magnetic perception component; That is, described processor module is converted to the pulse signal corresponding with described target vehicle this magnetic disturbance signal, and its pulse height is the amplitude average value of this magnetic disturbance signal; Pulse height in described pulse signal and described type of vehicle feature database contrasts by described processor module, can obtain the type of this target vehicle.
Description
Technical field
The present invention relates to a kind of type of vehicle and velocity measuring field, particularly relate to a kind of type of vehicle based on magnetic bias and speed detector and method of work.
Background technology
Geomagnetic sensor, relative to ground induction coil, is subject to extensive concern as a kind of vehicle detecting sensor with the obvious advantage in Traffic monitoring field and is sent to hope.Special in the Internet of Things epoch, geomagnetic sensor extensively in the application of Traffic monitoring network facet, has a extensive future.Although from last century Mo micro fluxgate sensor and magnetoresistive transducer AMR occur after, there is longer a period of time in the vehicle sensors based on earth magnetism, but still fail so far to be used widely, one of the main reasons is, earth magnetism is a kind of constant direction magnetic field, point to north, therefore Magnetic Sensor has maximum detected value in North and South direction on earth's surface by south, and detected parameters will change when applying in other direction, consistent testing result cannot be obtained.In the use of therefore Magnetic Sensor, optimum condition is that perceptual axes direction and road direction are consistent with North and South direction.In Traffic monitoring, real road trend varies, in this practical application, the diversity of road direction and desirable fixed-direction apply larger distance, geomagnetic sensor is caused to be difficult to form consistent detected parameters, this very unfavorable to the large-scale production of sensor.Geomagnetic sensor is weak magnetic sensor on the other hand, is approximately operated in and is less than 1Gs(1 × 10
-4tesla) scope in.Terrestrial magnetic field is about about 0.5 ~ 0.6Gs in China's latitude, the complementary field that vehicle induced magnetism place obtains is between several milligauss to tens milligauss, this faint magnetic signal is subject to the interference of ferromagnetic material around, as underground reinforced, hurdle, road around, or the impact of the iron plate on road, screw etc., this makes geomagnetic sensor be restricted when in the face of complicated applications environment.In addition, the principle of work of current geomagnetic sensor, mostly based on amplitude detection, namely utilizes the size of magnetic signal amplitude to judge that vehicle exists.This is that Magnetic Sensor application is subject to one of immanent cause of direction restriction and magnetic environment restriction.This working method is relatively simple for structure, easily realizes, but this mode is except bringing above listed problem, does not fully excavate the physical characteristics of vehicle magnetic signal, cannot obtain the fundamental issue that consistent testing result is such geomagnetic sensor.In addition, this vehicle checking method only can carry out the detection of vehicle existence, cannot carry out type of vehicle detection, also cannot carry out velocity measuring.Carry out vehicle speed detection and must use two sensors, this scheme that tests the speed realizes in technology and all can not be satisfactory in practical application.
Summary of the invention
The technical matters that the present invention primarily solves is to provide a kind of vehicle detection apparatus being suitable for accurately judging type of vehicle based on bias magnetic field; Secondly, the technical matters for vehicle speed measuring to also be solved.
In order to solve the problems of the technologies described above, the invention provides a kind of vehicle detection apparatus, comprising:
Magnetic bias generating means, for generation of the bias magnetic field that a space distribution is stable, and the loop direction of circling that the magnetic line of force of this bias magnetic field is formed is consistent with direction, track, and covers the superjacent air space in this track;
Magnetic perception component, is positioned in described bias magnetic field, and receiving target vehicle enters the magnetic disturbance signal that described bias magnetic place produces;
Storage unit, stores type of vehicle feature database;
The method obtaining described type of vehicle feature database is: when all types of vehicle respectively from described bias magnetic field through out-of-date, described magnetic perception component receive described vehicle produce magnetic disturbance signal; Convert each magnetic disturbance signal to the pulse waveform corresponding with the type of described vehicle, the amplitude of this pulse waveform is determined by the amplitude average value of described magnetic disturbance signal; Each pulse waveform that the type of thus obtained and described vehicle is corresponding, namely forms described type of vehicle feature database;
Processor module, is connected with this storage unit, is suitable for the magnetic disturbance signal processing the reception of described magnetic perception component; That is, described processor module is converted to first pulse signal corresponding with described target vehicle this magnetic disturbance signal, and its pulse height is the amplitude average value of this magnetic disturbance signal;
Pulse height in described first pulse signal and described type of vehicle feature database contrasts by described processor module, can obtain the type of this target vehicle.
Further, in order on the basis of measuring vehicle type to detection the speed of a motor vehicle, also comprise the corresponding relation of type of vehicle and vehicle commander in described type of vehicle feature database, that is, know target vehicle commander by target vehicle type;
Described processor module is suitable for determining pulse width according to the duration of described magnetic disturbance signal, by calculating the ratio of this target vehicle commander and pulse width, obtains target vehicle speed.
Further, in order to improve intensity and the directivity of bias magnetic field, namely produce the stable non-uniform stable magnetic field of a distribution along road direction; Described magnetic bias generating means comprises: permanent magnet, first, second magnetic conductor, and the two poles of the earth of described permanent magnet contact with one end of first, second magnetic conductor respectively, and described permanent magnet and first, second magnetic conductor form L-shaped;
The other end of the first or second magnetic conductor is disposed adjacent with described magnetic perception component, and described permanent magnet, first, second magnetic conductor, magnetic perception component forms a concave shape;
Wherein, described bias magnetic field is suitable for sending from the end of described first magnetic conductor, and passes described magnetic perception component along the length direction of the second magnetic conductor, namely forms the bypass loop of the described magnetic line of force;
The air magnetic gap being suitable for regulating magnetic field intensity is left between described magnetic perception component and the second magnetic conductor.
