CN106781534A - A kind of berth vehicle checker and detection method - Google Patents
A kind of berth vehicle checker and detection method Download PDFInfo
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- CN106781534A CN106781534A CN201710002706.5A CN201710002706A CN106781534A CN 106781534 A CN106781534 A CN 106781534A CN 201710002706 A CN201710002706 A CN 201710002706A CN 106781534 A CN106781534 A CN 106781534A
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- berth
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- parking stall
- magnetic field
- geomagnetic sensor
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/14—Traffic control systems for road vehicles indicating individual free spaces in parking areas
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- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention proposes a kind of berth vehicle checker, including geomagnetic sensor, for gathering berth periphery magnetic field signal, and transmits to data processing equipment；Data processing equipment, receives the magnetic field signal of the geomagnetic sensors detection, and determine whether that car enters or roll away from berth according to the change of magnetic field signal；Power module, is connected with the geomagnetic sensor and data processing equipment, and the power module includes two or more lithium battery in parallel.The berth vehicle checker cost is relatively low, and goes for motor pool.Present invention also offers a kind of condition detection method of berth vehicle checker.
Description
Technical field
The present invention relates to detection field, more particularly to a kind of berth vehicle checker and detection method.
Background technology
Continuous quickening and the fast development of auto industry, vehicle guaranteeding organic quantity and motor vehicle with process of modernization
The volume of traffic is continuously increased, and driving hardly possible, parking difficulty have become two big persistent ailments of urban transportation.It is solution to greatly develop park construction
A certainly important means of parking difficulty, but because intelligent management level is not high, depend on the traditional mode of labor management to expose
The drawbacks of going out more and more obvious.Therefore, it is possible to facilitate car owner quickly to prepare to find parking stall, information-based parking resource is integrated, improved
Parking lot service efficiency, at the same ensure parking lot industry overall economic benefit intelligent parking management system obtain it is huge
Concern.
The core of intelligent parking system is the accurate detection to parking position state.Therefore, industry has developed some inspections
Survey method is taken solving the problems, such as detection parking position, such as contactless card, ultrasonic wave, video, detection method.But the inspection of the above
There is certain defect in survey method, although for example, contactless card install and it is easy to use, be only used for closed parking lot,
And the total idle berth number in parking lot can only be counted, it is impossible to detect the occupancy situation in specific berth.Ultrasonic detection method
Parking garage is only applicable to, has the disadvantage that power consumption is higher, need to individually powered, and ultrasonic probe short life, need to often change.
Video detecting method needs to arrange a large amount of cameras, so cost is also higher.Therefore it provides a kind of be applied to motor pool,
Lower-cost parking position condition checkout gear is the technical problem of this area urgent need to resolve.
The content of the invention
The technical problem to be solved in the present invention is：A kind of berth vehicle checker and detection method are provided, it can apply to room
Outer parking lot, and cost is relatively low.
What solution of the invention was realized in：A kind of berth vehicle checker, it includes
Geomagnetic sensor, for gathering berth periphery magnetic field signal, and transmits to data processing equipment；
Data processing equipment, receives the magnetic field signal of the geomagnetic sensors detection, and is sentenced according to the change of magnetic field signal
It is disconnected whether to there is car to enter or roll away from berth；
Power module, is connected with the geomagnetic sensor and data processing equipment, and the power module includes two or more
Lithium battery in parallel.
Another technical scheme of the invention is that on above-mentioned basis, the power module includes that two lithiums of parallel connection are sub-
Sulfonyl battery and Li-Ion rechargeable battery.
Another technical scheme of the invention is on above-mentioned basis, also including signal transmitting module, with the data
Processing unit be connected, for by the data is activation of vehicle checker to background server.
Another technical scheme of the invention is that on above-mentioned basis, the signal transmitting module is wireless network signal
Sending module or Bluetooth signal sending module.
Another technical scheme of the invention is that the wireless network signal sending module includes day on above-mentioned basis
Line and wireless serial communication module.
Another technical scheme of the invention is that on above-mentioned basis, the geomagnetic sensor is Freescale
MAG3110 geomagnetic sensors.
Another technical scheme of the invention is that on above-mentioned basis, the data processing equipment is PCL or single-chip microcomputer.
