JP3291134B2 - Control method and apparatus for incomplete combustion of combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for incomplete combustion of a combustion device such as a water heater and a control device therefor.

[0002]

2. Description of the Related Art FIG. 5 shows a system configuration of a general water heater as a combustion device. In the figure, a water supply pipe 3 is connected to the inlet side of the heat exchanger 2, and the water supply pipe 3 is provided with a water supply thermistor 10 for detecting a water supply temperature and a flow sensor 9 for detecting a water supply amount. ing. A hot water supply pipe 4 is connected to an outlet side of the heat exchanger 2, and a hot water tap 1 is provided at an outlet side of the hot water supply pipe 4. Further, the hot water supply pipe 4 is provided with a water flow control valve 16 as a flow control means whose valve opening is controlled by a gear motor, and a tapping thermistor 11 for detecting tapping temperature.

A burner 7 serving as combustion heating means, an igniter electrode 18 for igniting the burner 7,
A flame rod electrode 19 for detecting ignition and a combustion fan 5 for supplying / exhausting gas are provided. A gas nozzle 6 is disposed opposite to a gas inlet of a burner 7, and a gas pipe 8 connected to the gas nozzle 6 is provided with a gas. A gas proportional valve 13 that controls the supply amount by the valve opening amount, and a gas solenoid valve 12 that opens and closes a pipe line
And are interposed.

A water heater of this type is provided with a control device 14. A remote control 15 is connected to the control device 14, and a button for instructing a hot water supply operation, a button for setting a hot water supply temperature, A display unit for displaying a set hot water supply temperature is provided. In addition, on the top wall of the exhaust gas, C
A CO sensor (carbon monoxide gas sensor) 20 is provided as a CO detection sensor for detecting the O concentration (carbon monoxide gas concentration), and a CO detection signal of the CO sensor 20 is applied to the control device 14.

The control device 14 includes a circuit for controlling the hot water supply combustion operation and a circuit for performing the CO safety operation. The control circuit for the hot water supply combustion operation controls the hot water supply operation of the water heater as follows. When the hot water tap 1 is opened, the flow sensor 9 detects the amount of incoming water, and receives a signal from the flow sensor 9 when the amount of incoming water becomes a certain value or more (minimum operating flow or more).
The control device 14 rotates the combustion fan 5. Then, when the rotation of the combustion fan 5 enters a predetermined rotation region, the gas solenoid valve 12 and the gas proportional valve 13 are opened to supply gas to the burner 7, and the igniter electrode 18 performs an ignition operation. When the flame rod electrode 19 detects the ignition of the gas, the control device 14 performs feedforward control so that the outlet temperature becomes the set temperature, changes the valve opening amount of the gas proportional valve 13, and controls the temperature of the outlet water from the heat exchanger 2. After the hot water temperature is stabilized, the combustion control is performed by the combined control of the feedforward control and the feedback control.

The control device 14 for performing the combustion control is provided with a normal mode and an improved mode combustion control system.
In the normal mode, when the CO detection value obtained from the CO sensor 20 is lower than a predetermined reference value in a complete combustion state, the gas proportional valve 13 is opened according to a required heat quantity required to increase the incoming water temperature to the set temperature. The gas supply amount is controlled by the control, and the rotation of the combustion fan 5 is controlled so that an air amount corresponding to the gas amount is obtained. On the other hand, in the improvement mode, C
When the O detection concentration exceeds the reference value, the combustion fan 5 is used to improve the incomplete combustion state in the complete combustion direction.
The combustion speed is increased by increasing the number of revolutions by a predetermined amount to increase the amount of combustion air, and the combustion control is performed in a direction to decrease the concentration of CO gas in the exhaust gas. As another operation of the improvement mode, there is a control method for reducing the opening amount of the gas proportional valve 13 and reducing the gas supply amount to the burner 7 to reduce the CO generation concentration.

[0007] The circuit for the CO safety operation of the control device 14 is as follows.
When the concentration of CO detected by the CO sensor 20 reaches a predetermined dangerous concentration, combustion is stopped, or the CO concentration of the CO sensor 20 is changed every predetermined sampling time.
The detection signal is sampled, and C
The CO safety operation is performed in various signal processing modes such as integrating the O detection values and stopping the combustion when the integrated value reaches a predetermined danger determination set value.