Further, in order to state the magnetic field that magnetic bias generating means produces described in receiving, described magnetic perception component comprises: three converge body in the trumpet-shaped magnetic being suitable for converging magnetic signal, the hydraucone that these three pairs of magnetic converge body arranges all outwardly and is on six end faces of a square respectively, form a cavity between the medial extremity of these three pairs of magnetic convergence bodies, in this cavity, be provided with the three-D magnetic field sensor be connected with described processor module; The X-axis of setting three-D magnetic field sensor, Y-axis, Z axis are consistent with the central axis that first, second, third pair of magnetic converges body respectively;
Described vehicle detection apparatus is suitable for being arranged on the center line in a track, when target vehicle enters described bias magnetic field in this lanes process, then the X-axis of described three-D magnetic field sensor is suitable for detecting the described target vehicle magnetic disturbance signal that direction produces before or after described magnetic perception component; The Y-axis of described three-D magnetic field sensor is suitable for detecting the magnetic disturbance signal that described target vehicle produces in the left or right direction of described magnetic perception component; The Z axis of described three-D magnetic field sensor is suitable for detecting the magnetic disturbance signal that described target vehicle produces above described magnetic perception component;
Described storage unit also stores vehicle shift database;
The method obtaining described vehicle shift database is: after determining type of vehicle, the magnetic disturbance signal described Y-axis detected converts the pulse waveform corresponding with offset distance to, wherein, offset distance is the distance of the center line in track described in the center axis deviation of target vehicle; And the amplitude average value of magnetic disturbance signal that the amplitude of this pulse waveform is detected by Y-axis is determined; Obtain each pulse waveform that described offset distance is corresponding thus, namely form described vehicle shift database;
The magnetic disturbance signal that described processor module is also suitable for described Y-axis to detect is converted to second pulse signal corresponding with this target vehicle, and its pulse height is the amplitude average value of this magnetic disturbance signal; Pulse height in second pulse signal and vehicle shift database contrasts by described processor module, can obtain the described offset distance of this target vehicle;
Also comprise the corresponding relation of type of vehicle and overall width in described type of vehicle feature database, that is, know target overall width by target vehicle type;
Described processor module presets described lane width, by detecting described offset distance and target overall width sum is greater than described lane width, to judge the pressure wheel lane line of described target vehicle.Can accurately judge whether vehicle delays unloading diatom by detecting the magnetic disturbance signal of Y direction.
The technical matters that the present invention also will solve in addition is to provide a kind of vehicle checking method being suitable for accurately judging type of vehicle based on bias magnetic field, then solves the technical matters for vehicle speed measuring.
In order to solve the problems of the technologies described above, the invention provides a kind of method of work of vehicle detection apparatus, comprising:
1., by a magnetic bias generating means for generation of the stable bias magnetic field of a space distribution, and the loop direction of circling that the magnetic line of force of this bias magnetic field is formed is consistent with direction, track, and covers the upper space in this track;
2. the magnetic perception component receiving target vehicle, be positioned in described bias magnetic field by enters the magnetic disturbance signal that described bias magnetic place produces;
3., the storage unit of type of vehicle feature database is stored, wherein,
The method obtaining described type of vehicle feature database is: when all types of vehicle respectively from described bias magnetic field through out-of-date, described magnetic perception component receive described vehicle produce magnetic disturbance signal; Convert each magnetic disturbance signal to the pulse waveform corresponding with the type of described vehicle, the amplitude of this pulse waveform is determined by the amplitude average value of described magnetic disturbance signal; Each pulse waveform that the type of thus obtained and described vehicle is corresponding, namely forms described type of vehicle feature database, and type of vehicle feature database described in this also comprises the corresponding relation of type of vehicle and vehicle commander, overall width;
4., by magnetic disturbance signal that magnetic perception component described in a processor module process be connected with this storage unit receives;
That is, described processor module is converted to first pulse signal corresponding with described target vehicle this magnetic disturbance signal, and its pulse height is the amplitude average value of this magnetic disturbance signal;
Pulse height in described first pulse signal and described type of vehicle feature database contrasts by described processor module, can obtain the type of this target vehicle, know target vehicle commander by target vehicle type;
5., described processor module is suitable for determining pulse width according to the duration of described magnetic disturbance signal, by calculating the ratio of this target vehicle commander and pulse width, obtains target vehicle speed.
