JP2010006156A - Preventive safety system, master station and slave station thereof, and preventive safety method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a preventive safety system which realizes both comfortability and safety of a driver, a master station and slave station thereof, and a preventive safety method. <P>SOLUTION: The preventive safety system comprises a sensor/measuring device which is mounted on each vehicle to measure the state of a vehicle itself and surrounding environment of the vehicle, a slave station connected with a vehicle-mounted safety device for protecting a driver besides informing a driver whether or not safety is assured, and a master station for receiving safety relevant information which is a result transmitted from the slave station and measured by the sensor/measuring device, executing statistical analysis on the basis of the safety relevant information and timely transmitting a set value of the safety device indicating operation start to the safety device. The slave station transmits the safety relevant information to the master station besides recording the safety relevant information on the recording part when a detection level generated on the basis of the measured result of the sensor/measuring device is not smaller than a level of the set value of the safety device set in advance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a preventive safety technique for updating the setting of a safe operation threshold timely in accordance with the state of a vehicle and the surrounding environment.

Conventionally, there is a preventive safety device that controls a vehicle when the distance from the vehicle ahead becomes short while the vehicle is traveling or when the vehicle departs from a white line.
However, the operation threshold value provided for controlling the operation of such a preventive safety device is a stand-alone device that is fixed or variable based on a measurement result of an environment measurement device mounted on a vehicle. Therefore, there are problems that the setting of the operation threshold is not suitable for the driver, bothering trouble (sensitivity reaction of the preventive safety device) and optimization of ensuring safety are insufficient.

  According to Patent Document 1, in a dozing alarm system, a signal from a steering sensor is input to a dozing detection logic unit, and an alarm device is driven when a dozing state is determined based on a steering pattern. The corresponding operation status by the driving operation detection unit with respect to the change in the inter-vehicle distance obtained by the surrounding environment measuring device and the state change detection unit is determined by the operation correspondence degree determination unit. The dozing detection logic unit changes its detection logic according to the normality / abnormality judgment result from the operation correspondence degree judgment unit, and when the driver is normal, the sensitivity of the dozing operation detection is lowered and an unnecessary false alarm is issued. If the driver is in an abnormal state, the sensitivity is increased and a doze alarm is given early. In a drowsy driving alarm device or the like, a proposal has been made so that an alarm can be issued earlier in an abnormal state according to a change in a driver's state.

According to Patent Document 2, the safety device includes obstacle detection means for detecting obstacles around the host vehicle, and a vehicle for detecting situations such as speed, acceleration, rollover, sudden braking, sudden turn, and skidding of the host vehicle. A situation detection means and a risk judgment means for receiving information from the obstacle detection means and / or the vehicle situation detection means and determining the danger level of the obstacle to the host vehicle and / or the danger level of the host vehicle alone are provided. Furthermore, a seat belt device having a belt adjusting means is provided, and the area and / or shape of the contact portion between the belt and the occupant is changed according to the risk level information from the risk determination means. Furthermore, it detects the physical characteristics of the occupant sitting on the seat corresponding to the above-mentioned seat belt device, or stores the occupant discrimination around the occupant discriminating vehicle or the vehicle itself, and predicts the risk of the obstacle event. Safety devices have been proposed that give warnings to passengers and give them more appropriate protection.
Japanese Patent Laid-Open No. 06-156262 JP 2001-55105 A

  The main station accumulates safety-related information sent from each vehicle, and performs a statistical analysis based on the accumulated safety-related information. The purpose is to provide a preventive safety system and a preventive safety system master station and slave stations, and a preventive safety method that balances the comfort and safety of the driver by adjusting the operation threshold of the installed slave stations. And

A preventive safety system which is one aspect includes a slave station mounted on a vehicle and a master station that performs wireless communication with the slave station. The slave station reports to the driver installed in the vehicle whether or not it is safe, and a sensor / measurement device that measures the situation of the vehicle itself and the surrounding environment of the vehicle installed for each vehicle. And a safety device that protects the driver. The master station receives safety-related information that is a result of measurement by the sensor / measurement device transmitted from the slave station, performs statistical analysis based on the safety-related information, and indicates an operation start to the safety device The set value of the safety device is transmitted in a timely manner. In addition, the slave station records the safety-related information if the detection level generated based on the measurement result of the sensor / measurement device is equal to or greater than the preset value of the set value of the safety device. And the safety related information is transmitted to the master station.

