JP7076085B2 - Overload status determination device - Google Patents

Description

The present invention relates to an overloaded state discriminating device for discriminating an overloaded state of a vehicle.

Overloading is the act of loading a vehicle that exceeds the specified load weight and driving the vehicle, which is an illegal act that damages the road surface, road structure, bridges, etc., and causes traffic pollution due to noise and vibration in the surrounding area. Therefore, improvement is required. Therefore, the weight of the vehicle is measured at a predetermined place such as the entrance of a toll road, but there are problems such as the measurement place is limited and the measurement takes time, which may cause traffic congestion in some cases. Was there.

For the purpose of solving the above problem, for example, a method of calculating the vehicle weight by the following vehicle weight monitoring system that does not directly measure the weight of the vehicle has been proposed. That is, it is a vehicle weight monitoring system including an in-vehicle device provided in the vehicle and a server for exchanging data with the in-vehicle device, and the in-vehicle device measures vibration data of a vehicle traveling on a road surface. The server is equipped with a measuring means for storing vehicle model information including information relating the natural frequency and weight of the vehicle, and the natural vibration of the vehicle based on vibration data (acceleration data, angular velocity data). It is provided with a natural frequency specifying means for specifying a number, and a weight calculating means for calculating the weight of a vehicle based on the specified natural frequency and the vehicle model information (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-102730

In the vehicle weight monitoring system, the natural frequency (natural frequency of the suspension) of bouncing (acceleration in the vertical direction) and pitching (forward / backward rotation) of the vehicle is specified. However, since the natural frequency is in the vicinity of 1.5 Hz, it is difficult to accurately specify the value, and it is difficult to accurately calculate the vehicle weight. In addition, in order to accurately specify the natural frequency, it is necessary to input external data such as the road surface shape, and it is necessary to travel in a section having a predetermined shape, so that there is a problem that the measurement location is limited. Had had.

The present invention has been made to solve each of the above problems, and can easily determine the overloaded state at any place without directly measuring the weight of the vehicle regardless of the measurement place. It is an object of the present invention to provide an overload state determination device capable of enabling the above.

In order to achieve the above object, the present invention relates to an overload state determination device (hereinafter, may be referred to as "this overload state determination device") having a vehicle data measurement unit and an overload state determination unit. The vehicle data measuring unit includes an acceleration measuring means for measuring the acceleration data of the vehicle, and the overloaded state determining unit determines the natural frequency due to the vehicle weight factor in a predetermined frequency band based on the measured acceleration data. A means for specifying a specific natural frequency, a means for storing a specific natural frequency which is the specified natural frequency, and a means for determining an overloaded state for determining whether or not the vehicle is overloaded are provided. The overloaded state determination means has a threshold range in which the specific natural frequency is a value of a predetermined appearance ratio from the minimum value of the predetermined number of the specific natural frequencies stored in the storage means of the specific natural frequency. It is characterized in that it is configured so that it can be determined that it is in an overloaded state when it belongs to the inside.

First, in the present invention, terms such as weight relating to a vehicle are used based on the following definitions.
"Gross vehicle weight" means "gross vehicle weight with a maximum capacity and a maximum load capacity" stipulated in the Road Transport Vehicle Law.
The "vehicle weight" means "a weight in which a load is not loaded and is equipped with a specified total amount of fuel, oil, water, etc. and a standard specification loading platform, etc."
The "actual vehicle weight" is the "weight (calculated value) of the vehicle calculated by the overloaded state determination device".
The "overloaded state" means a state in which the vehicle is loaded with a load equal to or greater than the gross vehicle weight.
In addition, when simply describing "the weight of the vehicle", it means "the weight of the vehicle" as a general and abstract meaning.

Further, in the present specification, according to the convention, the terms "frequency" and "frequency" are used properly depending on the context, but they are used interchangeably.

In the present invention, the target vehicle is not limited, and can be applied to various vehicles such as freight vehicles, passenger vehicles, passenger vehicles, special work vehicles, and heavy construction machinery.
In addition, a predetermined number stored in the storage means of the specific natural frequency (a certain number or more is required to ensure the accuracy of discrimination, but there is no particular provision) in the specific natural frequency. The value of the predetermined appearance ratio from the minimum value can be appropriately set according to the ratio of the actual overloaded vehicle, and can be set as, for example, a 3% value or a 5% value.

