JP2020149554A - Parking state detection system and parking state detection method - Google Patents

Abstract

To provide a parking state detection system and a parking state detection method capable of suppressing erroneous parking detection even for a vehicle giving a large influence to a magnetic field.SOLUTION: A parking state detection system 10 comprises a sensor device 11, a sensor device 12, and a management device 20. The sensor device 11 including a geomagnetic sensor 111 is arranged in a first parking space. The sensor device 12 including a geomagnetic sensor 121 is arranged in a second parking space close to the first parking space. A fluctuation detection unit 112 of the sensor device 11 detects a first fluctuation value from a fluctuation of an output value of the geomagnetic sensor 111. A fluctuation detection unit 122 of the sensor device 12 detects a second fluctuation value from a fluctuation of an output value of the geomagnetic sensor 121. A calculation unit 201 of the management device 20 detects a parking state of the first parking space or a parking state of the second parking space by using a comparison result of magnitudes of the first fluctuation value and the second fluctuation value.SELECTED DRAWING: Figure 1

Description

The present invention relates to a technique for detecting the presence or absence of parking of a vehicle in a plurality of adjacent parking spaces.

Various devices and systems have been devised to detect the parking state of the parking lot. For example, the vehicle detection method of Patent Document 1 includes a geomagnetic sensor in each parking space.

The output value of the geomagnetic sensor fluctuates from the state where the vehicle is not parked to the state where the vehicle is parked. This vehicle detection method detects the presence or absence of parking from the amount of fluctuation in the output value of the geomagnetic sensor.

Japanese Unexamined Patent Publication No. 2006-164145

However, in the conventional method, when a vehicle having a large influence on the magnetic field stops at a parking space adjacent to the parking space to be detected, the output value of the geomagnetic sensor in the parking space to be detected may fluctuate relatively significantly. .. In this case, the conventional method erroneously detects that the vehicle is parked in the parking space to be detected.

Therefore, an object of the present invention is to provide a parking state detection technique capable of suppressing erroneous parking detection even for a vehicle having a large influence on a magnetic field.

According to an example of the present disclosure, the parking state detection system includes a first geomagnetic sensor, a second geomagnetic sensor, a first fluctuation detection unit, a second fluctuation detection unit, and a calculation unit. The first geomagnetic sensor is arranged in the first parking space. The second geomagnetic sensor is arranged in the second parking space close to the first parking space. The first fluctuation detection unit detects the first fluctuation value from the fluctuation of the output value of the first geomagnetic sensor. The second fluctuation detection unit detects the second fluctuation value from the fluctuation of the output value of the second geomagnetic sensor. The calculation unit detects the parking state of the first parking space or the parking state of the second parking space by using the comparison result of the magnitudes of the first fluctuation value and the second fluctuation value.

In this configuration, even if a vehicle having a strong influence on the magnetic field (strong magnetic field vehicle) is parked in the first parking space, for example, the output value of the first geomagnetic sensor and the output value of the second geomagnetic sensor change. From the difference in size, it is easily detected that the first parking space is parked and the second parking space is empty.

According to an example of the present disclosure, if the first fluctuation value is larger than the second fluctuation value, the calculation unit detects that the vehicle is parked in the first parking space.

In this configuration, a specific example of the above-mentioned detection is shown, and it is utilized that the change in the magnetic field of the parking mass parked by the strong magnetic field vehicle is larger than that of another adjacent parking mass.

According to an example of the present disclosure, when the calculation unit detects that the vehicle is parked in the first parking space, if the second fluctuation value is larger than the first fluctuation value, the second parking space is used. Detects that another vehicle is parked.

In this configuration, if a vehicle is parked in the first parking space and another vehicle stops in the second parking space, the output of the second fluctuation detection unit becomes large. By detecting this, parking of the vehicle in the second parking space is detected.

According to an example of the present disclosure, the calculation unit detects the parking state by using the second fluctuation value within a predetermined period based on the acquisition time of the first fluctuation value.

In this configuration, the parking state can be detected even if the detection time of fluctuation is different for each parking space.

According to an example of the present disclosure, the first fluctuation detection unit and the second fluctuation detection unit output the first fluctuation value and the second fluctuation value to the calculation unit when the fluctuation value exceeds the fluctuation detection threshold value.

In this configuration, the parking state is detected only when there is a high possibility that a change in the parking state has occurred. As a result, the frequency of detection calculations can be suppressed while maintaining the accuracy of parking state detection.

According to an example of the present disclosure, the first fluctuation detection unit and the second fluctuation detection unit update the reference value of the fluctuation value using the fluctuation value when the fluctuation value exceeds the empty vehicle detection threshold value.

In this configuration, the fluctuation value can always be a positive value, and the parking state can be easily detected.

According to an example of the present disclosure, the first fluctuation detection unit and the second fluctuation detection unit output vacant vehicle information to the calculation unit when the fluctuation value is less than the vacant vehicle detection threshold value.

In this configuration, a clear empty vehicle condition is easily detected.

According to an example of the present disclosure, the first geomagnetic sensor and the first fluctuation detection unit are housed in the first sensor device, and the second geomagnetic sensor and the second fluctuation detection unit are housed in the second sensor device. The calculation unit is housed in a management device arranged at a position different from that of the first parking space and the second parking space. The first sensor device, the second sensor device, and the management device each include a communication unit capable of communicating with each other.

In this configuration, the parking condition is detected and monitored at a remote location.

