JPS6021295B2 - Combustion control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the improvement of a control device for combustion equipment for oil, gas, etc., and more specifically, to maintain good combustion by controlling the combustion state, that is, the air-fuel ratio. This invention relates to a so-called air-fuel ratio control device.

Prior Art Conventionally, in this type of combustion control, as shown in the following conventional example, the amount of kerosene supplied by a pulse pump, which is a fuel supply means, and the amount of air supplied by a combustion blower are adjusted in advance, and a predetermined air-fuel ratio is achieved. I was trying to get it.

Hereinafter, examples of the prior art will be explained with reference to the drawings. Figure 1 shows
Schematic diagram of the forced intake/exhaust oil hot air heater for the subordinate, No. 2
The figure is its control circuit diagram.

In the figure, 1 is a case of a hot air fan, which includes an air supply and exhaust unit 2, a burner unit 3, a combustion tube 4, a heat exchanger 5,
It houses an oil tank 6, a control device 7, etc. Combustion air is supplied to fans 9 and 10 rotated by burner motor 8.
From this, air is taken in from the intake cylinder 11. Fuel (kerosene) is pumped up from the oil tank 6 at a predetermined flow rate by a pulse pump 11, and is pumped up through a fuel supply pipe 12.
It is supplied to the rotary plate 13 and atomized. In the vaporizer cylinder 14,
An internal sheathed heater 15 is embedded, and the vaporization cylinder is preheated to a temperature sufficient for vaporizing kerosene. Therefore, the kerosene that has been turned into diamond by the rotary plate 13 is vaporized by the vaporizing tube 14, mixed with a predetermined amount of air supplied by the fans 9 and 10, and sent to the combustion tube 4 from the burner head 16. An ignition electrode 17 is provided on the outlet side of the burner head 16, and ignition occurs here. Combustion gas passes through the heat exchanger 5 from the combustion tube 4 and is exhausted outdoors from the exhaust tube 18.

Reference numeral 20 denotes a combustion detection electrode (flame rod), which is used to detect ignition and misfire based on ion current depending on the presence or absence of a fire.

A burner thermoswitch 21 controls the supply of electricity to the vaporization heater 15.

A switch 22 drives the convection fan 23 to cause convection of indoor air when the temperature of the heat exchanger 5 reaches a predetermined temperature.

The hot air fan control device 7 is constituted by a control circuit shown in FIG. In FIG. 2, 24 and 25 are commercial power supply terminals.

When the operation switch 26 is turned on, the operation lamp 27 lights up and the vaporization heater 15 is energized. When the temperature of the vaporizer cylinder 14 rises to a predetermined temperature, the burner thermoswitch 21 is activated and the contact point is switched from 21a to 21b. and,
Relay 28 is energized and its contact 28a closes, relay 2
8 is self-retaining. At the same time, the power transformer 29 is exposed. The room temperature (or suction air temperature) is detected by a load temperature detector (thermistor) 301, and when the temperature is at which heating is required, the electronic control unit 31 closes the relay contact 32, the burner motor 8 is energized, and the prebarge is activated. will be started. After prebarging for a certain period of time, the relay contacts 33 and 34 are closed, and the drive circuit 36 of the pulse pump 11 and the ignition device 37 are closed.
is energized and starts operating. When ignition is confirmed from the combustion detection electrode 2, the relay contact 34 is opened and the energization to the ignition device 37 is stopped.

When the room temperature (load temperature) rises and reaches the set temperature, the relay contacts 32 and 33 become connected and combustion stops.
When the room temperature drops again, the same ignition and combustion sequence as described above is executed. Note that 38, 39, and 35 are a current fuse, a thermal fuse, and a vibration fire extinguishing switch, respectively. Problems to be Solved by the Invention Conventionally, in order to maintain good combustion conditions, each component, particularly the pulse pump, was 11 and its drive circuit 36, and environmental characteristics such as temperature characteristics must be sufficiently controlled.

Generally, the combustion amount of a hot air fan is 3000 to 600 female cal/
Since the kerosene equivalent to this is extremely small at around 6 to 1 c/min, it is extremely difficult to manufacture a pump that can stably supply this small amount of kerosene with little variation. Met. Therefore, it is necessary to adjust the amount of kerosene supplied to the subordinate pulse pump, and the drive circuit thereof also needs to be stable, so adjustment, aging, etc. are required.

Even pumps manufactured using extremely fastidious production processes become even more unstable when supplied with a very small amount of kerosene (about 1,500 to 200 female cal/h), making it extremely difficult to realize a hot air fan with a low calorific value. It made it difficult.

