JPH0734409A - Heating control method for road surface heating device - Google Patents

Abstract

PURPOSE:To save energy for preheating power by using outdoor brightness as data for setting heating conditions when heating road surface using various data to make show melting, icing prevention, etc. CONSTITUTION:In addition to conventional detections of paved body temperature, road surface moisture, ambient temperature, presence or absence of snow removal, etc., the outdoor brightness is detected using a pyrheliometer 1, etc. Next a controller main body 10 turns on and off a switching element 11 based on these detected values to turn on and off a power supplied from a power 12 to a road surface heating heater 13. Then, because snow fall probability is low when it is fine and bright even if ambient temperature is low, the paved body temperature in preheating operation in daylight is set lower. For hot water type heating system, also hot water supply is turned on and off controllably in the same manner. Thus, even if preheating temperature is lowered remarkably, snow melting capacity at the initial period of snow fall can be maintained, and also energy for preheating can be saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road surface heating device for heating the road surface on the basis of data such as the temperature of pavement on the road, the water content of the road, the outside air temperature and the presence or absence of snowfall to prevent the snow from melting or freezing on the road surface. The present invention relates to a method for automatically controlling heating conditions.

[0002]

2. Description of the Related Art There are various conventional methods for automatically controlling the heating conditions (heating temperature, preheating set temperature, preheating time start time, end time, etc.) of a road surface heating device. As a main one, there was a method of detecting the outside air temperature, road surface moisture (snow can be also detected as moisture by melting with a heater built into the sensor), and made a determination based on these three types of detection data. Among them, as a general method, there are many methods of merging and using the data of and, and a method of using only the data of. As another simple method, the temperature of the pavement can be directly adjusted to a temperature suitable for snow melting (for example, 10 to 10 on the heater surface).
There is also a system in which the temperature is controlled at 15 ° C and about 1 to 3 ° C on the road surface.

[0003]

Since the heat capacity of the road pavement is very large, normally, even if the snow melting heater is energized after the snow starts, the snow melting effect cannot be obtained in the early stage of the snowfall. Therefore, conventionally, during non-snowfall or non-snowfall, preheating energization is performed to pre-energize the snow melting heater to preheat the road pavement in preparation for sudden snowfall or freezing. In a measurement example, in the control method using only the above data, 45% of the total operating time is heating for preheating, 20% is heating during snow melting, and 35% is OFF. Moreover, the preheating temperature is set higher as the outside air temperature is lower (automatically set by the control device), so that power consumption by preheating (heating when snow is not falling) increases. For this reason, the large amount of heat consumed during preheating has become a major problem.

An object of the present invention is to use the outdoor brightness as the heating temperature setting data to shorten the preheating time in the road surface heating device so that the road surface can be preheated efficiently and snow melting or freezing can be prevented. Is to

[0005]

The inventor of the present invention has conducted extensive studies to shorten the preheating time and effectively prevent snow melting or freezing, and as a result, it is fine and bright even if the outside temperature is low. The present invention has been completed, paying attention to the fact that it is possible to set the preheating temperature to a low level because snow does not start (almost never) within a short time.

A heating control method for a road surface heating apparatus according to the present invention is
Preheating the road surface based on data such as pavement temperature, road surface moisture, outside air temperature, presence or absence of snowfall, road surface snow melting,
In a heating control method for a road surface heating device for preventing freezing, outdoor brightness is also used as data for setting heating conditions.

[0007]

In the heating control method for the road surface heating device according to the present invention, since the outdoor brightness is also used as the heating data, the pavement temperature during the daytime preheating operation is when the weather is sunny (when the outdoor weather is
Normally, the probability of snowfall is low, and the time it takes for snow to start is long).

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating control method for a road surface heating device according to the present invention is a method for detecting the temperature of a pavement body, road surface moisture, outside air temperature, the presence or absence of snowfall, etc., which is conventionally used when the temperature of the road surface heating device is controlled. In addition, the outdoor brightness is also detected, and the heating condition of the road surface heating device is set based on the detected data.

