JPS6115578A - Fan motor controlling method in combustion controller - Google Patents

Abstract

PURPOSE:To always optimally control by selecting a correction coefficient in response to a deviation range between a set rotating speed and the actual rotating speed, and calculating target rotating speed data on the basis of the coefficient and the set speed. CONSTITUTION:A differential amplifier 60 outputs a deviation amount between set rotating speed data es and the actual rotating speed data em, comparators 41-46 and exclusive OR circuits 31-33 detect the range of the deviation amount and output a signal. Adders 11-14 multiply the correction coefficient in response to the outputs of the circuits 31-33 by the deviation amount, add the rotating speed data corrected to the set rotating speed data es to apply the target speed data St to a fan motor drive circuit 70. Thus, the fan motor can be preferably controlled in all deviation range.

Description

Detailed Description of the Invention [1. Field of Industrial Application] The present invention relates to a combustion control device for a water heater or the like, and in particular to a fan for supplying an amount of air to a combustion section according to a required combustion amount.・Related to a fan motor control method that optimally controls a motor.

[11, Prior Art] Modern water heaters detect the temperature and amount of water supplied, as well as the temperature of the hot water being dispensed, and based on these data, set the temperature of the hot water to the user's desired setting. Increasingly, the number of devices equipped with a main control device that controls the temperature as close as possible to .

However, in these systems, the amount of air supplied to the combustion section must also be optimally controlled in accordance with the required combustion amount determined from time to time as described above. Otherwise, there is a risk that not only combustion efficiency will be lowered but also incomplete combustion will occur.

Therefore, from the past, 1. In order to optimally control the air supply amount,
There is a method of controlling the rotation of the fan motor that forcibly feeds the air to the combustion section (PID control (proportional, fine//), Jh/IJ control), or using a fan damper to adjust the angle of this tamper. It had been proposed.

[Problems to be solved by the m0 invention] However, the latter method mentioned in ``2'', that is, the method of mechanically adjusting the damper angle, already has problems with its accuracy itself due to the control mode of the control system. can be.

It was not possible to supply the optimum air j7) according to the combustion amount at the time to the combustion section with high accuracy, and it was not possible to achieve high combustion efficiency.

On the other hand, the method of the song title to control the rotation of the fan motor is
Although the concept is correct, there was a problem with the form of PID control.

That is, in the conventional fan mode control using PID control, the current fan value is calculated as a result of calculation.

The only question that matters is whether or not there is a deviation between the rotation speed set by the motor rotation control signal and the fan motor rotation speed at No matter how fast the deviation is, the point in the feedback control system is ii1'! Correction coefficients such as gain constants were kept constant over the entire deviation range.

Therefore, if this gain constant or correction coefficient is set at the initial design stage to suit the case where the fan/motor rotation deviation is small, the disadvantage is that the response time of the control system will become longer when the rotation deviation becomes large. On the other hand, if the setting is set according to a large deviation, a hunting phenomenon may occur when the deviation is small.

The present invention was made to solve the problems of the prior art, and focuses on the size of the deviation between the fan motor setting rotation speed and the actual rotation speed, and depending on the size, By selecting the optimum gain constant or correction coefficient, the fan can be accurately operated with the shortest control system response time and without disadvantages such as hunting within the entire range of controllable deviations in the control system. - Designed to enable feedback control of the motor.

[IV, Means for Solving Problems] In the present invention"-
In order to achieve two objectives, first, the magnitude of the deviation between the set rotation speed and the actual rotation speed of the fan motor is detected. If this is considered as one step of deviation value detection, this corresponds to the function of a differential amplifier if the individual circuit elements are 1-1.

Next, depending on the magnitude of the detected deviation, it is determined which deviation range it falls within. If this is the deviation range determining step, this function can be accomplished using a plurality of analog comparator arrays in terms of individual circuit elements.

After making that determination, select the optimal compensation coefficient 11 that is predetermined as appropriate for the deviation range determined above from among the plurality of compensation coefficients and gain constants. −[−T] This selection is added to the set rotational speed data +T: Compensation based on the coefficient! Add one volume (1) in the beginning of creating the target rotation number data, and send this to the fan motor as an updated fan motor rotation control signal. This function can be realized, for example, by using an analog amplifier array with different advantages (11 to 11) and an adder that performs a selective addition operation depending on human power.

