CN104050819A - Vehicle flow detecting device and corresponding detecting control method - Google Patents
Vehicle flow detecting device and corresponding detecting control method Download PDFInfo
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Abstract
The invention relates to a vehicle flow detecting device. The device comprises a power module, a power detecting module, a sensor module, a data processing module, a radio frequency receiving and sending module and a data storing module. The sensor module is used for collecting current vehicle state data and buffering the current vehicle state data to the data storing module. The data processing module is used for judging whether the number of vehicle state data in the data storing module exceeds the preset threshold value of the data processing module or not so as to judge whether the vehicle state data change or not after processing the vehicle state data. The radio frequency receiving and sending module is used for sending the processed vehicle state data to an upper computer after the vehicle state data change. The data storing module is used for storing the vehicle state data and radio frequency configuration parameters. The invention further relates to a vehicle flow detecting control method. By means of the vehicle flow detecting device and the corresponding detecting control method, the wireless interference problem and the adjacent lane interference problem of a vehicle detector are solved, product power consumption is reduced, the service life of products is prolonged, and the application range is wide.
Description
Technical field
The present invention relates to field of traffic, relate in particular to Vehicle Engineering, specifically refer to a kind of traffic flow detecting device and detect accordingly control method.
Background technology
In prior art, wireless vehicle pick-up unit mainly contains following characteristics:
1, the wireless communication technology that adopts 315MHz or 433MHz frequency range, this frequency range is wireless vehicle key and intercom frequency range, thereby is easy to be subject to external interference and disturbs other vehicle detection apparatus.
2, adopt magneto-dependent sensor, the interference of facing track due to the too high very difficult judgement of sensitivity.
3, system low-power consumption poor effect, battery can only support 2～3 years.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of and can be used in intelligent traffic light control, the vehicle flowrate that can detect crossing and vehicle and have nil case, solved air interference problem, reduced product power consumption, extended serviceable life, the traffic flow detecting device having wide range of applications of product and detected accordingly control method.
To achieve these goals, traffic flow detecting device of the present invention has following formation:
This traffic flow detecting device, its principal feature is that described device comprises:
Power module, in order to give power supply detection module, sensor assembly, data processing module, radio-frequency (RF) receiving and transmission module and data memory module power supply;
Power supply detection module, in order in the time that vehicle status data does not change, control described sensor assembly and signal processing module and enter dormant state from duty, and after certain hour section, control described sensor assembly and signal processing module and enter duty from dormant state;
Sensor assembly, in order to gather current vehicle status data and by described vehicle status data buffer memory to data memory module;
Data processing module, in order to judge whether the number of vehicle status data in described data memory module exceedes the default minimum data of described data processing module and process number threshold value, and process after described vehicle status data, whether the described vehicle status data of judgement changes;
Radio-frequency (RF) receiving and transmission module, after changing in vehicle status data, is sent to host computer by vehicle status data after treatment;
Data memory module, in order to store described vehicle status data and radio-frequency configuration parameter.
Further, described sensor assembly is magnetoresistive transducer module.
Further, described radio-frequency (RF) receiving and transmission module is 2.45G radio-frequency (RF) receiving and transmission module.
Further, the 3.6V lithium dynamical battery that described power module is 19Ah.
The background information of described signal processing module when without car learnt, and described method comprises the following steps:
(1) described sensor assembly gather current vehicle status data and by described vehicle status data buffer memory to data memory module;
(2) in the data memory module described in described data processing module judgement, whether the number of vehicle status data exceedes the default minimum data processing number threshold value of described data processing module;
(3) if the number of vehicle status data exceedes the default minimum data processing number of described data processing module in described data memory module, continue step (4), otherwise continue step (1);
(4) described signal processing module is processed after described vehicle status data, and whether the described vehicle status data of detection changes;
(5), if described vehicle status data changes, continue step (6), otherwise continue step (8);
(6) after vehicle status data after treatment is sent to host computer by described radio-frequency (RF) receiving and transmission module, automatically enter dormant state, then finish and exit;
(7) sensor assembly and the signal processing module described in described power supply detection module control enters dormant state from duty, and after certain hour section, sensor assembly and signal processing module described in described power supply detection module control enter duty from dormant state.
