JPH09189007A - Operation control system for snow-melting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation control system by which a vibration condition (hunting) in which the changeover of preheat operation/snow-melting operation is unstable, can be prevented. SOLUTION: An operation control system for snow-melting equipment is provided with a road-surface moisture detector 1, a road-surface temperature setting means 2 for setting the road-surface setting temperature by the output of the road-surface moisture detector 1, and a road-surface temperature control means 3 for controlling the setting temperature of the road-surface temperature. The road-surface temperature setting means 2 sets the snow- melting temperature for T1 in the condition that the road-surface moisture is a specified condition A1 on a wetter side that a reference road-surface moisture A0 or further in a wetter condition, and it sets the preheat temperature for T2 in the condition that the road- surface moisture is a prescribed condition A2 on a dryer side than a reference road-surface moisture A0 or further in a dryer condition; and between the condition A1 and the condition A2, the equipment is provided with a road-surface moisture judging part 2a by which the snow-melting temperature is set for T1 when the road-surface moisture changed from the condition A1 to A2, while the preheat temperature is set for T2 when it changed from the condition A2 to A1; and with an off-delay timer 2b for maintaining the set temperature for a prescribed time after changeover, after the setting temperature has been changed over.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for controlling the operation of snow melting equipment such as road surfaces and sidewalks.

[0002]

2. Description of the Related Art Conventional road surface snow melting equipment detects road surface temperature, road surface moisture, the presence or absence of snowfall, etc., and uses the detected data to set operating conditions such as snow melting operation, preheating operation, etc. The temperature of the heat source of the equipment was controlled. The operation of the snow melting facility is roughly classified into a snow melting operation and a preheating operation. The snow-melting operation is an operation to melt the snow on the road surface, and the pre-heating operation is an operation to heat the road surface in advance so that the snow-melting effect can be immediately exhibited even after the heat source is turned on even if the road surface has a large heat capacity. Therefore, the set temperature of the snow melting operation is higher than the set temperature of the preheating operation. The decision to switch between the snow melting operation and the preheating operation is based on data such as road surface temperature, outside air temperature, road surface water content, and snowfall information, but in order to save energy and perform appropriate operation, road surface water data is especially important. Is. That is, the moisture condition of the road surface is detected by a moisture detector, and when the moisture content is less than the set moisture condition, it is determined that the road surface is dry and preheating operation is performed.
Conversely, if there is more water than the set water condition,
It is determined that there is snow on the road surface and snow-melting operation is performed.

[0003]

However, as described above, when the operating conditions are switched by changing the set temperature of the road surface with the set value of the road surface moisture as the boundary, there are the following problems. That is, immediately after switching to the preheat operation at a predetermined road surface moisture setting value, when the water content of the melted snow passes through the water content detector, the water content detector detects the water content exceeding the road surface moisture setting value, and the operation mode is changed. Return to snow melting operation before switching. Also,
The detected value of the water content on the road surface by the water content detector also fluctuates due to disturbances such as wind, and switching between preheating operation / snow melting operation becomes unstable and results in an oscillatory state (hunting state).

The present invention has been made to solve the above problems.
A road surface moisture detector for detecting road surface moisture,
A path for setting the set temperature of the road surface by the output of the surface moisture detector
Surface temperature setting means and a road surface for controlling the road temperature to a set temperature
For operation control system of snow melting equipment with temperature control means
The road surface temperature setting means sets the set temperature to the reference road surface.
Water condition A₀Predetermined road surface moisture condition A on the wetter side₁You
And above that, the snow melting temperature T₁Set in
And the standard road surface moisture condition A₀Predetermined on the dry side
Road surface water condition A_TwoOr less wet surface moisture
Preheating temperature T _Two(T_Two<T₁) And state A₁When
State A_TwoBetween, the road surface water condition is state A₁Since this time
If the snowmelt temperature T changes₁Set to state
A_TwoFrom the preheating temperature T_Two
And the road surface temperature setting means.
After switching the set temperature, after switching for a predetermined time
It is also characterized by having the function of holding the set temperature of
It is.

If the road surface temperature setting means is provided with the function of setting the road surface temperature according to the road surface moisture condition as described above, the output of the road surface moisture detector may fluctuate due to disturbance such as the influence of wind or passage of melted snow. Also, in the wet condition between the wet condition of the road surface A ₁ and A ₂ on both sides of the standard wet condition of the road surface A ₀ ,
The set temperature becomes constant. Therefore, the road surface water condition A ₁ and A
_In the wet state between the _two , even if the detected value of the road surface moisture fluctuates, the operation mode does not switch, and stable operation of the snow melting equipment can be performed. Further, if the road surface temperature setting means is provided with a function of holding the set temperature after switching for a predetermined time after switching the set temperature, the operation mode does not switch at least within the predetermined time, and stable snow melting equipment is provided. Can drive. As described above, according to the present invention, it is possible to eliminate the phenomenon in which the switching between the preheating operation and the snow melting operation becomes an unstable vibrational state (hunting).