Therefore, it is burned at a constant combustion rate, and the load temperature (room temperature) is
There was no choice but to use a so-called on-off control system, which stops combustion when the temperature rises.

In addition, as mentioned above, even if a pump manufactured through the adjustment aging process is used, the temperature of kerosene and the density of air will change due to changes in the environment such as ambient temperature, so it is necessary to adjust the combustion state (air-fuel ratio) to the desired level. It is extremely difficult to maintain
In particular, it has been difficult to realize low-volume supply. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has the following configuration.

That is, a combustion state detection means, a combustion state g reference signal generator, and at least one or more first thresholds for generating a threshold signal having a magnitude one predetermined level above or below the reference signal; a generator and a second threshold generator; combustion condition detection signal comparison means for comparing the combustion condition detection signal with said first and second threshold values and reference signals and decoding it into at least four levels; The combustion control section sends a fuel or air increase/decrease signal to the fuel supply amount means or combustion air adjustment means in accordance with the decoding result, and adjusts the amount of fuel or air supplied.

According to the above-described structure, the present invention decodes the combustion state detection signal into four or more levels centered around the reference signal, determines the difference between the reference signal and the detection signal, and determines the difference between the reference signal and the detection signal. A unique medical device increases or decreases the amount of fuel or air supplied to control the detection signal so that it always approaches the reference signal,
It functions to maintain good combustion conditions.

In addition, with the configuration in which the above-described determination is made by decoding and the amount of fuel or air is increased or decreased according to the result,
When the detection signal deviates significantly from the reference signal, the amount of increase or decrease in fuel can be increased to quickly achieve a good combustion state. Embodiment FIG. 3 is a block diagram showing an embodiment of the present invention.

In the figure, A is a heating room in which a hot air fan 1 is placed. The temperature of the air sucked into the warm air fan 1 is sent from a room temperature detector (thermistor) 30 to an amplifier 40. On the other hand, 41 is a temperature setter, and the room temperature signal from the amplifier 40 and the set temperature signal from the temperature setter 41 are sent to the comparator 3.
Sent to 2,43. Reference numeral 44 denotes a decoding reference signal generator that generates a plurality of reference signals according to instructions from main controller B. read as output,
Decoding room temperature and set temperature.

Reference numeral 45 denotes a display section, which displays the room temperature and the set temperature so that the relationship between the set temperature and the room temperature can be read at a glance, thereby improving usability.

That is, as shown in FIG. 4, the temperature setting signal and the room temperature signal are input to a comparator as voltage signals, and the reference voltage Vref of n from VJ to Vn is generated by the reference signal generator 44, and both the temperatures are T? It decodes to a temperature of ~Tn. As a result of decoding, as shown in FIG. 5, if the room temperature Tmom is lower than the set temperature Ts, T
, or L, the combustion amount q is changed from 0 to q, or from q to q2 (q2>q,). Furthermore, when the room temperature Tmom rises as a result of combustion and reaches Ts or T, the combustion amount q is changed from q, to 0, or from q2 to q, and so-called Hi-Lo-OFF control is executed. be. In FIG. 3, reference numeral 20 denotes a combustion state detector, and the combustion section 4'
is attached to. A signal corresponding to the flame condition (air-fuel ratio) is sent to a comparator 46 and compared with a signal from a combustion condition reference signal generator 47. The combustion state reference signal generator 47 is
Combustion state reference signals e, , e2 shown in FIG. 6 and threshold signals e, which are a certain level apart from said e, , e2
day, e machine, and the above threshold value e for the previous definition ¥,,e2
, day, and second threshold values e, L, and e2L, which are separated by a certain level in a direction different from that of e, are generated by a command from the main control unit B. Therefore, the main control unit B can determine how far the combustion state reference signal e is from the above e or e2 in terms of level. Now, when the room temperature is lower than the set value and strong combustion is required, the main control section B controls the damper device 48 attached to the intake side of the burner fan 2.
The amount of combustion air is set to the amount of air QH for strong combustion. At this time, the relationship between the CQ concentration (air-fuel ratio) in the exhaust gas and e is a curve in the middle of FIG.
・Decode as shown in Figure 7a using 'elm'e.L. Then, depending on which region e is in the region divided by zenshigyo, , e, day, e, shi, the combustion supply amount is determined by the seventh
As shown in Figure a, only Δq is changed.