Further, described sensor assembly gather current vehicle status data and by described vehicle status data buffer memory to data memory module, comprise the following steps:
(1.1) described sensor assembly gathers current magnetic field intensity;
(1.2) described sensor assembly is vehicle status data by the current magnetic field intensity-conversion of collection;
(1.3) described sensor assembly is by extremely described data memory module of described vehicle status data buffer memory.
Further, described data processing module judges whether the number of vehicle status data in described data memory module exceedes the default minimum data of described data processing module and process number, is specially:
Whether the number that described data processing module detects vehicle status data in described data memory module exceedes 10.
Whether further, described signal processing module is processed after described vehicle status data, and detect in described vehicle status data and change, and comprises the following steps:
(4.1) accidental data in the vehicle status data described in described signal processing module filtering;
(4.2) whether described signal processing module detects in the vehicle status data after elimination accidental data and changes.
Further, vehicle status data after treatment is sent to host computer by described radio-frequency (RF) receiving and transmission module, comprises the following steps:
(6.1) described radio-frequency (RF) receiving and transmission module is tested to described vehicle status data;
(6.2) if described radio-frequency (RF) receiving and transmission module is checked successfully described vehicle status data, continue step (6.3), otherwise, step (1) continued;
(6.3) vehicle status data after treatment is sent to host computer by described radio-frequency (RF) receiving and transmission module.
Further, sensor assembly and signal processing module described in described power supply detection module control enter dormant state from duty, and after certain hour section, sensor assembly and signal processing module described in described power supply detection module control enter duty from dormant state, comprise the following steps:
(7.1) power module described in described power supply detection module control stops to described sensor assembly and signal processing module power supply;
(7.2) power module described in described power supply detection module control is given described sensor assembly and signal processing module power supply after 200ms.
Adopt traffic flow detecting device of the present invention and detected accordingly control method, compared with prior art, there is following beneficial effect:
The present invention adopts magnetoresistive transducer collection vehicle status data, adopts radio frequency 2.45G to carry out Wireless Data Transmission simultaneously, has solved the air interference in wireless vehicle flow detection and has faced track interference problem; The present invention adopts power supply detection module to manage power supply, has reduced the power consumption of product, has extended the serviceable life of product, has wide range of applications.
Brief description of the drawings
Fig. 1 is the structural representation of traffic flow detecting device of the present invention.
Fig. 2 a is the vertical view of the shell of traffic flow detecting device of the present invention.
Fig. 2 b is the front view of the shell of traffic flow detecting device of the present invention.
Fig. 3 a is the vertical view of the upper cover of the shell of traffic flow detecting device of the present invention.
Fig. 3 b is the front view of the upper cover of the shell of traffic flow detecting device of the present invention.
Fig. 4 is the circuit diagram of traffic flow detecting device of the present invention.
Fig. 5 be traffic flow detecting device of the present invention without battery time the circuit diagram of JTAG to device power supply.
Fig. 6 is the sensor module circuit diagram of traffic flow detecting device of the present invention.
Fig. 7 is the power module circuitry figure of traffic flow detecting device of the present invention.
Fig. 8 is the flow chart of steps of the method for vehicle Flow Detection control of the present invention.
Fig. 9 is the emissive power spectrogram of the radio-frequency (RF) receiving and transmission module of the method for vehicle Flow Detection control of the present invention.
Figure 10 is the job step process flow diagram of the signal processing module of the method for vehicle Flow Detection control of the present invention.
Embodiment
In order more clearly to describe technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
Refer to shown in Fig. 1 to Fig. 7, traffic flow detecting device of the present invention comprises:
Power module, in order to give power supply detection module, sensor assembly, data processing module, radio-frequency (RF) receiving and transmission module and data memory module power supply;
Power supply detection module, in order in the time that vehicle status data does not change, control described sensor assembly and signal processing module and enter dormant state from duty, and after certain hour section, control described sensor assembly and signal processing module and enter duty from dormant state;
Sensor assembly, in order to gather current vehicle status data and by described vehicle status data buffer memory to data memory module;
Data processing module, in order to judge whether the number of vehicle status data in described data memory module exceedes the default minimum data of described data processing module and process number threshold value, and process after described vehicle status data, whether the described vehicle status data of judgement changes;
Radio-frequency (RF) receiving and transmission module, after changing in vehicle status data, is sent to host computer by vehicle status data after treatment; The functions such as radio-frequency (RF) receiving and transmission module also has data check, position filling.