FIG. 6 is a flowchart showing a specific example of the operation of the conventional water heater. When the operation switch of the appliance is turned on, in step 101, a stop flag for judging combustion stop is cleared to zero. The fan-up flag for judging the rotation of the combustion fan 5 is cleared to zero. Note that when the stop flag is zero, it indicates a command not to stop combustion, and when the flag is set to 1, it indicates a command to stop combustion. When the fan-up flag is zero, it means an operation command for not performing the fan rotation up, and when the fan-up flag is 1, it means the fan rotation up command.

In step 102, it is determined whether or not flowing water is detected by the flow sensor 9. When running water is not detected, hot water supply combustion is stopped (hot water tap 1 is closed).
Then, both the stop flag and the fan-up flag are set to zero to prepare for the next hot water supply combustion. When it is determined in step 102 that the running water is ON, it is determined in next step 103 whether or not 1 is set in the stop flag. When 1 is set in the stop flag, it is the combustion stop command state, so that the ignition operation is not performed and the stop state of the combustion operation is maintained. On the other hand, when 1 is not set in the stop flag, that is, when the stop flag is zero, the operation proceeds to the next step 104.

At step 104, the fan-up flag is set to 1
It is determined whether or not is standing. When the fan-up flag is set to 1, the improvement mode in step 105 is selected, and when the fan-up flag is not set to 1, the normal mode is selected. In the first operation in which the operation switch is turned on, since both the stop flag and the fan-up flag are cleared to zero in step 101,
In step 106, the normal mode is selected, and in step 107, the combustion operation in the normal mode is performed.

In step 108, the CO detection value of the CO sensor 20 is not less than 3000 ppm, which is a dangerous concentration, or not more than 1500 ppm of CO safety, or 1500 pp which requires combustion improvement.
Judge whether it is within the range of m to 3000 ppm. The reference value that is the boundary between the normal mode and the improvement mode is set to 1500 ppm in the present embodiment. When the CO detection value is equal to or less than the reference value 1500 ppm, the combustion operation is continuously performed in the normal mode, and the CO detection value is 1500 ppm. If it is between 3,000 ppm, the detected CO concentration exceeds the reference value of 1500 ppm and the combustion is incomplete, so the fan-up flag is set to 1 in step 109, and the normal mode is shifted to the improvement mode. Is performed. In addition, the CO detection concentration is 3000
If it is not less than ppm, stop flag 1
Is established, and the combustion is immediately stopped in step 111, and C
O safety is achieved.

[0012]

Generally, the incomplete combustion of the water heater may be caused by a decrease in the combustion performance of the appliance (water heater) itself. However, the combustion performance of the appliance itself has not decreased. Even in this case, for example, when a ventilation fan is used in a state where the water heater is installed indoors, the pressure in the room is reduced, and the amount of air (air amount) supplied from the combustion fan 5 to the burner 7. Becomes inadequate and incomplete combustion occurs. In addition, even when the water heater is installed outdoors, when a reverse wind blows to the exhaust side during the combustion operation, the amount of air blown by the combustion fan 5 becomes similarly insufficient, and incomplete combustion occurs. .

When such an incomplete combustion state occurs,
That is, when the CO detection concentration exceeds the reference value of 1500 ppm, as shown in FIG. 4, the control mode is switched from the normal mode to the improvement mode in order to improve the combustion in the incomplete combustion state in the complete combustion direction. However, as described above, for example, when the ventilation fan is turned while using the indoor-installed water heater, even if the mode is switched to the improvement mode, the combustion performance is improved from the moment when the mode is switched. It is difficult to achieve this, and after a time lag (time delay) Δt has elapsed after switching the combustion control mode, the effect of improving combustion appears and the CO concentration in the exhaust gas decreases. In some cases, the detected CO concentration in the gas temporarily exceeds the dangerous concentration of 3000 ppm. In such a case, if the CO concentration slightly exceeds the dangerous concentration before the combustion improvement in the improvement mode appears, C
O safety circuit operates, combustion operation is stopped,
There was a problem that the water heater could not be used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a combustion improvement effect of the improvement mode when the combustion control mode is switched from the normal mode to the improvement mode. An object of the present invention is to provide a control method and a device for controlling incomplete combustion of a combustion apparatus in which combustion is not stopped even if the CO concentration in the exhaust gas temporarily exceeds the dangerous concentration before it appears.

