JP2001081711A - Operation method and device of road heating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive energy saving by performing preheating operation by variable value control modifying to set temperature capable of increasing temperature up to temperature capable of preventing snow accumulation by snow melting operation after this time even when snow falls before a snow fall start time predicting the set temperature. SOLUTION: The newly set temperature p (Δt) of the preheating operation at a time point (t1+Δt1) on and after the time point t1 in which snow fall is judged after the time t0 is found from the temperature subtracting a temperature difference ΔH (t) capable of increasing the temperature in a remaining time t from snow fall prevention temperature Hb. In the case where the follow-up of the control of the preheating operation is good, the set temperature P (Δt) is substituted for the heater temperature Hn since the set temperature P (Δt) and heater temperature Hn are substantially equal to each other, and when the set temperature P (Δt) is found, P (Δt)=Hm-(Hm-Hb) exp(t/T) is obtained, wherein Hm is an equivalent temperature during temperature increase in the maximum efficiency, T is a temperature increase time constant during temperature increase in the maximum efficiency and exp is an exponential function. The heater temperature is controlled to a desired snow accumulation prevention temperature Hb without any obstruction until the snow fall start time of forecast even when snow falls, and before this time, since the preheating operation is performed by the minimum preheating temperature in which a heater capacity is allowed in accordance with weather forecast information, large energy saving can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method and a driving device for road heating for preventing snow melting and freezing on a road, and more particularly, to a road surface having an appropriate temperature which does not cause a problem even if snow falls before snow falling. The present invention relates to a road heating operation method and an operation device for performing a preheating operation for preheating the preheating.

[0002]

2. Description of the Related Art In recent years, road heating in cold regions has been practiced to prevent snow melting and freezing. This road heating is usually carried out by burying a heating wire at a predetermined depth from the road surface and energizing the heating wire to heat the road surface. Therefore, an efficient driving method is demanded.

On the other hand, Japanese Patent Laid-Open Publication No. Hei.
Japanese Patent Publication No. 118007 proposes a road heating device that controls a road surface temperature using a snowfall probability forecast. This road heating apparatus includes means for inputting a snowfall probability forecast for each time zone by a weather station, means for calculating a snowfall prediction in proportion to time based on the snowfall probability forecast, and a preheating operation based on the snowfall prediction. Means for controlling the road surface temperature by selecting the preheating target temperature, and a certain effect can be obtained in terms of energy saving.

[0004]

However, in the above-mentioned prior art, the weather forecast used is three hours to six hours from the weather station.
Since it is a snowfall probability forecast for each time period of each prefecture (however, Hokkaido is divided into 14 branches), it calculates the snowfall probability proportionally distributed for each time to avoid a sudden change between time zones,
A set temperature corresponding to each snowfall probability is determined in advance, and operation is performed at a set temperature corresponding to the snowfall probability at that time. Therefore, when the snowfall probability suddenly increases, there is a serious problem that even if the temperature is increased by the entire capacity of the heater, the temperature cannot be sufficiently increased until the snowfall, and the snowfall cannot be prevented.

[0005] To solve this problem, the present inventors previously determined the snowfall start time using the section information to which the target road surface belongs in the patent application of Japanese Patent Application No. 10-109253, and obtained it from a specific formula. We proposed an operation method that follows the weather forecast change by setting the preheating set temperature to a temperature that can raise the snow prevention temperature, which is the preheating target temperature immediately before snowfall, by the time of the snowfall.

The temperature that can be raised is a product K × of a road surface preheating target temperature H immediately before snowfall, a road surface heating rate K, and a time T from a set time to a snowfall prediction time of weather forecast information. The temperature P minus T is P = (H−K × T). However, in the subsequent study, as can be seen from the fact that the heating rate K is set as a constant in this method, since the influence of heat transfer such as heat radiation and heat absorption due to the difference from the outside air temperature is not taken into account, short-term prediction Although the results were almost approximated and were satisfactory, when calculating the preheating set temperature based on long-term prediction, there was a large error from the actual heating capacity,
It turned out that there was a problem that the temperature could not be raised.