The natural vibration of a vehicle correlates with various factors, and it has been clarified that there are multiple types. The present inventor has diligently studied a method for identifying an overloaded state of a vehicle, and as a result, between the natural frequency in a specific frequency region (frequency band) extracted from the acceleration data of the vehicle and the weight of the vehicle. There is a strong correlation, and especially when using acceleration data in the front-rear direction, it is easy to specify the frequency because the frequency is higher than the natural frequency of the suspension used in the prior art for determining the vehicle weight. I came to find it.

Further, according to the research of the present inventor, it has been clarified that the natural frequency decreases as the weight of the vehicle increases. In general, running in an overloaded state is rarely performed constantly in order to damage the vehicle, and the frequency is very low. Therefore, in the present invention, the value of the predetermined appearance ratio (actual excess) is based on the minimum value in the predetermined number of specific natural frequencies stored in the storage means of the specific natural frequency for each individual vehicle for which the calculation is performed. A value determined according to the ratio of loaded vehicles) is used as a threshold value of a specific natural frequency corresponding to the gross vehicle weight to determine whether or not the vehicle is in an overloaded state.

As described above, the present invention accumulates a large amount of specific natural frequency data of a predetermined frequency band specified from the acceleration data in the front-rear direction of the target vehicle for each individual target vehicle, and stores the natural frequency and the vehicle in advance. It is possible to determine whether or not the target vehicle is in the overloaded state by the overloaded state determining means without giving the relational expression of the actual weight. Vehicles that are determined to be overloaded are warned, timely contacted the target organization, and measured using a large scale at the nearest weight measurement point (hereinafter referred to as "actual measurement"). ) Can be used for such things.

Further, in the overload state determination device, the overload state determination unit uses the specific natural frequency to determine the actual vehicle weight based on a predetermined relational expression between the natural frequency and the actual vehicle weight. It is preferable to provide a means for calculating the actual weight of the vehicle, because the actual weight of the vehicle can be calculated easily and with high accuracy without the need for inputting external data such as the road surface shape and without actually measuring the weight. ..

Further, in the overload state determination device, the overload state determination unit has a lower limit reference value which is a value of a predetermined appearance ratio from the minimum value in the specific natural frequency of the predetermined number stored in the storage means. If a correction means for correcting the relational expression between the natural frequency and the actual weight of the vehicle is provided based on the upper limit reference value which is the value of the predetermined appearance ratio from the maximum value in the specific natural frequency of the predetermined number. Since the relational expression of the vehicle actual weight calculation means can be always modified during use, the vehicle actual weight can be calculated with high accuracy.

Further, in the overloaded state discriminating device, the vehicle data measuring unit includes a speed measuring means for measuring the speed data of the vehicle, and the overloaded state discriminating unit includes a discriminating means for the measured speed data. It is preferable that the vehicle actual weight calculation means is configured so that the integrated amount can be calculated only when the measured speed data is at least a predetermined speed.

In the present invention, the natural frequency is specified from the acceleration data, but in order to secure a certain degree of reliability with respect to the acceleration data, it is necessary to travel at a speed equal to or higher than a predetermined speed. According to the present invention, a speed measuring means and a speed data discriminating means are provided, and it is possible to discriminate the overloaded state or calculate the actual vehicle weight only when the measured speed data is at least a predetermined speed. , The actual weight of the vehicle can be calculated efficiently and with high accuracy.

Further, in the overload state determination device, it is preferable that the overload state determination unit is provided with vehicle stop state determination means.

Here, as the vehicle stop state determination means, speed data can be used, or a stop state detection device (for example, a parking brake operating state detection device) or the like can be used.

It is empirically known that when the target vehicle is stopped for a certain period of time, the load is often loaded and unloaded. According to the present invention, it is possible to determine whether the target vehicle is stopped or running for a predetermined fixed time by the vehicle stop state determining means, so that the actual weight of the vehicle is calculated at each time point before and after the stop. It becomes possible to grasp the change in the state.

Further, in the overloaded state determination device, the vehicle data measuring unit includes a means for detecting the position information of the vehicle, and further has a mapping unit, and the mapping unit is the detected position of the vehicle. A map information display means that searches for map information corresponding to the information and displays the searched map information including road information, and a mapping means that displays the position of the vehicle on the searched map information. It is preferable to provide.

Here, as the position information detecting means, a means such as detecting the current position of the vehicle by receiving GPS satellite radio waves can be used.
Further, the map information display means uses the map information stored in the external server and is configured to be displayed on the display means (output means) of the overload state determination device, or the map information is stored. It can be configured to include a device and a map information search device.

