JPH1038331A - Control system for ventilation in parking space - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent temperature from extremly rising or the concentration of toxic gas except CO from being increased in a parking space, increase the life of an entire system and prevent the concentration of CO gas from rising in some parts. SOLUTION: The concentration of CO gas in a parking space which is detected by CO sensors 1-1 to 1-n is respectively smoothed and the worst value of the smoothed concentration of CO gas by the CO sensors 1-1 to 1-n is taken out as a central value. While the operations of exhaust fans 3-1 to 3-m are controlled in accordance with the concentration of CO gas taken out as the central value, the operations of the exhaust fans 3-1 to 3-m are monitored. When the stop state of the fans continues for time of TOFF, the exhaust fans 3-1 to 3-m are forcedly operated for time TON.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking lot ventilation control system for controlling the amount of ventilation according to the concentration of carbon monoxide (CO) gas in a parking lot.

[0002]

2. Description of the Related Art Parking lots, especially outdoor parking lots,
2. Description of the Related Art In a building parking lot such as a parking tower or an underground parking lot, a parking lot ventilation control system is provided for the purpose of reducing the concentration of exhaust gas discharged from a vehicle. For example, in a "ventilation system for a parking lot" disclosed in JP-A-3-244949, a CO sensor is disposed at an appropriate position in the parking lot, and the CO sensor is disposed in accordance with the CO gas concentration in the parking lot detected by the CO sensor. To control the operation of the exhaust fan. That is, according to the CO gas concentration in the parking lot detected by the CO sensor, the power of the exhaust fan is increased when the CO gas concentration is high, and the power of the exhaust fan is decreased when the CO gas concentration is low. doing. In addition, Japanese Patent Application Laid-Open No. 3-244949
In the “ventilation system for parking lot” disclosed in Japanese Unexamined Patent Publication, a plurality of CO sensors are arranged at appropriate positions in the parking lot,
The average value of the CO gas concentration detected by the O sensor is obtained, and the operation of the exhaust fan is controlled according to the average value. That is, according to the average value of the CO gas concentrations in the parking lot detected by the plurality of CO sensors, the power of the exhaust fan is increased when the average value is high, and the power of the exhaust fan is decreased when the average value is low. Control.

[0003]

However, in the above-described parking lot ventilation system, the exhaust fan is not started unless the CO gas concentration in the parking lot becomes high to some extent. That is, when the CO gas concentration at the installation location of the CO sensor changes to a low concentration, the exhaust fan remains stopped, and ventilation in the parking lot stops for a long time. For this reason, in a parking lot, an extreme rise in temperature, an increase in the concentration of toxic gases other than CO, and the like may occur. In addition, when the exhaust fan is of the on / off control type, that is, C in the parking lot
When the control method is such that the exhaust fan is started when the O gas concentration is equal to or higher than a predetermined value SP1 _CO and the exhaust fan is stopped when the O gas concentration is equal to or lower than a predetermined value SP2 _CO provided with hysteresis for SP1 _CO , The start and stop of the exhaust fan are frequently performed according to the change in the CO gas concentration, and the life of the entire system including the exhaust fan is shortened. Further, in the above-described parking lot ventilation system, a plurality of CO sensors are arranged at appropriate positions in the parking lot, and the operation of the exhaust fan is controlled in accordance with the average value of the CO gas concentration detected by these CO sensors. In this case, despite the presence of a CO sensor with a high detection gas concentration, the detection gas concentration of the other CO sensors is low, so that the average value as a whole is low, the exhaust fan is not started, and the There is a possibility that a portion having a high CO gas concentration may occur.

The present invention has been made to solve such a problem, and an object of the present invention is to prevent an extremely high temperature or a rise in the concentration of a toxic gas other than CO. Another object of the present invention is to provide a parking lot ventilation control system that can extend the life of the entire system and does not have a possibility that a portion having a high CO gas concentration is partially generated.

