JP3355891B2 - Combustion 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 a combustion control device used for a hot oil heater or the like.

[0002]

2. Description of the Related Art Conventionally, this type of oil heater is configured as shown in FIG. That is, in FIG.
Is a room temperature detecting means for detecting the temperature in the heated room.
Is a temperature setting means for setting a desired temperature. Reference numeral 3 denotes a combustion amount control unit that switches the combustion amount to a plurality of stages according to the difference between the room temperature detection unit 1 and the temperature setting unit 2.

For example, when the set temperature is 20 ° C., the combustion amount is switched to weak combustion if the room temperature is 21 ° C. and to strong combustion if the room temperature is 18 ° C. The combustion section 5 is controlled by the combustion control means 4 based on the output of the combustion amount control means 3 and the like.

[0004]

However, according to the above-mentioned conventional configuration, when the resolution accuracy of the room temperature thermistor is low, for example, in the case of a room temperature thermistor which can be detected only in 0.5 ° C. increments, strong combustion to weak combustion Even if the number of combustion stages is 256 during this period, the number of combustion stages (stages at which combustion can be stabilized) actually determined by the room temperature and the set temperature is 6
You can only have steps. In this case, the following phenomena may occur.

[0005] If the combustion is continued at a certain amount of combustion, the room temperature rises. Therefore, the amount of combustion is switched to one step lower. Therefore, if the combustion is continued with a relatively small amount of combustion, the room temperature will decrease this time, and the amount of combustion must be switched to one step higher. Then, if you continue burning with a strong combustion amount, the room temperature will rise this time,
It may be repeated that the amount of combustion must be switched one step lower.

When the above phenomenon occurs, the room temperature may not be stable at the set temperature for a long time, and the room temperature may change greatly and the state may be unpleasant. Further, the number of revolutions of the fan motor is also disturbed in accordance with the switching of the combustion amount, so that there is a disadvantage that the fan motor is noisy. In order to avoid this, if a room temperature thermistor having higher resolution accuracy is used, the number of stages in which combustion can be stabilized can be increased, but there is a disadvantage that the cost is increased.

The present invention solves the above-mentioned disadvantages, and increases the number of stages in which combustion can be stabilized without increasing the cost.
By determining the optimal amount of combustion for that room,
The purpose of the present invention is to eliminate fluctuations in the amount of combustion and provide comfortable room temperature stability.

[0008]

According to the present invention, in order to achieve the above object, in the first invention, the combustion amount determined by the combustion amount control means is burned within a predetermined combustion amount range. A stable combustion detection means for detecting that the stable combustion is detected by the stable combustion detection means, and a stability confirmation timer for measuring a period during which the stable combustion is continued, and a combustion amount per unit time during the stable combustion period. A stable combustion storage means for storing, an average combustion amount calculating means for calculating an average combustion amount during stable combustion based on information of the stable combustion storage means when the stability confirmation timer elapses a preset time; After inputting the calculation result of the average combustion amount from the combustion amount calculation means, the combustion is continued until the combustion amount determined by the combustion amount control means exceeds a preset combustion amount range. It is provided with a combustion quantity switching means for switching the average combustion amount.

In the second invention, the above object is achieved and, at the same time, an improvement is provided. An average combustion amount range calculating means for calculating an average combustion amount range including the average combustion amount is provided. Means for switching the combustion amount to the lower limit of the average combustion amount range.

[0010]

According to the present invention, in the first aspect of the present invention, when the stability confirmation timer elapses a predetermined time, the average combustion amount during stable combustion is calculated and the combustion amount is forcibly reduced to the average combustion amount. Since the switching is performed, the combustion amount does not fluctuate indefinitely between the number of combustion stages, and the optimum combustion amount for the room is determined. Further, in the second invention, in addition to the first invention, the combustion amount during stable combustion is always equal to or less than the average combustion amount.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals and the description thereof will be omitted, and different parts will be described.

