JPH0464700A - Ventilation controller for road tunnel - Google Patents

Abstract

PURPOSE:To improve the reliability of ventilation control by promoting the setting of car numbers on the basis of a command of the number of driving units by the measured value of concentration of contamination and ventilating load for the ventilation control in a road tunnel, and compensating the unit number command value of feedback control. CONSTITUTION:Contamination concentration value is inputted from a ventilating means 20 and a contamination concentration measuring means 30 in a road tunnel 10 and on the basis of this value, control operation takes place. In addition, on the basis of ventilation load in the tunnel 10, the minimum value of the number of units is set at each constant time by a setting value setting means 70 for ventilating means operating unit numbers. Then, a command value of ventilating means operating unit numbers from a feedback control means 50 is compensated so as not to make the operating unit numbers smaller than the minimum value of the setting means for the operating unit number setting value of the ventilating means 20. On the other hand, there is provided a ventilation stabilizing means 60 being outputted to the ventilating means 20. With this constitution, the worsening of the concentration of contamination is kept back, thus stable ventilation control can be done in this way.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Field of Industrial Application) The present invention relates to a ventilation control device for road tunnels, and in particular, to perform stable ventilation control by preventing deterioration of pollution concentration, and to reduce power consumption. This invention relates to a ventilation control device for road tunnels that can reduce energy consumption and save power.

(Prior art) In general, in longitudinal road tunnels, it is necessary to suppress the pollution concentration inside the road tunnel, which is contaminated by harmful substances contained in automobile exhaust gas, to a permissible value or less, so jet fans, etc. Mechanical ventilation is usually used. Contaminants are propagated by the ventilation air inside this tunnel.

On the other hand, in road tunnels where the traffic volume is not so large and the length is not so long, about 2,000m class, a pollution concentration measuring device that measures the pollution concentration is usually installed as a ventilation sensor. Feedback control is performed using the contaminant concentration value from a measuring device.

However, the ventilation process in this type of longitudinal road tunnel is generally expressed as a distributed constant system, its characteristics are difficult to grasp, and there is a large amount of wasted time. In addition, when natural wind blows strongly in the opposite direction to the ventilation direction, or in the case of two-way traffic, just a group of cars passing in the opposite direction to the ventilation direction causes pollutants to accumulate in the road tunnel, eventually becoming contaminated. The concentration will deteriorate. Therefore, if ventilation control is performed by simply detecting the concentration of contaminants, there is room for improvement in terms of stability of ventilation control and power saving.

Therefore, recently, in road tunnels where anemometers are not installed, in order to compensate for the deterioration in concentration due to the accumulation of such pollutants and the delay in ventilation control, a fixed number of jet fans are operated at all times. Things are being done.

However, there are certain patterns in the time course of traffic volume, and there are times when traffic volume is high or low, and times when natural wind, including traffic ventilation force, acts positively or negatively in the direction of ventilation. . Therefore, in order to be able to perform stable control during times when the load on ventilation is high,
If the number of jet fans operated was set to a high value, mechanical ventilation would be performed during times when the load on ventilation was low, even though the concentration of contaminants was low, which was extremely wasteful. On the other hand, if the number of operating jet fans is set to a low value, there is a problem in that the concentration of contaminants deteriorates during times when the load on ventilation is high.

(Problems to be Solved by the Invention) As described above, in conventional ventilation control, ventilation control is performed by simply detecting the concentration of pollution, which makes it impossible to perform stable ventilation control as the concentration of pollution worsens. In addition, there was a problem that power saving could not be achieved.

