JPH0996418A - Combustion control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reset an optimum combustion rate to a room without increasing cost and eliminate variations in the combustion rate in the case of a degraded accuracy of the resolution of a room temperature thermistor, if the amount of combustion is unsteady for a definite time within some range of the combustion rate. SOLUTION: A combustion control device is designed to store a combustion rate per unit time with a stable combustion memory means 8 if combustion stability is confirmed with a stable combustion detection means 6 and to compute the average combustion rate during stable combustion with an average combustion rate computation means at the point of time when a preliminarily determined stability confirmation timer 7 overflows and to switch over the combustion rate of the average combustion rate by a combustion rate switchover means 10 from the combustion rate determined with a combustion rate control means 3 based on a room temperature and a setting temperature, thereby forming the structure of increased combustion steps and an appropriate combustion rate can be decided to eliminate the fluctuation.

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 in a petroleum hot air heater or the like.

[0002]

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

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

[0004]

However, according to the above-mentioned conventional configuration, when the resolution of the room temperature thermistor is low, for example, in the case of the room temperature thermistor that can detect only at intervals of 0.5 ° C., strong combustion to weak combustion is performed. Even if the number of combustion stages is 256, the number of combustion stages (the number of stages that can stabilize combustion) is actually determined by the room temperature and the set temperature.
You can only have steps. In this case, the following phenomenon may occur.

If the combustion is continued with a certain amount of combustion, the room temperature rises, so the amount of combustion is switched to a slightly lower level. Therefore, if the combustion is continued with a weaker combustion amount, the room temperature is lowered this time, and the combustion amount must be switched to the one step higher. So if you continue burning with a strong burning amount, the room temperature will rise this time,
Sometimes, the amount of combustion has to be switched to a lower level by one step.

When the above phenomenon occurs, the room temperature may not stabilize at the set temperature forever, and the room temperature may change greatly and become uncomfortable. Further, the number of revolutions of the fan motor is also disturbed according to the switching of the combustion amount, which is a drawback of being noisy. In order to avoid this, if a room temperature thermistor having a 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 drawbacks by increasing 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 is to eliminate fluctuations in the amount of combustion and to provide comfortable room temperature stability.

[0008]

In order to achieve the above object, the present invention provides, in the first invention, that the combustion amount determined by the combustion amount control means is burned within a preset combustion amount range. Stable combustion detection means for detecting that the stable combustion is detected, a stability confirmation timer for measuring the period during which the stable combustion detected by the stable combustion detection means continues, and the combustion amount per unit time during the stable combustion period. Stable combustion storage means for storing, and when the stability confirmation timer has passed a preset time, an average combustion amount calculation means for calculating an average combustion amount during stable combustion based on information in the stable combustion storage means, and an average After inputting the calculation result of the average combustion amount from the combustion amount calculation means, until the combustion amount determined by the combustion amount control means exceeds the 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 added, and an average combustion amount range calculating means for calculating an average combustion amount range including the average combustion amount is provided, and the first invention is provided. The combustion amount switching means for switching the combustion amount to the lower limit value of the average combustion amount range.

[0010]

According to the present invention, according to the above-mentioned configuration, in the first invention, when the preset time for the stability confirmation timer elapses, the average combustion amount during stable combustion is calculated and the combustion amount is forced to the average combustion amount. Because of the switching, the combustion amount does not fluctuate between a certain number of combustion stages indefinitely, and the optimum combustion amount for the room is determined. In addition, in the second invention, in addition to the first invention, the amount of combustion during stable combustion is always less than or equal to the average amount of combustion.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those of 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, 6 is a stable combustion detection means for detecting that the combustion amount determined by the combustion amount control means 3 is burning within a preset combustion amount range. And 7 is the stable combustion detection means 6
Is a stability confirmation timer for measuring a period during which stable combustion is detected, 8 is stable combustion storage means for storing a combustion amount per unit time during the stable combustion period, and 9 is the stability confirmation timer After a preset time of 7, 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 the combustion amount range when the average combustion amount is calculated, when the 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. It is a combustion amount switching means for switching the combustion amount to the average combustion amount until the combustion amount is exceeded. 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 this embodiment configured as described above will be described with reference to the flowchart of FIG. In FIG. 2, first, in step 20, the combustion amount control unit 3 calculates the combustion amount (hereinafter referred to as the current combustion amount) based on the output signals of the room temperature detection unit 1 and the temperature setting unit 2. Next, step 21
Then, the stable combustion detecting means 6 judges whether the present 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 in step 22 (hereinafter referred to as OVF).
It is determined whether or not OVF is performed, and if not, the process proceeds to step 23. If it is OVF, the average combustion amount calculation means 9 calculates the average combustion amount during the stable combustion period based on the information in the stable combustion storage means 8 in step 25, and in step 26, the average combustion amount is not the current combustion amount thereafter. In order to control the average combustion amount calculated in step 25, the combustion amount switching means 10 switches the combustion amount to step 28.