That is, when l e>e, day, △q=−△q2
(Decrease) 2 e, H〉e＞e, △q=-△q, (
When e, L>e, △q=-△q, (increase) 4 When e, L>e, △q=+△q2 (increase). (increase/decrease) so that it always approaches the reference signal e.

The threshold values e, e, and L are the thresholds for determining the magnitude of the combustion supply quantity change △q, and this is the threshold value for determining whether the negative feedback air-fuel ratio control system can operate stably and quickly. Target standard value e. This was provided to converge to . That is, the above 2
In areas 3 and 3, e, day, e, and L are set as areas in which there is no significant disturbance in the combustion state and in which CO is not generated and the vaporization chamber temperature does not become too low. be. Therefore, in this region, △q can be a small value, and △q is 1 of the fuel supply amount at that time.
The main control unit B controls the pulse pump 11, which is a fuel supply device (fuel supply amount adjusting means), so that the amount of fuel is approximately 2% and approaches the reference signal e. Further, when the room temperature becomes high to a certain extent and a low combustion amount is sufficient, the main control unit B uses the damper device 48 to set the combustion air amount Q to the weak combustion air amount QL.

In this case, the relationship (C02-e) becomes as shown in the curve shown in FIG. 6L, and the combustion state reference signal generator 47 generates a reference signal e2 and threshold signals e2 and e2L.
Then, as in the case of strong combustion described above, the fuel supply amount is changed as shown in FIG. 7b, and the combustion state detection signal e is controlled so as to approach its reference value e2. In this embodiment, the threshold values are one above and one above the reference signal e or e2, and the values e, day, e. Although only L, eS, and e2L are provided, the present invention is not limited to this, and more thresholds and values may be provided.

Further, although the embodiment shows combustion amount control in two stages, strong and weak, it is clear that similar control can be implemented with a larger number of stages.

Further, the main control unit B is configured to control the pulse pump 11 which is a fuel supply device based on the combustion state detection signal e, but the fuel is fixed at a high or low level and the combustion air supply device is a combustion air supply device. Similar effects can be obtained by controlling the burner fan 2 or the damper device 48. In FIG. 3, numeral 49 is a switch means, and the main controller B closes the switch means before changing the fuel supply amount q, and stores the combustion state before changing the fuel supply amount q. Store the detection signal e.

After a certain period of time after changing q by Δq, the main controller B compares the stored e with the combustion state detection signal e' after changing by Δq. That is, the difference signal between e and e' is compared and amplified by the duty amplifier 51, and the difference signal between e and e' is compared and amplified by the reference signal 5.
2 and the comparator 53, and the result is input to the main control section B. If the slope is on the opposite side to the point S to be controlled, as shown by point P in Figure 6, this will quickly return the combustion state to the normal point S side, reducing the generation of soot and CO. Therefore, it constitutes a means for detecting the variation of the combustion state detection signal e with respect to the air-fuel ratio. The amount can be determined as follows. for example,
The result of comparing the detection signal e by the comparator 46 is e) et'
If so, it is necessary to change q in the direction of increasing it by Δq (increasing CQ in FIG. 6). Therefore, when q is increased by △q and e' detected after a certain period of time is e'>e, the slope of e with respect to the air-fuel ratio is determined to be positive, and conversely, when e'<e, Therefore, it can be determined that it is negative. If the annoyance is negative and it is determined that it is not normal, the main control unit B will change the amount of change in q compared to the normal case Aq or △q2.
Pulse pump 1 so as to reduce q with a sufficiently large reduction width.
Control 1. That is, the area of point P shown in FIG.
Since we know in advance the amount of combustion air Q at that time, the minimum change required for it to go beyond the top of the curve and make it positive from the point where the amount of air is negative), the amount of combustion air at that time Q is known in advance, so q at this time according to Q
By determining the range of change in C, the operating point of the pulse pump 11 can be quickly moved to the region of positive slope of the curve in FIG.
You can quickly escape from areas where O and soot are generated heavily. FIG. 8 is a schematic sectional view showing a hot air fan implementing the present invention. In the figure, the same symbols as in FIG. 1 are equivalent. In the figure, a combustion state detector 20 is a flame rod placed in a flame, and detects the combustion state by measuring the ion concentration in the flame. Reference numeral 7 denotes a control device that executes the control contents as described above.