The present invention has been made in view of such circumstances, and relates to an improvement of the above-mentioned method, and relates to an improvement of the above-mentioned method. It is intended for a method and a driving device.

[0008]

The above object is achieved by the present invention described below. That is, the present invention provides a road heating operation method of performing a preheating operation of preheating a road surface before snowfall at a set temperature according to weather forecast information and performing a snowmelting operation of melting snow during snowfall. If the temperature rises from the time when the heater has full capacity, even if there is snowfall before the snowfall start time predicted from the weather forecast information, the temperature is changed to the set temperature that can raise the temperature to the snowfall prevention temperature where snowfall can be prevented if snow melting operation is performed thereafter. This is a road heating operation method characterized by performing preheating operation by additional value control.

In the method of the present invention, a method of approximating the temperature rise characteristic of the road surface by a first-order lag system and changing the set temperature based on the approximation, in particular, a method of changing the set temperature P by the following equation, simplifies the processing. It is preferable from the viewpoint of speeding up.

P = Hm− (Hm−Hb) exp (t / T) (1) where, Hm: equilibrium temperature at the time of temperature increase at the maximum capacity Hb: snowfall prevention temperature T: temperature increase at the maximum capacity Heating time constant during warming t: Time from setting time to predicted snowfall time of weather forecast information exp: Logarithmic function

[0011] As an apparatus for performing this, preheating operation means for preheating the road surface before snowfall at a set temperature according to weather forecast information, and snow melting operation means for heating the road surface to a set temperature at which snowfall melts during snowfall. A road heating operation device including the preheating operation device and the snow melting operation device, a local control device installed at the site of the road surface, and a wide-area weather forecast including the input weather forecast information of a plurality of regions. Central control means for extracting weather forecast information of an area including the road surface from the information and transmitting the information to the on-site control means. Even if there is snowfall by the snowfall start time predicted from the weather forecast information, additional value control means that controls while changing to a temperature that can raise the temperature to the snowfall prevention temperature that can prevent snowfall if snowmelt driving is performed after that It preferably road heating operation and wherein the composed.

In the above-mentioned present invention, the weather forecast information is updated periodically, in other words, at a predetermined cycle, and the set temperature is updated every time the weather forecast information is updated. The configuration in which the preheating operation is performed by the follow-up value control that follows the change in the above is particularly preferable in view of the follow-up ability to the long-term weather forecast. Hereinafter, details of the present invention will be described based on examples.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the system configuration of the apparatus of the embodiment, FIG. 2 is a flowchart of the operation method of the embodiment, FIG. 3 is a flowchart of the preheating operation means, and FIG. It is a graph explaining.

In FIG. 1, reference numeral 1 denotes a computer for a central system of central control means for centrally managing a road heating control panel 5 of local control means installed on a road in each area where road heating is laid. . The computer 1 for the center system is connected to a weather information providing system 2 provided by the Japan Meteorological Association and the like via a modem 4 for weather information reception by a communication line 3 and a wide area weather forecast including weather forecast information of a plurality of related areas. Receives information regularly.

The road heating control panel 5 and the computer 1 for the center system communicate with each other via the communication line 3 by the modem 6 for communication between local control panels on the center system side and the modem 7 for communication between center systems on the local control panel side. The center system computer 1 can set the load heating controller 8 in the local load heating control panel 5 installed at each location and can monitor the state.
As described above, the basic configuration is the same as that of the above-described related art.

In this example, the center system computer 1 receives two types of wide area weather forecast information from the weather information providing system 2. One of them is weather forecast information for a predetermined time at a plurality of continuous fixed time intervals for each area divided by a grid at a predetermined interval received every hour, more specifically, one hour ahead in this example. , Weather forecast information of each block at three consecutive one-hour intervals two hours ahead and three hours ahead (hereinafter,
"Mesh forecast").