[0015]

The present invention is configured as follows to achieve the above object. That is, in the first method of the present invention, a CO detection sensor for detecting the CO concentration in the exhaust gas is provided on the combustion exhaust side, and when the CO detection concentration of the CO detection sensor exceeds a predetermined reference value, the combustion state is reduced. Combustion control is performed in the improvement mode for improving the complete combustion direction. When the detected CO concentration is lower than the reference value, the combustion control is performed in the normal mode. When the detected CO concentration is equal to or higher than the predetermined dangerous concentration, the combustion is a CO safe operation. In the control method of a combustion device for performing a stop, when the CO detection concentration of the CO detection sensor exceeds the reference value during combustion in the normal mode and the combustion control mode is switched from the normal mode to the improvement mode, the mode is switched. Measures the time from the time, and the effect after the combustion control in the improvement mode starts
Until the elapse of a predetermined short time lag time required before the appearance of the CO, the operation of stopping the combustion, which is the CO safe operation, is canceled even if the detected CO concentration becomes higher than the dangerous concentration, and the improvement mode after the elapse of the time lag time. At
During the combustion control of CO
When burning is stopped, the combustion control mode is
Mode from normal mode to next combustion operation.
Provided the rolling is configured as characterized Rukoto.

In a second method of the present invention, a CO detection sensor for detecting the CO concentration in the exhaust gas is provided on the combustion exhaust side, and when the CO detection concentration of the CO detection sensor exceeds a predetermined reference value. Combustion control is performed in the improvement mode for improving the combustion state in the complete combustion direction. When the detected CO concentration is lower than the reference value, the combustion control is performed in the normal mode.
When the O detection concentration is equal to or higher than a predetermined dangerous concentration, in the control method of a combustion device of a water heater that performs combustion stoppage, which is a CO safe operation, the CO detection concentration of the CO detection sensor during the combustion in the normal mode is equal to the reference value. When the combustion control mode is switched from the normal mode to the improvement mode over time, the time from when the mode was switched is measured, and the combustion mode in the improvement mode is measured.
Preliminary time required from the start of baking control until its effect appears Until the given short time lag time elapses, even if the detected CO concentration becomes higher than the dangerous concentration, the combustion is stopped, which is a CO safe operation. cancel the operation, have <br/> line combustion stop of CO safe operation when CO detection concentration is more dangerous concentration in the combustion state in the improvement mode after the lag time has elapsed, the water heater after the combustion stops Check that the water flow has stopped
The combustion control mode from the improvement mode to the normal mode
Instead, it is configured to prepare for the next combustion operation .

Further, the apparatus according to the present invention is provided with a CO detection sensor provided on the combustion exhaust side for detecting the CO concentration in the exhaust gas, and when the CO detection concentration of the CO detection sensor exceeds a predetermined reference value. A control mode selection command unit for commanding combustion control in an improvement mode for improving the combustion state to a complete combustion direction, and commanding combustion control in a normal mode when the CO detection concentration is lower than the reference value; Stop combustion when the concentration exceeds the given dangerous concentration.
O in the control device of the combustion equipment provided with the safety operation unit,
During the combustion in the normal mode, when the CO detection concentration exceeds the reference value and the control mode selection command unit switches the control mode from the normal mode to the improvement mode, the elapsed time from the time of the mode switch is determined. The effect of the combustion control in the improvement mode from the time of the mode switching based on the time measurement means for measuring and the time measurement result of the time measurement means.
Until beforehand given short lag time required until appearing passed and safe operating canceling unit CO detection concentration cancels the CO safe operation of the combustion stop operation even become dangerous concentration or more, the time lag time
During the combustion control in the improvement mode after the elapse, the CO detection
If the combustion is stopped because the temperature exceeds the dangerous concentration,
After the combustion is stopped, the combustion control mode is changed from the improvement mode to the normal mode.
And a means for switching to the mode and preparing for the next combustion operation .

[0018]

In the present invention having the above structure, when the combustion equipment is operating in the normal mode and the detected CO concentration exceeds a predetermined reference value, it is determined that the combustion is in an incomplete combustion state, and the combustion control mode is switched to the incomplete combustion state. Switching from the normal mode to the improvement mode.

When the combustion control mode is switched, the elapsed time from the mode switching is measured by the time measuring means, and a time lag time given in advance after the mode switching, that is, an effect of increasing the combustion performance in the improvement mode appears. Until time elapses, even if the detected CO concentration is equal to or higher than the dangerous concentration, the combustion stop operation of the CO safe operation is canceled.