An object of the present invention is to prevent deterioration of pollution concentration and perform stable ventilation control by operating a number of ventilation means commensurate with the ventilation load of a road tunnel, as well as to reduce power consumption and save money. The object of the present invention is to provide an extremely reliable road tunnel ventilation control device that can be motorized.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a ventilation means for ventilating a road tunnel to be ventilated, and measures the pollution concentration inside the road tunnel. a pollution concentration measuring means; a feedback control means for inputting the pollution concentration value from the pollution concentration measuring means; performing control calculations based on the pollution concentration value; and outputting a command value for the number of operating ventilation means; Ventilation means operating number set value setting means for setting the minimum number of operating ventilation means at regular intervals based on the load; and ventilation means operation in which the number of operating ventilation means is set by the set value setting means for the number of operating ventilation means. The ventilation stabilizing means corrects the command value of the number of operating ventilation means from the feedback control means so that the number does not become smaller than the minimum value of the number of ventilation means, and outputs the corrected value to the ventilation means.

(Function) Therefore, in the road tunnel ventilation control device according to the present invention, the minimum number of ventilation means in operation according to the ventilation load can be obtained regardless of whether the ventilation load is high or low. By operating the number of ventilation means commensurate with the ventilation load, it is possible to simultaneously achieve both stabilization of pollution concentration control and power saving by reducing power consumption.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic diagram specifically showing an example of the internal configuration of a road tunnel to which the present invention is applied. In FIG. 2, a plurality of jet fans 21a to 21d are installed in the road tunnel 10 as shown in the figure as ventilation means for diluting pollution caused by the driving of the automobile 11.

On the other hand, as a pollution concentration measuring means for measuring the pollution concentration inside the road tunnel 10, two smoke transmittance meters 31a,
31b, and two carbon monoxide detectors 32a, 32b.
are provided as shown in the figure. Here, the smoke transmittance meters 31a and 31b measure the transmittance of light in the air inside the road tunnel 10, and the measured values VII,
VI2 is a value indicating the pollution concentration within the road tunnel 10.

Further, the carbon oxide detectors 32a and 32b measure the carbon monoxide concentration value COI of the air inside the road tunnel 10.

It detects CO2.

Next, FIG. 1 is a block diagram showing a basic configuration example of a road tunnel ventilation control device according to the present invention. In FIG. 1, a ventilation means 20 consisting of, for example, a plurality of jet fans is installed in the aforementioned road tunnel 10 from the viewpoint of discharging pollutants exhausted from traveling automobiles.

In addition, the smoke transmittance meter 31 is located inside the road tunnel 10.
a, 31b, - carbon oxide detector 32a.

A pollution concentration measuring means 30 consisting of 32b is installed,
Contamination concentration values Vll, V from this contamination concentration measuring means 30
The configuration is such that the operation of the ventilation means 20 is controlled based on I2.

That is, the pollution concentration value Vl from the pollution concentration measuring means 30
l and VI2 are input to the feedback control means 50. This feedback control means 50 inputs the pollution concentration values Vll and VI2 from the pollution concentration measurement means 30,
By using control calculations such as normal PI, PID control calculations, or fuzzy control calculations, control output for controlling concentration fluctuations due to excess or deficiency of ventilation due to changes in traffic volume or natural wind, that is, jet fan The command value NJF for the number of operating vehicles is calculated and output.

On the other hand, the traffic volume measuring means 40 measures the traffic volume of automobiles within the road tunnel 10.

Further, the jet fan operation number setting value setting means 70 is
Input the traffic volume that is the output from the traffic volume measurement means 40,
The minimum value NJPn of the number of operating jet fans is determined and set at regular intervals.

Further, the ventilation stabilizing means 60 controls the feedback control means 50 so that the number of jet fans in operation does not become smaller than the minimum value NJF of the number of jet fans in operation set by the jet fan operation number setting value setting means 70.
The command value NJP for the number of jet fans in operation, which is the control output from the controller, is corrected, that is, the larger value of NJP or NJP is selected and output to the ventilation means 20.

In this embodiment, it goes without saying that the carbon monoxide concentration values CO1 and CO2 detected by the pollution concentration measuring means 30 are not input to the feedback control means 50, or that these values may be taken in for control. .