  When the master station changes the level of the set value of the safety device of the vehicle that is the source of the safety-related information, the average statistical data of the source vehicle and all of the registered vehicles The average of the statistical data is compared, and a predetermined level is added to the average of the detection levels of all the vehicles based on the comparison result to obtain the set value of the safety device.

  The statistical data includes an average of detection levels, an average of detection levels per unit distance, an average of detection levels classified by time zone, weather, location, road conditions, etc., an average of detection levels of accident vehicles, and detection for each biological information. It is one of the average level.

The slave station transmits the safety-related information to the parent station when the safety-related information is stored for a certain time or a certain amount.
With the above configuration, it is a system rather than a stand-alone device of a single vehicle, grasps the operating status of all vehicles, and adjusts the threshold of the safety device according to the status from the statistical data, thereby improving driver comfort and safety Optimization can be done.

  By storing the safety-related information sent from each vehicle in the master station, performing statistical analysis based on the stored safety-related information, and adjusting the operation threshold of the slave station installed in each vehicle from the master station It is possible to achieve both driver comfort and safety.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a preventive safety system. The preventive safety system includes a master station 1 (vehicle information processing center) and a slave station 2 mounted on each vehicle (vehicles A to C). 1A shows safety-related information, which will be described later, including information such as “detection level (danger recognition level)”, “vehicle position”, “temperature”, “humidity”, and “weather” collected by the slave station 2. It is a figure which shows that the station 2 transmits. 1B executes processing such as statistical analysis based on safety-related information collected in the master station 1, and transmits a set value (preventive safety operation threshold) of a safety device, which will be described later, to the slave station 2 as a result thereof. FIG.

  FIG. 2 is a diagram showing the configuration of the master station 1 and the slave station 2. 2A shows the configuration of the master station 1, and the master station 1 includes an antenna 21, a transmission / reception unit 22, an arithmetic processing unit 23 (such as a CPU), and a recording unit 24. The arithmetic processing unit 23 includes a control unit 25 and a statistical analysis unit 26. FIG. 2B shows the configuration of the slave station 2, and the slave station 2 includes an antenna 31, a transmission / reception unit 32, a control unit 33, and a recording unit 34.

  The master station 1 can communicate with the slave station 2 of each vehicle, and the master station 1 accumulates and analyzes safety-related information from each slave station 2. In addition, a data communication device (for example, G-BOOK or the like) is mounted on the slave station 2 of each vehicle. The slave station 2 can transmit safety-related information to the master station 1 periodically or when a danger is detected.

  The transmission / reception unit 22 receives and demodulates the radio wave having safety-related information transmitted from the slave station 2 of each vehicle received via the antenna 21. Thereafter, the demodulated data is transferred to the control unit 25 of the arithmetic processing unit 23. Moreover, the setting value of the safety device of each vehicle which is a result of calculation using the arithmetic processing unit 23 (programmable device such as a CPU) and the recording unit 24 is transmitted.

  The control unit 25 of the arithmetic processing unit 23 controls each unit of the master station, extracts safety-related information from the received data, transfers the safety-related information to the statistical analysis unit 26, and the result of calculation by the statistical analysis unit 26 Is used to generate a set value for the safety device and transmit it to the slave station 2.

The statistical analysis unit 26 calculates statistical data such as “average value of detection levels of each vehicle” and “average value of detection levels of all vehicles”, which will be described later, and records them in the recording unit 24.
Note that the arithmetic processing unit 23 and the recording unit 24 of the master station 1 may use a PC or a server.

  Further, the transmission / reception unit 32 mounted on the vehicle receives and demodulates the transmission signal transmitted from the master station 1 from the antenna 31, and also generates vehicle data generated by the control unit 33 (programmable device such as a CPU). Modulate and transmit to the master station 1 via the antenna 31.

A mobile phone or the like may be used as the transmission / reception unit 32 of the slave station 2.
The control unit 33 is connected to a sensor / measurement device 35, a safety device 36, and the like. And the control part 33 produces | generates safety relevant information based on the information which the sensor and the measuring apparatus 35 measured or acquired while controlling each part of the sub_station | mobile_unit 2. As shown in FIG. Further, the set value of the safety device of the safety device 36 is updated in a timely manner based on the data sent from the master station 1.