Further, the overloaded state determination device may be provided with storage means for storing vehicle position information, vehicle information, measurement time, actual vehicle weight, and the like. Furthermore, the vehicle actual weight indexing means for totaling the vehicle actual weight for each predetermined time zone and performing the desired average value and other indicators, and the vehicle actual weight calculated as the total vehicle weight of the target vehicle. The overloaded state detailed determination means, which determines in more detail that the vehicle is in an overloaded state exceeding the gross vehicle weight, as compared with the above overloaded state determining means, and the overloaded load. An overload starting point detecting means for detecting an overloading starting point, which is a loading location, a specific vehicle extracting means for extracting a vehicle having a predetermined weight or more (for example, an overloaded state), and a loading / unloading amount detecting means at a vehicle stop position. It is also preferable to provide each means such as.

According to the present invention, the overloaded state and the actual vehicle weight of the target vehicle are appropriately combined and mapped by appropriately combining the map information corresponding to the detected position information of the vehicle and the position information specified by the position information detection device. It can be displayed on the map of the map data by means. Therefore, for example, the traveling status of an overloaded vehicle can be displayed on a map to be visually grasped, or the traveling locus of each vehicle can be grasped, and the traveling loci of a plurality of vehicles can be aggregated for each predetermined time zone. However, it is possible to display routes and the like where the actual weight of the vehicle is large and an excessive load is applied to the road.

Among the means constituting the overload state determination device, the vehicle data measurement unit needs to be installed in the target vehicle. However, the overloaded state determination unit and the mapping unit are not limited in their installation locations. Therefore, other constituent means are installed in the target vehicle to accumulate the data, and each means other than the acceleration measuring means, the speed measuring means and the position information detecting means is installed in an external organization such as a management center, and the communication means. The purpose of use and the purpose of transmission, such as transmitting the measured acceleration data and speed data to the necessary means, or transmitting the overloaded state information or the actual weight of the vehicle to an external organization via the communication means, etc. The configuration of the device can be changed as appropriate according to the usage environment and the like.

According to the present invention, it is possible to easily determine the overloaded state without inputting external data such as the road surface shape and without directly measuring the weight of the vehicle. Equipment can be provided.

It is a block diagram which shows the overload state discriminating apparatus of this invention. It is explanatory drawing of the specification method of the specific natural frequency. It is explanatory drawing about the relationship between a specific natural frequency and the actual weight of a vehicle. It is a flow figure which shows the operation of the overload state discriminating apparatus of this invention. It is explanatory drawing which shows an example of the output screen by the mapping part in the overload state determination apparatus of this invention. It is explanatory drawing which shows the other example of the output screen example by the mapping part in the overload state determination apparatus of this invention.

Hereinafter, an embodiment of the overloaded state determination device W will be described in detail with reference to the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

[overall structure]
As shown in FIG. 1, the overloaded state determination device W is installed in the in-vehicle device S loaded on the target vehicle (hereinafter referred to as “target vehicle C”) and the management center. The data analysis device K is connected to the data analysis device K by the communication means T. The entire operation of the overloaded state determination device W is controlled by the system management unit 60, and each device can be operated as desired from the outside by using a known input / output device (not shown). ing.

(1) In-vehicle device The in-vehicle device S constitutes a vehicle data measuring unit 10 and a measurement data transmitting unit 20, and measures the speed measuring means 11 for measuring the speed data of the target vehicle C and the acceleration data in the front-rear direction. The acceleration measuring means 12, the position information detecting means 13, and the parking brake operation detecting means 14 are provided, and are installed at a predetermined position of the target vehicle C.

The speed measuring means 11 and the acceleration measuring means 12 can use known devices, and can measure the speed data of the target vehicle C and the acceleration data in the front-rear direction, respectively.

Further, the position information detecting means 13 receives radio waves from a plurality of GPS satellites at the current position of the target vehicle C, and measures the distance from these satellites from the speed of the radio waves and the propagation time of the radio waves. It is a means for measuring the position, and a known device can be used.

Further, the parking brake operation detecting means 14 can identify the usage state of the parking brake (not shown) and can transmit a parking brake operation signal when the parking brake is used.

Each of the measured data is data by the measurement data transmission unit 20 (measurement data transmission means) and via the communication means T, together with vehicle identification information such as the chassis number and the in-vehicle device number, and predetermined data such as the measurement date and time. It is configured to be transmitted to the measurement data receiving unit 50 (measurement data receiving means) in the analysis device K (hereinafter, the transmitted data may be referred to as "transmission vehicle data").
The communication means T is also not limited, and a general communication line (wired or wireless) can be used, or a dedicated communication device installed on the shoulder of a toll road or the like can be used.