Next, the operation of the road tunnel ventilation control device according to this embodiment configured as described above will be explained using the flowchart shown in FIG. In addition, FIG. 3 is a diagram showing specific calculation processing contents of the jet fan operation number set value setting means 70.

In FIG. 1, the pollution concentration inside the road tunnel 10 is measured by the pollution concentration measuring means 30, and the feedback control means 50
is input. The feedback control means 50 performs control calculations such as normal PI, PID control calculations or fuzzy control calculations on the pollution concentration values Vll and VI2 from the pollution concentration measurement means 30, thereby controlling changes in traffic volume and natural wind. A command value NJP for the number of operating jet fans, which is a control output for controlling concentration fluctuations due to excess or deficiency in ventilation amount, is calculated and output.

On the other hand, the traffic volume of automobiles in the road tunnel 10 is measured by the traffic volume measurement means 40, and the traffic volume, which is the measured value, is inputted to the jet fan operation number setting value setting means 70. Then, the jet fan operation number set value setting means 70
Then, based on the traffic volume from the traffic volume measuring means 40, the minimum value NJpe of the number of operating jet fans is determined at regular intervals, and the value is set and input to the ventilation stabilizing means 60.

As a result, in the ventilation stabilizing means 60, the number of jet fans in operation is changed to the number of jet fans in operation set value setting means 7.
Minimum number of jet fans in operation from 0 NJF. The feedback control means 50
The command value NJP for the number of operating jet fans is corrected and given to the ventilation means 20 to
Ventilation will be provided inside.

In this case, the jet fan operation number setting value setting means 70
Then, the traffic volume from the traffic measurement means 40 is inputted, and the traffic volume is predicted every 60 minutes, for example, ventilation calculation is performed based on this predicted traffic volume, and the number of operating jet fans is determined by referring to the ventilation calculation result. The minimum value Nxpa of is determined. FIG. 3 is a flowchart showing the calculation processing contents of the operating jet fan number setting value setting means 70.

That is, the traffic volume prediction means 71 performs step 7 of three stages.
11, 712, 713, the first step 711
is a basic pattern creation means, the second step 712 is a means for predicting the deviation of the traffic volume in the next time period from the basic pattern, and the third step 713 is a means for calculating the predicted traffic volume in the next time period. be. First, the basic pattern creation means calculates, for example, the average traffic volume for the past 30 days in each time period.
It is stored as a basic pattern. Furthermore, the deviation prediction means predicts the deviation in the next time period from the deviation between this basic pattern and today's traffic volume. Further, the predicted traffic volume calculation means adds the predicted deviation for the next time period predicted by the deviation prediction means to the traffic volume of the basic pattern for the next time period.

Next, the ventilation calculating means 72 calculates the required ventilation amount and the required number of jet fans in order to satisfy the target Vl value for the predicted traffic volume calculated by the traffic volume predicting means 71. Furthermore, the minimum number of jet fans in operation N Jp
The fi determining means 73 uses the required number of jet fans calculated by the ventilation calculating means 72 to determine the minimum value T'J, +pa of the number of jet fans in operation, for example, NJP - (required number of jet fans) Xa + b (example)
It is determined based on parameters a-0, 5, and b-1. Here, the parameter b is a correction coefficient used to take into account natural wind and randomness of up and down traffic.

The minimum value NJP of the number of jet fans operating in each hour determined in this way is given to the ventilation stabilizing means 60.

As described above, in the road tunnel ventilation control device according to this embodiment, the minimum number of jet fans in operation NJFe can be set to a small value during times when the ventilation load is low, and the ventilation load can be set to a small value. During high hours, the minimum value NJPa of the number of operating jet fans can be set to a large value.

For this reason, the minimum value NJP of the number of jet fans in operation has good ability to follow daily and secular changes in traffic volume, and can also reflect empirical knowledge and intuition. is obtained. As a result, the number of jet fans is operated according to the ventilation load, which prevents the pollution concentration from worsening and provides stable ventilation control, while also reducing power consumption and saving power. Become.