[0005]

In order to achieve such an object, a first invention (an invention according to claim 1) includes a CO sensor for detecting a CO gas concentration in a parking lot, and a CO sensor for detecting a CO gas concentration in a parking lot. Ventilation fan control means for controlling the operation of the ventilation fan attached to the parking lot according to the CO gas concentration to be performed, and monitoring the operation of the ventilation fan. If the fan stop state continues for a predetermined time (T _OFF ), Ventilation fan forced operation means for forcibly operating the ventilation fan for a predetermined time (T _ON ). According to the present invention, while the operation of the ventilation fan is controlled in accordance with the CO gas concentration in the parking lot, if the stopped state of the ventilation fan continues for the T _OFF time due to the CO gas concentration changing at a low concentration, the ventilation is performed. Fan is T
It is forcibly activated only during the _ON time.

A second invention (an invention according to claim 2) includes a CO sensor for detecting a CO gas concentration in a parking lot,
Smoothing means for smoothing the CO gas concentration detected by the sensor, and ventilation fan control means for controlling the operation of a ventilation fan provided in the parking lot according to the CO gas concentration smoothed by the smoothing means It is provided with. According to the present invention, C detected by the CO sensor
The O gas concentration is smoothed, that is, instantaneous large fluctuations in the CO gas concentration detected by the CO sensor are removed, and the operation of the ventilation fan is controlled according to the smoothed CO gas concentration.

A third invention (an invention according to claim 3) is a CO sensor for detecting a CO gas concentration in a parking lot,
Smoothing means for smoothing the CO gas concentration detected by the sensor, and ventilation fan control means for controlling the operation of a ventilation fan provided in the parking lot according to the CO gas concentration smoothed by the smoothing means And ventilation fan forced operation means for monitoring the operation of the ventilation fan and forcibly operating the ventilation fan for a predetermined time (T _ON ) when the fan stop state continues for a predetermined time (T _OFF ). is there.
According to the present invention, while the operation of the ventilation fan is controlled in accordance with the CO gas concentration in the parking lot, if the stopped state of the ventilation fan continues for the T _OFF time due to the CO gas concentration changing at a low concentration, the ventilation is performed. The fan is forcibly activated for the T _ON time. Further, the CO gas concentration detected by the CO sensor is smoothed, that is, instantaneous large fluctuations in the CO gas concentration detected by the CO sensor are removed, and the ventilation fan is controlled according to the smoothed CO gas concentration. The operation is controlled.

[0008] A fourth invention (an invention according to claim 4) provides a first to an N-th CO sensor for detecting a CO gas concentration in a parking lot, and a CO detected by the first to the N-th CO sensor.
Smoothing means for smoothing the gas concentration individually, and C of the first to Nth CO sensors smoothed by the smoothing means.
A representative value extracting means for extracting the worst value in the O gas concentration as a representative value, and an operation of a ventilation fan attached to a parking lot is controlled according to the CO gas concentration extracted as a representative value by the representative value extracting means. Ventilation fan control means;
The operation of the ventilation fan is monitored, and if the fan stops for a predetermined time (T _OFF ), the ventilation fan is _{turned on} for a predetermined time (T _ON ).
And forced ventilation fan forced operation means. According to the present invention, the first to N-th CO
The CO gas concentration in the parking lot detected by the sensor is smoothed individually, and the worst value of the smoothed CO gas concentrations of the first to Nth CO sensors is taken out as a representative value,
While the operation of the ventilation fan is controlled in accordance with the CO gas concentration extracted as the representative value, the stopped state of the ventilation fan is T _OFF time because the CO gas concentration extracted as the representative value changes at a low concentration. If you continue, the ventilation fan will be _ON
It is forcibly activated only for time.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a system configuration diagram showing an embodiment of the present invention. In FIG.
n is a CO sensor located at an appropriate position in the parking lot, 2
Denotes a programmable controller, and 3-1 to 3-m denote exhaust fans attached to the parking lot. The programmable controller 2 has an input unit 2-1, an operation unit 2-2, and an output unit 2-
3 is provided.