The sensor / measurement device 35 is a vehicle speed sensor, an acceleration sensor, a millimeter wave radar, or the like, and the safety device 36 is a pre-crash alarm, a pre-crash brake, a pre-crash seat belt, or the like.
(Operation on the slave station side)
The operation of the slave station 2 mounted on the vehicle will be described.

FIG. 3 is a flowchart showing the operation of the slave station 2.
In step S1, it is determined whether the slave station 2 has received the data transmitted from the master station 1. If data has been received from the master station 1, the process proceeds to step S2, and if not received, the process proceeds to step S3. A transmission signal transmitted by radio in order to update the set value of the safety device from the master station 1 is input to the transmission / reception unit 32 via the antenna 31 of the slave station 2 and demodulated, and the control unit 33 uses the demodulated data. It is determined whether the data is from the master station 1.

  In step S2, the power supply voltage is checked to determine whether the vehicle is stopped (engine off). If the power supply voltage is equal to or lower than a certain voltage, it is determined that the vehicle engine is stopped and communication is completed. If not stopped, the process proceeds to step S6.

  In step S3, it is determined whether there is a reception history. If there is a reception history, the process proceeds to step S4, and if there is no reception history, the process proceeds to step S5. For example, there is no history at the time of a new car. The control unit 33 determines whether the recording unit 34 has a reception history.

  In step S4, when there is a reception history, the set value of the safety device obtained by the previous communication with the master station 1 is performed on the safety device 36. The controller 33 sets a safety device set value for each safety device 36. In step S5, an initial value is set. For example, the initial value of the set value of the safety device is registered in the recording unit 34 when the vehicle is shipped.

In step S6, the current setting value of the safety device of the safety device 36 is updated to the latest setting value of the safety device acquired in step S1.
In step S7, it is determined by the sensor / measurement device 35 whether the safety device 36 is in operation (detection level). If the detection level is equal to or higher than a preset determination level, the process proceeds to step S8, and if not, the process proceeds to step S12. Based on the measurement result transmitted from each measurement device of the sensor / measurement device 35, the control unit 33 converts the measurement result indicating the current vehicle state into a preset detection level. Then, the determination is made by comparing the detection level with the safety-related information acquisition determination level for determining whether or not to acquire the safety-related information of the preset sensor / measurement device 35 recorded in the recording unit 34. . For example, if the detection level obtained from the measurement result of the sensor / measurement device 35 is “0” or more when the safety-related information acquisition determination level is “0”, the detection level is larger than the safety-related information acquisition determination level. Therefore, the process proceeds to step S8.

Here, the determination level will be described with reference to FIG.
The diagram shown in FIG. 4 is a diagram showing the determination level of the safety device 36. FIG. 4 shows “pre-crash warning”, “pre-crash brake”, and “pre-crash seat belt”. The determination level of “pre-crash warning” is set to “3”, and the determination levels of “pre-crash brake” and “pre-crash seat belt” are set to “9” or higher. The data detected by the measuring device such as the vehicle speed sensor, acceleration sensor, and millimeter wave radar of the sensor / measuring device 35 has a detection level generated based on the measurement result of the sensor / measuring device 35 with a determination level “0” or higher. (When it is within the acquisition range of safety-related information (safety-related information)). Further, the closer the judgment level is to “0”, the safer, but the safety device 36 starts quickly (hypersensitivity) and is troublesome for the driver. Conversely, the closer the determination level is to “9”, the more comfortable, but the driver is more comfortable because the start of the safety device 36 is slower.

  In step S8, it is determined whether the safety device 36 operates. It is determined whether or not the detection level is equal to or higher than the set value of the safety device provided for the safety device 36 to operate. If it is above, the process proceeds to step S9. The control unit 33 compares the set value and detection level of the safety device corresponding to each safety device 36 recorded in the recording unit 34.

In step S9, the safety device 36 operates. In the example of FIG. 4, the “pre-crash warning” is activated when the detection level is “3” or higher.
In step S10, it is determined whether a certain time has passed in order to determine whether the safety device 36 has completed its operation. If the predetermined time has elapsed, the process proceeds to step S11, and the process proceeds to step S8 for a certain time.