It should be noted that the present invention is not limited to the above embodiments, but can also be implemented as follows.

(a) In the above embodiment, the minimum value N, F, of the number of jet fans in operation is determined by sequential calculation from the traffic volume measurement value, but the method is not limited to this, for example, as shown in FIG. It is also possible to prepare several tables of the minimum values N, F, of the number of jet fans in operation for each day's time zone in advance, and to use these tables depending on the day of the week or the like. The contents of FIG. 4 are entered offline.

(b) For road tunnels where traffic volume is not measured, or when the traffic volume in a road tunnel cannot be estimated from the measured value of a nearby traffic counter, the amount of pollution generated each hour is estimated and stored, and statistical processing is performed. Using the results obtained, determine the minimum number of jet fans in operation NJF. may be determined.

(c) If the natural wind can be measured, the measured value may be reflected in determining the minimum value N JPa of the number of operating jet fans. That is, for example, during a time period in which the natural wind is expected to blow in the negative direction at a speed of 4 m/s or more, the minimum number of operating jet fans is increased by a certain amount.

(d) In the above embodiment, a jet fan is used as the ventilation means, but the ventilation means is not limited to this, and other means may be used.

[Effects of the Invention] As explained above, according to the present invention, the number of ventilation means commensurate with the ventilation load of the road tunnel is operated, thereby preventing deterioration of the pollution concentration and performing stable ventilation control. In addition, it is possible to provide an extremely reliable road tunnel ventilation control device that can reduce power consumption and save power.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a ventilation control device for a road tunnel according to the present invention, FIG. 2 is a schematic diagram showing an example of the internal configuration of a road tunnel to which the present invention is applied, and FIG. FIG. 4 is a flowchart for explaining the arithmetic processing content of the set value setting means for the number of operating jet fans, and FIG. 4 is a diagram for explaining a method for giving the minimum value for the number of operating jet fans according to another embodiment of the present invention. . 10... Road tunnel, 20... Ventilation means, 21a
~21d...Jet fan, 30...Contamination concentration measuring means, 31a, 31b...Fume permeability meter, 32g,
32b... - Carbon oxide concentration meter, 40... Traffic volume measuring means, 50... Feedback control means, 60...
Ventilation stabilization means, 70... Jet fan operation number setting value setting means, 71... Traffic volume prediction means, 711...
- Means for creating a basic pattern, 712... Means for predicting deviation from the basic pattern of traffic volume in the next time period, 713...
- Means for calculating the predicted traffic volume for the next time period, 72... Means for calculating ventilation, 73... Means for determining the minimum value NJPa of the number of operating jet fans. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 2

Claims (2)

[Claims] (1) A ventilation means for ventilating the inside of the road tunnel to be ventilated, a pollution concentration measuring means for measuring the pollution concentration in the road tunnel, and a pollution concentration value from the pollution concentration measuring means is inputted, and the pollution concentration value is inputted. Feedback control means that performs control calculations based on the concentration value and outputs a command value for the number of ventilation means in operation; and ventilation that sets a minimum value for the number of ventilation means in operation at regular intervals based on the ventilation load of the road tunnel. means for setting a set value for the number of ventilation means in operation; and a means for setting a set value for the number of ventilation means in operation; A ventilation control device for a road tunnel, comprising: ventilation stabilizing means for correcting a command value for the number of operating vehicles and outputting the corrected value to the ventilation means. (2) As the setting value setting means for the number of operating ventilation means,
a traffic volume prediction means for periodically predicting traffic volume based on the traffic volume of a road tunnel measured by a traffic volume measurement means;
ventilation calculation means for calculating the required ventilation amount and the required number of ventilation means by performing ventilation calculation based on the predicted traffic volume from the traffic volume prediction means; 2. The ventilation control device for a road tunnel according to claim 1, comprising: a ventilation means for determining a minimum value; and a minimum value determination means for the number of operating ventilation means.