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of an embodiment of an operation control system for snow melting equipment according to the present invention. As shown in FIG. 1, the present system includes a road surface moisture detector 1 for detecting road surface moisture and the road surface moisture detector 1 described above.
The road surface temperature setting means 2 for setting the set temperature of the road surface by the output of the above, and the road surface temperature control means 3 for controlling the road surface temperature to the temperature set by the road surface temperature setting means 2.

The road surface moisture detector 1 uses, for example, an epoxy resin that converts a moisture change into a resistance change as a sensor,
It is installed so that the sensor is exposed on the road surface.
The resistance value of this sensor changes by one digit or more when it is dry and when it is wet.

Further, the road surface temperature setting means 2 is used to determine the road surface water content.
Fixed part 2a, off-delay timer 2b and road surface temperature
It comprises a degree indicating section 2c. The road surface moisture determination unit 2a is previously
Standard road surface water condition A₀, The corresponding standard road surface moisture condition
State A₀Predetermined road surface moisture condition A on the wetter side₁And the criteria
Road surface water condition A ₀Predetermined road surface moisture condition A on the dry side
_TwoEnter and. Then, the road surface water condition A is the road surface.
Water condition A₁If it is on the wet side, melt the road surface temperature
Snow temperature T ₁Off delay timer 2b
Through the road surface temperature setting section 2c. Also, road surface water
Minute state A is road surface moisture state A_TwoIf it is on the dry side of
Preheat temperature T_Two(T_Two<T₁)
Road delay temperature indicator via off-delay timer 2b
Send to 2c. Off-delay timer 2b is a sequence
A timer used for control, which is turned on after the signal passes.
Block the passage of the next signal for a given time t
Have a function. Therefore, in this embodiment, the road surface moisture determination unit
2a gives an instruction signal to switch the road surface temperature setting.
Signal to the road surface temperature setting section 2c,
The race timer 2b keeps track of the next road surface temperature setting for a predetermined time t.
An instruction signal for changing the degree is given to the road surface temperature setting portion 2c.
I can't get it. Also, the road surface temperature setting unit 2c is
Instruction to switch the road surface set temperature from the surface moisture determination unit 2a
The road surface temperature set based on the signal is
Instruct the means 3.

Further, the road surface temperature control means 3 comprises a road surface temperature sensor 3a and a road surface temperature control output unit 3b, and controls the road surface temperature to the road surface set temperature instructed by the road surface set temperature instruction unit 2c.

The operation control system of the snow melting facility operates as follows. That is, 1) When the road surface moisture detector 1 detects the water content in the road surface moisture state which is wetter than the road surface moisture state A ₁ , the road surface moisture determination unit 2a
From the above, an instruction signal for setting the road surface set temperature to the snow melting temperature T ₁ is transmitted through the off-delay timer 2b to the road surface set temperature instruction unit 2
c. The road surface temperature setting output unit 3b inputs the road surface temperature setting of the snow melting temperature T ₁ from the road surface temperature setting instruction unit 2c, and the road surface temperature control output unit 3b controls the road surface temperature to this temperature T ₁ . The off-delay timer 2b does not pass the instruction signal for switching the road surface setting temperature for a predetermined time t after the instruction signal for changing the road surface setting temperature to the snow melting temperature T ₁ is issued, so the road surface setting temperature is held at T _1. . Next, when the water content on the road surface is reduced from A ₁ to the reference water content on the road surface A ₀ , and when it is A ₂ , an instruction to set the set temperature to the preheating temperature T ₂ (T ₂ <T ₁ ). A signal is output from the road surface moisture determination unit 2a to the road surface temperature setting instruction unit 2c through the off-delay timer 2b. From the road setting temperature indicator portion 2c road set temperature of the preheating temperature T ₂ is inputted to the road surface temperature control output section 3b, the track temperature control output unit 3b controls the surface temperature to the temperature T _2. Therefore, when the road surface water condition is between A ₁ and A ₂ , the road surface set temperature is the snow melting temperature T ₁
Is held. The operating condition of this system will be described with reference to FIG. 2 showing the relationship between the road surface set temperature and the road surface water condition.
It looks like this: That is, in FIG. 2, the vehicle is started under the operating conditions, and when the wet condition of the road surface moisture becomes less, the operation is performed under the operating condition, and when the wet condition of the road surface moisture becomes less than A ₂ , the operating condition is performed.