Another technical scheme of the invention is that on above-mentioned basis, also including shell, the power module, earth magnetism are passed
Sensor and data processing equipment are installed in the housing.
Another technical scheme of the invention is on above-mentioned basis, to additionally provide a kind of berth shape of berth vehicle checker
State detection method, comprises the following steps：
S01, parking stall background magnetic field data acquisition carries out berth ground by the geomagnetic sensor with highest refresh rate 80Hz
Magnetic data is gathered, the sample that collection is more than 20, is averaged and is designated as parking stall background magnetic field data value；
S02, vehicle stops judging into the disturbance of parking stall that the geomagnetic sensor catches vehicle and stops into car with the refresh rate of 40Hz
Disturbance during position, records the average value of the data, present single sampled data and preceding 9 unitary sampling data of unitary sampling,
And the average value of preceding 9 unitary sampling data is designated as the sliding average of geomagnetic data, for judging that vehicle stops into parking stall
Dither state；Specifically include,
S021, shake judges, if the difference between single sliding average and moving average sample is Y, setting first is poor
Value threshold value is T1, when difference Y is more than T1, that is, thinks that the earth's magnetic field on berth lock periphery generates disturbance, the geomagnetic sensor
Dynamic refresh rate be set to 40Hz, for catch transient state magnetic field data shake；
S022, significantly shake judges, if difference between single sliding average and moving average sample is Y, setting the
Two difference thresholds are T2, and T2 is more than T1, when difference Y is more than T2, then judge have vehicle to cross just going up for the geomagnetic sensor
The space of side；
S03, vehicle stops the condition adjudgement into parking stall, after vehicle stops parking stall and stops shake completely, the earth magnetism sensing
The data of device collection gradually recover stabilization, if sliding average and the difference of parking stall background magnetic field data value now is X, are on duty
When value is more than the threshold value Valve for setting, judge that vehicle is smoothly parked on berth；
S04, vehicle sail out of parking stall disturbance judge, after judging that vehicle stops into parking stall, the geomagnetic sensor with
The refresh rate of 1.25Hz catches the disturbance that vehicle stops during into parking stall, record the data of unitary sampling, present single sampled data with
And the average value of preceding 9 unitary sampling data, and the slip that the average value of preceding 9 unitary sampling data is designated as geomagnetic data is put down
Average, for judging that vehicle sails out of the shake of parking stall；
S05, vehicle sails out of the condition adjudgement of parking stall completely, when sliding average and the difference of parking stall background magnetic field data value
Less than threshold value Valve, judge that vehicle sails out of parking stall completely.
Berth vehicle checker of the present invention and detection method, when using, can be embedded in suitable position in berth, described
The surface of berth vehicle checker is concordant with ground.Berth periphery magnetic field signal is gathered by the geomagnetic sensor, and is transmitted to number
According to processing unit, data processing equipment determines whether that car enters or roll away from berth according to the change of magnetic field signal, realizes real-time
Detection berth state, and send current berth state in real time to background server, while can send remote by background server
Cheng Zhiling is configured to its parameter, calibration magnetic field etc..The berth vehicle checker cost is relatively low, and goes for outdoor and stop
Parking lot.
Brief description of the drawings
The accompanying drawing for constituting a part of the invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate, for explaining the present invention, not constitute inappropriate limitation of the present invention.
Fig. 1 is the theory diagram of the berth vehicle checker that a kind of embodiment of this programme is related to；
Fig. 2 is the structure chart of the berth vehicle checker that a kind of embodiment of this programme is related to；
Fig. 3 is the flow chart of the berth condition detection method that a kind of embodiment of this programme is related to.
Wherein,
The micro- radar sensor of 1 geomagnetic sensor, 2 data processing equipment 3
The power module of 4 signal transmitting module 5
The closure of 61 embedded body, 62 tank body 63
Specific embodiment
The present invention will be described in detail below in conjunction with the accompanying drawings, and the description of this part is only exemplary and explanatory, should not
There is any restriction effect to protection scope of the present invention.Additionally, description of the those skilled in the art according to presents, can be right
Feature in presents in embodiment and in different embodiments carries out respective combination.
