Background technology
It is the change by detecting the magnetic field of the earth on parking stall for the vehicle detecting sensor by geomagnetism detecting technologyLaw, to judge whether parking stall is occupied.When vehicle is parked on parking stall, magnetic field of the earth can be interfered, so as to causeThe change that magnetic field of the earth is measured on parking stall；Geomagnetic sensor detects by perceiving and quantifies this change, to judge to have vehicle to account forWith the parking stall；Such sensor there are problems that two using so that in actual use can not accurate judgement parking stall occupancy situation,Influence practical effect.
First, the magnetic interference problem of adjacent parking stall.Because the magnetic properties of vehicle itself are different, thus caused by the earthMagnetic interference amount just varies；Therefore when the sufficiently large vehicle of a magnetic field amount enters parking stall, the adjacent parking stall in left and rightOn can also produce enough magnetic field amounts, geomagnetic sensor has been made car judgement.This just directly affects parking position information of parkAccuracy rate.According to parking bit detector of the case experience based on simple geomagnetism detecting technology, parking position information of park it is accurateRate is 90% or so；This obviously can not meet customer need；
Second, original state can not automatic decision.Magnetic field detector can only be judged by the disturbance rule to vehicle magnetic fieldThe multidate information of vehicle, its initial static magnetic state must be periodically configured by manually, just can guarantee that its normal operation, makeInto very big manual maintenance cost.Once original state mistake, then sensor exports parking stall always car information, or antilogicalInformation, this can also influence the accuracy rate of parking space information.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of higher vehicle detecting sensor of accuracy rate.
In order to solve the above-mentioned technical problem, the technical scheme is that：A kind of vehicle detecting sensor, includes magnetic fieldDetection means, ultrasonic positioner, control of working unit and Doppler radar detection means, the detector for magnetic field is alsoSound and light detecting servicing unit is provided with, the sound and light detecting servicing unit is connected with sound transducer and light intensity sensor；
Detector for magnetic field：Detected with fixed frequency, establish and record the magnetic field value under inactive state, be designated as justBeginning magnetic field value, and the time that magnetic field starts change is caught, it is designated as the initial change time；
Ultrasonic positioner：Location determination is carried out with fixed frequency, judges and provides on current parking stall whether have carInformation, to calibrate parking stall output state information；
Doppler radar detection means：When detecting changes of magnetic field, Doppler radar detection means is activated, is examined by magnetic fieldThe record of device and Doppler radar detection means complete paired data jointly is surveyed, and the positioning for combining ultrasonic positioner is sentencedIt is disconnected, the parking stall occupied information finally provided；
Control of working unit：By the judged result to Doppler radar detection means and ultrasonic positioner, carry outCurrent data analysis and cumulative data analysis, and this two-part hardware check situation is provided, such as faulty automatic upload is reportedAlert information.
Further, the detector for magnetic field is detected with 0.5Hz frequency.
Further, the ultrasonic positioner carries out location determination with 30 seconds/time of frequency.
Further, receiver apparatus, the dormancy of the receiver control vehicle detecting sensor are also included.
Using above-mentioned technical proposal, due to clearly being drawn by Doppler radar detection means, the magnetic field currently changed is believedWhether breath is caused by the vehicle on this parking stall, makes up the deficiency of detector for magnetic field in the detection, accurate by ultrasonic positionerWhether true draws on current parking stall with the presence of vehicle, makes up deficiency of the detector for magnetic field in Static Detection, is carried with reachingRise the purpose of parking space information accuracy rate.Solve the problems, such as that ultrasonic positioner is easily interfered in use simultaneously, lead toThe contrast of the detection information to Doppler radar detection means, magnetic field monitoring device and ultrasonic positioner three is crossed, is passed throughControl of working unit judges whether current ultrasonic work is normal, and reports error message, makes the inspection of vehicle detecting sensorIt is higher to survey accuracy rate.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings.Herein it should be noted that forThe explanation of these embodiments is used to help understand the present invention, but does not form limitation of the invention.It is in addition, disclosed belowAs long as each embodiment of the invention in involved technical characteristic do not form conflict can each other and be mutually combined.
A kind of vehicle detecting sensor shown in reference picture 1, includes detector for magnetic field, ultrasonic positioner, workMake control unit and Doppler radar detection means, the detector for magnetic field is additionally provided with sound and light detecting servicing unit, instituteState sound and light detecting servicing unit and be connected with sound transducer and light intensity sensor；
Detector for magnetic field：Detected with fixed frequency, establish and record the magnetic field value under inactive state, be designated as justBeginning magnetic field value, and the time that magnetic field starts change is caught, it is designated as the initial change time；
Ultrasonic positioner：Location determination is carried out with fixed frequency, judges and provides on current parking stall whether have carInformation, to calibrate parking stall output state information；
Doppler radar detection means：When detecting changes of magnetic field, Doppler radar detection means is activated, is examined by magnetic fieldThe record of device and Doppler radar detection means complete paired data jointly is surveyed, and the positioning for combining ultrasonic positioner is sentencedIt is disconnected, the parking stall occupied information finally provided；
Control of working unit：By the judged result to Doppler radar detection means and ultrasonic positioner, carry outCurrent data analysis and cumulative data analysis, and this two-part hardware check situation is provided, such as faulty automatic upload is reportedAlert information.