The other one is a wide-area weather forecast information which is a long-term forecast information for each prefecture received three times a day. Specifically, in this example, the announcement at 5:00 is from 6 to 12 o'clock, 12 to 18 o'clock, 18 ~
24 o'clock, 0-6 o'clock, 11 o'clock, 12-18 o'clock, 1
8-24 o'clock, 0-6 o'clock, 6-12 o'clock, 17:00 o'clock, 18-24 o'clock, 0-6 o'clock, 6-12 o'clock, 12-18 o'clock,
Snowfall probability information in each time zone from 18:00 to 24:00 (hereinafter,
"Prefectural forecast"). In the present embodiment, from a practical point of view, of the above-mentioned prefectural forecasts, a forecast up to 18 hours ahead is adopted in the system. Specifically, at 5 o'clock, 6-12 o'clock, 12-18 o'clock, 18-24 o'clock, 11 o'clock
At the time announcement, 12-18 o'clock, 18-24 o'clock, 0-6 o'clock,
In the presentation at 17:00, snowfall probability information in each time zone from 18:00 to 24:00, 0 to 6 o'clock, and 6 to 12 o'clock is adopted.

The center system computer 1 extracts the weather forecast information of each area to which each road on which the road heating is laid belongs from the received wide area weather forecast information of the target area including each target area as follows. To the road heating control panel 5 in each area.

The mesh forecast received in this example is weather forecast information edited for sections divided by a grid with a grid interval of 5 km, and there is no rain / snow, strong rain, weak rain, Strong wet snow, weak wet snow, strong dry snow,
The weather information is expressed in eight different states: weak dry snow and missing data. This mesh forecast is useful for judging the weather forecast of each area on the safe side as described later.

The prefectural forecast of the other wide-area weather forecast information is weather forecast information in an area divided into prefecture units (however, Hokkaido is divided into 14 branches) as described above. 0: rain probability, 1: rain or snow probability, 2: snow or rain probability, 3: snow probability classification information and its probability information are expressed as percentages as snowfall probability information in each time zone. Things. Here, the classification information is determined by the outside air temperature zone. For example, in a certain area, the probability of rain is determined when the outside air temperature is + 2 ° C. or higher, and when the temperature is between 0 ° C. and + 2 ° C., the rain or snow is generated. Probability, -2 ° C to 0
If the temperature is between 0 ° C. and 0 ° C., the probability is snow or rain, and if it is lower than −2 ° C., the probability is snow.

Then, the computer 1 for the center system checks the mesh prediction of each area to which the target area belongs and the mesh prediction of eight sections adjacent to this area as the mesh prediction of each area. : No rain and snow,
1: strong rain, 2: light rain, 3: strong wet snow, 4: weak wet snow, 5: strong dry snow, 6: weak dry snow, 7: missing, numbered and meshed with these 9 sections The maximum value in the forecast is determined as the mesh forecast for the area.

For the prefectural forecast, the classification information of the area to which the target area belongs and the snowfall probability are checked, and the time zone including the current time and two subsequent time zones, that is, the time of (current time + 6 hours) Are determined as the prefectural forecast of the region. The three pieces of information of the time zone including the time zone and the time zone including the time of (current time + 12 hours) are determined. The computer 1 for the center system transmits the determination results of the mesh forecast and the prefectural forecast to the road heating control panel 5 in the area each time the forecast information is received, specifically, every hour.

On the other hand, the road heating controller 8 of the local control means is configured as follows. That is,
It is connected to a road surface temperature sensor, a heater temperature sensor, a snowfall sensor, and a moisture sensor (not shown), and includes a snow melting operation unit, an anti-freezing operation unit, and a preheating operation unit that are operated by these detection signals as shown in FIG.

When the snowfall sensor detects snowfall, the snowmelt driving means turns on and off the heater by a well-known on / off control with a target temperature set at a high temperature suitable for melting snowfall as a snowmelt operation mode. The road surface temperature is controlled to the set temperature. The anti-freezing operation means sets the anti-freezing operation mode when the moisture on the road surface is detected by the moisture sensor without snowfall, and performs the same on / off control with the target temperature set at the minimum temperature required for the anti-freezing to reduce the road surface temperature. Control is performed to this set temperature.

The preheating operation means is set to the preheating operation mode as described below when there is no snowfall or moisture, and performs the following power saving operation by the same on / off control. In addition,
The flow of FIG. 2 is a known digital control, and is executed at a predetermined clock cycle as is well known. For example, in this method, control is performed at a cycle of one minute.