According to an example of the present disclosure, the calculation unit includes a first calculation unit corresponding to the first fluctuation detection unit and a second calculation unit corresponding to the second fluctuation detection unit. The first calculation unit and the second calculation unit send and receive a fluctuation value inquiry notification and a response flag corresponding to the inquiry notification to and from each other. The response flag is a flag indicating the magnitude relationship between the first fluctuation value and the second fluctuation value. The first calculation unit uses the response flag to detect the parking state of the first parking space, and the second calculation unit uses the response flag to detect the parking state of the second parking space.

In this configuration, the parking state is detected individually for each parking mass.

According to the present invention, it is possible to suppress erroneous detection of parking even in a vehicle having a large influence on a magnetic field.

It is a schematic functional block diagram of the parking state detection system which concerns on 1st Embodiment. It is a top view which shows a schematic example of a parking lot. It is a figure which shows an example of the time transition of the output value of a sensor device. It is a figure explaining an example of the detection concept of a parking state. It is a flowchart which shows an example of the processing of a sensor device. It is a flowchart which shows an example of the processing of a management apparatus. It is a schematic functional block diagram of the parking state detection system which concerns on 2nd Embodiment. It is a figure explaining an example of the detection concept of a parking state. (A) is a flowchart showing an example of processing of sending an inquiry notification and receiving a response flag, and (B) is a flowchart showing an example of processing of receiving an inquiry notification and transmitting a response flag. It is a top view which shows a schematic example of the parking lot of a derivative example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

-Application example In addition, an application example of the parking state detection technology according to the present embodiment will be described. FIG. 4 is a diagram illustrating an example of a parking state detection concept.

As shown in FIG. 4, a plurality of parking masses 901, parking masses 902, and parking masses 903 are arranged in the parking lot. The parking mass 901 and the parking mass 902 are adjacent to each other, and the parking mass 902 and the parking mass 903 are adjacent to each other. The sensor device 11 is arranged in the parking mass 901, the sensor device 12 is arranged in the parking mass 902, and the sensor device 13 is arranged in the parking mass 903. The sensor device 11 detects the geomagnetism of the parking mass 901 and outputs the fluctuation amount of the geomagnetism. The sensor device 12 detects the geomagnetism of the parking mass 902 and outputs the fluctuation amount of the geomagnetism. The sensor device 13 detects the geomagnetism of the parking mass 903 and outputs the fluctuation amount of the geomagnetism.

When a vehicle (strong magnetic field vehicle) 90 that has a strong influence on the magnetic field enters the parking mass 902, the sensor device 11, the sensor device 12, and the sensor device 13 each detect the fluctuation of the geomagnetic field and output the fluctuation amount. To do.

The calculation unit 201 (see FIG. 1) (not shown) receives the fluctuation amount from the sensor device 11, the fluctuation amount from the sensor device 12, and the fluctuation amount from the sensor device 13. For example, when the calculation unit 201 receives the fluctuation amount from the sensor device 11, the calculation unit 201 sets a predetermined period T with respect to the reception time t11s of the fluctuation amount. If the calculation unit 201 receives the fluctuation amounts from the other sensor devices 12 within the predetermined period, the calculation unit 201 compares these fluctuation amounts. Further, when the fluctuation amount is received from the sensor device 12, a predetermined period T is set with respect to the reception time t12s of the fluctuation amount. If the calculation unit 201 receives the fluctuation amounts from the other sensor device 11 and the sensor device 13 within a predetermined period, the calculation unit 201 compares these fluctuation amounts. Further, when the fluctuation amount is received from the sensor device 13, a predetermined period T is set with respect to the reception time t13s of the fluctuation amount. If the calculation unit 201 receives the fluctuation amounts from the other sensor devices 12 within the predetermined period, the calculation unit 201 compares these fluctuation amounts.

From the comparison result of these fluctuation amounts, the calculation unit 201 determines that the strong magnetic field vehicle 90 has been stored in the parking mass 902 of the sensor device 12 having the largest fluctuation amount, and the vehicle is stored in the parking mass 901 and the parking mass 903. Judge that it is not done.

With such a configuration, the parking state detection system can accurately determine the parked mass even if a vehicle having a strong influence on the magnetic field (strong magnetic field vehicle) is stored. In addition, the parking state detection system can accurately determine the parking mass in which the vehicle is not stored even though the output value of the geomagnetic sensor fluctuates due to the storage of the strong magnetic field vehicle. That is, the parking lot detection system can suppress erroneous parking detection even when a vehicle that has a large influence on the magnetic field is entered or exited.

-Structure example (first embodiment)
The parking state detection system and the parking state detection method will be described in the first embodiment of the present invention with reference to the drawings. FIG. 1 is a schematic functional block diagram of the parking state detection system according to the first embodiment. FIG. 2 is a plan view showing a schematic example of a parking lot. In this embodiment, an example in which the number of parking cells is 3 and the number of sensor devices is 3, but the number of parking cells can be set as appropriate, and the number of sensor devices is the same as the number of parking cells. All you need is.

As shown in FIG. 1, the parking state detection system 10 includes a sensor device 11, a sensor device 12, a sensor device 13, and a management device 20.

As shown in FIG. 2, the parking lot 900 has a parking lot 901, a parking lot 902, and a parking lot 903. The parking mass 901, the parking mass 902, and the parking mass 903 are arranged side by side in this order.

(Sensor device configuration and schematic processing)
The sensor device 11 includes a geomagnetic sensor 111, a fluctuation detection unit 112, and a communication unit 113. The sensor device 11 is arranged in the parking mass 901. At least the geomagnetic sensor 111 in the sensor device 11 may be arranged in the parking mass 901.