Data memory module, in order to store described vehicle status data and radio-frequency configuration parameter.
Data memory module is when transmission link breaks down, and traffic flow detecting device can keep current vehicle Flow Detection data, until transmission link recovers normal work, can maintain the stability of the apparatus like this and data consistency.
Refer to shown in Fig. 6, described sensor assembly is magnetoresistive transducer module.
The detection frequency of described sensor is 10～20Hz, in the time that sensor detection frequency is greater than 20Hz, is conventionally applicable to the most road conditions at a high speed and in urban district.
Described radio-frequency (RF) receiving and transmission module is 2.45G radio-frequency (RF) receiving and transmission module, and transmission data transfer rate is 250Kbps, sends a frame time and is less than 2ms, has greatly reduced the interference to other equipment.The emissive power of radio-frequency (RF) receiving and transmission module is 100mw, transmission interval 200ms, and the burst length is 1.5ms, dutycycle is 0.75%.The number of channel is 16, channel spacing is 1MHz, self-adapting frequency modulation, the emissive power of radio frequency is large 5dBm to the maximum, minimum power 0dbm, receiving sensitivity :-96dBm@250kbps, transmission range: in sighting distance situation, reliable communicating is from >=150m (250kbps) working temperature :-40～85 DEG C, and working relative humidity: 10%-90% relative humidity, frozen-free.Suppose average 4.5 meters of vehicle commander, each test data is as shown in table 1 below:
Table 1 sensor test data
| The speed of a motor vehicle (kilometer/hour) | Elapsed time (ms) | Sampling interval (ms) | Accuracy rate | Average current consumption (uA) |
| 150 | 108 | 50 | 95％ | 800 |
| 120 | 135 | 50 | 98％ | 800 |
| 100 | 162 | 50 | 98％ | 800 |
| 80 | 202 | 50 | 99％ | 800 |
| 60 | 270 | 50 | 99％ | 800 |
| 40 | 405 | 100 | 99％ | 400 |
| 20 | 810 | 100 | 99.5％ | 400 |
| <20 | >810 | 1000 | 95％ | 40 |
Refer to shown in Fig. 7, the 3.6V lithium dynamical battery that described power module is 19Ah, power saving effect is fine, is greater than 10 years according to the theoretical life-span of test result.60Ah battery, effectively use capacity is 70%.Useful capacity is 42Ah, and be 42A*1000/0.267mA=18 serviceable life.
Refer to shown in Fig. 9, Current is electric current, and A is ampere, and uA is microampere, mA is milliampere, and 1364sample rate is sampling rate, and DC is average current, and RMS is rms current, LOW is minimum current, and MIN is root mean square minimum current, and High is maximum current, and MAX is root mean square maximum current.
The maximum 30mA of working current of power module of the present invention, under low-power consumption, quiescent current is less than 10uA, and device lifetime is more than 6 years;
Table 2 power module table in serviceable life
| Data report frequency | Service time (year) |
| 3 seconds/time | 3 |
| 1 minute/time | 6 |
| 1 hour/time | 9 |
Referring to shown in following table 3, is the absolute rating table of traffic flow detecting device of the present invention.
The absolute rating table of table 3 traffic flow detecting device
This device need to be arranged in the middle of track, and adjacent lane pick-up unit distance is as far as possible far away, can reduce like this and disturb and wrong report.Installing after pick-up unit, in the place that need to fix stall testing apparatus, sunk type is installed, and need to use rapid-curing cutback cement grouting.
The housing diameter of traffic flow detecting device of the present invention is 70cm × 100cm, nylon 66 materials, and classification of waterproof is IP67.
