JPS58129605A - Controlling method for number of running units - Google Patents

Abstract

PURPOSE:To attain highly efficient control by selecting a step making the deviation between a load factor and its objective value in each step minimum at the time of transfer to another step in each control range regulated by the upper and lower limits calculated from the objective value of the load factor. CONSTITUTION:The discharge pressure P0 of five blowers B1-B5 e.g. is detected by a pressure detector 1 and inputted to a total airflow operating circuit 2 to calculate a total airflow requiring value so that the discharge pressure P0 is fixed. An objective load setting circuit 7 determines an objective load factor alphadm by manual or automatic decision setter and sends the objective load factor alphadm to an operation circuit 8 controlling the number of blowers to select the optimum running pattern from all combination of the blowers and apply a blower starting/stopping command. The upper and lower limit values are obtained by adding/subtracting the normal value of the load factor to/from the objective load factor alphadm. At the transfer to a new step, a step to minimize the deviation between the load factor and the objective load factor is selected.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a total capacity 1 The present invention relates to a method for controlling the number of operating machines in which an optimal combination is determined from among all combinations of parallel operating machines to satisfy the specified value, and a start/stop command is given to each machine to be controlled.

[Technical background of the invention]

For example, when controlling target equipment such as a pro-air with a constant discharge pressure, the suction valves of each unit are controlled once according to the required air volume in general gross processing, and when the required air volume cannot be satisfied with the number of units in operation at that time, the pro As mentioned above, in order to satisfy the required value, that is, the total capacity required value, determined by a predetermined method, the number of operating machines to be controlled is controlled, the number of rotations is controlled, and the discharge valve opening is performed. Control is often performed in combination with degree control, etc.

In this case, the method for controlling the number of machines in operation is that if the total capacity cost required fIkt cannot be satisfied with the number of machines in operation at that time, the output, that is, the total capacity obtained by the combination of the machines to be controlled, is divided into a plurality of stages, or stages. In addition, a method is often used in which nine combinations of machines to be controlled are prepared to obtain an output for each step, and the optimal combination/turn is determined from among them.

For example, 2 small capacity units, 1 medium capacity unit, 2 large capacity units,
The number control of a total of five proers will be explained.

Table 1 shows the air blowing capacity of each of the proars in this example (expressed as a relative value with the minimum capacity being 1).

Conventionally, a control device for controlling the number of devices as described above has been configured as shown in FIG.

[In Figure 1, 111 to B6 are fa as controlled target machines.
It is a. As for the control content, the discharge pressure P. detected by the pressure detection device 1 is inputted to the total air volume calculation (b) path 2. The total air volume calculation circuit 2 calculates the total air volume required values Q and Y by, for example, PI calculation, so that the discharge pressure P@ is constant.The zero unit control calculation circuit J receives the Proa operation status signal through the input/output interface circuit 4. is input.

In addition, the unit number control arithmetic circuit 3 divides the output, that is, the total air volume obtained by the combination of multiple units (operating units are marked O) as shown in Table 2, into multiple stages, and each stage, ! All nine driving parables are prepared for each case.

Then follow the steps shown in the flowchart shown in Figure 2.
The optimum operation turn is selected from all the combinations (processes 81 to S4 in FIG.
Give start/stop commands to faA B1 to BJ of the machine (process 81 in Figure 2) @ (a) Determination of total air volume status, f The ratio of the total air volume request value qav to the maximum air volume QM (hereinafter referred to as the "load ratio") is set by the load ratio upper and lower limit value setting circuit 5. Steps are changed when the following relationship is established for α. α, ＜
, 11 <α, is selected (processing 82
).

(b) Minimum start/stop frequency No-turn determination (a) Selected in step 9, the state change is such that the start/stop frequency from the current driving pattern becomes the minimum in the 4 turns of the entire operation corresponding to f. A plurality of driving/arm turns are selected to minimize the number of turns (processing 81).

f) Among the nine plurality of driving turns selected in the priority order determination (b), the driving turn with the highest priority is selected according to the priority order determined by the priority order determination circuit 6 (processing S4). ,
The priority order determining circuit 6 performs automatic setting based on the cumulative operating time value.
Before, faA B is set by manual settings directly set by the operator.
1 to B, the priority order is determined.