The geomagnetic sensor 111 detects the geomagnetism of the parking mass 901 with orthogonal three-axis components and outputs it to the fluctuation detection unit 112. The geomagnetic sensor 111 detects the geomagnetism at a predetermined sampling cycle.

The fluctuation detection unit 112 calculates the fluctuation value of the geomagnetism. If the fluctuation value is larger than the fluctuation detection threshold THc (see FIG. 3), the fluctuation detection unit 112 outputs to the communication unit 113 as geomagnetic fluctuation information of the parking mass 901. At this time, the fluctuation detection unit 112 includes the fluctuation value in the fluctuation information of the geomagnetism. Further, the fluctuation detection unit 112 may include the detection time of the geomagnetic fluctuation in the geomagnetic fluctuation information. The communication unit 113 transmits the geomagnetic fluctuation information of the parking mass 901 to the management device 20.

The sensor device 12 includes a geomagnetic sensor 121, a fluctuation detection unit 122, and a communication unit 123. The sensor device 12 is arranged in the parking mass 902. At least the geomagnetic sensor 121 in the sensor device 12 may be arranged in the parking mass 902.

The geomagnetic sensor 121 detects the geomagnetism of the parking mass 902 with orthogonal three-axis components and outputs it to the fluctuation detection unit 122. The geomagnetic sensor 121 detects the geomagnetism at a predetermined sampling cycle.

The fluctuation detection unit 122 calculates the fluctuation value of the geomagnetism. If the fluctuation value is larger than the fluctuation detection threshold THc (see FIG. 3), the fluctuation detection unit 122 outputs to the communication unit 123 as geomagnetic fluctuation information of the parking mass 902. At this time, the fluctuation detection unit 122 includes the fluctuation value in the fluctuation information of the geomagnetism. Further, the fluctuation detection unit 122 may include the detection time of the geomagnetic fluctuation in the geomagnetic fluctuation information. The communication unit 123 transmits the geomagnetic fluctuation information of the parking mass 902 to the management device 20.

The sensor device 13 includes a geomagnetic sensor 131, a fluctuation detection unit 132, and a communication unit 133. The sensor device 13 is arranged in the parking mass 903. At least the geomagnetic sensor 131 of the sensor device 13 may be arranged in the parking mass 903.

The geomagnetic sensor 131 detects the geomagnetism of the parking mass 903 with orthogonal three-axis components and outputs it to the fluctuation detection unit 132. The geomagnetic sensor 131 detects the geomagnetism at a predetermined sampling cycle.

The fluctuation detection unit 132 calculates the fluctuation value of the geomagnetism. If the fluctuation value is larger than the fluctuation detection threshold THc (see FIG. 3), the fluctuation detection unit 132 outputs to the communication unit 133 as geomagnetic fluctuation information of the parking mass 903. At this time, the fluctuation detection unit 132 includes the fluctuation value in the fluctuation information of the geomagnetism. Further, the fluctuation detection unit 132 may include the detection time of the geomagnetic fluctuation in the geomagnetic fluctuation information. The communication unit 133 transmits the geomagnetic fluctuation information of the parking mass 903 to the management device 20.

(Configuration and schematic processing of management device 20)
The management device 20 includes a calculation unit 201, a communication unit 202, a storage unit 203, and an antenna 220. The calculation unit 201 is connected to the communication unit 202 and the storage unit 203. The communication unit 202 is connected to the antenna 220.

The communication unit 202 communicates with the communication unit 113 of the sensor device 11, the communication unit 123 of the sensor device 12, and the communication unit 133 of the sensor device 13 via the antenna 220. The communication unit 202 receives the geomagnetic fluctuation information of the parking mass 901 from the communication unit 113, receives the geomagnetic fluctuation information of the parking mass 902 from the communication unit 123, and receives the geomagnetic fluctuation information of the parking mass 903 from the communication unit 133. Receive.

The communication unit 202 detects the reception time and attaches it to each geomagnetic fluctuation information. The communication unit 202 outputs the received geomagnetic fluctuation information to the calculation unit 201.

The calculation unit 201 uses the geomagnetic fluctuation information of the parking mass 901, the geomagnetic fluctuation information of the parking mass 902, and the geomagnetic fluctuation information of the parking mass 903 to park the parking mass 901, the parking mass 902, and the parking mass 903. Detect the condition. At this time, the calculation unit 201 detects the parking state while storing the magnetic fluctuation information of each region in the storage unit 203.

(Relationship between parking condition and output of sensor device)
FIG. 3 is a diagram showing an example of time transition of the output value of the sensor device. Note that FIG. 3 shows an example of the case of the sensor device 11 and the sensor device 12. The upper part of FIG. 3 shows the transition of the parking state to the parking mass 901 and the parking mass 902. The middle part of FIG. 3 shows the time transition of the fluctuation value of the output value of the sensor device 11. The lower part of FIG. 3 shows the time transition of the fluctuation value of the output value of the sensor device 12.

First, the transition of the parking state will be described with reference to the upper part of FIG. First, the state ST11 is a state in which the vehicle is not stored (initial state). Next, the state ST12 is a state in which the strong magnetic field vehicle 90 is stored (parked) in the parking mass 901. The state ST13 indicates a state in which the strong magnetic field vehicle 90 is stored in the parking mass 901 and the vehicle 90W is stored in the parking mass 902. The vehicle 90W is a vehicle that does not significantly affect the magnetic field. The state ST14 is a state in which the vehicle 90W is stored in the parking mass 902 and the strong magnetic field vehicle 90 is discharged. The state ST15 is a state in which the vehicle 90W has been delivered. It is assumed that each state transitions in the order of state ST11, state ST12, state ST13, state ST14, and state ST15.

