JP3221213B2 - Rainwater pump operating number control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the number of operating rainwater pumps for starting and stopping a plurality of rainwater pumps in accordance with a pump well water level.

[0002]

2. Description of the Related Art A conventional general system for controlling the number of operating rainwater pumps based on pump well water levels sets a start water level and a stop water level based on the pump well water levels for a plurality of rainwater pumps as shown in FIG. When the pump well water level reaches the set water level, a pump start / stop command is output to adjust the water level.

[0003]

In the above-mentioned pump number control system, when the amount of inflow rainwater or the pumping capacity is large with respect to the volume of the pump well, (1) the pump is controlled in response to an increase in the amount of inflow rainwater. Startup (increase of pumped water) cannot be responded quickly.

(2) The frequency of starting the pump increases.

There are problems such as the following.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has been made in view of the above circumstances. An operation control apparatus for a rainwater pump for quickly starting and stopping the pump and reducing the frequency of starting and stopping the pump in response to a change in the amount of rainwater flowing in is provided. The purpose is to provide.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a plurality of rainwater pumps provided in a pump well are set with start-stop water levels in advance, and the pumps are started or stopped according to the pump well water levels. In the rainwater pump operation number control device that adjusts the well water level, the rainwater inflow predictive calculation formula is given by the following equation based on the correlation between the rainfall measurement value pattern and the rainwater inflow pattern: Q (t) = (Q ₀ (t −t ₀ ) ± ΔQ) · K where Q (t): predicted rainwater inflow data Q ₀ (t): rainfall measurement value t ₀ : delay time constant △ Q: rainfall bias correction amount K: rainfall Is selected as the quantity proportional constant, and the prediction constant t ₀ ,
ΔQ and K are set in the prediction constant setting unit, and the predicted rainwater inflow is calculated by the prediction calculation formula based on the input rainfall measurement value, and the rainfall and predicted rainwater inflow are calculated together with the rainfall measurement value. A storage unit, based on the predicted amount and the amount of change in the pump well water level per unit time, infers an adjustment amount of the set water level for pump start-stop by the fuzzy inference unit, and sets a preset set water level by the adjustment amount. The corrected pump start / stop stored in the corrected water level setting section, and the pump well water level is adjusted by controlling the pump start / stop based on the corrected set water level of each pump according to the pump well water level.

When there is inflow of sewage into the pump well, the adjustment amount of the set pump start-stop water level is determined by the sum of the sewage inflow and the predicted rainwater inflow and the pump well water level change per unit time. The set water level is corrected by fuzzy inference, and start-stop control of the pump is performed.

[0009]

Next, one embodiment of the present invention will be described with reference to the rainfall measurement values, the rainwater inflow pattern diagram of FIG. 1, the functional block diagram of the rainwater pump operation number control device of FIG. 2, and FIGS. b),
A description will be given based on the membership function relating to the pump well water level change amount, the predicted rainwater inflow amount, and the set water level adjustment amount of (c), and the control rules in Table 1.

[0010] In a rainwater pumping station mainly composed of drainage of rainwater due to rainfall, there is a correlation between the measured rainfall value and the rainwater inflow, and the rainwater inflow is determined based on the rainfall measurement value pattern and the rainwater inflow pattern. The quantity is estimated as follows.

Since the peak value of the rainwater inflow pattern into the pump well shown in FIG. 1 appears after a delay time of t ₀ from the peak value of the rainfall measurement value pattern, the rainwater inflow is calculated based on the following prediction operation formula. Make a volume estimate.

Q (t) = (Q ₀ (t) ± ΔQ) · K = (Q ₀ (t−t ₀ ) ± ΔQ) · K where Q (t): predicted rainwater inflow Q ₀ (t ): Rainfall measurement value t ₀ : Delay time constant between the peak of rainfall measurement value pattern Q ₀ (t) and the peak of rainwater inflow pattern Q (t) △ Q: Rainfall bias correction amount K: Rainfall amount Proportional Constant In FIG. 2, 1 is a rainfall amount and a predicted rainwater inflow amount that store the rainfall measurement value Q ₀ (t) input as sampling data and the predicted rainwater inflow amount Q (t) calculated based on the above equation. It is a storage unit.

2 is t in the above equation of the predicted rainwater inflow.
A prediction constant setting unit for setting constants of ₀ , △ Q, and K.

Reference numeral 3 denotes a fuzzy inference unit for inferring an adjustment amount of a pump start-stop set water level based on a pump well water level change amount per unit time shown in Table 1 and a predicted rainwater inflow amount into the pump well. Fuzzy inference of the pump start-stop set water level adjustment is performed based on the control rules, the pump well water level change, the predicted rainwater inflow, and the membership function of the pump start-stop set water level adjustment.

[0015]

[Table 1]

HH: Raise the start water level and the stop water level.

H: Start water level and stop water level are slightly increased.

M: Start water level and stop water level are unchanged L: Start water level and stop water level are slightly lowered LL: Start water level and stop water level are lowered 4 is a pump start-stop correction water level setting unit, and the fuzzy inference unit 3 The adjustment amount of the pump start-stop water level, which is the inference output of, is input to set the corrected water level.

Reference numeral 5 denotes a pump operation number control unit which inputs a water level signal of a pump well and starts and stops the rainwater pump based on an output of the pump start / stop correction water level setting unit 4.

Next, the operation will be described with reference to FIG.

First, a rainfall amount proportional constant K, a bias correction amount △ Q, and a delay time constant t ₀ are set in the prediction constant setting unit 2, and are sent to the rainfall amount and predicted rainwater inflow amount storage unit 1.