The embodiment of the present invention is as follows, Fig. 1 and Fig. 2, a kind of berth vehicle checker, including geomagnetic sensor 1 is referred to, for adopting
Collection berth periphery magnetic field signal, and transmit to data processing equipment 2；Data processing equipment 2, receives the geomagnetic sensor 1 and examines
The magnetic field signal of survey, and determine whether that car enters or roll away from berth according to the change of magnetic field signal；Power module 5, for giving
Vehicle checker is powered, and the power module 5 is connected with geomagnetic sensor 1 and data processing equipment 2, and the power module 5 includes two
The lithium battery of individual more parallel.Wherein, the geomagnetic sensor 1 can be passed using the earth magnetism based on the design of AMR magnetoresistive transducers
The module of sensor 1, judges whether vehicle stops using the disturbance and change in earth's magnetic field on the Real-time Collection parking stall of three axle geomagnetic sensor 1
On parking stall.Due to there is substantial amounts of ferromagnetic presence in automobile, there is substantial amounts of ferromagnet in engine, chassis so that earth magnetism
There is distortion on car body in field distribution, thus the ferromagnet integrated distribution such as engine, chassis, wheel shaft in vehicle region, car
The Z axis ground magnetic component perpendicular to ground of detection can occur significant change immediately below, and it is that geomagnetic sensor 1 is used for vehicle
The theoretical foundation of detection.In the present embodiment, selection uses the MAG3110 of Freescale as geomagnetic sensor 1, using dynamic
The mode of refresh rate gathers the numerical value of Z axis ground magnetic component directly over parking stall.The algorithm of geomagnetic sensor 1 includes, parking stall background magnetic field
The collection of data, identification vehicle stops the disturbance produced during into parking stall, and detection vehicle stops the plateau behind parking stall, and recognizes car
Sail out of the disturbance produced during parking stall, the plateau that detection vehicle is sailed out of behind parking stall completely.Stop as vehicle is once complete
The record for enter, rolling away from and detection.Data processing equipment 2 can select the processors such as PLC or single-chip microcomputer, and it is according to magnetic field signal
Change determine whether that car enters or rolls berth away from.As shown in figure 1, the data processing equipment 2 can also be deposited including parameter
Storage module, parameter setting module or serial communication protocol processing module, wherein parameter memory module can be stored from FLASH
Device, the serial communication protocol processing module can select existing chip.Furthermore, it is contemplated that stand-by time demand, power supply mould
Block 5 can select energy density high life disposable lithium-battery long, but disposable lithium-battery discharge current is low, therefore in this implementation
In example, from two or more lithium battery in parallel, to improve discharge current.Can specifically select EVE board models ER34615's
The Li-Ion rechargeable battery of lithium thionyl battery (19000 MAH) and EVE board models SPC1520 is used in parallel, Huo Zheyong
Lithium thionyl battery parallel connection storage capacitor is used, the deficiency limited to make up lithium thionyl battery discharge current.Need explanation
It is, the change of the magnetic field signal detected according to geomagnetic sensor 1, then the threshold value of changes of magnetic field is set by experience or experiment, when
When changes of magnetic field exceedes threshold value, then judge there is vehicle entrance/roll away from berth, this determination methods are public in the prior art
Open, it is public in the Chinese patent literature CN102682600A (a kind of transport information detecting system of patent name) disclosed in
Open a kind of change in its disturbance earth's magnetic field when detecting that vehicle passes through using magnetic susceptible material, real-time detection traffic flow (including car
The presence or absence of, the magnitude of traffic flow etc.) problem.Therefore, the innovative point of this patent is not in above-mentioned determination methods.
On the basis of above-described embodiment, in another embodiment of the present invention, also including micro- radar sensor 3, with the number
It is connected according to processing unit 2, is checked for the judged result to geomagnetic sensor 1.It is preferred that micro- radar sensor
3 can use water proof type integrative ultrasonic wave sensor.The operation principle of the ultrasonic sensor is as follows：Single-chip microcomputer I/O pin
The signal of the certain pulsewidth of certain frequency is sent, is passed by receiving and dispatching change-over circuit to ultrasonic wave through power amplification and matching booster circuit
Sensor output ultrasonic wave signal.Ultrasonic sensor receives target echo, and amplification demodulator is relatively exported to monolithic afterwards after filtering
Machine.Single-chip microcomputer calculates target range according to transmitting sound wave to the delay inequality for receiving sound wave.