Next, the preheating operation method will be described. Conventionally, the road heating controller 8 uses the preheating operation means to prepare for a sudden snowfall even when there is no snowfall and no water on the road surface. A preheating operation is performed in which the heater temperature is controlled with a constant snow prevention temperature that does not cause any problem as a target value. From the viewpoint of energy saving, it is preferable to shorten the preheating operation time at this high temperature for preventing snow accumulation and to perform the preheating operation at the lowest possible temperature.

The present invention realizes this point as follows. Hereinafter, an operation method together with the preheating operation will be described for an embodiment in which the snow prevention temperature is set to Hb ° C. and long-term weather forecast information several hours or more ahead is used.

Here, with respect to the road surface of the road to be controlled,
In advance, a condition of a low outside air temperature close to the actual condition in winter, for example,-
At about 5 ° C., the temperature rise characteristics of the road surface or the surface of the heater are measured. From the viewpoint of preventing snow accumulation, the temperature rise characteristic of the road surface temperature is directly, but in this example, there is a constant good correlation with the road surface temperature, the response is good, and the temperature rise characteristic of the heater surface temperature used in the control system is improved. It was measured.

In this measurement, the characteristics from the initial state in which all the heaters are turned off and the temperature is raised to the maximum capacity under the above state until the state becomes almost steady are measured. In this example, the maximum heater capacity was maintained for at least 3 hours until a steady state was reached. Specifically, all heaters were forcibly continuously energized, and the temperature rise characteristics were measured.
As a result, it was found that the temperature rise characteristics, that is, the heater temperature H (t) at the time t from the start of the temperature rise can be well approximated by the first-order lag system obtained from the one-dimensional heat conduction equation, specifically, the following equation (2). . H (t) = Ho + (Hm−Ho) {1-exp (−t / T)} (2) In the above equation, Ho: initial temperature in the initial state of heater-off, Hm: after heating of the heater Steady state equilibrium temperature T: time constant of temperature rise

The time constant T is approximately determined from the initial temperature Ho and the equilibrium temperature Hm as follows. That is, from the measured data obtained by dividing the temperature rise characteristics obtained by the measurement into appropriate time intervals, the temperature increased in one hour is ΔH
, The temperature gradient dH at the start of the temperature rise becomes the following equation (3) from the differentiation of the equation (2), and this is approximately ΔH. dH (0) = (Hm−Ho) / T ≒ △ H (3)

Accordingly, the time constant T can be approximately obtained from the following equation (4) obtained by modifying this equation. That is, the temperature can be approximately obtained only by measuring the temperature rise ΔH in one hour, the initial temperature Ho, and the equilibrium temperature Hm without measuring the time-dependent change in the temperature rise characteristics during the temperature rise. This greatly simplifies the processing program. T ≒ (Hm−Ho) / △ H (4)

In the present embodiment, the set temperature of the preheating operation is obtained based on the weather forecast information as follows by using the equation of the temperature rise characteristic obtained as described above, and the set temperature is sequentially updated and added. Energy saving is achieved by controlling the value. The following is for the case where it is determined that there is snow than the weather forecast information received at a certain time t ₁ after the time t _0.

[0033] the time that has elapsed from the time t ₁ △ t (t ₁ +
The set temperature P (Δt) at Δt) is obtained as follows. That is, assuming that the heater temperature Hn of the preheating operation at the time point (t ₁ + Δt) is the temperature at which the temperature can be raised during the remaining time t (= t ₀ −Δt) from this time point to the predicted snowfall time (t ₁ + t ₀ ). H (t) is obtained by using the initial temperature Ho as the heater temperature Hn at this point in the equation (2) of the temperature rise characteristic, and is given by the following equation (5). H (t) = Hn + (Hm-Hn) {1-exp (-t / T)} (5)

Accordingly, the temperature difference ΔH (t) at which the temperature can be raised during the remaining time t is the difference between the initial temperature Hn and the temperature H (t) at which the temperature can be raised obtained by the above equation. Given. ΔH (t) = H (t) −Hn = (Hm−Hn) {1-exp (−t / T)} (6)