In the state ST11, since the vehicle is not stored in both the parking mass 901 and the parking mass 902 and the geomagnetism has not changed, the fluctuation amount of the sensor device 11 and the fluctuation amount of the sensor device 12 are extremely small. The sensor device 11 and the sensor device 12 store, for example, an average value of the amount of fluctuation in this state as the initial reference value Dst0.

The sensor device 11 and the sensor device 12 store the empty vehicle detection threshold value THu. Then, the sensor device 11 and the sensor device 12 detect that the fluctuation value is less than the empty vehicle detection threshold value THu, and transmit it to the management device 20. Using such a configuration and processing, the parking state detection system 10 can accurately detect an empty vehicle state.

When the strong magnetic field vehicle 90 enters the parking mass 901 in the state ST12, the fluctuation amount of the sensor device 11 and the fluctuation amount of the sensor device 12 greatly increase. Here, the sensor device 11 and the sensor device 12 set the fluctuation detection threshold THc with respect to the initial reference value Dst0. The sensor device 11 and the sensor device 12 detect that the detected fluctuation amount exceeds the fluctuation detection threshold THc. The sensor device 11 and the sensor device 12 generate geomagnetic fluctuation information by this detection and transmit it to the management device 20. At this time, the sensor device 11 transmits the geomagnetic fluctuation information including the fluctuation amount in the parking mass 901, and the sensor device 12 transmits the geomagnetic fluctuation information including the fluctuation amount in the parking mass 902. After this, the amount of fluctuation stabilizes. The sensor device 11 and the sensor device 12 update and store the reference value Dst1 by using, for example, the average value of the stable fluctuation amount. Dst0 is not updated and is retained.

When the vehicle 90W enters the parking mass 902 in the state ST13, the fluctuation amount of the sensor device 11 hardly increases, but the fluctuation amount of the sensor device 12 increases significantly. The sensor device 12 detects that the amount of fluctuation detected in the state ST13 exceeds the fluctuation detection threshold THc. Based on this detection, the sensor device 12 generates geomagnetic fluctuation information of the parking mass 902 and transmits it to the management device 20. On the other hand, the sensor device 11 does not generate the geomagnetic fluctuation information of the parking mass 901 because the fluctuation amount detected in the state ST13 does not exceed the fluctuation detection threshold THc. After this, the amount of fluctuation stabilizes. The sensor device 11 and the sensor device 12 update and store the reference value Dst1 by using, for example, the average value of the stable fluctuation amount.

When the strong magnetic field vehicle 90 leaves the parking mass 901 in the state ST14, the fluctuation amount of the sensor device 11 and the fluctuation amount of the sensor device 12 greatly increase. The sensor device 11 and the sensor device 12 detect that the detected fluctuation amount exceeds the fluctuation detection threshold THc. The sensor device 11 transmits the geomagnetic fluctuation information including the fluctuation amount in the parking mass 901, and the sensor device 12 transmits the geomagnetic fluctuation information including the fluctuation amount in the parking mass 902. After this, the amount of fluctuation stabilizes. The sensor device 11 and the sensor device 12 update and store the reference value Dst1 by using, for example, the average value of the stable fluctuation amount.

When the vehicle 90W leaves the parking space 902 in the state ST15, the fluctuation amount of the sensor device 11 hardly increases, but the fluctuation amount of the sensor device 12 increases significantly. The sensor device 12 detects that the amount of fluctuation detected in the state ST15 exceeds the fluctuation detection threshold THc. Based on this detection, the sensor device 12 generates geomagnetic fluctuation information of the parking mass 902 and transmits it to the management device 20. On the other hand, the sensor device 11 does not generate the geomagnetic fluctuation information of the parking mass 901 because the fluctuation amount detected in the state ST15 does not exceed the fluctuation detection threshold THc. After that, if there is no new warehousing, the fluctuation amount does not change and becomes substantially constant over a predetermined time. The geomagnetism is always compared with the initial value Dst0, and when the fluctuation amount with Dst0 is smaller than THu, the sensor device 11 and the sensor device 12 detect a constant state of this fluctuation amount and set the reference value Dst1 as the initial value. Reset to.

In this way, the sensor device 11 and the sensor device 12 transmit fluctuation information to the management device 20 when the strong magnetic field vehicle 90 enters or leaves the parking mass 901. Further, the sensor device 12 transmits fluctuation information to the management device 20 when the vehicle 90W enters or leaves the parking mass 902.

The management device 20 uses these fluctuation information to detect the entry or exit of the strong magnetic field vehicle 90 and the entry or exit of the vehicle 90W. Specifically, the management device 20 can detect the entry or exit of the vehicle 90W into the parking mass 902 by obtaining the fluctuation information only from the sensor device 12. On the other hand, the management device 20 detects the entry or exit of the strong magnetic field vehicle 90 into the parking mass 901 by adopting the following processing using the fluctuation information of the sensor device 11 and the fluctuation information of the sensor device 12. it can.

(Specific processing of the management device 20)
FIG. 4 is a diagram illustrating an example of a parking state detection concept. FIG. 4 shows the states at the time of entering and leaving the strong magnetic field vehicle 90 into the parking mass 902.

When the strong magnetic field vehicle 90 enters the parking mass 902, the sensor device 11, the sensor device 12, and the sensor device 13 each transmit fluctuation information to the management device 20. In the case of FIG. 4, the fluctuation information from the sensor device 11, the fluctuation information from the sensor device 12, and the fluctuation information from the sensor device 13 are received by the management device 20 in this order.