In step S <b> 11, the safety-related information data acquired by the safety device 36 is recorded in the recording unit 34.
In step S12, it is determined whether it is time to transmit safety-related information to the master station 1. When it is time to transmit, the process proceeds to step S13. Otherwise, the process proceeds to step S1. As for the transmission timing, each vehicle transmits safety-related information to the master station 1 every certain time (for example, every hour) or when a certain amount of safety-related information is stored (for example, every ten cases). For example, transmission is performed using a transmission trigger.

  In step S13, it is determined whether there is data for recording the safety-related information acquired in the recording unit 34 when the safety-related information acquisition determination level is “0” or more. If it is recorded, the process proceeds to step S14. If not, the process proceeds to step S1.

In step S14, data including safety-related information is modulated and transmitted to the master station 1 from the transmitting / receiving unit 32.
Describe safety-related information. The safety related information has a data structure as shown in FIG. 5, for example. “Number” to identify the vehicle, “Date and time” to record the date and time, “Environment” to record the temperature and weather, “Vehicle position” to record the data measured by GPS to record the vehicle position, and road conditions “Road condition” for recording the “safety device 36”, “safety device setting value” for recording the setting value of the safety device 36, “detection level” for recording the detection level generated based on the data measured by the sensor / measurement device 35 ”,“ Safety sensor data ”for recording measurement data for each device of the sensor / measurement device 35, and“ safety device operation status ”for recording the operation status of the safety device 36.
(Operation on the master station side)
The operation of the master station 1 as the center will be described.

FIG. 6 is a flowchart showing the operation of the master station 1.
In step S61, safety-related information from each vehicle is received. The transmission / reception unit 22 of the master station 1 receives transmission signals (such as safety-related information) transmitted from each vehicle.

In step S62, the database recorded in the recording unit 24 is searched.
In step S63, it is determined based on the safety-related information whether the transmission source vehicle has been transmitted from a vehicle already registered in the safety-related information database of the recording unit 24 of the master station 1. If already registered, the process proceeds to step S65. If not registered, the process proceeds to step S64. In step S64, the vehicle is registered. The control unit 25 registers the vehicle in the recording unit 24.

  In step S65, the new safety-related information received is added to or updated in the safety-related information database of the corresponding vehicle. The control unit 25 adds or updates the safety related information of the corresponding vehicle to the recording unit 24.

  In step S66, statistical data is calculated based on the safety-related information database. The statistical value of all registered vehicles is obtained for each vehicle. Thereafter, the set value of the safety device is calculated based on the statistical data. For example, for each vehicle, (1) average detection level, (2) average detection level per unit distance (average detection level / travel distance), and (3) classification by time (time, weather, location, road condition) Statistical data such as average detection level is calculated. In addition, for registered vehicles, (4) average detection level value of all vehicles, (5) average detection level of all vehicles per unit distance (detection level average / travel distance), and (6) classification by time (time, weather, Statistical data such as an average detection level for each place and road condition) and (7) an average detection level for an accident vehicle are calculated. The statistical analysis unit 26 performs statistical calculation based on the safety-related information database recorded in the recording unit 24. For example, in the case of classification according to location, the vehicle at the time of traffic congestion at the Tokyo Metropolitan Expressway and when cruising on a general road is extracted from all the accumulated data of a certain period in the past, and the average value of the detection level is obtained. Note that classification based on biological information (driver's heart rate, blood pressure) may be performed. Furthermore, the accuracy is further improved by taking into account personal information (gender, age) and the like. The data is not limited to the average value, and statistical data such as a correlation value may be used. For example, when the correlation value is used, the setting value of the safety device is changed by looking at the correlation value between the safety-related information of the vehicle A and the accident vehicle data.

  In step S67, based on the statistical data or analysis data in step S66, it is determined whether or not the setting value of the corresponding safety device needs to be updated for the transmission source vehicle or all registered vehicles. If updating is necessary, the process proceeds to step S68, and if not necessary, the process proceeds to step S61. The control unit 25 makes a determination based on the processing result of the statistical analysis unit 26. Then, the determination result is recorded in the recording unit 24. For example, it changes according to the driving habit compared with the detection level average. Also, people with a short distance between cars raise the level.

In step S68, the set value of the safety device is transmitted to the transmission source vehicle or all registered vehicles. The set value of the safety device is transmitted from the control unit 25 to the vehicle via the transmission / reception unit 22.
Note that the master station 1 may always grasp the positions of all registered vehicles in real time, and change the set value of the safety device according to the vehicle position and situation. For example, the level is changed depending on a specific place, weather, or traffic jam.