[V, Effect] In the present invention, as described above, first in the deviation amount detection step, the magnitude of the deviation between the set rotation speed and the actual rotation speed of the fan motor can be determined. That is, it is possible to detect the degree of deviation between the desired set rotational speed and the actual rotational speed.

Furthermore, as can be seen from the fact that there is a deviation range determination step and an optimal correction coefficient selection step, the present invention divides the deviation range into several stages in advance and associates a correction coefficient suitable for each deviation range in advance. be.

For example, the correction coefficient is set small for a deviation amount that falls within a relatively small deviation range, and the correction coefficient is set relatively large for a deviation amount that falls within a large deviation range.

Therefore, when the deviation amount is detected in the 1-2 deviation amount detection step,
An optimal correction coefficient is determined to perform correction suitable for the amount of deviation.

Of course, the number of deviation ranges to be divided into stages and the number of types of correction coefficients corresponding to each range can be arbitrarily determined, such as three stages, four stages, etc., or the cost can be reduced by increasing the number of stages. Therefore, when actually commercializing the product, a balance between the two must be taken.

In any case, with the configuration described in [2], in the case of the present invention, if there is a deviation between the set rotation speed of the fan motor and the actual rotation speed, unique control cannot be performed simply because there is a deviation. The amount of deviation is small considering the amount of deviation 11! The correction coefficient is small for , and large when it is large, so that the optimum correction coefficient can be adopted according to the amount of deviation at each time. Therefore, the correction coefficient + E ft1t is also controlled to the optimal value depending on the situation.For example, even if the deviation amount is in the positive or negative direction, when the deviation is positive or negative, the correction value is also increased in absolute amount to speed up the response of the control system. On the other hand, the deviation JJ is +
E, ('tIf the amount is small in either direction, the absolute ld of the correction can be made small to prevent the hunting phenomenon.

[VT, Embodiment] Before explaining the embodiments of the present invention, we will first explain other control modes and device outlines in existing water heaters of this type, such as combustion section control associated with combustion amount determination. See Figure 3.

When the main control device 1 receives a water amount signal S6 from a water amount sensor 6 provided in the water supply channel, it sends a set temperature signal Ss that commands the hot water temperature desired by the user, and a water supply temperature signal provided in the water supply channel. The feed water temperature signal S7 from the sensor 7 and the outlet hot water temperature signal S8 from the outlet hot water temperature sensor 8 provided in the outlet path for detecting the actual outlet temperature are respectively taken in, and from these signals the gas burner 1 is determined. The amount of combustion to be given to the combustion section 3 is calculated. Then, according to the result, a gas proportional valve control signal S4 is sent to the gas proportional valve 4 to control the fuel gas supply amount, and based on the air supply amount or fan motor setting rotation speed data according to the combustion amount, Sends fan motor 5 fan motor rotation amount 4B signal S c 5.

A fan motor rotation speed signal Sr5 indicating the actual rotation speed is fed and packed from the fan motor 5 to the main control circuit, and is returned according to the deviation between the rotation speed data of this signal and the previously set rotation speed data. Control is achieved.

Also, the combustion calculated above! - exceeds the capacity of the gas burner, a water flow valve control signal s9 is output from the main control circuit l, and the water flow valve 9 receives this signal.
Then, the hot water outlet 11 (is regulated) by narrowing down the hot water outlet.

In the combustion device as described in 14. As mentioned above, this is related to the improvement of the fan/motor feedback control section.

To explain with reference to FIG. 1, which shows an example of a circuit configuration when the fan motor control section (1) according to the present invention is realized by a group of individual circuit elements, from the seven control circuits (1), the above-mentioned Fan motor setting rotation speed data es corresponding to the air supply amount according to the calculated and determined combustion amount is sent from time to time. This data is in this case voltage dimension,
Thereafter, unless otherwise specified in 41+, other signal 1 data groups also take the following voltages.