Further, in order to produce the stable non-uniform stable magnetic field of a distribution along road direction, described magnetic bias generating means comprises: permanent magnet, first, second magnetic conductor, the two poles of the earth of described permanent magnet contact with one end of first, second magnetic conductor respectively, and described permanent magnet and first, second magnetic conductor form L-shaped;
The other end of the first or second magnetic conductor is disposed adjacent with described magnetic perception component, and described permanent magnet, first, second magnetic conductor, magnetic perception component forms a concave shape;
Wherein, described bias magnetic field is suitable for sending from the end of described first magnetic conductor, and passes described magnetic perception component along the length direction of the second magnetic conductor, namely forms the bypass loop of the described magnetic line of force;
The air magnetic gap being suitable for regulating magnetic field intensity is left between described magnetic perception component and the second magnetic conductor;
Described magnetic perception component comprises: three converge body in the trumpet-shaped magnetic being suitable for converging magnetic signal, the hydraucone that these three pairs of magnetic converge body arranges all outwardly and is on six end faces of a square respectively, form a cavity between the medial extremity of these three pairs of magnetic convergence bodies, in this cavity, be provided with the three-D magnetic field sensor be connected with described processor module; The X-axis of setting three-D magnetic field sensor, Y-axis, Z axis are consistent with the central axis that first, second, third pair of magnetic converges body corresponding respectively;
Described vehicle detection apparatus is suitable for being arranged on the center line in a track, when target vehicle enters described bias magnetic field in this lanes process, then the X-axis of described three-D magnetic field sensor is suitable for detecting the described target vehicle magnetic disturbance signal that direction produces before or after described magnetic perception component; The Y-axis of described three-D magnetic field sensor is suitable for detecting the magnetic disturbance signal that described target vehicle produces in the left or right direction of described magnetic perception component; The Z axis of described three-D magnetic field sensor is suitable for detecting the magnetic disturbance signal that described target vehicle produces above described magnetic perception component;
Described storage unit also stores vehicle shift database;
The method obtaining described vehicle shift database is: after determining type of vehicle, the magnetic disturbance signal described Y-axis detected converts the pulse waveform corresponding with offset distance to, wherein, offset distance is the distance of the center line in track described in the center axis deviation of target vehicle; And the amplitude average value of magnetic disturbance signal that the amplitude of this pulse waveform is detected by Y-axis is determined; Obtain each pulse waveform that described offset distance is corresponding thus, namely form described vehicle shift database;
The method of work of vehicle detection apparatus also comprises: judge whether the vehicle body of described target vehicle delays unloading the method for diatom, and the method comprises:
The magnetic disturbance signal that A, described processor module are also suitable for described Y-axis to detect is converted to second pulse signal corresponding with this target vehicle, and its pulse height is the amplitude average value of this magnetic disturbance signal; Pulse height in second pulse signal and vehicle shift database contrasts by described processor module, can obtain the described offset distance of this target vehicle;
B, know target overall width by target vehicle type;
C, described processor module preset described lane width, by detecting described offset distance and target overall width sum is greater than described lane width, to judge the pressure wheel lane line of described target vehicle.
Compared with prior art, tool of the present invention has the following advantages: (1) vehicle detection apparatus of the present invention by a space distribution stable and the bias magnetic field consistent with road track direction, the magnetic disturbance signal that various vehicle is produced through this magnetic field becomes each relatively-stationary signal, is convenient to the detection to type of vehicle, length, speed; (2) described vehicle detection apparatus overcomes the defect of traditional ground induction coil, geomagnetic sensor, namely, the bias magnetic field that magnetic bias generating means produces avoids the interference of terrestrial magnetic field, ferromagnetic material, and relative to detection method traditional detection such as infrared rays, this vehicle detection apparatus is without the need to paired appearance, only need a detection that can complete type of vehicle, length, speed, this is that traditional means cannot realize; (3) described vehicle detection apparatus adopts bias magnetic field, vehicle detection is carried out under being highly suitable for road environment complicated situation, traditional infrared ray, geomagnetic sensor, ground induction coil, when vehicle 1/2 or 1/3 is pressed on infrared ray sensor, geomagnetic sensor or ground induction coil, they often produce erroneous judgement, but because bias magnetic field is covered in track, as long as so vehicle travels in this track, described vehicle detection apparatus just can accurately draw the information such as type, length, the speed of a motor vehicle of vehicle; (4) distance between center line in vehicle shift track can be judged by the magnetic disturbance signal of Y direction accurately, judge this vehicle whether line ball further, the foundation whether can broken rules and regulations as vehicle.
Another technical matters that the present invention also will solve is to provide a kind of vehicle and delays unloading solid line grasp shoot device, and this vehicle solid line grasp shoot device of delaying unloading solves the technical matters cannot taking the lane change of vehicle solid line.
In order to solve the problems of the technologies described above, the invention provides a kind of vehicle solid line grasp shoot device of delaying unloading to comprise, adopt vehicle detection apparatus of the present invention, described vehicle detection apparatus is located on the center line in solid line track, and the control module that this vehicle detection apparatus and is suitable for controlling to capture camera head is connected;
Wherein, described processor module presets solid line lane width, after obtaining target overall width corresponding to type of vehicle, obtain described offset distance, to judge whether this offset distance and target overall width sum are greater than described solid line lane width, if be greater than, then judge that the vehicle body of described target vehicle is delayed unloading solid line, that is, described control module controls described candid photograph camera head and captures.
Another technical matters that the present invention also will solve is to provide a kind of vehicle and delays unloading the method for work of solid line grasp shoot device, which solves the technical matters cannot taking the lane change of vehicle solid line.
In order to solve the problems of the technologies described above, the invention provides a kind of vehicle and to delay unloading the method for work of solid line grasp shoot device, comprising:
The center line in solid line track is provided with vehicle detection apparatus of the present invention, and the control module that this vehicle detection apparatus and is suitable for controlling to capture camera head is connected;
Wherein, described processor module presets solid line lane width, after obtaining target overall width corresponding to type of vehicle, obtain described offset distance, to judge whether this offset distance and target overall width sum are greater than described solid line lane width, if be greater than, then judge that the vehicle body of described target vehicle is delayed unloading solid line, that is, described control module controls described candid photograph camera head and captures.
Compared with prior art, tool of the present invention has the following advantages: the delay unloading technical scheme of solid line grasp shoot device and method of work thereof of described vehicle not only has the advantage of the first two invention technical scheme, can also effectively capture vehicle line ball, device is simple, without the need to other wiring, vehicle detection apparatus is combined with a camera head and just can realizes capturing operating, and cost is low; And solve the technical matters cannot taking the lane change of vehicle solid line at present, be also convenient to carry out evidence obtaining work after vehicle lane change generation traffic hazard occurs.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
The circuit structure block diagram of a kind of embodiment of Fig. 1 vehicle detection apparatus of the present invention;
The circuit structure block diagram of the another kind of embodiment of Fig. 2 vehicle detection apparatus of the present invention;
The structural representation of Fig. 3 magnetic bias generating means of the present invention and magnetic perception component;
Fig. 4 magnetic of the present invention converges the perspective view of body;
The structural representation of Fig. 5 magnetic perception component of the present invention;
Fig. 6 vehicle detection apparatus of the present invention is located at the schematic diagram of the center line in track;
Fig. 7 a kind of vehicle of the present invention is delayed unloading the circuit module block diagram of solid line grasp shoot device.