(2) Data analysis device The data analysis device K includes an overload state determination unit 30, a mapping unit 40, a measurement data reception unit 50, and a system management unit 60. The measurement data receiving unit 50 is configured to appropriately output each received data to each means.

[Overload status determination unit]
The overloaded state discriminating unit 30 includes a data storage means 31, a vehicle stop state discriminating means 32, a speed data discriminating means 33, a natural frequency specifying means 34, an overloaded state discriminating means 35, and a vehicle actual weight calculating means. 36, a calculation formula correction means 37, and a specific natural frequency updating means 38 for calculation are provided.

(Data storage means)
The data storage means 31 further includes a measurement data storage means 31a, a vehicle basic information storage means 31b, a specific specific frequency storage means 31c, and a vehicle actual weight storage means 31d. The data stored in each storage means can be input / output, modified, read, and the like as appropriate by the data input / output means (not shown).

The measurement data storage means 31a is transmitted from the measurement data transmission unit 20 of the vehicle-mounted device S, and the transmission vehicle data received by the measurement data reception unit 50 is associated and stored.

The vehicle basic information storage means 31b includes a chassis number, an in-vehicle device number, a manufacturing company name, a vehicle owner company name, a driver name, a vehicle type (truck, bus) and a weight type (small, medium, large) (hereinafter, "type". ”), Gross vehicle weight, vehicle weight, number of passengers, and other predetermined data are associated and stored.

In the specific natural frequency storage means 31c, the specific natural frequency (including the lower 5% specific natural vibration value and the upper 5% specific natural vibration value below) specified by the natural frequency specifying means 34 described later is at least vehicle identification. It is stored in association with the information and the measurement date and time.

The vehicle actual weight storage means 31d stores at least the vehicle actual weight calculated by the vehicle actual weight calculation means 36 in association with the vehicle identification information and the measurement date and time.

(Vehicle stop state determination means)
The vehicle stop state determining means 32 is a means for detecting the operating state of the parking brake and determining whether or not the target vehicle C is in the stopped state. The vehicle stop state determining means 32 is configured to be able to determine that the parking brake is operating and the target vehicle C is stopped when the parking brake operation signal is received.

(Speed data discrimination means)
The speed data discriminating means 33 determines whether or not the measured speed data (hereinafter referred to as “measured speed value”) is equal to or higher than a predetermined reference running speed (20 km / h in this embodiment). It is a means to do. When the measured speed value output from the measurement data receiving unit 50 is equal to or higher than the reference running speed, the speed data discriminating means 33 performs each process after specifying the natural frequency, and is lower than the reference running speed. Is configured not to perform the processing.

(Means for specifying natural frequency)
The natural frequency specifying means 34 uses the measured acceleration data (hereinafter referred to as “measured acceleration value”) to determine the natural frequency of the target vehicle C belonging to the reference frequency band predetermined for each predetermined type. It is a means to identify.

There are various factors that generate the natural frequency, and the reference frequency band to which the natural frequency belongs due to the weight of the vehicle differs for each predetermined type, but can be specified in advance by an experiment. The present inventor has diligently studied a method for calculating the actual weight of the vehicle, and as a result, the natural frequency (particularly preferably within the range of 4 Hz to 10 Hz) extracted from the acceleration data (preferably the acceleration data in the front-rear direction of the vehicle). However, it is not limited to this value), and it has been clarified that there is a strong correlation with the weight of the vehicle.

In order to specify a specific frequency from the measured acceleration value output from the measurement data receiving unit 50, a predetermined analysis time is set, the frequency generated by a special factor is excluded, and the frequency with the maximum amplitude is extracted. It is necessary to perform the processing to be performed. In this process, for example, frequency analysis such as high-speed Fourier transform (FFT) is performed, and the frequency is set to a predetermined reference amplitude (power spectrum) or more and a predetermined frequency band (between the upper limit and the lower limit of the specific natural frequency). It is possible to specify the frequency to which the amplitude (power spectrum) belongs is the maximum (Fig. 2).

The calculated specific natural frequency is stored in the specific natural frequency storage means 31c in association with the vehicle identification information and the measurement date and time, and is output to the overload state determination means 35 and the vehicle actual weight calculation means 36. It has become.