-1- Fan/motor setting>i from control circuit l: Rotation speed data es is for detecting fan/motor rotation deviation amount.
It is added to the power of the differential amplifier 6o.

In addition to the input of the differential amplifier BO, a rotation speed-to-frequency conversion signal Sr5 from a known existing appropriate rotation speed detection sensor attached to the fan motor 5 is handled by a frequency-to-voltage converter or F/V converter 8o. It is converted into a voltage signal e11 and added. That is, em is a voltage corresponding to the fan motor rotation speed.

Therefore, the output of the differential amplifier 6o is set rotation speed data es and actual fan motor rotation speed data eI at that time.
The deviation amount (es-em) from l is detected and appears.

First, it is determined which deviation range this deviation amount signal (es-e+w) falls within. In this embodiment, the deviation range is an absolute value voltage range divided into four stages. In other words, if the range is the same in both the positive and negative directions, the amount of deviation (es-e
Regarding the absolute value 1es-e+wl of m), the cases are divided into the following four stages or ranges.
-em) are classified into seven levels.

-th deviation range ■... v3≦1es-eel second deviation range ■... v2≦1es-e fat l<V3゜third deviation range ■... v1≦1es-e wet l<V2゜th Four deviation range ■... 1es-a+ml <Vl.

1, since Vl<V2<V3, the fourth stage (■) is the lowest deviation range stage, that is, when the actual rotation speed of the fan motor is closest to the set rotation shell, and the first stage (■) has the largest deviation. This is the maximum deviation range.

This deviation range determination is performed by comparator arrays 41 to 46 from #1 to #116. In this embodiment, the deviation amount (es-em) is individually monitored by each pair of comparators 41, 42; 43, 44; 45, 4B depending on whether it is positive or negative.

That is, the deviation amount signal (es-em) is transmitted from all comparators 41 to
46, and on the other hand, voltage values v1 to V3 .
and -v1 to -v3 are allocated to one of the positive phase input or non-inverting input Φ of the six comparators.

Then, the voltage value V3. -Moon regarding V3 1. ! l-11
The outputs of comparators 41. - Comparators 43 and 44 of Kazu 3 and Kumo 4 regarding V2 are exclusive OR circuit 3 of #2
2, the voltage value V1. The comparators 45 and 46 of the cloud 5 and the cloud 6 regarding -Vl are exclusive OR circuits 33 of the cloud 3, and are configured to perform exclusive OR, respectively.

Also, the output of cloud exclusive OR circuit 31”
l The output of the cloud 2 exclusive OR circuit 32 is connected to the control terminal C of the 1 adder 12.
The outputs of the 113 exclusive OR circuit 33 are connected to the control terminal C of the 113 adder 13, and the outputs of the exclusive OR circuit 33 regarding the smallest voltage values Vl and -Vl are connected to the inverter. It is also connected to the control terminal C of the adder 14 of the key 4 via 9o.

Each adder has an augend signal input eil and an addition signal input eil, respectively.
i2, and in this case, when logic "L" is applied to the control terminal C, it becomes an addition mode, adds both input signals, and outputs a 1〆I signal such that eo=eilIei2 to the output eo. .

However, when the logic "H" is applied to the control terminal C, the signal input to be added becomes the pass mode -C, & the addition manual eil
appears as is at the output eo, and eo=eil.

The deviation amount from the output of the differential amplifier 6o (
es-em) is further input to amplifier arrays 21 to 23 from Ill to s3, and each amplifier 21 to 23 has an appropriate gain of 1 to 3. The output of the amplifier 21 has a voltage value t) of Kl (es-em), and the output of the s2 amplifier 22 has a voltage value t) of 2(es-em).
), and a voltage signal of 3 (es-em) appears at the output of the I+3 amplifier 23, and these are applied to the addition signals ei2 of the adders 11 to 13 from sl to ++3 described above.

Here, in this embodiment, the gains of 1 to 3 are set for each 119 width amplifier alone or in a selected combination to form a corresponding correction coefficient. In the following explanation, it is assumed that the correction coefficient is a gain constant of the control system.