2) On the other hand, the road surface moisture detector 1 is
State A_TwoLess wet than road surface moisture condition
Then, the road surface moisture determination unit 2a predicts the road surface set temperature.
Heat temperature T_TwoOFF delay timer 2b
It is given to the road surface temperature setting unit 2c through. Road surface
From the constant temperature indicator 2c, the preheating temperature T_TwoThe road surface temperature of
It is input to the road surface temperature control output unit 3b and the road surface temperature control output is output.
Part 3b has this temperature T_TwoControl the road surface temperature. Road surface setting
The temperature is the snow melting temperature T_TwoPredetermined time after the instruction signal for
During t, the off-delay timer 2b keeps track of the road surface temperature setting.
The road surface temperature setting is T
_TwoIs held. Next, the road surface moisture condition is A_TwoIs it the state of
Wetness increases, and the standard road surface water condition A₀And further
A₁In the state of, the set temperature is changed to the snow melting temperature T₁Set to
Is sent from the road surface moisture determination unit 2a to the off
It is output to the road surface temperature setting section 2c through the marker 2b.
From the road surface temperature setting section 2c, the snow melting temperature T₁Road surface setting
The temperature is input to the road surface temperature control output unit 3b, and the road surface temperature control is performed.
The output unit 3b has this temperature T ₁Control the road surface temperature. Obedience
Therefore, the road surface water condition is A₁And A_TwoBetween the road set temperature
Is the preheating temperature T_TwoIs held. Operation of this system
Figure 2 shows the relationship between the road surface temperature setting and the road surface moisture condition.
A more detailed description is as follows. That is, in FIG.
Start on operating conditions, and there is a lot of moisture on the road surface.
Driving conditions, the road moisture condition
Is A₁When it gets wet more than
Turn over.

As can be seen from FIG. 2, in the operation control system of the snow melting facility of this embodiment, the operating condition shows a hysteresis phenomenon, and the road surface temperature is constant between the road surface moisture conditions A ₁ and A ₂ , and the There is no stable switching of the set temperature. A ₁
The wider the distance between A and A ₂ , the more stable the switching of the set temperature is without being affected by the disturbance.

In the above embodiment, one reference road surface moisture state A ₀ is provided to switch the road surface set temperature. However, a plurality of reference road surface moisture states are provided, and the above-mentioned hysteresis phenomenon occurs in each reference road surface moisture state. When the road surface set temperature is switched along with it, more detailed and quick operation control can be performed. Further, the road surface moisture detector is not limited to the one using the resistance change of the above embodiment, but may be one using the change in light transmittance.

[0014]

As described above, according to the present invention, the road
Road surface moisture detector for detecting surface moisture and the road surface moisture detector
Surface temperature setting that sets the set temperature of the road surface by the output of the device
Means and a road surface temperature control hand for controlling the road surface temperature to a set temperature
In the operation control system of the snow melting equipment having steps,
The road surface temperature setting means sets the set temperature to the reference road surface water condition A.
₀Predetermined road surface moisture condition A on the wetter side₁And beyond
Snow melting temperature T with wet road surface₁Set to
Also, the standard road surface moisture condition A₀Predetermined road surface water on the dry side
Minute state A_TwoPreheated on wet road surface conditions below and below
Temperature T_Two(T_Two<T ₁) And state A₁And state A_Two
Between, the road surface water condition is state A₁To state A_TwoChange to
If you do snow melting temperature T₁Set to state A_TwoFrom the state
A₁Preheating temperature T_TwoThe function to set to
And the road surface temperature setting means switches the set temperature.
After that, hold the set temperature after switching for a predetermined time.
Since it has a function to switch between preheating operation and snow melting operation,
To prevent unstable vibration (hunting)
It has the effect of being able to do.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of an operation control system for snow melting equipment according to the present invention.

FIG. 2 is a diagram illustrating a relationship between a road surface set temperature and a road surface moisture state, which explains an operating condition of the system.

[Explanation of symbols]

 1 Road Surface Moisture Detector 2 Road Surface Temperature Setting Means 2a Road Surface Moisture Judging Unit 2b Off-Delay Timer 2c Road Surface Setting Temperature Indication Unit 3 Road Surface Temperature Control Means 3a Road Surface Temperature Sensor 3b Road Surface Temperature Control Output Unit

Claims (2)

[Claims] 1. A road surface moisture detector for detecting road surface moisture,
In the operation control system of the snow melting equipment having a road surface temperature setting means for setting a set temperature of the road surface by the output of the road surface moisture detector and a road surface temperature control means for controlling the road surface temperature to the set temperature, the road surface temperature setting means is The set temperature is a predetermined road surface moisture state A ₁ on the wet side of the reference road surface moisture state A ₀ , and the snow melting temperature T when the road surface moisture state is more wet than that.
₁ is set, and the preheating temperature T ₂ (T ₂ <T ₁ ) is set in a predetermined road surface water condition A ₂ on the dry side of the reference road surface water condition A ₀ and a road surface water condition wet below that. Between the state A ₁ and the state A _2, the snow melting temperature T ₁ is set when the road surface moisture state changes from the state A ₁ to this state, and the preheating is performed when the state changes from the state A ₂ to this state. In the snow melting equipment, the road surface temperature setting means has a function of setting the temperature T ₂ and the road surface temperature setting means has a function of maintaining the set temperature after switching for a predetermined time after switching the setting temperature. Operation control system. 2. The operation control system for snow melting equipment according to claim 1, wherein a plurality of reference road surface water states A ₀ are provided.