Next, the operation of this system will be described with reference to the functions of the programmable controller 2. The CO gas concentration in the parking lot detected by the CO sensors 1-1 to 1-n is given to the input unit 2-1 of the programmable controller 2.

The arithmetic unit 2-2 takes in the current values of the CO gas concentrations PV1 _{CO to} PVn _CO from the CO sensors 1-1 to 1-n supplied to the input unit 2-1 (step 201 shown in FIG. 2). . The current value of the CO gas concentration PV1 _CO
A first-order lag filter (Equation (1)) is applied to .about.PVn _CO (step 202). Thus, the current value PV1 _CO ～PVn _CO of CO gas concentration is smoothed, PV1 _CO ~
Instantaneous large fluctuations in PVn _CO are eliminated. In equation (1), U is the current output, U0 is the previous output, V is the current input, TS is the sampling period, and T1 is the delay time. U = U0 + TS · (V−U0) / (TS + T1) (1)

The operation unit 2-2 calculates the smoothed C
Current value PV1 _CO ～PVn highest value in the _CO in O gas concentration (worst value) and the representative value PV _CO (step 203). Then, the representative value PV _CO and a predetermined set value SP
1 _CO (Step 204), and PV _CO > SP1 _CO
If so, the exhaust fans 3-1 to 3-m are started (step 205). In this embodiment, the set value S
P1 _CO is set to SP1 _CO = 20 ppm.

By starting the exhaust fans 3-1 to 3-m,
If PV _CO ≦ SP1 _CO in step 204, P
It is checked whether V _CO <(SP1 _CO −Dif) (step 206). That is, SP2 _CO that defines Dif as the hysteresis width (see FIG. 3: SP2 _CO = SP1)
Compare _CO- Dif) with PV _CO and check if PV _CO <SP2 _CO . Here, if PV _CO <SP2 _CO , the exhaust fans 3-1 to 3-m are stopped (step 2).
07). In this embodiment, the hysteresis width Dif is set to Dif = 10 ppm. That is, in this embodiment, the set value SP2 _CO is
2 _CO = 10 ppm.

In step 207, the exhaust fans 3-1 to 3-3
When −m is stopped, the process proceeds to step 208 according to “NO” in step 204 and “NO” in step 206. In step 208, the stopped state of the exhaust fans 3-1 to 3-m is monitored, and if the fan stopped state continues for the T _OFF time, the exhaust fans 3-1 to 3-m are forcibly set only for the T _ON time.
(Step 209: see FIG. 4). Note that, in this embodiment, T _OFF and T _ON are T _OFF =
50 min, T _ON = 10 min.

That is, in this embodiment, if the stopped state of the exhaust fans 3-1 to 3-m continues for the T _OFF time due to the CO gas concentration in the parking lot changing to a low concentration, the exhaust fan 3- 1-3-m are forcibly activated only for the T _ON time. Due to the forced intermittent operation of the exhaust fans 3-1 to 3 -m, the occurrence of an extreme rise in temperature or an increase in the concentration of toxic gases other than CO in the parking lot can be prevented.

Also, in this embodiment, since the current values of the CO gas concentration PV1 _{CO to} PVn _CO are smoothed, the representative value _{CO CO} of the CO gas concentration compared with the set values SP1 _CO and SP2 _CO is instantaneous. Large fluctuation does not occur. Therefore, the exhaust fans 3-1 to 3-m are not frequently started and stopped, and the life of the entire system including the exhaust fans 3-1 to 3-m is extended.

In this embodiment, the worst value of the current CO gas concentration PV1 _{CO to} PVn _CO is represented by the representative value PV _CO
Therefore, the operation of the exhaust fans 3-1 to 3-m is controlled based on the location where the CO gas concentration is the highest, and there is no fear that a location where the CO gas concentration is high partially occurs.

In this embodiment, 3-1
Although the exhaust fan is described as ３−3-m, it may be an air supply fan. In the present invention, exhaust fans and air supply fans are collectively referred to as
It is a ventilation fan.