With the L-notation configuration, each comparator output and each adder are determined depending on which of the deviation ranges ■ to ■ the deviation amount signal (es-em) appearing at the output of the differential amplifier 6o falls in. The logical value relationship of the control terminal C is shown in Table 1 below.

As shown in Table 1 above, deviation! If: jer,
I! When Ill is v3≦l es − eml, that is, the deviation amount 1es as shown in the top and bottom rows of Table 1.
−+! If ml is at the maximum deviation +E negative, then t1
The logic of the control input terminal C of the adder 11 to the key 3 adder 13 becomes "L", and all of them are placed in the addition mode.

Therefore, the output eo of the #3 adder 13 contains eo=es+
(es-em) (Kl+ to 2+ to 3) , , , , ,
(1) Corrected rotation speed data corresponding to the maximum correction amount appears.

In addition, in the case of the moderate second deviation amount range (■), the +12 adder 12 and the t3 adder 13 are placed in the addition mode -1 mode 1', and the #1 adder 11 is placed in the addend signal manually -1. Therefore, the output eo of the #3 adder 13 is.

eo = es+ (es-era) (3 to K2+),,,
,,, (2), and similarly, in the case of the third deviation amount range ■, only the I+3 adder 13 is in the addition mode, so its output eO is: eo = es + (es - em) ・K3 ,,
, , (3).

When the deviation amount is within the first to third deviation range, the s4 adder 14 is in the non-addition mode, and therefore the output eo of the 1 adder 13 is at a voltage convenient for performing the previous calculations. A data converter 5 converts the range into a signal in a voltage range convenient for actually controlling the fan motor.
0, the target rotation speed data St is passed through the 114 adder 14 in the non-addition mode, and is sent to the fan motor drive circuit 70, which outputs it as the fan motor rotation control signal Sc5. and controls the rotation of the fan-motor 5 to a predetermined rotation speed.

On the other hand, when the deviation amount 1es-eIIt is in the lowest deviation amount range ■ as shown in the middle row of Table 1, Ill
Adders 11 to 13 from I+3 are all placed in non-addition mode F, and instead, the logic signal obtained by inverting the logic signal to the control terminal of adder 13 #3 by inverter 90 is sent to its RJIm terminal C. Only the receiving #4 adder 14 performs the addition operation, eo=es+(es-em), , ,
, , (4) The target rotation speed data St is given to the fan motor drive circuit 70.

In this way, if there is a deviation between the fan/motor set rotation speed data es and the actual fan/motor 5 rotation speed data em, the circuit system shown in the figure is configured to perform appropriate processing according to the magnitude of the deviation. one? We can multiply by the complement 11 of llI j'lhk. Of course, the specific values of the gains that can be applied to each of the amplifiers 21 to 23 are 1 to 3 depending on the purpose.

Further, the number of deviation amount ranges is also a design matter, and can be handled using the same concept as the configuration shown in the first diagram. The data converter 50 is installed at the first position (in Δ, as shown by the arrow A, set rotation speed data es from the main MI control I11 path 1 is +11 in front of the human power of the adder 11). Change the part that converts r to an appropriate voltage value range, and connect the line B of the 0 somolar line.
Add 63 as shown in 7. q + 3 output n4 addition q
The augend signal eil of the device 14 corresponds to the human input signal, and τ is also good.゛(Using Do・1l−(Microphone 1bu・Ko〉・Hi) An overnight trip, river trip−(can also be realized.If you do it like that, you can do something like the one shown in Figure 2. It is possible to follow the flow chart.

In this case, there are three main routines:
It consists of a routine, a fan/motor rotation speed capture routine, and a fan/motor rotation control routine.
The computer processes each routine in a time-sharing manner.

In the main routine, the amount of combustion is determined from the amount of water and each temperature information group described above, the rotation speed of the fan-motor is calculated according to the amount of combustion, and this is stored in the register labeled (SETPPM). Store.

This operation is repeated to update the contents of (SETPPM).

The fan motor rotation speed acquisition routine uses f of the rotation speed signal pulse from the sensor that detects the fan motor rotation speed.
The program executes the program every time it detects a single error or a falling error, and increments the contents of the L/register indicated by FMCNTR by "I".