Further, 48 is a damper device, in which a plunger 55 is operated by the current flowing through the winding 54, and the air passage 56 is opened.
The area is changed and, as a result, the amount of combustion air is changed. Further, 21' is a thermistor for detecting the temperature of the vaporizer cylinder 14. FIG. 9 is a circuit diagram of the control device 7, and the same symbols as in FIGS. 2, 3, and 8 are equivalent. In the figure, the control section 57 includes a main control section B,
Based on the signals from the room temperature detector 30 and the temperature setting device 41, the combustion amount is controlled to be strong or weak, and the room temperature is controlled to a set temperature, and the display unit 45 displays the room temperature, set temperature, operating state, etc. Based on the signal from the vaporization cylinder temperature sensor 21', the control section 571 controls the relay contact 58a to control the temperature of the vaporization cylinder.

When the vaporization cylinder temperature reaches a predetermined value, the relay contact 59a is closed, the burner motor 8 is energized, and pre-purge starts. centre. After IJ purge is completed, relay contact 60a closes,
The igniter 37 operates, and the post-preignition control unit 57 sends a repeated pulse signal with a constant pulse width to the photocoupler 61. The pulse signal is inverted by a transistor 62 and sent to an oven amplifier 63, and the oven amplifier 63 connects a power transistor 64 and resistors 65 to 65 to supply a constant current with a constant pulse width to the pulse pump 11.
Together with 69, it forms a constant current circuit. 70 is a diode bridge, 71 is a capacitor, 72 is a Zena diode, 73 is a diode, and 74 to 78 are resistors.

When the control unit 57 detects ignition based on the signal from the combustion state detector 20, the control unit 57 opens the relay contact 60a and stops the operation of the igniter 37 after about 2 seconds of post-ignition. Thereafter, the combustion state detection signal is decoded as described above, and the pulse of the pulse V is supplied to the photocoupler 61 based on the tilt detection signal from the mirror detector 79 comprising the switch means 49, storage means 50, etc. The width and repetition period are changed to control the combustion state detection signal so that it approaches the reference signal. The pulse width T. A method of controlling the repetition period To will be explained. The tenth is a waveform diagram showing constant current pulses supplied to the pulse pump 11. The pulse-on time m, and pulse-off time L of this constant current pulse are supplied to the pulse pump with a cycle L=T, 10T2, and this T and T2 are determined by a digital feedback control system as shown in FIG. The combustion condition is controlled to maintain a favorable combustion condition. In FIG. 11, the signal e from the combustion state detector 20 is decoded by a decoder 8 of the type described in FIGS. 6 and 7, and sent to a central control section 81 having an arithmetic processing function. The central control unit 81 controls the on-time timer 82 and the off-time timer 8.
In order to obtain the fuel supply amount change Δq as shown in FIG. 7 based on the decoding result of the decoder 80, the timer 82, This is to set the initial value of 83.
According to the present invention, as shown in FIGS. 12a and 12b,
This is because the fuel supply amount q of the pulse pump 11 changes almost linearly with respect to changes in T, , T2, and is not affected much by power supply voltage fluctuations. (For example, if the power supply voltage fluctuation is 15%,
The change in fuel supply amount is about ±3% to 4% or less. ) Note that 101 is a time base generator. Furthermore, instead of the off-time timer that counts L, a periodic timer that counts To may be used. In this way, the timer 82
, 83, the central control unit 81 sends a pulse signal to the constant current generator 84 according to the T, and drives the pulse pump 11. .

Therefore, the pulse pump 11 has an on-time T,
The off-time L is controlled by the central control unit 81 so that the result as shown in FIG. 7 is determined by e, and the combustion state in the combustion section 4' becomes extremely stable.

Pulse pump on time T, repetition period To=T.
10T2 is controlled by the central control unit 81 within a region as shown in FIG. That is, T skin aXZTOZT 伽, n T, ma. It is controlled to satisfy ZT, .

That is, T. and T. are constantly compared with T ax, Tomin, T, and max stored in a fixed memo in the central control unit. To is To skin x, Tomi
The range is regulated by n to ensure operational stability of the pulse pump and to prevent flame pulsation, and T,
This is to prevent the fuel supply amount q from becoming too large and causing a serious accident even in the event of an abnormality.Thereby, even in the event of an abnormality in the pulse pump, the equipment can be stopped and safety can be ensured.

Further, when the amount exceeds Tom town and Tomin, the fuel supply amount can be increased by making T larger than before and setting To to Totyp. 14th
The figure is a more detailed circuit diagram of C in FIG.