If the CO concentration in the exhaust gas does not decrease even after the time lag has elapsed and the detected CO concentration is higher than the dangerous concentration, it is determined that the combustion performance of the appliance itself is poor, In this case, the CO safety operation starts immediately and the combustion is stopped.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals are given to the same names as those in the conventional example, and the duplicated description thereof will be omitted. The combustion device with a CO detection sensor of the present embodiment is directed to the water heater shown in FIG. 5 similarly to the conventional example, and a CO sensor 20 for detecting the CO concentration in the exhaust gas is provided on the exhaust top side of the water heater. Further, the control device 14 is provided with a circuit for controlling the combustion operation and a circuit for performing the CO safety operation.

FIG. 1 shows a circuit configuration for controlling the occurrence of incomplete combustion according to an embodiment of the present invention, which is provided in a control device 14, and includes a control mode selection command section 21 and a CO safe operation section.
22, a combustion control unit 23, a safe operation canceling unit 24, and a cancel timer 25 as time measuring means. The control mode selection command section 21 takes in the CO detection signal of the CO sensor 20 installed on the exhaust side of the water heater and outputs a reference value given in advance, 15 in this embodiment.
The value of 00 ppm is compared with the CO detection value, and when the CO detection value exceeds the reference value, an improvement mode for improving the incomplete combustion state in the complete combustion direction is selected, and the CO detection value falls below the reference value. At times, a normal mode command is added to the combustion control unit 23 and the safe operation cancel unit 24, respectively.

The combustion control unit 23 performs the combustion control in the normal mode when the normal mode command is applied from the control mode selection command unit 21 as in the conventional example, and performs the improvement mode When the selection command is applied, the combustion control in the improvement mode is performed. As described above, the control operation in the improvement mode includes a method of increasing the number of revolutions of the combustion fan 5 and a method of reducing the amount of gas supplied to the burner 7 by reducing the opening amount of the gas proportional valve 13. ,
In some cases, both may be used, and either of these methods may be used. In this embodiment, a fan-up method is used.

The safe operation canceling unit 24 receives a control mode selection command from the control mode selection specifying unit 21 and instructs a cancel timer 25 to perform a timer operation when the control mode is switched from the normal mode to the improvement mode. According to the timer operation command from the safe operation canceling unit 24, the cancel timer 25 measures the elapsed time from the switching of the control mode with the time when the combustion control mode is switched from the normal mode to the improvement mode as a start point, and determines the measurement result. Added to the safe operation cancel unit 24.

The safety operation canceling unit 24 is given in advance a time lag time required from the start of the improvement mode until the effect appears, as a predetermined fixed time within a range of, for example, 5 seconds to 10 seconds. The safety operation canceling unit 24 determines whether or not the elapsed time from the switching of the combustion control mode from the normal mode to the improvement mode exceeds a time lag time, and the elapsed time from the mode switching does not exceed the time lag time. In the meantime, the CO
A cancel signal for safe operation is added, and the cancel timer 25
When the measured time elapses the time lag time, the output of the cancel signal to the CO safety operation unit 22 is stopped.

The dangerous CO concentration is given to the CO safe operation unit 22 as, for example, a value of 3000 ppm. When the cancel signal is not applied from the safe operation cancel unit 24, the CO safe operation unit 22 outputs When the CO detection signal is received from the CO sensor 20 and the detected CO concentration becomes equal to or higher than the dangerous concentration, the gas solenoid valve 12 is immediately shut off to stop burning the water heater. On the other hand, the CO safety operation unit 22 cancels the CO safety operation while the cancel signal is added from the safe operation cancellation unit, and even if the CO detection concentration of the CO sensor 20 is higher than the dangerous concentration, C
The combustion operation state is continued without performing the O safety operation (the shutoff operation of the gas solenoid valve 12).

FIG. 2 is a flow chart showing the control operation of the present embodiment. The same operation parts as those of the flow chart of the conventional example of FIG. 6 are denoted by the same step numbers, and a duplicate description thereof will be omitted. In the operation of this embodiment, the operations of steps SP1 to SP7 are added to the operation of the conventional example shown in the flowchart of FIG. In step SP1, step 108
When the detected CO concentration is in the range of 1500 to 3000 ppm, that is, when the detected CO concentration exceeds the reference value, it is determined whether or not 1 is set in the fan-up flag. If the combustion operation has already been switched from the normal mode to the improvement mode and the combustion operation has been performed, the fan-up flag is set to 1 and in this case, the cancel timer 25 has been turned on, and therefore the process proceeds to step 102. The following operation is performed.
If the fan-up flag is not set to 1, that is,
If the detected CO concentration exceeds the reference value while the combustion operation is being performed in the normal mode, the fan-up flag is set to 1 in step 109, the cancel timer 25 is started, and the operations in and after step 102 are performed. Do. In this case,
By setting the fan-up flag to 1 in step 109, the combustion control mode is switched from the normal mode to the improvement mode.