(Means for determining overloaded state)
In the overload state determining means 35, the specific natural frequency at the time of measurement has an appearance rate of 5% based on the minimum value in the predetermined number of specific natural frequencies stored in the specific natural frequency data storage means 31c. Natural frequency of value (5% value) (value of appearance frequency of 5% in total number of measurements for each individual target vehicle (hereinafter referred to as "total number of measurements")) (hereinafter, "lower 5% specific specific" It is a means for determining that the vehicle is in an overloaded state and outputting the result when the value is less than or equal to "vibration value".

According to the research of the present inventor, it has been clarified that the natural frequency decreases as the weight of the vehicle increases. Therefore, in the present embodiment, it is assumed that the number of measurements in the overloaded state in each vehicle is 5% of the total number of measurements, and the lower 5% specific natural vibration value is set to the specific natural frequency corresponding to the gross vehicle weight. It is decided to use it as a threshold value to determine whether or not the vehicle is in an overloaded state (FIG. 3).

In the following description, the natural frequency of the ratio of 5% (5% value) is referred to as the maximum value in the predetermined number of specific natural frequencies stored in the specific natural frequency storage means 31c. , "Top 5% specific natural vibration value" (value of appearance frequency of 5% in the total number of measurements for each individual target vehicle C) (upper limit reference value).
Further, the lower 5% specific natural vibration value is used as the "lower limit reference value" in the claims.

(Vehicle actual weight calculation means)
The vehicle actual weight calculation means 36 uses the specific natural frequency specified by the natural frequency specifying means 34 based on a predetermined relational expression between the natural frequency and the actual vehicle weight, and the vehicle of the target vehicle C. It is a means for calculating the actual weight, and specifically, it is configured so that the actual vehicle weight of the target vehicle C can be specified from the following actual vehicle weight calculation formula (1) (hereinafter referred to as "calculation formula"). Has been done.

W (i, t) = α (i, t) × {f (i, t) -FH (i, t)} + W (i) (1)
W (i, t): Actual vehicle weight (calculated value) of the target vehicle i at the time of measurement t
α (i, t): Conversion coefficient at the time of measurement t of the target vehicle i (formula (2) below)
W (i): Vehicle weight of target vehicle i (given)
f (i, t): Specific natural frequency at the time of measurement of the target vehicle i FH (i, t): Top 5% specific natural vibration value up to the time of measurement of the target vehicle i

Here, α (i, t) is a conversion coefficient and is corrected by the calculation formula correction issuing means 37. Further, as W (i), the vehicle weight for each target vehicle i stored in the vehicle basic information storage means 31b is used, and at the start of operation (measurement time t = 0), the FH (i, 0) is set. , A given initial value is set.

The specific natural frequency and the actual vehicle weight are configured to be stored in the vehicle actual weight storage means 31d in association with the vehicle identification information and the measurement date and time.

In this embodiment, the calculation formula (1) is a linear formula, but a higher-order formula can also be used to improve the accuracy.

(Calculation formula correction means)
The calculation formula correction means 37 uses the above calculation formula (1) based on the latest upper 5% specific natural vibration value and lower 5% specific natural vibration value updated by the calculation specific natural frequency updating means 38. It is a means to correct.

α (i, t) = {Wmax (i) -W (i)} / {FL (i, t) -FH (i, t)} (2)
α (i, t): Conversion coefficient Wmax (i) at the time of measurement of the target vehicle i: Gross vehicle weight of the target vehicle type i (given)
W (i): Vehicle weight of target vehicle i (given)
FL (i, t): Lower 5% specific natural vibration value up to t when the target vehicle i is measured FH (i, t): Upper 5% specific natural vibration value up to t when the target vehicle i is measured

As described above, as the weight of the vehicle increases, the natural frequency decreases and the amplitude increases. On the other hand, traveling in an overloaded state damages the vehicle and violates laws and regulations. Therefore, in general, traveling in an overloaded state is rarely performed constantly.

Considering such a situation, the overloaded state determination device W is operated, a certain time elapses, and a specific value of the specific natural frequency is accumulated, so that the specific natural vibration corresponding to the gross vehicle weight is accumulated. The value will be close to the minimum value of the specific natural frequency. On the other hand, the specific natural vibration value corresponding to the weight close to the vehicle weight (to be exact, the value including the driver weight, but this value is not considered as an error) is the maximum value of the specific natural frequency. Will be.