Wherein, permanent magnet 1, first magnetic conductor 2, second magnetic conductor 3, magnetic perception component 4, bias magnetic field 5, air magnetic gap 6, magnetic converge body 7, cavity 8, lane line 9.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail:
Embodiment 1
See Fig. 1, Fig. 3, a kind of vehicle detection apparatus, comprising:
Magnetic bias generating means, for generation of the bias magnetic field 5 that a space distribution is stable, and the loop direction of circling that the magnetic line of force of this bias magnetic field 5 is formed is consistent with direction, track, and covers this track;
Magnetic perception component 4, is positioned in described bias magnetic field 5, and receiving target vehicle enters the magnetic disturbance signal that described bias magnetic field 5 produces;
Storage unit, stores type of vehicle feature database, can also store the type of vehicle that described track allows to sail into simultaneously;
Described type of vehicle feature database is priori, needs to obtain before this device of use; Wherein, the method obtaining described type of vehicle feature database is: when all types of vehicle respectively from described bias magnetic field 5 through out-of-date, described magnetic perception component 4 receive described vehicle produce magnetic disturbance signal; Convert each magnetic disturbance signal to the pulse waveform corresponding with the type of described vehicle, the amplitude of this pulse waveform is determined by the amplitude average value of described magnetic disturbance signal; Each pulse waveform that the type of thus obtained and described vehicle is corresponding, namely forms described type of vehicle feature database.
Processor module, is connected with this storage unit, is suitable for the magnetic disturbance signal processing the reception of described magnetic perception component 4; That is, described processor module is converted to first pulse signal corresponding with described target vehicle this magnetic disturbance signal, and its pulse height is the amplitude average value of this magnetic disturbance signal; Pulse height in described first pulse signal and described type of vehicle feature database contrasts by described processor module, can obtain the type of this target vehicle.
The type of vehicle comprises, the information such as length, width, car weight of vehicle.
Described vehicle detection apparatus can also be connected with camera head, after processor module judges target vehicle type, if find, the target vehicle type through described vehicle detection apparatus is the vehicle that No entry, then start described camera head and capture target vehicle.
This technical scheme mainly solves the entry region vehicle peccancy shooting in current city, namely in present city, a lot of road forbids that the vehicle of some types sails into, such as, truck can not sail urban district into, but this situation can not occur daytime, but to evening, time traffic police supervises weakness, a lot of truck stealthily can enter urban district, and the road load-carrying design in urban district cannot bear the weight of these trucies, have a strong impact on the life-span of road, so in this case, be sought after a kind of grasp shoot device, can capture this kind of vehicle entering forbidden zone, stop to break rules and regulations.
Further, this magnetic bias generating means is also suitable for the speed of a motor vehicle detecting target vehicle, also comprises the corresponding relation of type of vehicle and vehicle commander, that is, know target vehicle commander by target vehicle type in described type of vehicle feature database; Described processor module is suitable for determining pulse width according to the duration of described magnetic disturbance signal, by calculating the ratio of this target vehicle commander and pulse width, obtains target vehicle speed.
Described vehicle detection apparatus, while shooting rule-breaking vehicle enters forbidden zone, can also being captured target vehicle hypervelocity, namely by detecting the speed of a motor vehicle of target vehicle, taking over-speed vehicles.
Wherein, described magnetic bias generating means can use the permanent magnet of difformity, different materials, different qualities to form, but its essence is on track, produces the stable bias magnetic field of a space distribution 5 along direction, track; Magnetic perception component 4, can receive the magnetic field of coming from all directions radiation, obtains a convergence magnetic field; Magnetic disturbance signal, it is that a ferromagnetic material enters in magnetic field, is magnetized rear produced complementary field; The magnetic induction intensity of this complementary field is according to the quality of this ferromagnetic material, the difference of structure and different, that is, when automobile is through this bias magnetic field 5, the main material due to vehicle is iron and steel, and vehicle will produce magnetic disturbance in this bias magnetic field; The difference of the structure and layout of the length of vehicle, width, the number of axle, the parts such as engine and gearbox-type, the wide high signal characteristic of the magnetic disturbance signal amplitude that different vehicle is formed, length, Wave crest and wave trough is different.The bias magnetic field determined 5 times, the magnetic signal feature of identical type of vehicle is basically identical, and this is the physical basis that this vehicle detection apparatus carries out detecting.
In described vehicle detection apparatus, set up type of vehicle feature database particularly crucial.So the following two kinds method can also be adopted to set up type of vehicle feature database, and the detection carrying out type of vehicle and the work of testing the speed.
The method of method one, the described type of vehicle feature database of described acquisition can also receive by magnetic perception component 4 the magnetic disturbance signal that target vehicle produces when the bias magnetic field 5, and after purpose processor resume module, extract the feature at time domain, frequency domain corresponding to magnetic disturbance signal to determine respective type vehicle.
When carrying out vehicle detection, also can extract target vehicle above magnetic bias generating means time produce the time domain of signal, the feature of frequency domain, and obtain the time domain of signal in described type of vehicle feature database with the method, frequency domain character compares, to obtain the type of target vehicle, and Vehicle length judgement is carried out on the basis of type detection, finally carry out the calculating of speed.