To detect the brightness of the outdoors, for example, a pyranometer is used, and the judgment point of the pyranometer is 400 to 600 kca.
It is set to 1 / m ² h (about 0.45 to 0.7 kw / m ² ), and when there is an amount of solar radiation exceeding this value, it is judged to be sunny.

In the present embodiment, the pyranometer or illuminance meter detects the brightness of a relatively wide range of the sky, and the preheat temperature determined by the separately detected outside air temperature value is lowered according to this data. Or, if the detected data exceeds a certain brightness, it is judged as clear and the normal preheat set temperature is lowered, or conversely, if it is below a certain brightness, it is judged as cloudy and the normal preheat set temperature is kept. To do.

Usually, the preheating temperature of the road surface heating device is usually set higher when the outside air temperature is low, and set lower when the outside air temperature is high, and the value is about 5 to 8 ° C. Until now, a considerable amount of preheating power was consumed to preheat to a positive temperature of -5 ° C when the outside air temperature is low. In this example, when it was determined that the weather was fine, the maximum set temperature of 5 ° C. was set lower than the normal preheat set temperature. The decrease width was set as follows. Road surface moisture Yes: Small decrease width No: Large decrease width Time on built-in clock Morning, Evening: Small decrease daytime: Large decrease

FIG. 1 shows an example of a road surface heating apparatus which employs the heating control method for the road surface heating apparatus of the present invention. In FIG. 1, 1 is a pyranometer for detecting outdoor brightness, 2 is a snowfall detector for detecting snowfall on a road surface, 3 is an outside air temperature sensor, 4 is a road surface moisture sensor, 5 is a pavement temperature sensor, and 6 is a pyranometer. Solar radiation amount / electrical converter that converts the solar radiation amount detected in 1 into an electric signal,
Reference numeral 7 is an outside air temperature / electrical converter that converts the outside air temperature detected by the outside air temperature sensor 3 into an electric signal, and 8 is a moisture / electricity converter that converts the moisture detected by the road surface moisture sensor 4 into an electric signal,
Reference numeral 9 is a pavement body temperature / electricity converter for converting the pavement body temperature detected by the pavement body temperature sensor 5 into an electric signal, and 10 is a controller body. This controller body 10 turns on / off the switching element 11 based on signals from the solar radiation / electrical converter 6, the outside air temperature / electrical converter 7, the moisture / electrical converter 8, and the pavement body temperature / electrical converter 9. The electric power supplied from the power source 12 to the heater 13 for heating the road surface is controlled to be turned on and off. The controller body 10 preferably has a built-in clock function.

Although the above-mentioned embodiment is the case of the electric heating system, the present invention is such that the switching element 11 is turned ON and OF in the hot water heating system as in the case of the electric heating system.
By performing F control, preheating can be controlled by stopping or restarting hot water flow to a road surface heating pipe (corresponding to the road surface heating heater 13) not shown.

Further, in the present invention, even if an illuminometer is used instead of the pyranometer, the same effect can be obtained.

[0015]

The heating control method of the road surface heating device of the present invention has the following effects. ． Even if the outdoor brightness is detected as "fine" and the preheating temperature is significantly lowered, it is possible to secure the snow melting ability in the early stage of snowfall, and it is possible to realize energy saving of preheating power. ． Since the preheat set temperature becomes low and the output of the temperature controller is turned off at a high rate during the daytime when the outside air temperature is high or when the weather is sunny, the substantial energization rate is reduced and the waste of preheating power is reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a road surface heating device adopting a heating control method for a road surface heating device of the present invention.

Claims (1)

[Claims] 1. A method for controlling the heating of a road surface heating device, which heats the road surface based on data such as pavement temperature, road surface moisture, outside air temperature, and the presence or absence of snowfall to prevent snow melting and freezing on the road surface. A heating control method for a road surface heating device, characterized in that the temperature is also used as data for setting heating conditions.