At time (t ₁ + Δt), time t
Since it is determined later that there is snowfall, the heater temperature H needs to be the snowfall prevention temperature Hb after time t in order to prevent snowfall. Accordingly, the new set temperature P (Δt) of the preheating operation at a certain time (t ₁ + Δt) after the time t _{1 when} it is determined that snow falls after the time t ₀ is calculated from the snow prevention temperature Hb to the remaining time t.
Is the temperature obtained by subtracting the temperature difference ΔH (t) at which the temperature can be raised, that is, the temperature obtained by the following equation (7). P (△ t) = Hb− △ H (t) = Hb− (Hm−Hn) {1-exp (−t / T)} (7)

In the equation (7), when the control of the preheating operation is controlled with good followability, the set temperature P (△ t) is substantially equal to the heater temperature Hn. When the set temperature P (△ t) is obtained by substituting t), the following equation is obtained. The time point of Δt is the predicted snowfall time (t ₁
+ T ₀ ), which is a time before the time t, and therefore, the expression (8) is the same as the expression (1). In this example, the set temperature was changed using this equation. P (△ t) = Hm− (Hm−Hb) exp (t / T) (8)

In the equation (8), when there is no snowfall for a long period of time, it corresponds to the case where the time t is very large, and the maximum temperature Hm of the heater naturally becomes the snowfall prevention temperature Hb.
Since it is higher, the set temperature may be lower than the initial temperature Ho, in which case all heaters are operated off. In addition, at the predicted snowfall time (t ₁ + t ₀ ), the time t becomes zero. Therefore, from the above equation (1), the set temperature Pn (△ t) is Hb
That is, if the target snow prevention temperature is reached and there is no change in the weather forecast information, the operation is performed at this set temperature. Therefore, in this example, when it is determined that there is no snowfall even in the long-term prediction as described later, the time t is set to 18 hours because the maximum value of the adopted prediction time zone is 18 hours. The value is between 12 and 18 hours. The temperature is set by performing the above setting calculation based on the time t. In this example, as described above, the set temperature P is set using the equation (8) obtained from the equilibrium temperature Hm, the snow prevention temperature Hb, and the time t to the predicted snowfall time, which are simple and fast to process. However, the equation (7) may be used by detecting the heater temperature Hn. The latter is preferred in terms of accuracy.

The operation of the road heating including the preheating operation based on this setting method is performed as follows. First, as shown in FIG. 2, the presence / absence of snowfall is determined by a snowfall sensor, and if the snowfall sensor is yes with snowfall, the snowmelt driving means is activated and the snowmelt driving is performed. If the snowfall sensor is no, the presence or absence of moisture on the road surface is determined by the moisture sensor. If the moisture sensor is yes with moisture, the antifreeze driving means is activated and the antifreeze operation is performed.

When the moisture sensor is no, the preheating operation means is started, and the preheating operation of the flowchart shown in FIG. 3 is performed. First, a short-term prediction step is entered, and it is checked whether or not the hourly mesh forecast is received from the computer 1 for the center system. In the case of reception, the following short-term prediction is performed. Enter the judgment of the prediction result and follow the short-term prediction up to that point.

The short-term prediction is based on the mesh forecast received and stored. If the mesh forecast is in the range of 0 to 2, there is no snowfall. If the mesh forecast is in the range of 3 to 7, it is determined that there is snowfall. Check the mesh forecasts for the hour ahead, two hours ahead, and three hours ahead, for example, one hour ahead: no snowfall, two hours ahead: there is snowfall, three hours ahead: in the case of the mesh forecast that there is snowfall, there is snowfall two hours ahead Is determined. In this way, short-term prediction for determining the presence or absence of snowfall in the present example, which is short-term, up to three hours ahead by mesh prediction is performed first, and the result of snowfall and the predicted snowfall time are stored, and then the determination is made. If the result of this determination is that there is snowfall, the process proceeds to a preheating temperature setting step described below, and if the result is no, the process proceeds to the following long-term prediction step.