[Problems with background technology]

In this conventional method, the total air volume step (a) in (a) is selected, and all the corresponding driving arm turns are subject to 0. For example, in Table 2, α, = 100S,
When α,=5011, Q and v are determined by the total air volume calculation circuit 2 as 3.
If it is calculated as 31, then the total air volume step is 44,5
, 6 are selected.

Therefore, when selecting a new step, it is not possible to specify whether to select a step f with a large total air volume or a step f with a small total air volume.

Also, since the load factor upper limit value α, load factor lower limit value α, are fixed, from the step at that point to the new step, ff1
The criteria for transitioning to c is always constant, for example, as soon as possible, the transition is made to a step with a large total air volume.

It is not possible to perform complex judgment processing such as moving from 1 to 7"K to a small stay.

By the way, when controlling the number of important devices such as pumps, pumps, etc., the idea is to reduce power consumption even if the frequency of starting and stopping increases by controlling the number of devices, and the idea of reducing power consumption by controlling the number of devices even if the power consumption increases slightly. - There is a concept of reducing the frequency of stoppages and preventing equipment deterioration.

Applying these 2t* concepts to the method of controlling the number of units that we are using this time for the US, in the former case, you should operate with a step that has the smallest possible total air volume, and in the latter case, you should operate with a step that has as large a total air volume as possible. It turns out.

In the conventional method, as mentioned above, the overall idea is to operate with a station with a large total air volume, or with a small station! There is no built-in judgment as to whether or not to operate the engine, and among all the steps and f that satisfy the total air volume requirement, the pattern that currently has the least starting/stopping strength from the tatari turn and has a high priority is selected. . Therefore, it is possible to reduce power consumption and run without being able to perform start/stop control by controlling the number of units or by controlling the number of units.

[Purpose of the invention]

The present invention as a whole provides a station with a large total air volume.

! The purpose of the present invention is to provide a method for controlling the number of vehicles that allows advanced control and good controllability by setting in advance whether the vehicle is to be operated with a small step or with a small step.

[Summary of the invention]

The 4I imitation of the present invention belongs to the stage in which, when controlling the number of control target machines of several consorts, the output obtained by the combination of these control target machines is divided into a plurality of stages in advance to satisfy the required output amount. In a method of controlling the number of operating units that selects the optimal combination/nonaturn from among all combinations/paraturns, the upper and lower limits that define the control range of each stage are the ratio of the required output amount to the maximum answer amount value. It is calculated from the target value of the load factor, and when moving to another stage, the stage where the deviation between the load factor of each stage and the target value is the minimum is selected.

[Embodiments of the invention]

FIG. 3 shows the configuration of an embodiment of the present invention, and parts having threshold-like functions as those in FIG. 1 are designated by the same reference numerals.

The target load factor setting circuit 7 has the function of determining the target load factor adm by manual setting using a CRT (cathode ray tube) display device, etc., or automatically setting by other judgment processing, and providing that information to the number control calculation circuit 8. The zero number control calculation circuit 8 selects the optimum operation/nine turns from all the combinations according to the procedure shown in the 70-chart shown in Fig. 144. Processes T1 to T6 in Fig. 4) and the turn of the operation. Give start/stop commands to the five Proa BJ-B4s through the input/output interface circuit 4 according to the input/output interface circuit 4 (processing TF in Figure 4) @ (1) Calculation of load factor upper and lower limit values Load factor upper limit value α, Load The rate lower limit value αLt-1fi is calculated as follows from the target load rate αdm determined by the load rate setting circuit 7 (processing TJ).

αg=adm+αL″αdm −X However, since the xld load factor is the specified value, To is the difference between the target load factor α Tsumugi and the load factor upper and lower limits α Tsumugi and αL. The control range is defined.

(2) Determining the total air volume step and g The load factor, which is the total air volume required value Qsv for the maximum open lid QM of the 4th turn of the current operation, is calculated in (1).9 Load factor upper limit value α, Load factor lower limit value If the following relationship exists for α, Ste,! fj! (Process sr! L Qav) α, 14 ii Maru line Qav □〈α, -DQ 9M (However, DQ is a dead zone) When determining a new stage, all Stellas are selected and processed TJ), As a result, select the corresponding step (process T4
).