When the management device 20 receives the fluctuation information from the sensor device 11, the management device 20 detects the reception time t11s. The management device 20 sets a comparison target period T1 having a predetermined time length with reference to the reception time (acquisition time) t11s. The comparison target period T1 has a predetermined time length in the previous time and the later time, for example, on the time axis with the reception time t11s as a reference.

When the management device 20 receives the fluctuation information from the sensor device 12, the management device 20 detects the reception time t12s. If the reception time t12s is within the comparison target period T1 based on the reception time t11s, the management device 20 compares the fluctuation value from the sensor device 11 with the fluctuation value from the sensor device 12. The management device 20 detects and stores that the fluctuation value from the sensor device 12 is larger than the fluctuation value from the sensor device 11. Further, the management device 20 sets a comparison target period T2 having a predetermined time length based on the reception time (acquisition time) t12s. The comparison target period T2 has a predetermined time length in the previous time and the later time, for example, on the time axis with the reception time t12s as a reference.

When the management device 20 receives the fluctuation information from the sensor device 13, the management device 20 detects the reception time t13s. The management device 20 compares the fluctuation value from the sensor device 12 with the fluctuation value from the sensor device 13 if the reception time t13s is within the comparison target period T2 based on the reception time t12s. The management device 20 detects and stores that the fluctuation value from the sensor device 12 is larger than the fluctuation value from the sensor device 13. Further, the management device 20 sets a comparison target period T3 having a predetermined time length based on the reception time (acquisition time) t13s. The comparison target period T3 has a predetermined time length in the previous time and the later time, for example, on the time axis with the reception time t13s as a reference.

The management device 20 detects that the strong magnetic field vehicle 90 has entered the parking mass 902 from the above-mentioned comparison result that the fluctuation value from the sensor device 12 is larger than the fluctuation value from the sensor device 11 and the sensor device 13. .. As described above, by using the configuration of the present embodiment, the warehousing of the strong magnetic field vehicle 90 can be accurately detected.

Next, when the strong magnetic field vehicle 90 leaves the parking mass 902, the sensor device 11, the sensor device 12, and the sensor device 13 transmit fluctuation information to the management device 20 respectively. In the case of FIG. 4, the fluctuation information from the sensor device 13, the fluctuation information from the sensor device 12, and the fluctuation information from the sensor device 11 are received by the management device 20 in this order.

When the management device 20 receives the fluctuation information from the sensor device 13, the management device 20 detects the reception time t13e. The management device 20 sets a comparison target period T3 having a predetermined time length with reference to the reception time (acquisition time) t13e. The comparison target period T3 has, for example, a predetermined time length in the previous time and the later time with respect to the reception time t13e on the time axis.

When the management device 20 receives the fluctuation information from the sensor device 12, the management device 20 detects the reception time t12e. If the reception time t12e is within the comparison target period T3 based on the reception time t13e, the management device 20 compares the fluctuation value from the sensor device 13 with the fluctuation value from the sensor device 12. The management device 20 detects and stores that the fluctuation value from the sensor device 12 is larger than the fluctuation value from the sensor device 13. Further, the management device 20 sets a comparison target period T2 having a predetermined time length based on the reception time (acquisition time) t12e. The comparison target period T2 has a predetermined time length in the previous time and the later time, for example, on the time axis with the reception time t12e as a reference.

When the management device 20 receives the fluctuation information from the sensor device 11, the management device 20 detects the reception time t11e. The management device 20 compares the fluctuation value from the sensor device 12 with the fluctuation value from the sensor device 11 if the reception time t11e is within the comparison target period T2 based on the reception time t12e. The management device 20 detects and stores that the fluctuation value from the sensor device 12 is larger than the fluctuation value from the sensor device 11. Further, the management device 20 sets a comparison target period T1 having a predetermined time length based on the reception time (acquisition time) t11e. The comparison target period T1 has a predetermined time length in the previous time and the later time, for example, on the time axis with the reception time t11e as a reference.

The management device 20 detects that the strong magnetic field vehicle 90 has been delivered from the parking mass 902 from the above-mentioned comparison result that the fluctuation value from the sensor device 12 is larger than the fluctuation value from the sensor device 11 and the sensor device 13. .. As described above, by using the configuration of the present embodiment, the delivery of the strong magnetic field vehicle 90 can be accurately detected.

As described above, by using the configuration and processing of the present embodiment, the parking state detection system 10 can be used for the strong magnetic field vehicle 90 and for the vehicle 90W which does not significantly affect the magnetic field. It is possible to accurately detect the receipt or delivery of goods.

(Processing flow of sensor device)
In order to realize the above-mentioned processing, the sensor device executes the following processing flow. FIG. 5 is a flowchart showing an example of processing of the sensor device. The specific contents of the processing are described above, and detailed explanations will be omitted except where necessary. Further, although the sensor device 11 is shown as an example below, the sensor device 12 and the sensor device 13 also perform the same processing.

The sensor device 11 measures (detects) the orthogonal triaxial components of the geomagnetism (S11). The sensor device 11 calculates the difference (fluctuation value SC) of the measured value of the geomagnetism (output value of the geomagnetic sensor) with respect to the reference value Dst0 (S12).

If the fluctuation value SC is less than the vacant vehicle detection threshold value Tu (S13; YES), the sensor device 11 transmits the vacant vehicle determination to the management device 20 (S14). The sensor device 11 resets the reference value Dst1 to the initial value (= Dst0) (S15).