In the step of long-term prediction, first, it is checked whether or not a prefectural forecast is received. At the time of reception, the following long-term prediction is performed. Follow the predictions. The long-term prediction is performed by examining the received prefectural forecast and setting a predetermined snowfall probability (60% in this example) as a threshold, the start time of the nearest future time zone among the time zones exceeding the threshold, for example, ( The time zone including the time of (current time + 12 hours) is a time zone of 6 to 12 o'clock. If this time zone is the nearest future time zone where the snowfall probability exceeds the threshold, the start time of 6 o'clock is set. The time is determined to be the snowfall time, and how many hours after 6:00 of the snowfall time is after the current time is calculated. Here, when the time from the current time to the snowfall time calculated by the long-term prediction is less than 4 hours, short-term prediction by mesh information that there is no snowfall for 3 hours ahead is given priority from the accuracy and reliability of the information. ,
It is determined that there is snowfall four hours later. The presence or absence of snowfall and the predicted snowfall time as a result of the long-term prediction are stored, and then the determination is made.

[0042] and, if the result in this determination is there snowfall, enter the step of preheating temperature settings, as described below, in the case of a no, as 12 to 18 hours is the time t until the snowfall prediction time t ₀ prediction longest time Calculate and set the temperature setting.

On the other hand, if it is determined that there is snowfall in the short-term prediction or the long-term prediction, the process proceeds to the following preheating temperature setting step to set a preheating set temperature. That is, first, the set temperature P at the time t until the snowfall prediction time t ₀ at the present time (t ₁ + Δt) is obtained by the equation (8), the setting is changed according to the calculated temperature P, and the preheating operation is performed. As described above, the preheating operation is operated by the additional value control in which the set temperature is changed in the above-described control cycle and controlled so as to follow the set temperature.

As described above, according to the present invention, the heater temperature, that is, the road surface temperature is always controlled to a desired snow prevention temperature Hb which does not cause an obstacle even if snow falls by the time of starting the snowfall in the forecast. And before that, since the preheating operation can be performed at the minimum preheating temperature allowed by the heater capacity while following the weather forecast information, a large energy saving effect can be achieved.

Next, an actual operation result according to the present embodiment is shown in FIG.
This will be described with reference to the graph of the time chart. The figure is an example of the following weather conditions. In other words, the weather forecast information changes at a time t ₁ [h] where there is an operation state determined to be no snowfall in the long-term prediction, and a time ts [h] (ts> t + t) when it is determined that there is snowfall ahead of t ₀ hours. _This is an example in which snowfall is actually detected by the snowfall sensor of the road heating control panel 5 in FIG.

The solid line in FIG. 4 represents the set temperature P of the heater surface, and the dotted line represents the actual heater temperature H. Hs
[° C.] is a set temperature when snow melting operation is performed by the snow melting operation means when the road heating controller 8 detects snowfall. Until the time t ₁ is determined in there snowfall, predicted maximum are operated at 12 to 18 hours is the time at a heating possible temperature setting, the heater temperature is the initial temperature P (t _max). Here, t _max is the predicted maximum time.

The determination is made based on the weather forecast information at time t.
After the time t ₁ when the snow falls after _0, from the time when the set temperature P reaches the heater initial temperature Ho to the time (t ₁ + t ₀ ) at which the snow is predicted in each control cycle, the above equation (5) is used. Is operated at the set temperature P determined by Therefore, the set temperature P rises along the curve of the first-order lag system as shown in FIG.
Follows a little later. Predicted snowfall time (t ₁ +
Since the set temperature P becomes the snow prevention temperature Hb at t ₀ ), the preheating operation is continued at the snow prevention temperature Hb unless the weather forecast information is changed until snowfall is detected. Then, when the snowfall is detected, at the time point ts, the snow melting operation means is activated, and thereafter, the snow melting operation is continued. In this way, at the time (t ₁ + t ₀ ) at which the snowfall was predicted, the desired snow prevention temperature Hb [° C.] could be reached, so that sufficient preparation could be made for the snowfall occurring at the subsequent time ts.