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

As a concrete example of the above, the following operation will be described with reference to the flowcharts of FIGS.

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

In the first invention, in FIG. 3 and FIG. 4, first, at step 30, the combustion amount is controlled by the combustion amount control means 3 in accordance with the output signals of the room temperature detection means 1 and the temperature setting means 2 (hereinafter referred to as the present combustion amount). ) Is calculated. Next, at 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 or not stable combustion is occurring.

In the case of "current combustion amount> upper limit combustion amount", it is judged that there is no current combustion amount within the combustion amounts 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, within the new two-stage combustion amount (for example, if the current combustion amount is the first stage, the first stage is set as the upper limit combustion amount). The stability confirmation timer 7 is started in order to confirm whether or not the combustion amount is stable for a predetermined time in the second amount (the second stage is the lower limit combustion amount). At this point in time, "current combustion amount = upper limit combustion amount", so in step 34 an upper limit combustion amount holding timer for counting the time of combustion at the upper limit combustion amount is started, and the routine proceeds to step 46.

In step 31, "current combustion amount ≦ upper limit combustion amount"
If it is determined that the current combustion amount is included in the combustion amounts of the second to third stages in step 35, and if it is not included, 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 the upper limit combustion amount, 5
The stability confirmation timer 7 is used to confirm whether or not the combustion amount is stable for a predetermined time in two stages with the lower limit combustion amount at the second stage.
To start. Further, in step 38, the upper limit combustion amount holding timer is reset, and the process proceeds to step 46.

If it is determined in step 35 that the current combustion amount is included in the combustion amounts of the second to third stages, step 39
Then, the count 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 has overflowed. If it has overflowed, go to step 44, and if it has not overflowed, go to step 46.

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

Next, a case will be described in which, for example, the stability is maintained within the combustion amounts of the second to third stages and the stability confirmation timer 7 overflows.

In step 45 in FIG. 4, for example, when the calculation result is "upper limit combustion amount holding timer <stability confirmation timer x 1/4", the current combustion amount is in the second stage during a predetermined stability confirmation time. And the combustion amount of the third stage, it is judged that the combustion amount is almost the third stage, and the combustion amount switching means 1
When 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 /
4 ”, the combustion amount switching means 10 sets a new combustion amount based on the time ratio,“ (second stage + third stage) × 3 ”.
/ 4 ”combustion amount is set. If "upper limit combustion amount holding timer <stability confirmation timer x 3/4", the new combustion amount is calculated by the combustion amount switching means 10 based on the time ratio, "(second stage + third stage) x 2/4". Set the amount of combustion. If "upper limit combustion amount holding timer <stability confirmation timer x 4/4", the new combustion amount is calculated by the combustion amount switching means 10 based on the time ratio, "(second stage + third stage) x 1/4". Set the amount of combustion. 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 to 2 Set the amount of combustion in the first stage.

Next, at step 46, the combustion control means 4 controls combustion based on the combustion quantity set by the combustion quantity control means 3 or the combustion quantity switching means 10.