Method two, in order to improve the accuracy of type of vehicle feature database further, the method setting up type of vehicle feature database comprises:
When all types of vehicle respectively from described bias magnetic field through out-of-date, described magnetic perception component receive described vehicle produce magnetic disturbance signal; After each magnetic disturbance signal digital, therefrom extract the characteristic relevant to these vehicles, comprise the pulse height average characteristics of magnetic disturbance signal, extremal features and spatial-temporal distribution characteristic, be stored in storage unit with the form of fisrt feature matrix after classification is summed up, the type of vehicle feature database described in composition, namely, the type of vehicle feature database that the fisrt feature matrix obtaining described magnetic disturbance sample is formed, this type of vehicle feature database also comprises the corresponding relation of type of vehicle and vehicle commander, overall width;
If preserve with the form of fisrt feature matrix in described type of vehicle feature database, then the eigenmatrix in the fisrt feature matrix of described magnetic disturbance sample and described type of vehicle feature database contrasts by described processor module, the type of this target vehicle can be obtained, and obtain the length data of this vehicle further, and the time-parameters representated by disturbing signal width obtains vehicle speed data, namely, described processor module determines disturbing signal width according to the duration of described magnetic disturbance signal, by calculating the ratio of this target vehicle commander and the deration of signal, obtain target vehicle speed.
See Fig. 3, in order to improve directivity, stability, the intensity of bias magnetic field 5, described magnetic bias generating means comprises: permanent magnet 1, first, second magnetic conductor, the two poles of the earth of described permanent magnet 1 contact with one end of first, second magnetic conductor respectively, and described permanent magnet 1 and first, second magnetic conductor form L-shaped; The other end of the first or second magnetic conductor is disposed adjacent with described magnetic perception component 4, and described permanent magnet 1, first, second magnetic conductor, magnetic perception component 4 forms a concave shape; Wherein, described bias magnetic field 5 is suitable for sending from the end of described first magnetic conductor 2, and passes described magnetic perception component 4 along the length direction of the second magnetic conductor 3, namely forms the bypass loop of the described magnetic line of force; The air magnetic gap 6 being suitable for regulating magnetic field intensity is left between described magnetic perception component 4 and the second magnetic conductor 3.
Wherein, magnetic bias magnetic field 5 is made up of Nd-Fe-B permanent magnet 1 and magnetic flux guide body (magnetic conductor), and magnetic flux guide body makes with high permeability materials, has higher saturation flux B
sand lower magnetic resistance σ, the non-uniform stable magnetic field that a distribution is stable can be produced around sensing point.Because the magnetic induction of this magnetic field in effective search coverage is far above terrestrial magnetic field, this magnetic signature has nothing to do with sensing point latitude and direction of traffic, thus broken away from earth magnetism detection method is difficult to obtain unified detecting parameter shortcoming by latitude and azimuthal influence, and provide pacing items for the detection based on signal structure characteristic and frequency characteristic.This Distribution of Magnetic Field and field intensity can need to determine according to detection, to obtain optimal detection effect.Namely regulate the size of described air magnetic gap 6 to adjust magnetic field intensity.
See Fig. 4, Fig. 5, Fig. 6, described magnetic perception component 4 comprises: three converge body 7 in the trumpet-shaped magnetic being suitable for converging magnetic signal, the hydraucone that these three pairs of magnetic converge body 7 arranges all outwardly and is on six end faces of a square respectively, form a cavity 8 between the medial extremity of these three pairs of magnetic convergence bodies 7, in this cavity 8, be provided with the three-D magnetic field sensor be connected with described processor module; The X-axis of setting three-D magnetic field sensor, Y-axis, Z axis are consistent with the central axis that first, second, third pair of magnetic converges body 7 respectively; Wherein, magnetic converges body 7 also can be bucking ladder column.
Described vehicle detection apparatus is suitable for being arranged on the center line in a track, when target vehicle enters described bias magnetic field 5 in this lanes process, then the X-axis of described three-D magnetic field sensor is suitable for detecting the described target vehicle magnetic disturbance signal that direction produces before or after described magnetic perception component 4; The Y-axis of described three-D magnetic field sensor is suitable for detecting the magnetic disturbance signal that described target vehicle produces in the left or right direction of described magnetic perception component 4; The Z axis of described three-D magnetic field sensor is suitable for detecting the magnetic disturbance signal that described target vehicle produces above described magnetic perception component 4; Namely, described magnetic perception component 4 fore-and-aft direction is that first pair of magnetic converges body, left and right directions is that second pair of magnetic converges body, above-below direction is that the 3rd pair of magnetic converges body, simultaneously also can be as required, adjust the corresponding relation that the X, Y, Z axis of described three-D magnetic field sensor and the first, second, third pair of magnetic converge body, detection method is the same.
Realize above-mentioned type of vehicle when detecting, described magnetic disturbance signal is the summation (gathering) of magnetic disturbance signal in X-axis, Y-axis, Z axis three directions.
Described storage unit also stores vehicle shift database; The method obtaining described vehicle shift database is: under the vehicle condition determined, the magnetic disturbance signal described Y-axis detected converts the pulse waveform corresponding with offset distance to, wherein, offset distance is the distance of the center line in track described in the center axis deviation of target vehicle; And the amplitude average value of magnetic disturbance signal that the amplitude of this pulse waveform is detected by Y-axis is determined; Obtain each pulse waveform that described offset distance is corresponding thus, namely form described vehicle shift database.
The magnetic disturbance signal that described processor module is also suitable for described Y-axis to detect is converted to second pulse signal corresponding with this target vehicle, and its pulse height is the amplitude average value of this magnetic disturbance signal; Pulse height in second pulse signal and vehicle shift database contrasts by described processor module, can obtain the described offset distance of this target vehicle.
In order to improve the accuracy detecting magnetic disturbance signal in Y-axis further, the method obtaining described vehicle shift database also comprises: according to the distance of different vehicle center axis deviation track center line entering bias magnetic field, the magnetic disturbance signal described Y-axis detected converts the offsets data corresponding with this offset distance to, also offsets matrix or second feature signal matrix can be called, this characteristic comprises the average characteristics of shifted signal, namely this average characteristics comprises: the pulse height average characteristics of the magnetic disturbance signal received by Y direction, extremal features and spatial-temporal distribution characteristic, obtain the various offsets data that described offset distance is corresponding thus, namely form described vehicle shift database, described in this, vehicle shift database is made up of second feature signal matrix.