On the basis of above-described embodiment, in another embodiment of the present invention, also including signal transmitting module 4, with the number
According to processing unit 2 be connected, for by the data is activation of vehicle checker to background server.
On the basis of above-described embodiment, in another embodiment of the present invention, the signal transmitting module 4 is believed for wireless network
Number sending module 4 or Bluetooth signal sending module 4.Wherein described wireless network signal sending module 4 can include antenna and nothing
Line serial communication module, wherein the wireless serial communication module can use LORA spread spectrum technics, the counting has work(
Consumption is low, and power is small, long transmission distance, it is not easy to the characteristics of being disturbed.
On the basis of above-described embodiment, in another embodiment of the present invention, the data at least include vehicle checker ID, letter
Road, magnetic state and ultrasonic status signal.
On the basis of above-described embodiment, in another embodiment of the present invention, also including power module 5, for vehicle checker
Power supply, the power module 5 is connected with geomagnetic sensor 1 and data processing equipment 2.
On the basis of above-described embodiment, in another embodiment of the present invention, the power module 5 includes that two or more is in parallel
Lithium battery.In view of stand-by time demand, power module 5 can select energy density high life disposable lithium-battery long, but
It is that disposable lithium-battery discharge current is low, therefore in the present embodiment, from two or more lithium battery in parallel, to improve electric discharge electricity
Stream.The lithium thionyl battery (19000 MAH) and EVE board models of EVE board models ER34615 can specifically be selected
The Li-Ion rechargeable battery of SPC1520 is used in parallel, or is used with lithium thionyl battery parallel connection storage capacitor, sub- to make up lithium
The limited deficiency of sulfonyl battery discharge current.
On the basis of above-described embodiment, in another embodiment of the present invention, as shown in Fig. 2 the berth vehicle checker is also wrapped
Shell is included, the power module 5, geomagnetic sensor 1 and data processing equipment 2 are installed in the housing.The shell can be with
It is molded using ABS injection moldings.Further, the shell can include embedded body 61, tank body 62 and the part of closure 63 3.
The screw thread for being provided with the inwall of the embedded body 61 and being matched on the outer wall of the closure 63, can so realize rotation peace
Dress, end face seal forms confined space in tank body 62, prevents dust and rainwater from entering in tank body 62, installs very convenient, makes
With lasting a long time.The power module 5, geomagnetic sensor 1 and data processing equipment 2 may be mounted at the tank body 62 of the shell
It is interior.
On the basis of above-described embodiment, in another embodiment of the present invention, as shown in figure 3, a kind of pool of berth vehicle checker
Position condition detection method, comprises the following steps：
S01, parking stall background magnetic field data acquisition carries out berth ground by MAG3110 sensors with highest refresh rate 80Hz
Magnetic data is gathered, it is therefore intended that complete the collection of corresponding magnetic field data sample with the most fast time in drop lock each time.Collection
20 samples are simultaneously averaged and are designated as parking stall background magnetic field data value；
S02, vehicle stop into parking stall disturbance judge, when enter parking stall measure circulation after, the geomagnetic sensor with
The refresh rate of 40Hz catches the disturbance that vehicle stops during into parking stall, record the data of unitary sampling, present single sampled data and
The average value of preceding 9 unitary sampling data, and the average value of preceding 9 unitary sampling data is designated as the moving average of geomagnetic data
Value, for judging that vehicle stops the dither state into parking stall；Vehicle stops the dither state point two parts into parking stall：
S021, shake judges, if the difference between single sliding average and moving average sample is Y, setting first is poor
Value threshold value is T1, when difference Y is more than T1, that is, thinks that the earth's magnetic field on berth lock periphery generates disturbance, and judgement is made by parking
Into shake, return value 1.The dynamic refresh rate of the geomagnetic sensor is set to 40Hz, the magnetic field data for catching transient state
Shake；
S022, significantly shake judges, if difference between single sliding average and moving average sample is Y, setting the
Two difference thresholds are T2, and T2 is more than T1, when difference Y is more than T2, then judge have vehicle to cross just going up for the geomagnetic sensor
The space of side.This is because during vehicle stops and sails out of, because the part of ferromagnet concentration is by directly over sensor
When, the violent magnetic field data more than the second difference threshold T2 can be produced to offset, therefore for judging whether vehicle crosses sensing
Space directly over device, has strengthened the judgement shaken in step S021.