In the first invention, in FIG. 1, reference numeral 6 denotes a stable combustion detecting means for detecting that the combustion amount determined by the combustion amount control means 3 is burning within a preset combustion amount range. 7 is the stable combustion detecting means 6
Is a stability confirmation timer for measuring a period during which stable combustion is detected, and 8 is a stable combustion storage means for storing a combustion amount per unit time during the stable combustion period, and 9 is a stability confirmation timer. When a predetermined time elapses, the average combustion amount calculation means for calculating the average combustion amount during stable combustion based on the information in the stable combustion storage means 8
Reference numeral 10 denotes a combustion amount determined by the combustion amount control unit 3 after the calculation result of the average combustion amount from the average combustion amount calculation unit 9 is input, and a combustion amount range when the average combustion amount is calculated. This is a combustion amount switching means for switching the combustion amount to the average combustion amount until it exceeds. This combustion amount switching means 1
The combustion control unit 4 controls the combustion unit 5 based on 0 or the output of the combustion amount control unit 3.

Next, the operation of the embodiment constructed as described above will be described with reference to the flowchart of FIG. In FIG. 2, first, at step 20, the combustion amount (hereinafter, referred to as the current combustion amount) is calculated by the combustion amount control means 3 based on the output signals of the room temperature detecting means 1 and the temperature setting means 2. Next, step 21
The stable combustion detection means 6 determines whether the current combustion amount is within a preset combustion amount range. If it is out of the range, the stability confirmation timer 7 is reset in step 27 and the process proceeds to step 28. If it is within the combustion amount range, the stability confirmation timer overflows (hereinafter referred to as OVF) in step 22.
It is determined whether or not OVF is performed, and if not, the process proceeds to step S23. If the OVF has been performed, the average combustion amount during the stable combustion period is calculated by the average combustion amount calculating means 9 in step 25 based on the information in the stable combustion storage means 8. In order to control with the average combustion amount calculated in step 25, the combustion amount is switched by the combustion amount switching means 10 and the process proceeds to step.

Next, at step 23, the stability confirmation timer 7 is counted, and at step 24, the stable combustion storage means 8 stores the amount of combustion per unit time during the stable combustion period. Next, at step 28, combustion is controlled by the combustion control means based on the current combustion amount or the average combustion amount.

The following operation will be described as a specific example with reference to the flowcharts of FIGS.

First, as an example, when the number of combustion stages is 256 from the strong combustion to the weak combustion, and the number of combustion stages determined by the room temperature and the set temperature (the number of stages in which combustion can be stabilized) is 6, the preset combustion is performed. The case where the amount range is in the range from the second stage to the third stage among the six stages will be described. In this case, the second stage is referred to as an upper limit combustion amount, and the third stage is referred to as a lower limit combustion amount.

In the first invention, in FIGS. 3 and 4, first, at step 30, the combustion amount (hereinafter referred to as the current combustion amount) is controlled by the combustion amount control means 3 based on the output signals of the room temperature detecting means 1 and the temperature setting means 2. ) Is calculated. Next, in step 31, the current combustion amount and the upper limit combustion amount are compared. Based on the result of this comparison, it is detected whether stable combustion is occurring.

In the case of "current combustion amount> upper limit combustion amount", it is determined that there is no current combustion amount within the combustion amount of the second to third stages,
In step 32, the current combustion amount itself is set as a new upper limit combustion amount, and in step 33, the new combustion amount in two stages (for example, when the current combustion amount is the first stage, the first stage is subjected to the upper limit combustion amount). Amount, the second stage is the lower limit combustion amount), and the stability confirmation timer 7 is started for a predetermined time to confirm whether the combustion amount is stable or not. At this time, since “current combustion amount = upper limit combustion amount”, the upper limit combustion amount holding timer for counting the time during which combustion is performed at the upper limit combustion amount is started in step 34, and the process proceeds to step 46.

In step 31, "current combustion amount≤upper limit combustion amount"
When it is determined that the current combustion amount is included in the second to third stage combustion amounts in step 35, if not, a new upper limit combustion amount is set in step 36. ,
In step 37, within the new two-stage combustion amount (for example, if the current combustion amount is the fifth stage, the fourth stage is set to the upper limit combustion amount,
A stability confirmation timer 7 for confirming whether or not the combustion amount is stable for a predetermined time in two stages where the stage is the lower limit combustion amount)
Start. Further, at step 38, the upper limit combustion amount holding timer is reset, and the routine proceeds to step 46.