According to the described offset distance being determined target vehicle by described second feature signal matrix, the magnetic disturbance signal that then described processor module is also suitable for described Y-axis to detect is converted to the second feature signal matrix corresponding with this target vehicle, and its characteristic parameter is mean value feature and the extremal features of this magnetic disturbance signal.Characteristic in second characteristic matrix and vehicle shift database contrasts by described processor module, can obtain the described offset distance of this target vehicle.
Also comprise the corresponding relation of type of vehicle and overall width in described type of vehicle feature database, that is, know target overall width by target vehicle type; Described processor module presets described lane width, by detecting described offset distance and target overall width sum is greater than described lane width, to judge the pressure wheel lane line 9 of described target vehicle.
See Fig. 2, for the stringent environmental requirements of road field monitoring, signal condition part adopts the design of low drifting low noise amplifier, realizes temperature compensation in conjunction with field temperature sensor; Described vehicle detection apparatus also comprises: be connected with described processor module one is suitable for the temperature sensor gathering environment temperature, and described processor module is also suitable for carrying out temperature compensation to magnetic disturbance signal; Described magnetic perception component 4 and one is suitable for regulating the modulate circuit of the signal amplitude of magnetic disturbance signal to be connected, and this modulate circuit is connected with described processor module.
Processor module in this embodiment for establishing the processor module of AD conversion in single-chip microcomputer, embedded, DSP etc., also can adopt the technical scheme of external AD conversion module to realize.
Embodiment 2
See Fig. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, the method for work of a kind of vehicle detection apparatus on embodiment 1 basis, comprising:
1., by a magnetic bias generating means for generation of the stable bias magnetic field 5 of a space distribution, and the loop direction of circling that the magnetic line of force of this bias magnetic field 5 is formed is consistent with direction, track, and covers the superjacent air space in this track;
2. the magnetic perception component 4 receiving target vehicle, be positioned in described bias magnetic field 5 by enters the magnetic disturbance signal that described bias magnetic field 5 produces;
3., the storage unit that type of vehicle feature database and described track allow the type of vehicle sailed into is stored,
Type of vehicle feature database is pre-stored in storer, is priori data, is obtained by abundant experimental results after statistical treatment; Wherein, the method obtaining described type of vehicle feature database is: when all types of vehicle respectively from described bias magnetic field 5 through out-of-date, described magnetic perception component 4 receive described vehicle produce magnetic disturbance signal; Convert each magnetic disturbance signal to the pulse waveform corresponding with the type of described vehicle, the amplitude of this pulse waveform is determined by the amplitude average value of described magnetic disturbance signal; Each pulse waveform that the type of thus obtained and described vehicle is corresponding, namely forms described type of vehicle feature database, and type of vehicle feature database described in this also comprises the corresponding relation of type of vehicle and vehicle commander, overall width.
The another kind method of setting up type of vehicle feature database is with to improve the method setting up type of vehicle feature database in embodiment 1 identical.
That is, the described method setting up type of vehicle feature database comprises: when all types of vehicle respectively from described bias magnetic field through out-of-date, described magnetic perception component receive described vehicle produce magnetic disturbance signal; After each magnetic disturbance signal digital, therefrom extract the characteristic relevant to these vehicles, comprise the pulse height average characteristics of magnetic disturbance signal, extremal features and spatial-temporal distribution characteristic, be stored in storage unit with the form of fisrt feature matrix after classification is summed up, type of vehicle feature database described in composition, that is, the type of vehicle feature database that the fisrt feature matrix obtaining described magnetic disturbance sample is formed.
If 4. described type of vehicle feature database adopts the form of pulse waveform, then by magnetic disturbance signal that magnetic perception component 4 described in a processor module process be connected with this storage unit receives; That is, described processor module is converted to first pulse signal corresponding with described target vehicle this magnetic disturbance signal, and its pulse height is the amplitude average value of this magnetic disturbance signal.
Pulse height in described first pulse signal and described type of vehicle feature database contrasts by described processor module, the type of this target vehicle can be obtained, if when judging that the target vehicle of the type should not sail track into, then start described camera head and capture target vehicle.
Target vehicle commander, overall width is known by target vehicle type.
Described processor module is suitable for determining pulse width according to the duration of described magnetic disturbance signal, by calculating the ratio of this target vehicle commander and pulse width, obtains target vehicle speed.If during this target vehicle speed hypervelocity, then export corresponding candid photograph control signal, start described camera head and capture target vehicle.
If 5. described type of vehicle feature database adopts the form of fisrt feature matrix, then the eigenmatrix in the fisrt feature matrix of described magnetic disturbance sample and described type of vehicle feature database contrasts by described processor module, the type of this target vehicle can be obtained, if when judging that the target vehicle of the type should not sail track into, then start described camera head and capture target vehicle.
The length data of further this vehicle of acquisition, and the time-parameters representated by disturbing signal width obtains vehicle speed data, namely, described processor module determines disturbing signal width according to the duration of described magnetic disturbance signal, by calculating the ratio of this target vehicle commander and the deration of signal, obtain target vehicle speed.If during this target vehicle speed hypervelocity, then export corresponding candid photograph control signal, start described candid photograph camera head and capture target vehicle.