The calculation formula (1) is a value obtained by subtracting the vehicle weight from the gross vehicle weight according to the value of (specific natural frequency at the time of measurement of each target vehicle-5% specific natural vibration value of each target vehicle). The actual vehicle weight is calculated by proportionally distributing (gross weight-vehicle weight).
Therefore, in the conversion coefficient correction formula (2), the top 5 of the specific natural frequency is set as the upper limit reference value which is the value of the predetermined appearance ratio from the maximum value in the specific natural frequency stored in the specific natural frequency storage means 31c. % Specific natural vibration value (value determined in consideration of measurement error, etc.) is used, and the lower 5% specific natural vibration value is used as the lower limit reference value, which is the value of the predetermined appearance ratio from the maximum value in the specific natural frequency. Therefore, the conversion factor is corrected.

Further, as the upper 5% specific natural vibration value and the lower 5% specific natural vibration value used in the vehicle actual weight calculation means 36 and the calculation formula correction output means 37, the output value of the specific natural frequency updating means 38 for calculation described later is used. ..

(Specific natural frequency update means for calculation)
The specific natural frequency updating means 38 for calculation has the vehicle actual weight calculation means 36 and the correction of the calculation formula described later with respect to the specific natural frequency of the target predetermined number stored in the specific natural frequency data storage means 31c. It is a means for updating the upper 5% specific natural vibration value and the lower 5% specific natural vibration value used in the means 37. The updated upper 5% specific natural vibration value and lower 5% specific natural vibration value are stored in the specific natural frequency data storage means 31c and output to the vehicle actual weight calculation means 36 and the calculation formula correction output means 37 described later. It is supposed to be done.

[Mapping section]
The mapping unit 40 includes a map information display means 41 that displays map information including road information, a map information search means 42 that searches for map information corresponding to vehicle position information, a mapping data creation means 43, and an overloaded state determination. It includes a mapping means 44 for displaying the data determined and calculated by the unit 30 on the searched map, and a display condition selection means 45.

The map information search means 42 can connect to a map database (not shown) stored in an external server via the communication means T, searches for map information corresponding to the position information of the vehicle, and displays the map information. 41 is configured so that a map of a desired point can be displayed on a display means such as a display.

The mapping data creating means 43 is for mapping for displaying the presence / absence of the overloaded state determined by the overloaded state determining means 35 and the actual vehicle weight calculated by the vehicle actual weight calculating means 36 on the map information. It is a means to create the data of. For example, mapping that integrates necessary data such as vehicle identification information and measurement information for the position information specified by the position information detecting means 13 and the target vehicle C in the overloaded state determined by the overloaded status determining means 35. You can create data.

With respect to the mapping data created by the mapping data creating means 43, the mapping means 44 of the target vehicle C according to various conditions such as by vehicle, vehicle type, measurement time, and load weight by the display condition selection means 45. It is a means for making a selection and displaying according to desired conditions. For example, with respect to the target vehicle C in the overloaded state, the traveling route in a predetermined time zone can be displayed on a map by the mapping means 44 and grasped.

[Operation of this overload status determination device]
Subsequently, the operation of the overload state determination device W will be described (FIG. 4).
For convenience of explanation, when the overloaded state determination device W is used, it is assumed that the target vehicle C is equipped with the in-vehicle device S.
Further, since the overloaded state discriminating device W is guaranteed to have a certain degree of accuracy in calculation after a predetermined time has elapsed and a predetermined number of specific natural frequencies have been accumulated for each target vehicle C. It is assumed that a predetermined time has passed and the state is in a steady state.

First, the speed measuring means 11, the acceleration measuring means 12, and the position information detecting means 13 of the in-vehicle device S measure and detect the speed data, the acceleration data, and the position information of the target vehicle C (S1), and the transmitting vehicle data is measured. It is transmitted by the data transmission unit 20 to the measurement data reception unit 50 of the data analysis device K.

The measurement data receiving unit 50 that has received the transmission vehicle data stores the transmission vehicle data in each means of the data storage means 31, and also transmits the measurement speed value data to the speed data determination means 33.

The speed data determination means 33 determines whether or not the measured speed value is equal to or higher than a predetermined reference running speed, and if the measured speed value is equal to or higher than the reference running speed, the actual vehicle weight after the specific natural frequency is specified. If the speed is less than the standard traveling speed, the actual weight of the vehicle is not calculated (S2).

When the measured speed value is equal to or higher than the reference traveling speed, the natural frequency specifying means 34 performs frequency analysis, specifies the specific natural frequency (S3), stores it in the specific natural frequency storage means 31c, and specifies it. The natural frequency is output to the overloaded state determination means 35 and the vehicle actual weight calculation means 36.

The overload state determining means 35 determines whether or not the specific natural frequency is equal to or less than the lower 5% specific natural vibration value, and if the specific natural frequency is equal to or less than the lower 5% specific natural vibration value, the target is When the vehicle C is in the overloaded state and the specific natural frequency is larger than the lower 5% specific natural vibration value, it is output to the output means that the vehicle C is in the normal loaded state (S4).