S03, vehicle stops the condition adjudgement into parking stall, after vehicle stops parking stall and stops shake completely, by step S021
Middle shake judgement may determine that parking shake is over, and the data of the geomagnetic sensor collection gradually recover stabilization, if this
When sliding average and parking stall background magnetic field data value difference be X, when difference more than setting threshold value Valve when, judge
Vehicle is smoothly parked on berth, and parking space state is berth to there is car.Now in order to save battery electric quantity, will
The dynamic refresh rate of MAG3110 sensors is adjusted to 1.25Hz.The basis for estimation of parking space state is while judging sensor record
Vehicle stops the plateau behind parking stall disturbance and parking stall Ting Ru parking stalls.
S04, vehicle sail out of parking stall disturbance judge, after judging that vehicle stops into parking stall, the geomagnetic sensor with
The refresh rate of 1.25Hz catches the disturbance that vehicle stops during into parking stall, record the data of unitary sampling, present single sampled data with
And the average value of preceding 9 unitary sampling data, and the slip that the average value of preceding 9 unitary sampling data is designated as geomagnetic data is put down
Average, for judging that vehicle sails out of the shake of parking stall；After the shake during geomagnetic sensor captures step S021 judges, earth magnetism
The dynamic refresh rate lifting of sensor catches shake when vehicle is sailed out of to 40Hz.
S05, vehicle sails out of the condition adjudgement of parking stall completely, and after vehicle sails out of parking stall completely, shake judges to return to 0 i.e. nothing
The difference of shake, sliding average and parking stall background magnetic field data value is less than threshold value Valve, judges that vehicle sails out of parking stall completely
's.It is while judging that sensor record vehicle sails out of parking stall disturbance and vehicle is complete that parking stall set resets and returns the criterion without car
The plateau sailed out of behind parking stall.
In this patent, using the MAG3110 of Freescale as geomagnetic sensor, gathered using the mode of dynamic refresh rate
The numerical value of Z axis ground magnetic component directly over parking stall.Geomagnetic sensor algorithm includes that the collection of parking stall background magnetic field data recognizes car
Stop the disturbance produced during into parking stall, detection vehicle stops the plateau behind parking stall, and is produced when recognizing that vehicle sails out of parking stall
Disturbance, the detection plateau sailed out of completely behind parking stall of vehicle.Stop into, the record that rolls away from and inspection as vehicle is once complete
Survey.
The operation principle of the berth vehicle checker is：During work, geomagnetic sensor 1 is with the cycle of 200mS to periphery magnetic field
Judged, when finding that magnetic field occurs the rate of change more than threshold value, opened 10mS quick samplings until magnetic field is relative again
Stabilization, car entrance/roll berth away from is determined whether by analyzing magnetic field Changing Pattern.Meanwhile, the superthreshold value changes in each magnetic field
Micro- radar sensor 3 will all be triggered to work, to auxiliary judgment.After completing the once operation, berth vehicle checker is to background service
Device sends out data, data include vehicle checker ID, channel, magnetic state, the ultrasound information such as state.Meanwhile, every 5 points of berth vehicle checker
Clockwise background server sends a heartbeat bag data.
Berth vehicle checker of the present invention, when using, can be embedded in suitable position, the berth vehicle checker in berth
Surface it is concordant with ground.Berth periphery magnetic field signal is gathered by the geomagnetic sensor 1, and is transmitted to data processing equipment
2, data processing equipment 2 determines whether car entrance or rolls berth away from according to the change of magnetic field signal, realizes real-time detection berth
State, and send current berth state in real time to background server, while teleinstruction pair can be sent by background server
Its parameter is configured, calibration magnetic field etc..The berth vehicle checker cost is relatively low, and goes for motor pool.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of berth vehicle checker, it is characterised in that：Including
Geomagnetic sensor, for gathering berth periphery magnetic field signal, and transmits to data processing equipment；
Data processing equipment, receives the magnetic field signal of the geomagnetic sensors detection, and be according to the change of magnetic field signal judgement
It is no to there is car to enter or roll away from berth；
Power module, is connected with the geomagnetic sensor and data processing equipment, and the power module includes that two or more is in parallel
Lithium battery.