Detector for magnetic field is detected with 0.5Hz frequency.Detector for magnetic field can be magnetic field three-dimensional detection coilSensor.
Ultrasonic positioner carries out location determination with 30 seconds/time of frequency.
Also include receiver apparatus, receiver controls the dormancy of vehicle detecting sensor.
Operation principle：
Under the inactive state of magnetic field, by detector for magnetic field, and ultrasonic positioner, detection unit is collectively constituted；Magnetic fieldThe low in energy consumption and high sensitivity of detection means, is used for quickly detecting with 0.5Hz frequency, it is therefore an objective to establishes and record inactive stateWhen magnetic field value, as information judge foundation, while to catch magnetic field start change time point (namely automobile close to passSensor or the time for preparing to exit sensor)；Ultrasonic positioner, location determination was carried out with 30 seconds each frequencies, providedWhether the information of car is had on current parking stall, to calibrate the parking space state information currently exported；And sound transducer and light intensitySensor can judge whether parking stall has car as the disengaging of auxiliary judgment vehicle with this；
During changes of magnetic field state, Doppler radar detection means is activated, is detected by detector for magnetic field and Doppler radarDevice completes data record jointly, and combines the location data of ultrasonic positioner, provides the occupied information of final parking stall；
Control of working unit, by the judged result to Doppler radar detection means and ultrasonic positioner, carry outCurrent data analysis and cumulative data analysis, and this two-part hardware check situation is provided, such as faulty automatic upload is alarmedInformation.
The course of work：
1. after vehicle detecting sensor installation, vehicle detecting sensor is in a dormant state；In the dormant state every 5Minute sends an inquiry message.
2. after receiver apparatus is started shooting, the inquiry message of vehicle detecting sensor can be replied, now vehicle detection sensesDevice enters static magnetic field monitoring pattern；Pass through the current parking stall status information of ultrasound positioning device amendment simultaneously.
3. when detector for magnetic field has detected changes of magnetic field (vehicle enters parking stall or leaves parking stall), start DopplerRadar detection device, using two parts of detector for magnetic field and Doppler radar detection means, while the parking shape to vehicleState is tracked record；After judging that magnetic field is static (vehicle comes to a complete stop or left), record data is analyzed, while start ultrasonic wave and determinePosition device is detected, and by the comprehensive analysis to three groups of data, finally provides parking stall status information；The analysis of three groups of dataAlso include to the hardware fault judged result of Doppler radar detection means and ultrasonic positioner, as faulty, report clothesBusiness device.
4. after the completion of dynamic magnetic field detection, detected from static magnetic field is newly entered.
5. when the packet that vehicle detecting sensor is actively sent, repeat to send when receiver does not respond to, in 10 seconds, evenContinue 3 times and do not respond to, then vehicle detecting sensor enters resting state.
Detector for magnetic field and Doppler radar detection means are very sensitive to dynamic object, and detector for magnetic field can not be arrangedExcept adjacent parking stall interference problem, Doppler radar detection means can avoid the interference information that adjacent parking stall is got on the car；In this hairBright middle ultrasound positioning device installation on the ground, detects vehicle chassis, due to the shorter inspection that can not realize moving-target of distance upwardsSurvey, but to static target, there is positioning and arbitration functions well, can be whether to there is object to deposit in accurate judgement measurement rangeEffectively solving the problems, such as the adjacent parking stall interference that detector for magnetic field is run into, compensate for Doppler radar detection dressPut in so short distance, to the deficiency of static target detectability.Vehicle detecting sensor is arranged on subsurface, DopplerRadar detection device is detection object from the bottom up so that the visual angle of Doppler radar is sufficiently small, it is ensured that it will not be by adjacentThe interference of mobile object on parking stall.I.e. the present invention makes up magnetic respectively by Doppler radar detection means and ultrasonic positionerDeficiency of the field detection means in dynamic detection and static monitoring techniques, it is accurate further to improve the detection of vehicle detecting sensorRate.
Embodiments of the present invention are explained in detail above in association with accompanying drawing, but the invention is not restricted to described implementationMode.For a person skilled in the art, in the case where not departing from the principle of the invention and spirit, to these embodimentsA variety of change, modification, replacement and modification are carried out, are still fallen within protection scope of the present invention.