Refer to shown in Fig. 8 to Figure 10, the background information of described signal processing module when without car learnt, and described method comprises the following steps:
(1) described sensor assembly gather current vehicle status data and by described vehicle status data buffer memory to data memory module;
(2) in the data memory module described in described data processing module judgement, whether the number of vehicle status data exceedes the default minimum data processing number threshold value of described data processing module;
(3) if the number of vehicle status data exceedes the default minimum data processing number of described data processing module in described data memory module, continue step (4), otherwise continue step (1);
(4) described signal processing module is processed after described vehicle status data, and whether the described vehicle status data of detection changes;
(5), if described vehicle status data changes, continue step (6), otherwise continue step (8);
(6) after vehicle status data after treatment is sent to host computer by described radio-frequency (RF) receiving and transmission module, automatically enter dormant state, then finish and exit;
(7) sensor assembly and the signal processing module described in described power supply detection module control enters dormant state from duty, and after certain hour section, sensor assembly and signal processing module described in described power supply detection module control enter duty from dormant state.
Described sensor assembly gather current vehicle status data and by described vehicle status data buffer memory to data memory module, comprise the following steps:
(1.1) described sensor assembly gathers current magnetic field intensity;
(1.2) described sensor assembly is vehicle status data by the current magnetic field intensity-conversion of collection;
(1.3) described sensor assembly is by extremely described data memory module of described vehicle status data buffer memory.
In data memory module described in described data processing module judgement, whether the number of vehicle status data exceedes the default minimum data processing number of described data processing module, is specially:
Whether the number that described data processing module detects vehicle status data in described data memory module exceedes 10, can reduce to greatest extent like this wrong report, improves the accuracy of data.
Refer to shown in Figure 10 intermediateness 1: car having been detected, but be likely noise and shake, is nondeterministic statement.Intermediateness 2: detect and have car but state that car does not leave always.
Whether described signal processing module is processed after described vehicle status data, and detect in described vehicle status data and change, and comprises the following steps:
(4.1) accidental data in the vehicle status data described in described signal processing module filtering;
(4.2) whether described signal processing module detects in the vehicle status data after elimination accidental data and changes.
Vehicle status data after treatment is sent to host computer by described radio-frequency (RF) receiving and transmission module, comprises the following steps:
(6.1) described radio-frequency (RF) receiving and transmission module is tested to described vehicle status data;
(6.2) if described radio-frequency (RF) receiving and transmission module is checked successfully described vehicle status data, continue step (6.3), otherwise, step (1) continued;
(6.3) vehicle status data after treatment is sent to host computer by described radio-frequency (RF) receiving and transmission module.
Sensor assembly and signal processing module described in described power supply detection module control enter dormant state from duty, and after certain hour section, sensor assembly and signal processing module described in described power supply detection module control enter duty from dormant state, comprise the following steps:
(7.1) power module described in described power supply detection module control stops to described sensor assembly and signal processing module power supply;
(7.2) power module described in described power supply detection module control is given described sensor assembly and signal processing module power supply after 200ms.
The present invention is can be for the wireless senser product of the intelligent traffic light control of field of traffic, for detection of the vehicle flowrate at crossing, the information such as vehicle has or not, and sending to traffic lights controller to carry out traffic lights switching differentiation detected information, traffic flow detecting device of the present invention must coordinate traffic flow detecting device base station to use.
Traffic flow detecting device of the present invention in use for some time, can, because power module electric weight exhausts and sends low-voltage alerting signal, now need device for opening again to change power module.
Adopt traffic flow detecting device of the present invention and detected accordingly control method, compared with prior art, there is following beneficial effect:
The present invention adopts magnetoresistive transducer collection vehicle status data, adopts radio frequency 2.45G to carry out Wireless Data Transmission simultaneously, has solved the air interference in wireless vehicle flow detection and has faced track interference problem; The present invention adopts power supply detection module to manage power supply, has reduced the power consumption of product, has extended the serviceable life of product, has wide range of applications.