The safety-related information database is a database in which safety-related information transmitted from each vehicle shown in FIG.
The statistical database consists of (1) average detection level, (2) average detection level per unit distance (average detection level / travel distance), and (3) detection by status (time, weather, location, road condition). Level average, (4) average detection level of all vehicles, (5) average of all vehicle detection levels per unit distance (average detection level / mileage), (6) classification by time (time, weather, location, This is a database constructed from data such as the average of detection levels for each (road condition) and (7) average of accident vehicles. FIG. 7 shows an example of classification by location and road status as classification by status.

Details of step S67 will be described.
FIG. 8 is a flowchart showing the operation of changing the set value of the safety device. For example, the case where the average detection level per unit distance (detection level average / travel distance) is used as statistical data will be described.

  In step S81, it is determined whether the average detection level of vehicle A per unit distance is greater than the average detection level of all registered vehicles. If the average detection level per unit distance of the vehicle A> the average detection level per unit distance of all registered vehicles, the process proceeds to step 85. Otherwise, the process proceeds to step S82.

  In step S82, it is determined whether the set value of the safety device and the detection level per unit distance of all registered vehicles are the same. If they are the same, the process proceeds to step SS81, and if they are different, the process proceeds to step S83.

In step S83, the average detection level per unit distance of all registered vehicles is set as the set value of the safety device.
In step S84, the set value of the safety device is transmitted.

  In step S85, it is determined whether the average detection level of vehicle A per unit distance is 60% or more of the average detection level of all registered vehicles. If it is 60% or more, the process proceeds to step S88, and if not, the process proceeds to step S86.

In step S86, “1” is added to the average detection level per unit distance of all registered vehicles.
In step S87, it is determined whether the added detection level is “9” or less. If the level is “9” or lower, the process proceeds to step S87. If the level is higher than “9”, the process proceeds to step S810.

  In step S88, it is determined whether the average detection level of vehicle A per unit distance is 70% or more of the average detection level of all registered vehicles. If it is 70% or more, the process proceeds to step S811, and if not, the process proceeds to step S89.

In step S89, “2” is added to the average detection level per unit distance of all registered vehicles.
In step S810, “9” is set.

  In step S811, it is determined whether the average detection level of vehicle A per unit distance is 80% or more of the average detection level of all registered vehicles. If it is 80% or more, the process proceeds to step S813, and if not, the process proceeds to step S812.

In step S812, “3” is added to the average detection level per unit distance of all registered vehicles.
In step S813, the set value is set to the average detection level per unit distance of all registered vehicles.

  By adjusting the operation of the safety device according to the driving situation by these processes, when a certain vehicle is congested in the Tokyo Metropolitan Expressway, the master station 1 always communicating with the vehicle will And the average value of the above-mentioned detection level at the time of traffic congestion at the Tokyo Metropolitan Expressway is transmitted to the corresponding vehicle. The corresponding vehicle is set to the average value at the time of traffic congestion at the Metropolitan Expressway that has received the operation level of the preventive safety system. The same can be done for ordinary road vehicles.

  The present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the gist of the present invention.

It is a figure which shows the structure of a preventive safety system. A is a diagram when safety-related information is transmitted from the slave station to the master station. B is a diagram when the set value of the safety device is transmitted from the master station to the slave station. It is a figure which shows the structure of the master station and slave station which comprise a preventive safety system. A is a figure which shows the structure of a master station. B is a diagram showing a configuration of a slave station. It is a flowchart which shows operation | movement of a sub_station | mobile_unit. It is a figure which shows the setting of a safety device. It is a figure which shows the data structure of safety relevant information. It is a flowchart which shows operation | movement of a master station. It is a figure which shows the example of the classification by a place and a road condition as classification according to a situation. It is a flowchart which shows the operation | movement of the setting value change of a safety device.