Further, in this embodiment, an example has been described in which a plurality of CO sensors are arranged in a parking lot, but a single CO sensor may be provided. In this case, the CO gas concentration detected by only CO sensor smoothes the CO gas concentrations the smoothed as PV _CO, perform step 204 after the processing operation shown in FIG.

[0020]

As is apparent from the above description, according to the present invention, while the operation of the ventilation fan is controlled in accordance with the CO gas concentration in the parking lot, the CO gas concentration changes at a low concentration. If the ventilation fan is stopped for T _OFF time, the ventilation fan will be forced to operate only for T _ON time, preventing the occurrence of extreme temperature rise and increase in the concentration of toxic gas other than CO in the parking lot. Will be able to Also, the CO detected by the CO sensor
The gas concentration is smoothed, that is, instantaneous large fluctuations in the CO gas concentration detected by the CO sensor are removed, and the operation of the ventilation fan is controlled in accordance with the smoothed CO gas concentration. Fans are not frequently started and stopped, and the life of the entire system can be extended. In addition, the worst value in the CO gas concentrations detected by the first to Nth CO sensors is extracted as a representative value, and C is extracted as the representative value.
By controlling the operation of the ventilation fan in accordance with the O gas concentration, there is no fear that a portion where the CO gas concentration is high partially occurs.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of this system.

[FIG. 3] PV _CO , SP1 _CO and SP2 _CO in the calculation unit
FIG. 9 is a diagram illustrating an on / off control logic of an exhaust fan by comparison with FIG.

FIG. 4 is a diagram showing a forcible intermittent operation state of an exhaust fan.

[Explanation of symbols]

1-1 to 1-n CO sensor, 2 programmable controller, 2-1 input section, 2-2 arithmetic section, 2-3 ...
Output unit, 3-1 to 3-m ... exhaust fan.

Claims (4)

[Claims] 1. A CO sensor for detecting a concentration of carbon monoxide (CO) gas in a parking lot, and an operation of a ventilation fan attached to the parking lot is controlled in accordance with the CO gas concentration detected by the CO sensor. A ventilation fan control means for monitoring the operation of the ventilation fan, and forcibly operating the ventilation fan for a predetermined time (T _ON ) when the fan stop state continues for a predetermined time (T _OFF ). Means for controlling a parking lot ventilation. 2. A CO sensor for detecting a carbon monoxide (CO) gas concentration in a parking lot, a smoothing means for smoothing a CO gas concentration detected by the CO sensor, and a smoothing means for smoothing the CO gas concentration detected by the CO sensor. A ventilation fan control means for controlling the operation of a ventilation fan attached to the parking lot according to the CO gas concentration. 3. A CO sensor for detecting a carbon monoxide (CO) gas concentration in a parking lot, a smoothing means for smoothing a CO gas concentration detected by the CO sensor, and a smoothing means for smoothing the CO gas concentration detected by the CO sensor. Ventilation fan control means for controlling the operation of a ventilation fan attached to the parking lot according to the CO gas concentration, and monitoring the operation of the ventilation fan, and when the fan stop state continues for a predetermined time (T _OFF ) And a ventilation fan forced operation means for forcibly operating the ventilation fan for a predetermined time (T _ON ). 4. A first to N-th CO sensor for detecting a carbon monoxide (CO) gas concentration in a parking lot, and smoothing the CO gas concentration detected by each of the first to N-th CO sensors. And first to N-th COs smoothed by the smoothing means.
Representative value extracting means for extracting a worst value in the CO gas concentration of the sensor as a representative value, and operation of a ventilation fan attached to the parking lot according to the CO gas concentration extracted as a representative value by the representative value extracting means. Ventilation fan control means for controlling the operation of the ventilation fan, and a ventilation fan for monitoring the operation of the ventilation fan and forcibly operating the ventilation fan for a predetermined time (T _ON ) when the fan stop state continues for a predetermined time (T _OFF ) A parking lot ventilation control system, comprising: forced operation means.