Wherein, also comprise in the method for work of described vehicle detection apparatus:
Described magnetic bias generating means comprises: permanent magnet 1, first, second magnetic conductor, and the two poles of the earth of described permanent magnet 1 contact with one end of first and second magnetic conductor respectively, and described permanent magnet 1 and first, second magnetic conductor form L-shaped; The other end of the first or second magnetic conductor is disposed adjacent with described magnetic perception component 4, and described permanent magnet 1, first, second magnetic conductor, magnetic perception component 4 forms a concave shape; Wherein, described bias magnetic field 5 is suitable for sending from the end of described first magnetic conductor 2, and passes described magnetic perception component 4 along the length direction of the second magnetic conductor 3, namely forms the bypass loop of the described magnetic line of force; The air magnetic gap 6 being suitable for regulating magnetic field intensity is left between described magnetic perception component 4 and the second magnetic conductor 3; Described magnetic perception component 4 comprises: three converge body 7 in the trumpet-shaped magnetic being suitable for converging magnetic signal, the hydraucone that these three pairs of magnetic converge body 7 arranges all outwardly and is on six end faces of a square respectively, form a cavity 8 between the medial extremity of these three pairs of magnetic convergence bodies 7, in this cavity 8, be provided with the three-D magnetic field sensor be connected with described processor module; The X-axis of setting three-D magnetic field sensor, Y-axis, Z axis are consistent with the central axis that first, second, third pair of magnetic converges body 7 corresponding respectively.
Described vehicle detection apparatus is suitable for being arranged on the center line in a track, when target vehicle enters described bias magnetic field 5 in this lanes process, then the X-axis of described three-D magnetic field sensor is suitable for detecting the described target vehicle magnetic disturbance signal that direction produces before or after described magnetic perception component 4; The Y-axis of described three-D magnetic field sensor is suitable for detecting the magnetic disturbance signal that described target vehicle produces in the left or right direction of described magnetic perception component 4; The Z axis of described three-D magnetic field sensor is suitable for detecting the magnetic disturbance signal that described target vehicle produces above described magnetic perception component 4.
Described storage unit also stores vehicle shift database;
The method obtaining described vehicle shift database is: after determining type of vehicle, the magnetic disturbance signal described Y-axis detected converts the pulse waveform corresponding with offset distance to, wherein, offset distance is the distance of the center line in track described in the center axis deviation of target vehicle; And the amplitude average value of magnetic disturbance signal that the amplitude of this pulse waveform is detected by Y-axis is determined; Obtain each pulse waveform that described offset distance is corresponding thus, namely form described vehicle shift database.
In order to improve the accuracy detecting magnetic disturbance signal in Y-axis further, the method obtaining described vehicle shift database also comprises: according to the distance of different vehicle center axis deviation track center line entering bias magnetic field, the magnetic disturbance signal described Y-axis detected converts the offsets data corresponding with this offset distance to, also offsets matrix or second feature signal matrix can be called, this characteristic comprises the average characteristics of shifted signal, namely this average characteristics comprises: the pulse height average characteristics of the magnetic disturbance signal received by Y direction, extremal features and spatial-temporal distribution characteristic, obtain the various offsets data that described offset distance is corresponding thus, namely form described vehicle shift database, described in this, vehicle shift database is made up of second feature signal matrix.
On the basis that two kinds are set up vehicle shift database, carry out judging whether the vehicle body of described target vehicle delays unloading the method for diatom 9, comprising:
Method one,
The magnetic disturbance signal that A, described processor module are also suitable for described Y-axis to detect is converted to second pulse signal corresponding with this target vehicle, and its pulse height is the amplitude average value of this magnetic disturbance signal; Pulse height in second pulse signal and vehicle shift database contrasts by described processor module, can obtain the described offset distance of this target vehicle.
B, know target overall width by target vehicle type.
C, described processor module preset described lane width, by detecting described offset distance and target overall width sum is greater than described lane width, to judge the pressure wheel lane line 9 of described target vehicle, starting described camera head immediately and capturing target vehicle.
Method two,
The magnetic disturbance signal that a, described processor module are also suitable for described Y-axis to detect is converted to the second characteristic matrix corresponding with this target vehicle; Offsets matrix in second characteristic matrix and vehicle shift database contrasts by described digital signal processor module, can obtain the described offset distance of this target vehicle.
B, know target overall width by target vehicle type.
C, described processor module preset described lane width, by detecting described offset distance and target overall width sum is greater than described lane width, to judge the pressure wheel lane line 9 of described target vehicle, starting described camera head immediately and capturing target vehicle.
Embodiment 3
See Fig. 6, Fig. 7, solid line grasp shoot device delayed unloading by a kind of vehicle on the basis of embodiment 1,2, comprise, vehicle detection apparatus, described vehicle detection apparatus is located on the center line in solid line track, and is connected with a control module being suitable for controlling to capture camera head.
Wherein, described processor module presets solid line lane width, after obtaining target overall width corresponding to type of vehicle, obtain described offset distance, to judge whether this offset distance and target overall width sum are greater than described solid line lane width, if be greater than, then judge that the vehicle body of described target vehicle is delayed unloading solid line, that is, described control module controls described candid photograph camera head and captures.
Can be connected with described control module by described processor module, capture to control capturing camera head.
After described processor module judges that this type of vehicle should not sail described track, overspeed of vehicle, compacting line into, be all suitable for controlling described control module and start described candid photograph camera head and capture.
While inspection vehicle wheel line ball, vehicle and the over-speed vehicles that can also enter entry region to breaking rules and regulations are captured.
Embodiment 4
See Fig. 6, Fig. 7, the method for work that solid line grasp shoot device delayed unloading by a kind of vehicle on the basis of embodiment 1,2,3, comprising:
The center line in solid line track is provided with vehicle detection apparatus, and the control module that this vehicle detection apparatus and is suitable for controlling to capture camera head is connected.