In step SP3, in step 108, CO
When it is determined that the detected concentration is equal to or higher than the dangerous concentration of 3000 ppm, it is determined whether 1 is set in the fan-up flag. If the detected CO concentration exceeds the dangerous concentration during combustion in the normal mode, 1 is not set in the fan-up flag.
To switch the combustion control mode from the normal mode to the improvement mode, and start the cancel timer 25 in the next step SP5.

On the other hand, CO combustion is performed by the combustion operation in the improvement mode.
If the detected concentration exceeds the dangerous concentration, step SP3
It is determined that the fan-up flag is set to 1 at this time. At this time, it is determined whether or not the cancel time (time lag time) has elapsed in step SP6. If the time lag time has not elapsed since the start of the improvement mode, the operation after step 102 is performed without performing the combustion stop which is the CO safe operation.

On the other hand, when the timer time, that is, the time lag time has elapsed since the start of the improvement mode,
In step 110, the stop flag is set to 1 and in step 11
1 to stop combustion. Then, in the next step SP7, it is determined from the detection signal of the flowing water sensor 9 whether or not the flowing water is on. The running water ON state means a state in which the hot water tap 1 is kept open in a state in which combustion is stopped, and in this case, it waits until the hot water tap 1 is closed. If it is determined in step SP7 that the running water is off, that is, if it is determined that the hot water tap 1 is closed, the operation proceeds to the next step 102. In step 102, the running water off state is determined. Therefore, in step 112, both the stop flag and the fan-up flag are cleared to zero to prepare for the next combustion operation, and the next combustion operation starts in the normal mode. Is done.

According to this embodiment, when the combustion control mode is switched from the normal mode to the improvement mode, the cancel timer is started, and the combustion operation in the improvement mode causes the CO concentration in the exhaust gas to reach the dangerous concentration. However, as shown in FIG. 3A, the CO safety operation is canceled until the time lag elapses, and the combustion is not stopped. Therefore, as shown in FIG. Thus, the conventional problem that the combustion is stopped and the water heater cannot be used can be surely solved.

Further, if the CO concentration in the exhaust gas is higher than the dangerous concentration even after the lapse of the time lag, as shown in FIG. Therefore, there is no particular problem with respect to CO safety.

The present invention is not limited to the above-described embodiment, but can take various embodiments. For example, in the above embodiment, the CO detection sensor is constituted by the CO sensor 20,
Although the CO concentration in the exhaust gas is directly detected, for example, the CO detection sensor is constituted by another sensor such as an O ₂ sensor or a CO ₂ sensor, and the CO concentration in the exhaust gas is indirectly detected. You may do so.

In the above embodiment, the reference value of the CO concentration for judging incomplete combustion is 1500 ppm, and the dangerous concentration is 3000 ppm.
As described above, these values can be set to other appropriate values.

Further, in the above embodiment, a water heater was described as an example of a combustion device. However, a combustion device with a CO detection sensor according to the present invention includes a bath kettle, an air conditioner, a heating device, a cooling device, a cooling / heating device, and a fan. The present invention is applied to various other combustion devices using gas or oil as a fuel, such as a heater.

[0036]

According to the present invention, when the CO detection concentration of the CO detection sensor exceeds the reference value and the combustion control mode is switched from the normal mode to the improvement mode, the time from the mode switching is measured, and the time is measured in the improvement mode. During the period of the time lag when the combustion improvement of
Even if the concentration reaches the dangerous concentration, the CO-safe combustion stop operation is not performed, and the CO safe operation (combustion stop operation) is performed when the detected CO concentration is equal to or higher than the dangerous concentration even after the lag time elapses. Therefore, although the combustion performance has been improved by switching from the normal mode to the improvement mode as in the conventional example,
When the detected CO concentration reaches a dangerous concentration even during the time lag period in which the effect is exhibited, the inconvenience of stopping the combustion and making it impossible to use the combustion equipment can be effectively eliminated.