According to the first embodiment described above, even when the combustion amounts of the second and third stages are repeated, the average combustion amount during the stable period is calculated when the stability confirmation timer overflows. The number of combustion stages that could never be stabilized by the conventional configuration as well as the second and third stages 2.
It can be said that the number of stages in which combustion can be stabilized has increased because the combustion amount can be switched to the 25th stage, the 2.5th stage, or the 2.75th stage to perform stable combustion. As a result, the combustion amount does not fluctuate forever, 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, "determination as to whether or not the current combustion amount is included in the combustion amounts of the second stage to the third stage" is used as the stable combustion detecting means. Even if the set temperature is changed, the combustion amount switches and exceeds the combustion amount range from the second stage to the third stage. Therefore, even if "change of 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 of the conventional example are denoted by the same reference numerals and the description thereof will be omitted, and different parts will be described.

5, in addition to FIG. 1, 11 is an average combustion amount range calculation 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. It is a switching means.

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

In FIG. 6, in addition to FIG. 2, step 22
If the stability confirmation timer overflows at step 25, the average combustion amount during stable combustion is calculated at step 25, and the average combustion amount range calculation means 11 calculates the average combustion amount range including the average combustion amount at step 251. 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 combustion amounts of the second stage and the third stage is calculated in step 45, it is assumed that it is the 2.5th stage. In that case, FIG.
In addition to the above, in step 451 the average combustion amount range calculation means 11
The average combustion amount range is, for example, from the 2.25th stage to 2.7.
When it is calculated as the fifth stage, in step 452, the second combustion amount is set to the 2.75th stage.

According to the second embodiment, when the combustion amount is stable, even if the average combustion amount is calculated to be the 2.5th stage, the 2.75th stage, which is slightly smaller than that, is 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 first invention makes it possible to increase the number of stable combustion stages without increasing the cost and determine the optimum combustion amount for the room. Therefore, the fluctuation of the combustion amount is eliminated. In addition, the rotation speed of the fan motor is not disturbed accordingly.

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

[Brief description of 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.

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

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

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

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

FIG. 9 is a block diagram showing a conventional controller for a hot air heater.

[Explanation of symbols]

 1 Room Temperature Detection Means 2 Temperature Setting Means 3 Combustion Amount Control Means 4 Combustion Control Means 5 Combustion Section 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 Ranges Calculation means

Claims (2)

[Claims] 1. A combustion section for burning fuel, a room temperature detecting means for detecting a temperature in a room, a temperature setting means for setting a desired temperature, a room temperature detected by the room temperature detecting means, and a set temperature means. A combustion amount control means for switching the combustion amount to a plurality of stages by using a difference from a preset set temperature as an input signal, and a combustion amount determined by the combustion amount control means are burned within a preset combustion amount range ( (Hereinafter referred to as "stable combustion"), stable combustion detection means for detecting that stable combustion is occurring, a stability confirmation timer for measuring the duration of stable combustion detected by the stable combustion detection means, and the stable combustion Stable combustion storage means for storing the amount of combustion per unit time during the period, and when the stability confirmation timer has passed a preset time, the information in the stable combustion storage means is stored. In, the average combustion amount calculation means for calculating the average combustion amount during stable combustion, and after inputting the calculation result of the average combustion amount from the average combustion amount calculation means, the combustion amount determined by the combustion amount control means , A combustion amount switching means for switching the combustion amount to an average combustion amount until the combustion amount exceeds a preset combustion amount range, and a combustion control for controlling the combustion amount of the burner according to the combustion amount switched and input by the combustion amount switching means. Combustion control device comprising means. 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, and a set temperature means. A combustion amount control means for switching the combustion amount to a plurality of stages by using a difference from a preset set temperature as an input signal, and a combustion amount determined by the combustion amount control means are burned within a preset combustion amount range ( (Hereinafter referred to as "stable combustion"), stable combustion detection means for detecting that stable combustion is occurring, a stability confirmation timer for measuring the duration of stable combustion detected by the stable combustion detection means, and the stable combustion Stable combustion storage means for storing the amount of combustion per unit time during the period, and when the stability confirmation timer has passed a preset time, the information in the stable combustion storage means is stored. The average combustion amount calculation means for calculating the average combustion amount during stable combustion, the average combustion amount range calculation means for calculating the average combustion amount range including the average combustion amount, and the combustion amount for the lower limit value of the average combustion amount range. And a combustion control device for controlling the combustion amount of the burner according to the combustion amount switched and input by the combustion amount switching device.