(3) Start/stop S degree minimum and decisive method for turning (
(b) Items 11 and 11 use the same method to select the lowest starting/stopping frequency turn from all operation/hard turns selected in (2) and corresponding to the nine steps (processing TJ) 41 (4) Priority order Determination conventional method By almost the same method as in section (c), prioritized Nl4P is selected from the patterns of the number 'IP, , 11I selected in (3).
Select the pattern with the highest F (where) aiT#.

That is, the following two points are different between the method for controlling the number of units shown in this embodiment and the conventional method.

(a) Load factor upper limit value α, load factor lower @ value αLf: Not fixed, target load factor αdB1 g load''4 regulation ttj
It is good to have the form calculated from i x using the following formula.

αyo=αdm+x α□=αdrrl−x In the number of flights, I Bee 6o1 It is now possible to select the step that minimizes the value.

Next, nine control operations based on the control force method for the number of operating vehicles will be explained in detail.

The load factor upper limit value αHAIL and cargo load lower limit value αL in the overall weaving lid stage and the operation pattern at that time are −load factor αd,
It changes depending on the size of the value. When αdn+ is large, welfare α1
increases as αda increases, so the switch to step f, which has a smaller total air volume, occurs earlier than when αL is fixed. In addition, when α4m is small, α厘 decreases according to αd1, so the switch to the stage with a large total air volume occurs earlier than when αI is fixed.

Next, when selecting a new step, S, select the step or g where α,〈 is the minimum, so if α4m is large, the step or g with the small total air volume is selected, and if α4m is small, the step or The larger step and f will be selected.

Therefore, the larger α4m, the smaller the total air volume,
Also, the smaller the α4m, the bigger the wind cover! By changing the admo value to be set, #, Kji is large, ! It is possible to specify whether to drive with a small steering wheel or a small steering wheel.

In this way, depending on the value of the target load factor αdm that can be set, it is possible to specify whether to operate with a large-capacity steg or a small-capacity steg as a basic concept of number control, and the power consumption It is now possible to easily specify whether to perform 9-speed operation with an emphasis on power, or to reduce the frequency of starting and stopping by controlling the number of units, realizing highly efficient control of the number of units with good controllability and operability. can.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with various modifications within the scope of the gist thereof.

For example, even if the capacity and number of target machines are different, the circuit and control method used in the above example can be applied as is by simply changing each data in Table 2, which improves overall reliability. It is a good gift.

Further, in the same embodiment, each of the nine circuits shown in FIG. 13 will be described as a hardware element, but it is of course possible to realize the same functions with software elements of a computer.

Furthermore, although the load factor specified value X was considered to be the same for both the load factor upper limit value α and the load factor lower limit value αL, it is also possible to set different load factor specified values for each.

〔Effect of the invention〕

According to the present invention, a station with a large total air volume can be operated at f, or a station with a small total air volume can be operated! You can set in advance how to operate the machine, allowing advanced control and control.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the configuration of a conventional number control system, FIG. 2 is a flowchart showing a control method on the same side, and FIG. 3 is a block diagram of a system controlling the number of machines according to an embodiment of the present invention. , FIG. 4 is a flowchart showing a control method in one embodiment. 1...Pressure detection device, 2...Total air volume calculation circuit, 4.
... Input/output interface circuit, 6... Priority order determining circuit, 1... Target load factor setting circuit, 1... Number control calculation circuit, BJ to Bj... Proa. Applicant's agent Patent attorney Takeshi Suzue Disciple 1 drawing '1'" r--1 1Qsv 1 .11 □ Hard (raw I 6 4j fit I,,ol 1 word" 1 1 1 1 11 1 1 1

Claims (1)

[Claims] In order to control the number of multiple control target machines, the output obtained by the combination of these control target machines is divided into multiple stages in advance, and all combinations and data turns belonging to the stage that satisfy the required output amount are created. In a method for controlling the number of operating units in which an optimal combination of f-turns is selected from among the above, the upper and lower limits that define the control range of each stage are set as the target value of the load factor, which is the ratio of the required output amount to the extremely large capacity value. A method for controlling the number of operating vehicles, characterized in that when moving to another stage, a stage is selected in which the deviation between the load factor of each stage and the target value is minimum.