Further, the time of the time lag is extremely short, and there is no safety problem even if CO exceeding the dangerous concentration occurs during the time lag, and the detected CO concentration exceeds the dangerous concentration after the time lag has elapsed. As soon as the CO safety operation is activated and the combustion is stopped,
Safety against CO can be sufficiently achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart including an operation of a control method when incomplete combustion occurs according to the present embodiment.

FIG. 3 is an explanatory diagram of a control mode when incomplete combustion occurs in the present embodiment.

FIG. 4 is an explanatory diagram of a conventional control operation when incomplete combustion occurs.

FIG. 5 is a system configuration diagram of a general water heater as a combustion device.

FIG. 6 is a flowchart including a control operation when incomplete combustion occurs in a conventional water heater.

[Explanation of symbols]

 14 Control device 20 CO sensor 21 Control mode selection command section 22 CO safe operation section 23 Combustion control section 24 Safe operation cancel section 25 Cancel timer

Claims (3)

(57) [Claims] 1. A CO detection sensor for detecting the CO concentration in exhaust gas is provided on the combustion exhaust side, and when the CO detection concentration of the CO detection sensor exceeds a predetermined reference value, the combustion state is improved in a complete combustion direction. Combustion control is performed in the improvement mode. When the detected CO concentration is lower than the reference value, the combustion control is performed in the normal mode. In the control method, when the CO detection concentration of the CO detection sensor exceeds the reference value during combustion in the normal mode and the combustion control mode is switched from the normal mode to the improvement mode, a time from the mode switching is measured. After the combustion control in the improvement mode starts, the effect
Until a predetermined short time lag required before the elapse of the time, the operation of stopping combustion, which is a CO safe operation, is canceled even if the detected CO concentration exceeds the dangerous concentration.
In the improvement mode after the lapse of the time lag,
Combustion when CO detection concentration exceeds dangerous concentration during combustion control
When stopped, the combustion control mode after the combustion is stopped
From the improvement mode to the normal mode, and the next combustion operation
Control method during incomplete combustion occurs in the combustion apparatus, characterized in Rukoto provided to. 2. A CO detection sensor for detecting a CO concentration in exhaust gas is provided on the combustion exhaust side, and when the CO detection concentration of the CO detection sensor exceeds a predetermined reference value, the combustion state is improved in a complete combustion direction. The combustion control is performed in the improvement mode. When the detected CO concentration is lower than the reference value, the combustion control is performed in the normal mode. When the detected CO concentration is equal to or higher than the predetermined dangerous concentration, the combustion stop which is the CO safe operation is performed.
In the control method of the combustion equipment of the water heater, when the CO detection concentration of the CO detection sensor exceeds the reference value during combustion in the normal mode and the combustion control mode is switched from the normal mode to the improvement mode, the mode is switched. Measure the time from the start of combustion control, and take effect after the combustion control in the improvement mode starts.
Until the elapse of a short time lag time given in advance required for the result to appear, even if the detected CO concentration becomes equal to or higher than the dangerous concentration, the operation of stopping combustion as a CO safe operation is canceled, and after the elapse of the time lag time, There line combustion stop of CO safe operation when the CO concentration detected by the combustion state in the improvement mode or hazardous concentration, hot water after the combustion stops
Check that the water flow through the heater has stopped before improving the combustion control mode.
A method for controlling incomplete combustion of a combustion device when a combustion mode is switched from a normal mode to a normal mode to prepare for a next combustion operation . 3. The method according to claim 1, further comprising the step of:
A CO detection sensor for detecting the O concentration, and when the CO detection concentration of the CO detection sensor exceeds a predetermined reference value, a combustion control in an improvement mode for improving the combustion state to a complete combustion direction is commanded. A combustion device comprising: a control mode selection command section for commanding combustion control in a normal mode when is below the reference value; and a CO safety operation section for stopping combustion when the detected CO concentration is equal to or higher than a predetermined dangerous concentration. When the control mode is switched from the normal mode to the improvement mode by the control mode selection command unit while the CO detection concentration exceeds the reference value during the combustion in the normal mode, and time measuring means for measuring an elapsed time from fuel improvement from the time measurement result when the mode switching based mode of the time measurement means Cancel the CO detection concentration the CO safe operation of the combustion stop operation even become dangerous concentration or until the elapse of the short time lag given pre <br/> Me required for the effect of control appears Safety operation canceling section, and the improvement mode after the time lag time elapses.
Detected during the combustion control in
When the combustion is stopped, the combustion
Switch the control mode from the improvement mode to the normal mode and
A control device for incomplete combustion of a combustion device , comprising: means for preparing for combustion operation .