Since the operation is performed in this manner, the preheating operation is performed in the case where there is no snowfall even in the long-term prediction, specifically, all the heaters are turned off until the set temperature P reaches the initial temperature Ho in FIG. Becomes Also, from time t to snowfall predicted time (t ₁ + t _0), gradually at a minimum temperature which can be increased by the heater capacity snow preventing temperature until該降snow predicted time as shown the set temperature P (t ₁ + t ₀₎ By increasing the temperature, in other words, reducing the preheating set temperature within the maximum allowable range of the heater capacity and performing the preheating operation, the heater energization time corresponding to the temperature difference in the hatched portion in the figure is shortened. Power saving operation has been achieved. This effect is particularly remarkable when there is snowfall in the long-term prediction.

By the way, in the above-mentioned embodiment, each control means of the on / off control is provided as the driving means from the aspect that the configuration is simple and can be easily realized by simple software, and the selection means switches based on the weather forecast information. However, other known means, such as a controller for continuous control, in which the set value is updated with weather forecast information, can be applied to the driving means.

Although the mesh forecast and the prefectural forecast are used as the weather forecast information, the weather forecast information of the present invention is not particularly limited as long as it can predict the snowfall time in the area.
For example, only mesh forecast, prefecture information, etc.
It is clear from the gist. Furthermore, although the temperature control of the preheating operation is performed at a heater surface temperature having a good responsiveness, a good correlation with the road surface temperature, and a stable detection accuracy, the present invention is not limited to this. It is also clear from the gist of the present invention that the road surface temperature may be detected and controlled directly by the road surface temperature.

[0051]

As described above, the present invention uses the weather forecast information at the snowfall forecast time and changes the setting at the lowest possible set temperature within the range that can be covered by the heater capacity. Preheating operation is performed at a temperature that always follows the temperature, so that snow accumulation is prevented unless it is a sudden heavy snowfall. In addition, when it is predicted that there will be snowfall, the set temperature of the heater can be set to a low value, which shortens the energization time of the heater and realizes a power saving operation, which is a great effect as a power saving operation in road heating operation. Is played.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a system configuration according to an embodiment;

FIG. 2 is a flowchart of an operation method according to the embodiment.

FIG. 3 is a flowchart of a preheating operation unit according to the embodiment.

FIG. 4 is a graph illustrating an operation result according to the embodiment.

[Explanation of symbols]

 Reference Signs List 1 Computer for center system 2 Weather information providing system 3 Communication line 4 Modem for receiving weather information 5 Load heating control panel 6 Modem for communication between local control panels on center system side 7 Modem for communication between center systems on local control panel side 8 Road heat Controller

Continuation of the front page (72) Inventor Jun Hatakeyama 1-6-7 Minamihonmachi, Chuo-ku, Osaka-shi, Osaka Teijin Limited (72) Inventor Yoshitaka Fujioka 2-1-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Teijin F term in reference (reference) 2D051 AA08 GA01 GB08 3L070 DE09 DF15 3L072 AB10 AE10

Claims (18)