If the fluctuation value SC is equal to or higher than the empty vehicle detection threshold value Tu (S13; No), the sensor device 11 compares the difference between the geomagnetic measurement values (variation value SC) with respect to the reference value Dst1 and the fluctuation detection threshold value THc (S16). .. If the fluctuation value SC is larger than the fluctuation detection threshold THc (S17), the sensor device 11 transmits the fluctuation information to the management device 20 (S18). Then, the sensor device 11 updates the reference value Dst1 with the stable value (measured value) of the fluctuation value after the fluctuation (S19).

(Processing flow of management device)
In order to realize the above-mentioned processing, the management device executes the following processing flow. FIG. 6 is a flowchart showing an example of processing of the management device. The specific contents of the processing are described above, and detailed explanations will be omitted except where necessary.

The management device 20 waits for the reception of the fluctuation information (S21), and if it receives the vacant vehicle determination (S22: YES), sets the vacant vehicle state (S23).

If the management device 20 has not received the empty vehicle determination (S22: NO), the management device 20 compares the received fluctuation value SCm with the strong magnetic field detection threshold THsc. If the fluctuation value SCm does not exceed the strong magnetic field detection threshold THsc (S24: NO), the management device 20 does not compare with the fluctuation value SCa of other sensor devices and reverses the parking state (S27). If the fluctuation value SCm exceeds the strong magnetic field detection threshold THsc (S24: YES), the management device 20 receives fluctuation information from a plurality of adjacent sensor devices (S25).

The management device 20 compares the fluctuation value SCm of the fluctuation information of one sensor device with the fluctuation value SCa of the fluctuation information of the other sensor device. If the fluctuation value SCm is larger than the fluctuation value SCa (S26: YES), the management device 20 reverses the parking state of the parking mass of the sensor device corresponding to the fluctuation value SCm (S27). If the fluctuation value SCm is smaller than the fluctuation value SCa (S26: NO), the management device 20 maintains the parking state of the parking mass of the sensor device corresponding to the fluctuation value SCm (S28). Although it is possible not to perform the comparison process between the fluctuation value SCa and the strong magnetic field detection threshold THsc, it is preferable to perform the comparison process. As a result, it is possible to detect whether the fluctuation value SCa is due to the strong magnetic field vehicle 90 or the vehicle 90W, and it is possible to detect the parking state according to the detection result.

(Second Embodiment)
The parking state detection system and the parking state detection method will be described in the second embodiment of the present invention with reference to the drawings. FIG. 7 is a schematic functional block diagram of the parking state detection system according to the second embodiment.

As shown in FIG. 7, in the parking state detection system 10A according to the second embodiment, the management device 20 is omitted from the parking state detection system 10 according to the first embodiment, and each sensor device is a calculation unit. It differs in that it has. Other configurations of the parking state detection system 10A are the same as those of the parking state detection system 10, and the description of the same parts will be omitted.

The parking state detection system 10A includes a sensor device 11A, a sensor device 12A, and a sensor device 13A. The sensor device 11A includes a geomagnetic sensor 111, a fluctuation detection unit 112, a communication unit 113, and a calculation unit 114. That is, the sensor device 11A includes a configuration in which a calculation unit 114 is additionally connected between the fluctuation detection unit 112 and the communication unit 113 in the sensor device 11. The sensor device 12A includes a geomagnetic sensor 121, a fluctuation detection unit 122, a communication unit 123, and a calculation unit 124. That is, the sensor device 12A includes a configuration in which the calculation unit 124 is additionally connected between the fluctuation detection unit 122 and the communication unit 123 in the sensor device 12. The sensor device 13A includes a geomagnetic sensor 131, a fluctuation detection unit 132, a communication unit 133, and a calculation unit 134. That is, the sensor device 13A includes a configuration in which a calculation unit 134 is additionally connected between the fluctuation detection unit 132 and the communication unit 133 in the sensor device 13.

The calculation unit 114, the calculation unit 124, and the calculation unit 134 respectively detect the parking state of the parking mass corresponding to the sensor device 11A, the sensor device 12A, and the sensor device 13A.

FIG. 8 is a diagram illustrating an example of a parking state detection concept. Note that FIG. 8 shows a detection concept when the strong magnetic field vehicle 90 enters the garage, but detection can be performed using the same concept at the time of warehousing. Further, in the following, only the parts different from the first embodiment (in the case of FIG. 4) will be described.

As shown in FIG. 8, when the sensor device 11A detects a fluctuation exceeding the fluctuation detection threshold THc, the sensor device 11A transmits an inquiry notification AB1 to the sensor device 12A adjacent to the parking mass. The inquiry notification AB1 includes the fluctuation value of the sensor device 11A and the comparison target period T1.

When the sensor device 12A receives the inquiry notification AB1 of the sensor device 11A and detects a fluctuation exceeding the fluctuation detection threshold THc, the sensor device 12A generates a response flag BA1 for the sensor device 11A. At this time, the sensor device 12A generates the response flag BA1 when the detection of the fluctuation of the own device is within the comparison target period T1. The response flag BA1 includes a comparison result between the fluctuation value of the sensor device 12A and the fluctuation value of the sensor device 11A. In this case, since the fluctuation value of the sensor device 11A (the fluctuation value included in the inquiry notification) is smaller than the fluctuation value of the sensor device 12A, the response flag BA1 includes information (small).

The sensor device 11A receives the response flag BA1. The sensor device 11A detects from the response flag BA1 that the fluctuation value of the sensor device 11A is smaller than the fluctuation value of the sensor device 12A, and maintains the parked state (empty vehicle in the case of FIG. 8).