Further, the vehicle actual weight calculation means 36 calculates the weight of the target vehicle C based on the calculation formula (1) using the specific natural frequency (S5), stores it in the vehicle actual weight storage means 31d, and stores it in the mapping unit. 40 and output to a predetermined display means / output means such as a display or a printing means.

The conversion coefficient used in the above calculation formula (1) is a specific natural vibration for calculation based on the upper 5% specific natural vibration value and the lower 5% specific natural vibration value stored in the specific natural frequency storage means 31c. The number updating means 38 and the calculation formula correction issuing means 37 are constantly corrected (updated) via the conversion coefficient correction formula (2) (S6), and the actual vehicle weight is calculated using the latest correction parameters. Will be.

The actual vehicle weight can be displayed on the map corresponding to the detected position information by the mapping unit 40 under desired conditions (S7).

For example, with respect to a specific target vehicle C, the traveling position is specified in real time, and the traveling state (driving, exceeding the regulated speed, stopped, parking, etc.) and the actual vehicle weight for each speed are displayed on the specified road map. And the loading status can be displayed, and predetermined vehicle identification information and the like (for example, in-vehicle device number, vehicle owner company, driver name, etc.) can be displayed (FIG. 5).

Further, the traveling route of the overloaded vehicle detected by the overloaded state determining means 35 is displayed on the road map together with data such as the traveling date and time and the traveling state according to the traveling speed (FIG. 6), and predetermined. By performing the data processing of the above, it is possible to display the number of overloaded vehicles by dividing them into predetermined rungs for each road link.

[Operation and effect of this overload status determination device]
According to the overload state determination device W, a large amount of data of a specific natural frequency in a predetermined frequency band specified from the acceleration data in the front-rear direction of the target vehicle C is collected, and the determination is performed using the overload state determination means 35. By performing the process, it is possible to easily determine whether or not the target vehicle C is in the overloaded state.

Further, the vehicle actual weight calculation means 36 is based on the specific natural frequency of the predetermined frequency band specified from the acceleration data in the front-rear direction of the target vehicle C and the relational expression between the predetermined natural frequency and the actual vehicle weight. By using, the actual weight of the vehicle can be calculated easily and with high accuracy without the need for inputting external data such as the road surface shape and without actual measurement.

Further, the calculation formula correction issuing means 37 updates the upper 5% specific natural vibration value and the lower 5% specific natural vibration value based on a large number of collected specific natural frequencies by the calculation specific natural frequency updating means 38. Since the calculation formula (1) of the vehicle actual weight calculation means 36 can be modified by using the above, the vehicle actual weight can be calculated with high accuracy.

Further, according to the overloaded state discriminating device W, the speed measuring means 11 and the speed data discriminating means 33 are provided, and the overloaded state discriminating means 35 is the actual vehicle weight only when the measured speed data is at least a predetermined speed. Since it is possible to calculate the actual weight of the vehicle, it is possible to calculate the actual weight of the vehicle efficiently and with high accuracy.

Further, since the vehicle stop state determining means 32 can determine whether the target vehicle is stopped or running for a predetermined fixed time, the actual weight of the vehicle is calculated at each time point before and after the stop. , It becomes possible to grasp the change of the state.

Further, the position information specified by the position information detecting means 13 and the actual weight of the vehicle can be displayed on the map of the map data by the mapping unit 40. For example, the position information specified by the position information detecting means 13 and the target vehicle of the overloaded state determined by the overloaded state determining means 35 can be displayed on the map by the mapping means 44 and grasped. ..

Although an example of a preferred embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and the design can be appropriately changed without departing from the spirit of the present invention.

For example, the configuration of each means can be realized by using various software that can realize the same function. In addition, the content, type, communication method, etc. of the data to be transmitted and received can be appropriately determined.

In addition, in the overload state determination device, all means are installed in the target vehicle and the data is stored in the storage means, and only the data of the actual weight of the vehicle is transmitted to the external organization via the communication means. , The configuration of the device may be changed as appropriate according to the purpose of use, the environment of use, and the like.

Further, in the above embodiment, the vehicle stop state determining means is configured to detect the operating state of the parking brake. However, if a state of a predetermined stop reference speed (for example, 1 km / h) or less continues for a predetermined time (for example, 10 minutes), the vehicle may be determined to be in a stopped state.