[Claims] 1. A road heating operation method in which a preheating operation for preheating a road surface before snowfall at a set temperature according to weather forecast information and a snowmelting operation for melting snow during snowfall are performed. When the temperature rises at the full capacity of the heater, even if there is snowfall by the snowfall start time predicted from the weather forecast information, the temperature is changed to a set temperature at which the temperature can be raised to a snowfall prevention temperature at which snowfall can be prevented by snow melting operation thereafter. A road heating operation method characterized by performing preheating operation by value control. 2. The temperature rise characteristic of a road surface is approximated by a first-order lag system,
The road heating operation method according to claim 1, wherein the set temperature is changed based on the temperature. 3. The set temperature P is changed by the following equation.
The driving method of the road heating described. P = Hm- (Hm-Hb) exp (t / T) where, Hm: equilibrium temperature at the time of heating at the maximum capacity Hb: snowfall prevention temperature T: temperature rising time constant at the time of heating at the maximum capacity t: setting Time from the time point to the predicted snowfall time of weather forecast information exp: logarithmic function 4. The road heating driving method according to claim 1, wherein the weather forecast information is updated at a predetermined cycle. 5. The weather forecast information is converted to a binary value indicating whether or not there is snowfall.
The road heating operation method according to any one of claims 1 to 4, wherein the operation is performed by converting the value into a value. 6. The state information for displaying the weather forecast in a plurality of predetermined states, such as the presence or absence of rain and snow, for each section obtained by dividing the area to be predicted by a grid with a predetermined grid interval. 2. Snowfall probability information including a prediction target area.
6. The driving method for road heating according to any one of claims 5 to 5. 7. The road heating driving method according to claim 6, wherein said weather forecast information comprises weather forecast information for a plurality of continuous time intervals or time zones. 8. When determining a snowfall start time from a plurality of continuous weather forecast information for each of a plurality of continuous fixed time zones, the presence or absence of snowfall is determined in order from the weather forecast information to which the target road surface of the closest time zone belongs. 8. The driving method of road heating according to claim 7, wherein a start time of a time zone determined to have snowfall is determined as a snowfall start time. 9. When determining the presence or absence of snowfall from the weather forecast information, first determine whether or not snowfall exists based on the state information of each section, and then, if there is no snowfall in the determination, based on the snowfall probability information. The road heating driving method according to any one of claims 5 to 8, wherein the determination is made by the following method. 10. When determining the presence or absence of snowfall on a target road surface based on the state information of each area, the state information of a section to which the target road surface belongs and the state information of neighboring sections adjacent thereto in the same time zone are determined. Based on the above, if there is state information that can be determined to have snowfall in any of these sections, the prediction information of the target road surface is determined to be snowfall, and if there is no state information that can be determined to have snowfall in any section, the road surface is determined. The road heating driving method according to any one of claims 5 to 9, wherein it is determined that there is no snowfall. 11. When judging the presence or absence of snowfall on the target road surface from the snowfall probability information, the snowfall probability of the area to which the target road surface belongs is compared with a preset threshold value. Claims 5 to 10 which are determined to be none
The driving method of any of the above-mentioned road heating. 12. The method according to claim 1, wherein the control temperature of the preheating operation is a heater surface temperature. 13. A road heating operation comprising a preheating operation means for preheating a road surface before snowfall at a set temperature according to weather forecast information, and a snowmelt operation means for heating the road surface to a set temperature for melting snowfall during snowfall. In the device, a local control means installed at the site of the road surface provided with the preheating operation means and the snow melting operation means, and an area including the road surface from the wide area weather forecast information including the weather forecast information of a plurality of inputted areas. A central control means for extracting the weather forecast information and transmitting it to the local control means, wherein the preheating operation means increases the set temperature from the current time by the full capacity of the heater, and the snowfall predicted from the weather forecast information. A road heating device characterized by additional value control means for controlling while changing to a temperature at which the temperature can be raised to a snow-prevention temperature at which snow can be prevented if snow melting operation is performed after the snowfall by the start time. Driving equipment. 14. The road heating operating device according to claim 13, wherein the temperature rising characteristic of the road surface is approximated by a first-order lag system, and the set temperature is changed based on the approximation. 15. The driving apparatus for road heating according to claim 14, wherein the set temperature P is changed by the following equation. P = Hm- (Hm-Hb) exp (t / T) where, Hm: equilibrium temperature at the time of heating at the maximum capacity Hb: snowfall prevention temperature T: temperature rising time constant at the time of heating at the maximum capacity t: setting Time from the time point to the predicted snowfall time of weather forecast information exp: logarithmic function 16. A snowfall judging means for judging presence or absence of snowfall and a snowfall start time from said weather forecast information of said area received from said central control means by said preheating operation means.
16. The driving device for road heating according to any one of claims 15 to 15. 17. The on-site control means includes an anti-freezing operation means for heating the road surface to a temperature for preventing the road surface from being frozen, wherein the snow melting operation means is provided when snowfall is detected by the snowfall sensor; The anti-freezing operation means is activated when moisture is detected by the moisture sensor, and the preheating operation means is activated when neither snowfall nor moisture is detected.
7. The road heating operation device according to any one of items 6 to 6. 18. The road heating apparatus according to claim 14, wherein the central control means periodically receives the weather forecast information via a communication line and transmits the weather information of each area to each local control means via the communication line. Driving equipment.