Explanation of symbols

1 Master station,
2 slave stations,
21 Antenna,
22 Transmitter / receiver,
23 arithmetic processing unit,
24 recording section,
25 control unit,
26 statistical analysis department,
31 antenna,
32 Transmitter / receiver,
33 control unit,
34 Recording section,
35 sensors and measuring devices,
36 safety devices,

Claims (9)

A preventive safety system having a slave station mounted on a vehicle and a master station that performs wireless communication with the slave station,
A sensor / measuring device for measuring the situation of the vehicle itself and the surrounding environment of the vehicle mounted for each vehicle, and notifying the driver mounted on the vehicle whether or not it is safe. The slave station connected to a safety device to protect;
Setting of the safety device that receives safety-related information that is a result of measurement by the sensor / measurement device transmitted from the slave station, performs statistical analysis based on the safety-related information, and indicates the start of operation to the safety device The master station for transmitting values in a timely manner,
The slave station is
If the detection level generated based on the measurement result of the sensor / measurement device is the same as or higher than the preset value of the set value of the safety device, the safety related information is recorded in the recording unit and the parent Sending the safety-related information to the station,
Preventive safety system characterized by that. The master station is
When changing the set value level of the safety device of the safety-related information transmission source vehicle, the average of the statistical data of the transmission source vehicle and the average of all the statistical data of all registered vehicles 2. The preventive safety system according to claim 1, wherein comparison is made and a predetermined level is added to an average of detection levels of all the vehicles based on a comparison result to obtain a set value of the safety device.   The statistical data includes an average of detection levels, an average of detection levels per unit distance, an average of detection levels classified by time zone, weather, location, road conditions, etc., an average of detection levels of accident vehicles, and detection for each biological information. The preventive safety system according to claim 2, wherein the preventive safety system is any one of averages of levels.   The preventive safety system according to claim 1, wherein the slave station transmits the safety-related information to the parent station when the safety-related information is stored for a certain time or a certain amount. It is a slave station of the preventive safety system that performs wireless communication with the master station.
The slave station is
A transceiver for performing wireless communication with the master station;
Sensors and measuring devices that measure the situation of the vehicle itself and the surrounding environment of the vehicle mounted for each vehicle, and notify the driver mounted on the vehicle whether it is safe and protect the driver The safety-related information is recorded if the detection level generated based on the measurement result of the sensor / measurement device is equal to or greater than the preset value of the set value of the safety device. A control unit that instructs the master station to transmit the safety-related information when the safety-related information is stored for a certain time or a certain amount;
A recording unit for recording the safety-related information;
A slave station for a preventive safety system. The parent station of the preventive safety system that performs wireless communication with the slave station,
The master station is
A transmitting / receiving unit for performing wireless communication with the slave station;
Setting of the safety device that receives safety-related information that is a result of measurement by the sensor / measurement device transmitted from the slave station, performs statistical analysis based on the safety-related information, and indicates the start of operation to the safety device An arithmetic processing unit for instructing to transmit a value to the slave station in a timely manner;
A recording unit for recording the safety-related information and the statistical analysis result transmitted from each vehicle;
A master station for preventive safety systems. The master station is
When changing the level of the set value of the safety device of the vehicle that is the transmission source of the safety related information, the average of statistical data of the vehicle of the transmission source and the average of all statistical data of all the registered vehicles The preventive safety system according to claim 6, wherein a predetermined level is added to an average of detection levels of all the vehicles based on a comparison result to obtain a set value of the safety device. Master station.   The statistical data includes an average of detection levels, an average of detection levels per unit distance, an average of detection levels classified by time zone, weather, location, road conditions, etc., an average of detection levels of accident vehicles, and detection for each biological information. The master station of the preventive safety system according to claim 7, wherein the master station is any one of averages of levels. A preventive safety method performed by a slave station mounted on a vehicle and a master station that performs wireless communication with the slave station,
A sensor / measuring device for measuring the situation of the vehicle itself and the surrounding environment of the vehicle mounted for each vehicle, and notifying the driver mounted on the vehicle whether or not it is safe. If the detection level generated by the slave station connected to the safety device to be protected based on the measurement result of the sensor / measurement device is equal to or greater than the preset value of the set value of the safety device , Recording the safety-related information in a recording unit, and when the safety-related information is stored for a certain time or a certain amount, the safety-related information is transmitted to the master station,
The master station receives safety-related information that is a result of measurement by the sensor / measurement device transmitted from the slave station,
The master station performs statistical analysis based on the safety-related information, and transmits the set value of the safety device indicating the start of operation to the safety device to the slave station in a timely manner.
A preventive safety method characterized by that.