The sensor device 12A transmits the inquiry notification BA2 to the sensor device 11A adjacent to the parking mass. The inquiry notification BA2 includes the fluctuation value of the sensor device 12A and the comparison target period T2.

When the sensor device 11A receives the inquiry notification BA2 of the sensor device 12A, the sensor device 11A generates a response flag AB2 for the sensor device 12A. At this time, the sensor device 11A generates the response flag AB2 when the detection of the fluctuation of the own device is within the comparison target period T2. The response flag AB2 includes a comparison result between the fluctuation value of the sensor device 11A and the fluctuation value of the sensor device 12A. In this case, since the fluctuation value of the sensor device 12A (the fluctuation value included in the inquiry notification) is larger than the fluctuation value of the sensor device 11A, the response flag AB2 includes the information (large).

The sensor device 12A receives the response flag AB2. The sensor device 12A detects and stores from the response flag AB2 that the fluctuation value of the sensor device 12A is larger than the fluctuation value of the sensor device 11A.

The sensor device 12A transmits the inquiry notification BC2 to the sensor device 13A adjacent to the parking mass. The inquiry notification BC2 includes the fluctuation value of the sensor device 12A and the comparison target period T2.

When the sensor device 13A receives the inquiry notification BC2 of the sensor device 12A, the sensor device 13A generates a response flag CB2 for the sensor device 12A. At this time, the sensor device 13A generates the response flag CB2 when the detection of the fluctuation of the own device is within the comparison target period T2. The response flag CB2 includes a comparison result between the fluctuation value of the sensor device 13A and the fluctuation value of the sensor device 12A. In this case, since the fluctuation value of the sensor device 12A (the fluctuation value included in the inquiry notification) is larger than the fluctuation value of the sensor device 13A, the response flag CB2 includes information (large).

The sensor device 12A receives the response flag CB2. The sensor device 12A detects and stores from the response flag CB2 that the fluctuation value of the sensor device 12A is larger than the fluctuation value of the sensor device 13A.

Then, the sensor device 12A detects that the fluctuation value of the sensor device 12A is larger than the fluctuation value of the sensor device 11A and the sensor device 13A by all the received response flags, and reverses the parking state (in the case of FIG. 8). Change from empty to full).

The sensor device 13A transmits the inquiry notification CB3 to the sensor device 12A adjacent to the parking mass. The inquiry notification CB3 includes the fluctuation value of the sensor device 13A and the comparison target period T3.

When the sensor device 12A receives the inquiry notification CB3 of the sensor device 13A, the sensor device 12A generates a response flag BC3 for the sensor device 13A. At this time, the sensor device 12A generates the response flag BC3 when the detection of the fluctuation of the own device is within the comparison target period T3. The response flag BC3 includes a comparison result between the fluctuation value of the sensor device 13A and the fluctuation value of the sensor device 12A. In this case, since the fluctuation value of the sensor device 13A (the fluctuation value included in the inquiry notification) is smaller than the fluctuation value of the sensor device 12A, the response flag BC3 includes information (small).

The sensor device 13A receives the response flag BC3. The sensor device 13A detects from the response flag BC3 that the fluctuation value of the sensor device 13A is smaller than the fluctuation value of the sensor device 12A, and maintains the parked state (empty vehicle in the case of FIG. 8).

By using such a configuration and processing, each sensor device can accurately detect the parking state of the parking mass corresponding to each sensor device without using the management device 20, that is, the host system.

When realizing such a process, each sensor device executes the following process. FIG. 9A is a flowchart showing an example of processing for transmitting an inquiry notification and receiving a response flag, and FIG. 9B is a flowchart showing an example of processing for receiving an inquiry notification and transmitting a response flag. is there.

As shown in FIG. 9A, when the sensor device detects the fluctuation information (S31), the sensor device transmits an inquiry notification to the surrounding sensor devices (at least the sensor device adjacent to the parking mass) (S32).

When the sensor device receives the response flag from the peripheral sensor device (S33), the sensor device detects the information of the response flag. If the information (large), the sensor device reverses the parking state (S34: large) (S35). If the information (small), the sensor device maintains the parked state (S34: small).

As shown in FIG. 9B, when the sensor device receives the inquiry notification from the peripheral sensor devices (S41), the sensor device compares the fluctuation value of the own device with the fluctuation value of the inquiry notification (S42). If the fluctuation value of the own device is large (S43: large), that is, if the fluctuation value included in the inquiry notification is smaller than the fluctuation value of the own device, the sensor device transmits a response flag containing information (small) ( S44). If the fluctuation value of the own device is small (S43: small), that is, if the fluctuation value included in the inquiry notification is larger than the fluctuation value of the own device, the sensor device transmits a response flag containing information (large) ( S45).

(Derived example of parking lot detection system and parking lot detection method)
In each of the above-described embodiments, a mode in which a plurality of parking cells are arranged in a row is shown. However, as shown in FIG. 10, the above-described configuration and processing can be applied even when a plurality of parking cells are arranged in two dimensions. FIG. 10 is a plan view showing a schematic example of a parking lot of a derivative example.

As shown in FIG. 10, the parking lot 900A includes a parking lot 901, a parking lot 902, a parking lot 903, a parking lot 904, a parking lot 905, and a parking lot 906. The parking mass 901, the parking mass 902, and the parking mass 903 are arranged in a row, and the parking mass 904, the parking mass 905, and the parking mass 906 are arranged in a row. These rows are arranged in parallel. The parking mass 901 and the parking mass 904 are adjacent to each other, the parking mass 902 and the parking mass 905 are adjacent to each other, and the parking mass 903 and the parking mass 906 are adjacent to each other.