If it is determined in step 35 that the current combustion amount is included in the second to third stage combustion amounts, step 39
Then, the counting of the upper limit combustion amount holding timer is stopped, and it is determined in step 40 whether or not the stability confirmation timer 7 overflows. If an overflow has occurred, the flow proceeds to step 44, and if not, the flow proceeds to step 46.

In step 31, "current combustion amount = upper limit combustion amount"
If it is determined that the stability confirmation timer 7 has overflown in step 41, the timer counts up the upper limit combustion amount holding timer in step 42 if it has not overflown, and proceeds to step 46. If the timer has overflown, the counting of the upper limit combustion amount holding timer is stopped in step 43, and the time ratio between the stability confirmation timer 7 and the upper limit combustion amount holding timer is calculated in step 44 by the calculation unit 12 (average combustion during the stable period). Seeking the amount).

Next, for example, a case where the stability is continued within the combustion amount of the second to third stages and the stability confirmation timer 7 overflows will be described.

In FIG. 4, in step 45, for example, when the calculation result is “upper limit combustion amount holding timer <stability confirmation timer × １ ／”, the current combustion amount is set to the second stage during a predetermined stability confirmation time. Out of the third-stage combustion amount, it is determined that the combustion amount is almost the third-stage combustion amount.
At 0, the third stage combustion amount is set as a new combustion amount. If "upper limit combustion amount holding timer <stability confirmation timer x 2 /
In the case of "4", the combustion ratio switching means 10 sets a new combustion amount as "(second stage + third stage) .times.3" based on the time ratio.
/ 4 "is set. If “upper limit combustion amount holding timer <stability confirmation timer × 3/4”, the combustion amount switching means 10 sets a new combustion amount based on the time ratio as “(second stage + third stage) × 2/4”. Is set. If “upper limit combustion amount holding timer <stability confirmation timer × 4/4”, the combustion ratio switching unit 10 sets a new combustion amount based on the time ratio as “(second stage + third stage) × 1/4”. Is set. If “upper limit combustion amount holding timer = stability confirmation timer × 4/4”, it is determined that the current combustion amount has always been the second stage combustion amount, and the combustion amount switching means 10 sets a new combustion amount as 2 Set the combustion amount of the stage.

Next, at step 46, combustion is controlled by the combustion control means 4 based on the combustion amount set by the combustion amount control means 3 or the combustion amount switching means 10.

According to the first embodiment, even when the combustion amounts of the second and third stages are repeated, the average combustion amount during the stable period is obtained when the stability confirmation timer overflows. 1. Not only the second and third stages, but also the number of combustion stages that could not be stabilized by the conventional configuration.
Since the combustion amount is switched to any of the 25th stage, the 2.5th stage, and the 2.75th stage and stable combustion can be performed, it can be said that the number of stages in which combustion can be stabilized has increased. As a result, the combustion amount does not fluctuate indefinitely, and the combustion amount obtained by dividing the second to third stages into four equal parts can be newly determined, so that the optimum combustion amount can be selected.

However, in the case of the first embodiment, "determining whether or not the current combustion amount is included in the second to third stage combustion amounts" is used as the stable combustion detection means. Even if the set temperature is changed, the combustion amount is switched and exceeds the combustion amount range of the second stage to the third stage. Therefore, even if "change of the set temperature" is used as the stable combustion detection means, the same as above. The effect is obtained.

Next, an embodiment of the second invention will be described with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals and the description thereof will be omitted, and different parts will be described.

In FIG. 5, in addition to FIG. 1, 11 is an average combustion amount range calculating means for calculating an average combustion amount range including the average combustion amount, and 10 is a combustion amount for switching the combustion amount to the lower limit of the average combustion amount range. Switching means.

Next, the operation of the present embodiment configured as described above will be described with reference to the flowchart of FIG.

In FIG. 6, in addition to FIG.
If the stability confirmation timer overflows in step 25, the average combustion amount during stable combustion is calculated in step 25, and the average combustion amount range including the average combustion amount is calculated in step 251 by the average combustion amount range calculating means 11. Then, in step 26, the combustion amount is switched to the lower limit of the average combustion amount range obtained in step 251.