Further, the values from the minimum value to the predetermined appearance ratio in the predetermined number of specific natural frequencies stored in the specific natural frequency storage means and the values from the maximum value to the predetermined appearance ratio are the values of the actual overloaded vehicle. It can be appropriately determined in order to determine the overloaded state and ensure the accuracy of the calculation of the actual vehicle weight in consideration of the running state and the calculation error. For example, it can be a 1% value, a 3% value, a 5% value, or a 10% value, and the ratio from the minimum value and the ratio from the maximum value may be different.

Further, in the present embodiment, the overloaded state is determined and the actual vehicle weight is calculated by using the data of each individual vehicle, but it is also possible to collect the data of each vehicle type and other types. can.

In addition, based on the vehicle identification information, the target vehicle identified as being overloaded is warned via communication means to the desired related parties such as the target vehicle, the business establishment of the target vehicle, and the road management organization. It is also possible to provide a warning information transmission means for transmitting information.

Further, the map information display means may be configured to independently include a storage device for storing map information and a map information search device in the overloaded state determination device.

Further, by using the discriminant information of the discriminated overloaded state and the actual weight and position information of the vehicle, it becomes possible to make useful use by various methods. For example, grasping the traveling locus of each vehicle, totaling the traveling loci of multiple vehicles at predetermined time zones, etc., and displaying the route where the actual weight of the vehicle is large and the road is overloaded, etc., the target vehicle. It can be used to display the weight rank of the loaded weight (for example, no load, proper weight state, overloaded state, etc.) and the traveling route on the road map.

W Overload state determination device C Target vehicle S In-vehicle device K Data analysis device 10 Vehicle data measurement unit 11 Speed measurement means 12 Acceleration measurement means 13 Position information detection means 14 Parking brake operation detection means 30 Overload state determination unit 31 Data storage means 31c Specific natural frequency storage means 31d Vehicle actual weight storage means 32 Vehicle stop state determination means 33 Speed data determination means 34 Specific frequency identification means 35 Overloaded state determination means 36 Vehicle actual weight calculation means 37 Calculation formula correction output means 40 Mapping Part 44 Mapping means 45 Display condition selection means

Claims (6)

In an overload state determination device having a vehicle data measurement unit and an overload state determination unit,
The vehicle data measuring unit includes an acceleration measuring means for measuring the acceleration data of the vehicle.
The overloaded state determination unit is
Based on the measured acceleration data, the natural frequency specifying means for specifying the natural frequency due to the vehicle weight factor in a predetermined frequency band, and the natural frequency specifying means.
The storage means of the specific natural frequency, which is the specified natural frequency, and
A means for determining an overloaded state for determining whether or not the vehicle is overloaded is provided.
The overloaded state determination means has the specific natural frequency.
When it belongs to the range of the threshold value which is the value of the predetermined appearance ratio from the minimum value of the specified natural frequency stored in the storage means of the specific natural frequency, it is determined that the overloaded state is present. An overloaded state determination device characterized by being configured in such a manner. The overloaded state determination unit is
Claim 1 is provided with a vehicle actual weight calculation means for calculating the actual vehicle weight using the specific natural frequency based on a predetermined relational expression between the natural frequency and the actual vehicle weight. The overloaded state determination device described in 1. The overloaded state determination unit is
A predetermined appearance ratio from the lower limit reference value which is the value of the predetermined appearance ratio from the minimum value in the specific natural frequency of the predetermined number stored in the storage means and the maximum value in the specific natural frequency of the predetermined number. Based on the upper limit reference value, which is the value of
The overloaded state discriminating device according to claim 1 or 2, wherein the correction means for correcting the relational expression between the natural frequency and the actual weight of the vehicle is provided. The vehicle data measuring unit includes a speed measuring means for measuring the speed data of the vehicle, and also has a speed measuring unit.
The overloaded state discriminating unit includes means for discriminating the measured speed data.
The second aspect of the present invention is characterized in that the vehicle actual weight calculation means is configured to be able to determine the overloaded state only when the measured speed data is at least a predetermined speed. Overload status determination device. The overload state determination device according to any one of claims 1 to 4, wherein the overload state determination unit includes a vehicle stop state determination means. The vehicle data measuring unit includes means for detecting the position information of the vehicle, and also has a vehicle data measuring unit.
In addition, it has a mapping unit
The mapping unit searches for map information corresponding to the detected position information of the vehicle, and displays the searched map information including road information, and a map information display means.
The overloaded state determination device according to any one of claims 1 to 5, further comprising a mapping means for displaying the position of the vehicle on the searched map information.

Images