The sensor device 11 is arranged in the parking mass 901, the sensor device 12 is arranged in the parking mass 902, and the sensor device 13 is arranged in the parking mass 903. A sensor device 14 is arranged in the parking mass 904, a sensor device 15 is arranged in the parking mass 905, and a sensor device 16 is arranged in the parking mass 906.

In such a configuration, the parking lot detection system may compare the fluctuation values of the adjacent sensor devices in each of the two dimensions. For example, with respect to the sensor device 12, the sensor device 11, the sensor device 13, and the sensor device 15 may be compared. Moreover, the sensor device adjacent in the oblique direction may be included in the comparison target. For example, with respect to the sensor device 12, the sensor device 14 and the sensor device 16 may be further compared.

10, 10A: Parking state detection system 11, 11A, 12, 12A, 13, 13A, 14, 15, 16: Sensor device 20: Management device 90: Strong magnetic field vehicle 90W: Vehicle 111, 121, 131: Geomagnetic sensor 112, 122, 132: Fluctuation detection unit 113, 123, 133: Communication unit 114, 124, 134: Calculation unit 201: Calculation unit 202: Communication unit 203: Storage unit 220: Antenna 900, 900A: Parking lot 901, 902, 903, 904, 905, 906: Parking lot

Claims (14)

The first geomagnetic sensor placed in the first parking space and
A second geomagnetic sensor arranged in a second parking space close to the first parking space,
A first fluctuation detection unit that detects the first fluctuation value of the output value of the first geomagnetic sensor, and
A second fluctuation detection unit that detects the second fluctuation value of the output value of the second geomagnetic sensor, and
Using the comparison result of the magnitudes of the first fluctuation value and the second fluctuation value, a calculation unit for detecting the parking state of the first parking mass or the parking state of the second parking mass, and
A parking status detection system. The calculation unit
If the first fluctuation value is larger than the second fluctuation value, it is detected that the vehicle is parked in the first parking space.
The parking state detection system according to claim 1. The calculation unit
When it is detected that a vehicle is parked in the first parking space, if the second fluctuation value is larger than the first fluctuation value, another vehicle is parked in the second parking space. To detect,
The parking state detection system according to claim 2. The calculation unit
The parking state is detected by using the second fluctuation value within a predetermined period based on the acquisition time of the first fluctuation value.
The parking state detection system according to any one of claims 1 to 3. The first fluctuation detection unit and the second fluctuation detection unit
When the fluctuation value exceeds the fluctuation detection threshold value, the first fluctuation value and the second fluctuation value are output to the calculation unit.
The parking state detection system according to any one of claims 1 to 4. The first fluctuation detection unit and the second fluctuation detection unit
When the fluctuation value exceeds the empty vehicle detection threshold value, the reference value of the fluctuation value is updated using the fluctuation value.
The parking state detection system according to any one of claims 1 to 5. The first fluctuation detection unit and the second fluctuation detection unit
When the fluctuation value is less than the vacant vehicle detection threshold value, the vacant vehicle information is output to the calculation unit.
The parking state detection system according to any one of claims 1 to 6. The first geomagnetic sensor and the first fluctuation detection unit are housed in the first sensor device.
The second geomagnetic sensor and the second fluctuation detection unit are housed in the second sensor device.
The calculation unit is housed in a management device arranged at a position different from that of the first parking space and the second parking space.
The first sensor device, the second sensor device, and the management device each include a communication unit capable of communicating with each other.
The parking state detection system according to any one of claims 1 to 7. The calculation unit
The first calculation unit corresponding to the first fluctuation detection unit and
It has a second calculation unit corresponding to the second fluctuation detection unit, and has.
The first calculation unit and the second calculation unit are
A variable value inquiry notification and a response flag corresponding to the inquiry notification are transmitted and received to each other.
The response flag is a flag indicating the magnitude relationship between the first fluctuation value and the second fluctuation value.
The first calculation unit detects the parking state of the first parking mass by using the response flag.
The second calculation unit detects the parking state of the second parking mass by using the response flag.
The parking state detection system according to any one of claims 1 to 7. The first geomagnetic sensor arranged in the first parking mass detects the geomagnetism of the first parking mass,
A second geomagnetic sensor arranged in the second parking space close to the first parking space detects the geomagnetism of the second parking space.
The first fluctuation detection unit detects the first fluctuation value of the output value of the first geomagnetic sensor, and then
The second fluctuation detection unit detects the second fluctuation value of the output value of the second geomagnetic sensor, and then
The calculation unit detects the parking state of the first parking space or the parking state of the second parking space by using the comparison result of the magnitudes of the first fluctuation value and the second fluctuation value.
Parking status detection method. If the first fluctuation value is larger than the second fluctuation value, the calculation unit detects that the vehicle is parked in the first parking space.
The parking state detection method according to claim 10. When the calculation unit detects that a vehicle is parked in the first parking space, if the second fluctuation value is larger than the first fluctuation value, another vehicle is in the second parking space. Detects that you are parked,
The parking state detection method according to claim 11. The calculation unit detects the parking state by using the second fluctuation value within a predetermined period based on the acquisition time of the first fluctuation value.
The parking state detection method according to any one of claims 10 to 12. When the fluctuation value exceeds the empty vehicle detection threshold value, the first fluctuation detection unit and the second fluctuation detection unit update the reference value of the fluctuation value using the fluctuation value.
The parking state detection method according to any one of claims 10 to 13.

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