Wherein, described processor module presets solid line lane width, after obtaining target overall width corresponding to type of vehicle, obtain described offset distance, to judge whether this offset distance and target overall width sum are greater than described solid line lane width, if be greater than, then judge that the vehicle body of described target vehicle is delayed unloading solid line, that is, described control module controls described candid photograph camera head and captures.
Can be connected with described control module by described processor module, capture to control capturing camera head.
After described processor module judges that this type of vehicle should not sail described track, overspeed of vehicle, compacting line into, be all suitable for controlling described control module and start described candid photograph camera head and capture.
While inspection vehicle wheel line ball, vehicle and the over-speed vehicles that can also enter entry region to breaking rules and regulations are captured.
On the pressure wheel lane line 9 of above-mentioned realize target vehicle and the basis of overspeed snapping, described vehicle detection apparatus can also be located at traffic lights stop line place, by the magnetic disturbance of described Z-direction, judge whether vehicle makes a dash across the red light, and start described camera head target vehicle is captured.
Obviously, above-described embodiment is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And these belong to spirit institute's apparent change of extending out of the present invention or change and are still among protection scope of the present invention.
Claims (1)
1. a vehicle detection apparatus, is characterized in that comprising:
Magnetic bias generating means, for generation of the bias magnetic field that a space distribution is stable, and the loop direction of circling that the magnetic line of force of this bias magnetic field is formed is consistent with direction, track, and covers the upper space in this track;
Magnetic perception component, is positioned in described bias magnetic field, and receiving target vehicle enters the magnetic disturbance signal that described bias magnetic place produces;
Storage unit, stores type of vehicle feature database;
The method obtaining described type of vehicle feature database is: when all types of vehicle respectively from described bias magnetic field through out-of-date, described magnetic perception component receive described vehicle produce magnetic disturbance signal; Convert each magnetic disturbance signal to the pulse waveform corresponding with the type of described vehicle, the amplitude of this pulse waveform is determined by the amplitude average value of described magnetic disturbance signal; Each pulse waveform that the type of thus obtained and described vehicle is corresponding, namely forms described type of vehicle feature database;
Processor module, is connected with this storage unit, is suitable for the magnetic disturbance signal processing the reception of described magnetic perception component; That is, described processor module is converted to first pulse signal corresponding with described target vehicle this magnetic disturbance signal, and its pulse height is the amplitude average value of this magnetic disturbance signal;
Pulse height in described first pulse signal and described type of vehicle feature database contrasts by described processor module, can obtain the type of this target vehicle;
Described magnetic bias generating means comprises: permanent magnet, first, second magnetic conductor, and the two poles of the earth of described permanent magnet contact with one end of first, second magnetic conductor respectively, and described permanent magnet and first, second magnetic conductor form L-shaped;
The other end of the first or second magnetic conductor is disposed adjacent with described magnetic perception component, and described permanent magnet, first and second magnetic conductor, magnetic perception component forms a concave shape;
Wherein, described bias magnetic field is suitable for sending from the end of described first magnetic conductor, and passes described magnetic perception component along the length direction of the second magnetic conductor, namely forms the bypass loop of the described magnetic line of force;
The air magnetic gap being suitable for regulating magnetic field intensity is left between described magnetic perception component and the second magnetic conductor.
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| CN104794902B (en) * | 2015-03-31 | 2017-01-18 | 天津市五维智通科技有限公司 | Intelligent mainframe of wireless geomagnetism vehicle detector |
| CN104835326A (en) * | 2015-04-24 | 2015-08-12 | 周欣 | Vehicle detector based on anisotropy magnetic resistance sensor array |
| CN106128118A (en) * | 2016-06-08 | 2016-11-16 | 青岛交通科技信息有限公司 | A kind of wireless vehicle detecting system |
| CN110741285B (en) * | 2017-06-14 | 2022-05-27 | 爱知制钢株式会社 | Marker detection method and system for vehicle |
| CN107886727B (en) * | 2017-11-13 | 2020-04-14 | 深圳先进技术研究院 | Geomagnetic sensor-based automobile classification method and system and electronic equipment |
| CN109003458B (en) * | 2018-08-09 | 2021-08-10 | 河海大学常州校区 | Intersection vehicle violation monitoring system and method based on triaxial geomagnetic sensor |
| CN112634630A (en) * | 2021-03-10 | 2021-04-09 | 江苏中科院智能科学技术应用研究院 | Vehicle speed measuring method and system under complex environment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5748108A (en) * | 1997-01-10 | 1998-05-05 | Nu-Metrics, Inc. | Method and apparatus for analyzing traffic and a sensor therefor |
| JP2002365009A (en) * | 2001-06-07 | 2002-12-18 | Toyota Motor Corp | Vehicle position detector |
| CN101110161A (en) * | 2007-08-31 | 2008-01-23 | 北京科技大学 | System for automatic cab model recognition and automatic vehicle flowrate detection and method thereof |
| CN102436749A (en) * | 2011-09-28 | 2012-05-02 | 杨多猛 | Wireless vehicle detector and vehicle speed detection method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080117081A1 (en) * | 2006-11-17 | 2008-05-22 | Peter Jerome Radusewicz | Portable traffic analyzer |
-
2013
- 2013-04-22 CN CN201310141580.1A patent/CN104112359B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5748108A (en) * | 1997-01-10 | 1998-05-05 | Nu-Metrics, Inc. | Method and apparatus for analyzing traffic and a sensor therefor |
| JP2002365009A (en) * | 2001-06-07 | 2002-12-18 | Toyota Motor Corp | Vehicle position detector |
| CN101110161A (en) * | 2007-08-31 | 2008-01-23 | 北京科技大学 | System for automatic cab model recognition and automatic vehicle flowrate detection and method thereof |
| CN102436749A (en) * | 2011-09-28 | 2012-05-02 | 杨多猛 | Wireless vehicle detector and vehicle speed detection method thereof |
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