As mentioned above, since the present invention requires arithmetic processing functions and storage functions, a 4- to 8-bit microcomputer is required. Therefore, FIG. 14 shows the microcomputer 85
(hereinafter referred to as AP) is the main circuit configuration. This mountain P85 belongs to the MB8840 series manufactured by Fujitsu, and its architecture is schematically shown in FIG. In FIG. 15, an oscillator 86 generates a clock for the AP 85, and also has a timer 87, which can create, for example, a time base for lmS according to a command.

88 is a ROM for storing instructions, 89 is a RAM for storing data, and 90 and 91 are input and output latches, respectively.

A processing section 92 includes a control circuit 93, a program counter 94, an arithmetic processing unit (ALU) 95, an accumulator 96, X and Y registers 97 and 98, as well as various flags, an instruction decoder, and the like.

Therefore, the on-timer 82 and off-timer 83 are
It is made using a part of the RAM area 89, and in the various explanations above, the timer used to measure a certain period of time is also based on the reference time base from the timer 87. , are formed in the RAM 89. The circuit shown in FIG. 14 is constructed with P85 as the center.

In FIG. 14, 58 to 60 are relay coils having contacts 58a to 60a in FIG. 9, respectively;
Reference numeral 99 is an IJ relay for strong and weak cutting, and the coil 5 of the dasopa device 48 is connected by the relay contact 99a in FIG.
4, and also switches and controls the rotational speed of the convection fan 23 using a relay contact 99b.

45 is an LED array, and the output of PuP85 is ○◇~0
7, the set temperature and room temperature are displayed by lighting and blinking LEDs, respectively.

Further, in the LED array, 100 is an LED for displaying the operating status, and 102 is an operating switch.
Room temperature sensor 30 is sent as a voltage signal to amplifier 40' by resistor 104 of thermistor 103.

Amplifier 4 Kawama Obe amplifier 105, resistors 106, 107
It is composed of 108 and 109 are resistors,
It provides a reference voltage to the OBE amplifier 105.

The temperature setter 41 is composed of a variable resistor, and the room temperature detector 3
The same voltage as 0 is applied. Resistance ladder circuit 11 CMO driven by outputs R4 to R9 of P85
It is composed of an S buffer 123 and resistors 111 to 122, and the power supply of the CMOS buffer is connected to the Vz. Using the output voltage of the resistance ladder circuit as a reference voltage, the outputs of the amplifier 40 and the temperature setting device 41 are compared by comparators 124 and 125, respectively, and the input K of the peak P85 is
It is input to O, K,.

That is, the room temperature and the set temperature are A/D converted by the rP85 program. 20 is a frame rod, and a voltage proportional to the electrical conductivity between it and the burner head 16 appears across a resistor 126 and a capacitor 127.

Therefore, the output voltage of the oven amplifier 128 appears as a voltage depending on the combustion state as shown in FIG. 129 is a protection resistor.

The output of this combustion state detection circuit 20' is input to a comparator 129. The reference pressure is input to the comparator 129 from the combustion state reference signal generator 47. The reference voltage generator 47 determines the ignition misfire level er'eIH'e・' by the outputs P◇ to P3 of the AP85 as shown in FIG.
It generates seven types of output voltages: eIH', e2, and e2L, and can be obtained by combining resistors 130-135. Therefore, LP85 is
The combustion state detection signal e can be decoded as shown in FIG. 7 using the outputs of P○ to P3 and the input K2 from the comparator 129. Reference numeral 79 denotes a combustion state slope detection circuit, which includes an FET 49 as a switch means, a capacitor 50 as a memory means, an oven 136, and resistors 137 to 137.
140, a comparator 53, and a resistor 141
, 142,
As mentioned above, this is for detecting the slope of the combustion state detection signal with respect to the air-fuel ratio.

The P85 outputs outputs R, . Output a pulse with a pulse width T, which changes the on time T or the off time 2, and take a photo.61
The light emitting diode' gives the signal to the pulse pump 1
At the same time, the FET 49 is turned off by the output R, 3, and the voltage before the change is held by the capacitor 5. At the same time, a timer for a certain period of time provided in the RAM 89 is activated. After the timer times out, the K2 and K3 inputs are input, and e is decoded and the slope is determined. The timer is for compensating for the dead time and delay time until the result of a change in the combustion state after a change in the fuel supply amount appears as the output voltage of the combustion state detection circuit 20'. 2 of the time constant of
More than twice as much is desirable. That is, the decoding of e whose execution is controlled by the rP85, the resetting of the set values of the on timer 82 and off time 83 based on the results, and the determination of the familiarity of e are performed within a certain period of time (for example, 1
It is necessary to configure the control so that it is executed at intervals of a certain period of time (on the order of seconds).
It is possible to compensate for the time delay of the combustion control system based on the detection circuit consisting of ', the capacitor 127, and the resistor 126, and perform stable combustion control.