2. berth vehicle checker according to claim 1, it is characterised in that the power module includes that two lithiums of parallel connection are sub-
Sulfonyl battery and Li-Ion rechargeable battery.
3. berth vehicle checker according to claim 1, it is characterised in that also including signal transmitting module, with the data
Processing unit be connected, for by the data is activation of vehicle checker to background server.
4. berth vehicle checker according to claim 3, it is characterised in that the signal transmitting module is wireless network signal
Sending module or Bluetooth signal sending module.
5. berth vehicle checker according to claim 4, it is characterised in that the wireless network signal sending module includes day
Line and wireless serial communication module.
6. berth vehicle checker according to any one of claim 1 to 5, it is characterised in that the geomagnetic sensor is winged
Think the MAG3110 geomagnetic sensors of karr.
7. berth vehicle checker according to claim 6, it is characterised in that the data processing equipment is PCL or single-chip microcomputer.
8. berth vehicle checker according to claim 6, it is characterised in that also including shell, the power module, earth magnetism are passed
Sensor and data processing equipment are installed in the housing.
9. a kind of berth condition detection method of berth vehicle checker, it is characterised in that comprise the following steps：
S01, parking stall background magnetic field data acquisition carries out berth ground magnetic number by the geomagnetic sensor with highest refresh rate 80Hz
According to collection, the sample that collection is more than 20 is averaged and is designated as parking stall background magnetic field data value；
S02, vehicle stops judging into the disturbance of parking stall, specifically includes
S021, shake judges, if the difference between single sliding average and moving average sample is Y, the first difference threshold of setting
It is T1 to be worth, when difference Y is more than T1, that is, think that the earth's magnetic field on berth lock periphery generates disturbance, and the geomagnetic sensor is moved
State refresh rate is set to 40Hz, and the magnetic field data for catching transient state is shaken；
S022, significantly shake judges, if the difference between single sliding average and moving average sample is Y, setting second is poor
Value threshold value is T2, and T2 is more than T1, when difference Y is more than T2, then judges have vehicle to cross the surface of the geomagnetic sensor
Space；
S03, vehicle stops the condition adjudgement into parking stall, and after vehicle stops parking stall and stops shake completely, the geomagnetic sensor is adopted
The data of collection gradually recover stabilization, if sliding average and the difference of parking stall background magnetic field data value now is X, when difference is big
When the threshold value Valve of setting, judge that vehicle is smoothly parked on berth；
S04, the disturbance that vehicle sails out of parking stall judges that after judging that vehicle stops into parking stall, the geomagnetic sensor is with 1.25Hz's
Refresh rate seizure vehicle stops disturbance during into parking stall, after the shake during geomagnetic sensor captures step S021 judges, earth magnetism
The dynamic refresh rate lifting of sensor catches shake when vehicle is sailed out of to 40Hz；
S05, vehicle sails out of the condition adjudgement of parking stall completely, when the difference of sliding average and parking stall background magnetic field data value is less than
Threshold value Valve, judges that vehicle sails out of parking stall completely.
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| CN201710002706.5A CN106781534A (en) | 2017-01-03 | 2017-01-03 | A kind of berth vehicle checker and detection method |
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| CN201710002706.5A CN106781534A (en) | 2017-01-03 | 2017-01-03 | A kind of berth vehicle checker and detection method |
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| CN103258442A (en) * | 2013-04-18 | 2013-08-21 | 中山市路讯智能交通科技有限公司 | Parking space state sensor and parking space state sensing method |
| CN204129968U (en) * | 2014-10-25 | 2015-01-28 | 哈尔滨优先科技股份有限公司 | Berth, parking lot information acquisition sensor |
| CN104700627A (en) * | 2013-12-06 | 2015-06-10 | 感知技术无锡有限公司 | Parking space detection method, magnetic sensitive detector, server and parking space detection system |
| CN105825708A (en) * | 2016-04-22 | 2016-08-03 | 江苏省交通规划设计院股份有限公司 | Parking space state judgment method of geomagnetic vehicle detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009117755A2 (en) * | 2008-03-26 | 2009-10-01 | Software System Solutions Fc-Llc | Automated parking guidance and management system |
| CN102682600A (en) * | 2011-03-09 | 2012-09-19 | 北京国浩传感器技术研究院(普通合伙) | Traffic information detecting system |
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