In the rainfall amount, the predicted rainwater inflow amount, and the storage unit 1,
The rainfall measurement value Q ₀ (t) of the sampling data is input and stored sequentially. At the same time, a predicted rainwater inflow Q (t) is calculated and stored by a prediction operation formula based on the rainfall measurement value Q ₀ (t) and the prediction constant △ Q, K, t ₀ , and output to the fuzzy inference unit 3. I do.

The fuzzy inference unit 3 is constructed as shown in FIGS.
Using the membership function of (c), change in pump well water level per unit time ΔH input as shown in Table 1
And the following control rule (fuzzy rule) with the predicted rainwater inflow Q (t) into the pump well and the start-stop set water level adjustment SLC as the predicted item, ie, IF ΔH = U and Q (T) = CR THEN SLC = LL IF ΔH = U and Q (t) = N THEN SLC = L IF ΔH = D and Q (t) = DCR THEN SLC = HH Perform fuzzy inference.

The start-stop set water level adjustment amount of the rainwater pump, which is fuzzy inferred and output every unit time from the fuzzy inference unit 3, is sent to the pump start-stop correction water level setting unit 4, and the preset pump start-up is performed. The stop water level is corrected and the corrected water level is stored.

The pump operation number control unit 5 receives a pump well water level signal, performs start-stop control of a plurality of rainwater pumps based on the pump start-stop setting corrected water level, and adjusts the water level of the pump well.

The present apparatus can be used with an industrial personal computer with a built-in fuzzy controller as shown in FIG. 4A alone or with an industrial personal computer with a built-in fuzzy controller as shown in FIG. It is composed of a combination of a sequence controller (digital controller) having a signal input / output function.

When the inflow of sewage together with rainwater is taken into consideration, Japanese Patent Application No. 5-126665 ( Japanese Patent Application Laid -Open No.
See JP 6-336982) it is possible to combine the "number of operating control apparatus for sludge pump".

That is, the sum of the predicted sewage inflow amount selected according to the calendar and the predicted stormwater inflow amount of the present invention is calculated from the pump well, based on the inflow sewage amount prediction pattern set according to weekdays, holidays, and special days. Is input to the fuzzy inference unit 3 as a predicted value of inflow to the pump, and the pump start-stop correction water level setting unit 4 is fuzzy inferred by the pump start-stop set water level adjusting device.
, The pump start-stop water level set value is corrected, the corrected water level is set in the pump operation number control unit 5, and the rainwater pump is started and stopped according to the water level change of the pump well to adjust the water level of the pump well. Do.

[0029]

As described above, the calculation formula for predicting the rainwater inflow is selected based on the correlation between the measured rainfall pattern and the rainwater inflow pattern, and the prediction calculation formula is used for the prediction based on the rainfall data. While calculating the rainwater inflow data and storing it together with the rainfall amount, fuzzy inference is performed for each unit time based on the predicted amount and the change in the pump well water level to obtain an adjustment amount of the start-stop set water level of the rainwater pump to obtain the set water level. Is corrected, the number of operating rainwater pumps is controlled based on the set water level, and the water level of the pump well is adjusted. (1) Start-stop of the rainwater pump, That is, it is possible to quickly respond to an increase or decrease in the amount of pumped water.

(2) The frequency of starting and stopping the rainwater pump can be reduced.

(2) It is also possible to perform control taking into account the inflow of sewage.

This has an excellent effect.

[Brief description of the drawings]

FIG. 1 is a diagram showing rainfall measurement values and rainwater inflow patterns.

FIG. 2 is a functional block diagram of the rainwater pump operating number control device of the embodiment.

FIG. 3 (a) Membership function of pump well water level change, (b) Membership function of predicted rainwater inflow,
(C) Membership function of the set water level adjustment amount.

FIG. 4 is a hardware configuration (a), (b) of the embodiment.

FIG. 5 is an explanatory diagram of controlling the number of operating rainwater pumps in the related art.

[Explanation of symbols]

1: rainfall, rainwater inflow storage unit 2: rainwater inflow prediction constant setting unit 3: fuzzy inference unit 4: rainwater pump start-stop correction setting unit 5: pump operation number control unit Q ₀ (t): rainfall measurement Value pattern Q (t): Rainwater inflow pattern

Claims (3)

(57) [Claims] An apparatus for controlling the number of operating rainwater pumps, wherein a start-stop water level of a plurality of rainwater pumps provided in a pump well is set in advance, and the pump is started or stopped according to the pump well water level to adjust the pump well water level. In the rainfall amount calculated based on the input rainfall measurement value based on the prediction calculation formula selected based on the correlation between the rainfall measurement value pattern and the rainwater inflow pattern, and stored together with the rainfall measurement value A predicted rainwater inflow storage unit, a prediction constant setting unit for setting a prediction constant according to the prediction operation formula, and a pump start-stop setting based on the pump well water level change per unit time and the predicted rainwater inflow. A fuzzy inference unit for inferring a water level adjustment amount; a pump start-stop correction water level setting unit for correcting and storing a preset set water level by the adjustment amount; Starting the pump based on the setting modification level depending on the well water level - number of operating control apparatus for rainwater pump, characterized in that it comprises a controlled stop pump operation number control unit for adjusting the pump well water level. 2. The prediction calculation is performed by the following equation: Q (t) = (Q ₀ (t−t ₀ ) ± △ Q) · K where Q (t): predicted rainwater inflow data Q ₀ (t): rainfall measured value t _0: delay time constant △ Q: bias correction amount of rainfall K: number of operating control apparatus for rainwater pump of the first term, wherein to perform based on the rainfall proportionality constant. 3. The method according to claim 1, wherein the fuzzy inference is performed based on a sum of the predicted rainwater inflow amount and the sewage inflow amount and a pump well water level change per unit time, if there is a sewage inflow. Rainwater pump operation number control device.