In other words, stable combustion control can be performed that prevents oscillation of the control system due to response delay in the negative feedback control system. 143 is an oven amplifier, 144 is a protective resistor, 1
45 is a vaporizer cylinder temperature detection circuit, 152 is a crystal oscillator, 153
, 154 are capacitors, and 155 is a resistor.

Effects of the Invention As described above, according to the present invention, the detection signal of the combustion state detection means is combined with the signals of the reference signal generator, the first threshold generator, and the second threshold generator and the combustion state detection signal. The combustion control section is configured to decode into at least four levels by comparing with the comparison means and increase or decrease the fuel supply amount or air supply amount according to the increase/decrease range of the fuel or air amount according to the decoding result. It is possible to optimize the supply of fuel or air according to the state with an extremely simple configuration, and it is possible to achieve high combustion efficiency and clean exhaust gas combustion regardless of the amount of combustion.

Furthermore, by controlling the pulse pump by detecting the combustion state in this manner, it is possible to obtain a stable combustion amount even if the pulse pump has an extremely large variation in the discharge amount. This makes it possible to use low-cost pumps, and at the same time improves the production process.
This will significantly streamline the management process.

As described above, the present invention can improve the performance of combustion equipment and streamline the manufacturing process, and its industrial value is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a conventional hot air heater, Fig. 2 is a control circuit diagram of the same hot air heater, Fig. 3 is a block diagram of a combustion control device showing an embodiment of the present invention, and Fig. 4 is a block diagram of a combustion control device. is A/ in the same device.
An explanatory diagram of D conversion, Fig. 5 is an explanatory diagram of combustion amount control in the same device, Fig. 6 is an explanatory diagram of the combustion state detection method in the same device, and Figs. 7 a and b are combustion state detection signals and fuel supply amount. An explanatory diagram of the control, Fig. 8 is a configuration diagram of a hot air machine implementing the present invention, Fig. 9 is a control circuit diagram of the hot air machine, Fig. 10 is an explanatory diagram of pulse pump operation, and Fig. 11 is a diagram of the hot air machine according to the present invention. A block diagram showing one embodiment, FIG. 12 is an explanatory diagram of the operation and fuel supply amount of the pulse pump according to the embodiment of the present invention, FIG. 13 is an explanatory diagram of the pulse pump operating range, and FIG. FIG. 15 is a detailed diagram of a control circuit showing an embodiment, and is a schematic configuration diagram of a microcomputer. 20... Combustion state detection means, 47... Combustion state reference signal, first and second threshold signal generators, 4
6... Combustion state detection signal comparison means, 11...
・Fuel supply amount adjustment means (pulse pump), 48...
Combustion air amount adjusting means (damper device), B... Combustion control section (main control section). Figure 1 Figure 5 Figure 2 Figure 3 Figure 10 Figure 4 Figure 6 Figure 13 Figure 7 Figure 8 Figure 9 Figure 11 Figure 12 Figure 14 Figure 15

Claims (1)

[Claims] 1. A combustion state detection means, a combustion state reference signal generator,
at least one first threshold generator that generates a signal that is a certain level apart from a reference signal from the reference signal generator; and a first threshold of the first threshold generator with respect to the reference signal. The value signal refers to at least one or more second threshold generators that generate signals separated by a certain level in different directions, and a signal from the combustion state detection means as a combustion state reference signal and a first threshold signal. , combustion state detection signal comparison means for decoding into at least four levels by comparison with a second threshold signal; and a fuel supply amount or combustion air supply amount according to the decoding result obtained from the output of the comparison means. a combustion control section that determines an increase/decrease range of the fuel supply amount or air amount and sends a fuel or air increase/decrease signal to the fuel supply amount adjustment means or the combustion air amount adjustment means to adjust the fuel supply amount or the air amount, and the combustion control section controls the detection by the combustion control section. A combustion control device that controls the fuel supply amount adjusting means or the combustion air adjusting means so that the signal of the means approaches the reference signal. 2. The combustion control section is provided with an oscillator that creates a time base, and the combustion state detection signal comparison means decodes the detection signal and increases or decreases the fuel supply amount or combustion air amount based on the decoding result at predetermined time intervals. A combustion control device according to claim 1 constructed.