Next, the following will be described as a specific embodiment of the second invention. 7 and 8, in addition to FIG. 3, when the average combustion amount of the second stage and the third stage is calculated in step 45, it is assumed that the average combustion amount is 2.5 stage. In that case, FIG.
In step 451, the average combustion amount range calculating means 11
The average combustion amount range from, for example, the 2.25th stage to 2.7.
If the fifth stage is calculated, a new combustion amount of 2.75 is set in step 452.

According to the second embodiment, when the combustion amount is stable, even if the average combustion amount is calculated as the 2.5th stage, the 2.75th stage which is slightly smaller than the 2.5th stage is forcibly forced. Since it is set as a new combustion amount, an energy saving effect can be expected.

[0033]

As described above, according to the combustion control device of the present invention, the number of combustion stages that can be stabilized without increasing the cost can be increased according to the first invention, and the optimum combustion amount for the room is determined. So that there is no fluctuation in the amount of combustion. Further, the rotation speed of the fan motor is not disturbed accordingly.

In the second invention, in addition to the first invention, since the combustion amount is set to be slightly lower during stable combustion, an energy saving effect can be expected.

[Brief description of the drawings]

FIG. 1 is a block diagram of a combustion control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a combustion control device according to the first embodiment of the present invention.

FIG. 3 is a specific flowchart of the combustion control device according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a continuation of the flowchart of FIG. 3;

FIG. 5 is a block diagram of a combustion control device according to another invention.

FIG. 6 is a flowchart of a combustion control device according to another invention.

FIG. 7 is a specific flowchart of a combustion control device according to another invention.

FIG. 8 is a flowchart showing a continuation of the flowchart of FIG. 7;

FIG. 9 is a block diagram showing a conventional hot air heater control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Room temperature detection means 2 Temperature setting means 3 Combustion amount control means 4 Combustion control means 5 Combustion unit 6 Stable combustion detection means 7 Stability confirmation timer 8 Stable combustion storage means 9 Average combustion amount calculation means 10 Combustion amount switching means 11 Average combustion amount range Calculation means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Hikaru 1-123054 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/20 F23N 5/12

Claims (2)

(57) [Claims] 1. A combustion section for burning fuel, room temperature detecting means for detecting a room temperature, a temperature setting means for setting a desired temperature, a room temperature detected by the room temperature detecting means, A combustion amount control means for switching a combustion amount to a plurality of stages by using a difference from a preset temperature as an input signal; and a combustion amount determined by the combustion amount control means, wherein the combustion amount is within a preset combustion amount range ( (Hereinafter referred to as stable combustion) stable combustion detection means for detecting that stable combustion is detected, a stability confirmation timer for measuring a period during which stable combustion is detected by the stable combustion detection means, The stable combustion storage means for storing the amount of combustion per unit time during the period, and the information of the stable combustion storage means when the stability confirmation timer elapses a preset time. The average combustion amount calculation means for calculating the average combustion amount during stable combustion, and the average combustion amount calculation result from the average combustion amount calculation means are input, and then the combustion amount determined by the combustion amount control means Combustion amount switching means for switching the combustion amount to the average combustion amount until the combustion amount exceeds a preset combustion amount range, and combustion control for controlling the combustion amount of the burner according to the combustion amount switched and inputted by the combustion amount switching means. And a combustion control device. 2. A combustion section for burning fuel, a room temperature detecting means for detecting a room temperature, a temperature setting means for setting a desired temperature, a room temperature detected by the room temperature detecting means, A combustion amount control means for switching a combustion amount to a plurality of stages by using a difference from a preset temperature as an input signal; and a combustion amount determined by the combustion amount control means, wherein the combustion amount is within a preset combustion amount range ( (Hereinafter referred to as stable combustion) stable combustion detection means for detecting that stable combustion is detected, a stability confirmation timer for measuring a period during which stable combustion is detected by the stable combustion detection means, The stable combustion storage means for storing the amount of combustion per unit time during the period, and the information of the stable combustion storage means when the stability confirmation timer elapses a preset time. Mean combustion amount calculating means for calculating the average combustion amount during stable combustion, average combustion amount range calculating means for calculating the average combustion amount range including the average combustion amount, the combustion amount is the lower limit of the average combustion amount range And a combustion control means for controlling the combustion amount of the burner according to the combustion amount switched and inputted by the combustion amount switching means.