Fan/motor rotation speed control Lunano uses the above (
FMCNTR) register contents as label (FANRPM)
After transferring to the register indicated by
) The register contents are set to "0pa." At the same time, the difference between the contents of the above (SETRPM) register and (FANPPM) register, which contain the set rotation speed data at each time, is calculated, and the deviation amount data is set to the label (DIFPPM). ) is stored in the register indicated by .

As a result, if the contents of this (DIFRPM)
Therefore, of course, this routine ends.

On the other hand, if the content of the (DIFPPM) register is a significant value other than °゛()゛, the case is divided according to its absolute value (i.e., it is determined which deviation X falls within the range). ), change the method of calculating the output data to the fan motor drive circuit.

For example, the contents of the ([) IFPPM) register are α″J:
In the case of a small deviation, the previous output data is subjected to a small correction and then output.

If the contents of the (DIFRPM) register are smaller than the above-mentioned “β” that is entered from “6α゛′,” the value corresponding to the contents of the (DIFRPM) register, for example, the corresponding (IFPPM)
The value obtained by multiplying the contents of the register by 1.5 is used as the correction data, and
This is stored in the register labeled (GOIIPEN).

In the case of acceleration control, the contents of the (COMPEN) register and the contents of the (SETPPM) register are added to obtain target rotation speed data, and this is stored in the register indicated by the label (TARRPM). (COMPEN) from the contents of the (SETRPM) register.
) The contents of the register are subtracted and stored in the (TARRPM) register. At this time, the determination as to whether the control is acceleration control or deceleration control is based on the positive or negative polarity of the contents of the ([lIFPPM) register.

The above operation is divided into predetermined cases, for example, β≦IDI
FRPMI <γ09000. η≦l[1IFRPII
Il<θ.

I D IFRPMI ≧θ ,,,,
, , , (5) is performed to obtain each (TARRPM), convert this into control voltage data (OUTIIAT) convenient for fan motor control, and output it to the fan motor drive circuit.

[■0 Effects of the Invention] As described above, according to the present invention, it is possible to perform the optimum tll correction depending on the magnitude of the rotational speed deviation of the engine. Good fan/motor rotation control is possible in the entire IJ deviation range, the amount of air corresponding to the amount of combustion can be supplied with high precision, the combustion efficiency can be increased, and the risk of harmful exhaust gas being released can be avoided.

In addition, the control system response curve is adjusted according to the amount of deviation, and the fall can be maintained at an optimum level, so that tracking performance is improved and hunting can be minimized.

[Brief explanation of drawings]

Fig. 1 is a circuit configuration diagram of an example of a device for carrying out the method of the present invention, Fig. 2 is an explanatory diagram of an embodiment in which 1 is expressed as a noro chart for those who have not yet invented the invention, and Fig. 3 is a diagram of the present invention. 1 is an explanatory diagram of an outline of a combustion device to which the invention can be applied; FIG. In the figure, 1 is the main control circuit, 2 is the heat converter, 3 is the gas
4 is a gas proportional valve, 5 is a fan motor,
6 is a water flow sensor, 7 is a water supply temperature sensor, 8 is a hot water temperature sensor, 1O is the entire control circuit system in the apparatus implementing the method of the present invention, 11 to 14 are adders, 21 to 23 are amplifiers, 31 to 32 is an exclusive OR circuit, 41~
46 is a comparator, 50 is a data converter, 60 is a differential amplifier, 7o is a fan/motor drive circuit, 80 is a frequency-to-voltage converter, and 90 is an inverter.

Claims (1)

[Scope of Claims] A fan/motor control method in a combustion control device in which the rotational speed of a fan/motor for feeding an amount of air corresponding to the amount of combustion to a combustion section is controlled by a feedback control system, the method comprising: a set rotation; Detects the amount of deviation between the number and the actual fan motor rotation speed; Determines which deviation range the detected deviation falls into; Selects a predetermined correction coefficient corresponding to the determined deviation range calculating target rotation speed data based on the selected correction coefficient and the set rotation speed; and supplying the calculated target rotation speed data to the fan motor as a fan motor rotation control signal. A method for controlling a fan motor in a combustion control device.