In this instructions, the present invention is described with reference to its specific embodiment.But, still can make various amendments and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (10)
1. a traffic flow detecting device, is characterized in that, described device comprises:
Power module, in order to give power supply detection module, sensor assembly, data processing module, radio-frequency (RF) receiving and transmission module and data memory module power supply;
Power supply detection module, in order in the time that vehicle status data does not change, control described sensor assembly and signal processing module and enter dormant state from duty, and after certain hour section, control described sensor assembly and signal processing module and enter duty from dormant state;
Sensor assembly, in order to gather current vehicle status data and by described vehicle status data buffer memory to data memory module;
Data processing module, in order to judge whether the number of vehicle status data in described data memory module exceedes the default minimum data of described data processing module and process number threshold value, and process after described vehicle status data, whether the described vehicle status data of judgement changes;
Radio-frequency (RF) receiving and transmission module, after changing in vehicle status data, is sent to host computer by vehicle status data after treatment;
Data memory module, in order to store described vehicle status data and radio-frequency configuration parameter.
2. traffic flow detecting device according to claim 1, is characterized in that, described sensor assembly is magnetoresistive transducer module.
3. traffic flow detecting device according to claim 1, is characterized in that, described radio-frequency (RF) receiving and transmission module is 2.45G radio-frequency (RF) receiving and transmission module.
4. traffic flow detecting device according to claim 1, is characterized in that, the 3.6V lithium dynamical battery that described power module is 19Ah.
5. a method that realizes vehicle Flow Detection control based on device claimed in claim 1, is characterized in that, the background information of described signal processing module when without car learnt, and described method comprises the following steps:
(1) described sensor assembly gather current vehicle status data and by described vehicle status data buffer memory to data memory module;
(2) in the data memory module described in described data processing module judgement, whether the number of vehicle status data exceedes the default minimum data processing number threshold value of described data processing module;
(3) if the number of vehicle status data exceedes the default minimum data processing number of described data processing module in described data memory module, continue step (4), otherwise continue step (1);
(4) described signal processing module is processed after described vehicle status data, and whether the described vehicle status data of detection changes;
(5), if described vehicle status data changes, continue step (6), otherwise continue step (8);
(6) after vehicle status data after treatment is sent to host computer by described radio-frequency (RF) receiving and transmission module, automatically enter dormant state, then finish and exit;
(7) sensor assembly and the signal processing module described in described power supply detection module control enters dormant state from duty, and after certain hour section, sensor assembly and signal processing module described in described power supply detection module control enter duty from dormant state.
6. the method for vehicle Flow Detection control according to claim 5, is characterized in that, described sensor assembly gather current vehicle status data and by described vehicle status data buffer memory to data memory module, comprise the following steps:
(1.1) described sensor assembly gathers current magnetic field intensity;
(1.2) described sensor assembly is vehicle status data by the current magnetic field intensity-conversion of collection;
(1.3) described sensor assembly is by extremely described data memory module of described vehicle status data buffer memory.
7. the method for vehicle Flow Detection control according to claim 5, it is characterized in that, in data memory module described in described data processing module judgement, whether the number of vehicle status data exceedes the default minimum data processing number of described data processing module, is specially:
Whether the number that described data processing module detects vehicle status data in described data memory module exceedes 10.
8. whether the method for vehicle Flow Detection control according to claim 5, is characterized in that, described signal processing module is processed after described vehicle status data, and detect in described vehicle status data and change, and comprises the following steps:
(4.1) accidental data in the vehicle status data described in described signal processing module filtering;
(4.2) whether described signal processing module detects in the vehicle status data after elimination accidental data and changes.
9. the method for vehicle Flow Detection control according to claim 5, is characterized in that, vehicle status data after treatment is sent to host computer by described radio-frequency (RF) receiving and transmission module, comprises the following steps:
(6.1) described radio-frequency (RF) receiving and transmission module is tested to described vehicle status data;
(6.2) if described radio-frequency (RF) receiving and transmission module is checked successfully described vehicle status data, continue step (6.3), otherwise, step (1) continued;
(6.3) vehicle status data after treatment is sent to host computer by described radio-frequency (RF) receiving and transmission module.
10. the method for vehicle Flow Detection control according to claim 5, it is characterized in that, sensor assembly and signal processing module described in described power supply detection module control enter dormant state from duty, and after certain hour section, sensor assembly and signal processing module described in described power supply detection module control enter duty from dormant state, comprise the following steps:
(7.1) power module described in described power supply detection module control stops to described sensor assembly and signal processing module power supply;
(7.2) power module described in described power supply detection module control is given described sensor assembly and signal processing module power supply after 200ms.
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Application publication date: 20140917 |