JP2618105B2 - Ignition control device for 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 an ignition control device for a combustion apparatus for controlling an igniter provided in a burner.

[0002]

2. Description of the Related Art Many types of combustion equipment such as a stove burner used in a cooker and the like are provided with an igniter for performing ignition by, for example, spark discharge or an electric heater, and perform an ignition operation for supplying fuel to the burner. Then, the operation of the igniter starts based on the signal of the ignition switch that operates in connection with the ignition operation. This igniter is controlled by an ignition control device, and once the ignition switch is closed or opened by the ignition operation, an ignition timer for measuring a certain time based on the signal is operated, and a certain period of time after the ignition operation is performed by the combustion equipment. It continues to operate even if you release your hand. Further, in the ignition control device, a large amount of electric power is required for the operation of the igniter as compared with the time of combustion, and in order to reduce the power consumption,
Alternatively, if the igniter operates indefinitely in spite of the ignition, it will give the impression that the operation for ignition detection has not been performed properly, so in order to prevent such an impression, The ignition detection is performed by a thermocouple provided to close the gas valve, and when the ignition is detected after the ignition operation is started, the operation of the igniter is stopped, and the use of the igniter is stopped after the ignition of the burner. There are things that stop working. In this case, ignition detection is determined by whether or not the output voltage of the thermocouple has exceeded a predetermined voltage.

[0003]

However, the output voltage of the thermocouple has a slow response to the heating by the burner, and after the fire extinguishing operation of the burner, the temperature drop of the thermocouple is delayed due to the residual heat. The output voltage does not drop immediately. Under these conditions, in order to detect ignition as quickly as possible to stop the operation of the igniter, a voltage value lower than the output voltage value when the thermocouple is sufficiently heated must be used as the reference voltage value for ignition detection. but is <br/> shall, Then, once the case to ignite the fire fighting has been burner again (hereinafter referred to as hot start),
The ignition detection is erroneously performed by the output voltage of the thermocouple that is not sufficiently cooled, and as a result, the operation of the igniter is stopped even though the burner is not ignited. For this reason, in the hot start, there is a problem that ignition cannot be performed until the thermocouple has cooled sufficiently. Also, the reference voltage value for ignition detection is
May be higher than the output voltage during
However, quick ignition detection is not possible and the reference voltage
Setting values is difficult.

According to the present invention, in an ignition control device for a combustion apparatus in which an igniter is continuously operated by an ignition operation and a burner is detected by a thermocouple, even if a hot start accompanying the reuse of a burner is performed, it is possible to quickly start the ignition. It is intended to perform ignition in a reliable manner.

[0005]

Means for Solving the Problems The present invention provides a first invention,
In an ignition control device of a combustion apparatus for starting operation of an igniter provided in a burner to which fuel is supplied in connection with the ignition operation in association with the ignition operation, and stopping operation of the igniter after a predetermined time, a timer for counting a predetermined short time than the predetermined time to start in relation to the ignition operation, and a heat generating element which is heated by the burner, the output voltage of the heat generating element after the count end of the timer predetermined Voltage
It is a technical means to perform an ignition stop operation for stopping the operation of the igniter when it becomes higher . The second invention is
A burner that is supplied with fuel in connection with the ignition operation
Starting the operation of the igniter in relation to the ignition operation,
Ignition of combustion equipment that stops the operation of the igniter after a fixed time
The control device includes a thermoelectric element heated by the burner, and a timer for measuring a predetermined time shorter than the predetermined time, and the output of the thermoelectric element during the ignition operation.
If the voltage is higher than a predetermined voltage , the timer is operated to operate the igniter for the predetermined time period measured,
When the voltage is lower than the predetermined voltage , the output of the thermoelectric generator is
Technical means is to stop the operation of the igniter when the voltage becomes higher than the predetermined voltage .

[0006]

According to the first aspect of the present invention, when the ignition operation is performed, the igniter starts operating, and at this time, the timer starts measuring a predetermined time. When the burner is ignited by the operation of the igniter during the predetermined time, the thermoelectric generator is heated and an output voltage is generated. The igniter always operates until the timer finishes measuring a predetermined time, and when the timer finishes counting, it is determined whether to stop the operation of the igniter based on the output voltage of the thermoelectric generator. Will be An output voltage corresponding to the ignition detection is obtained.If the output voltage is higher than a predetermined voltage , an ignition stop operation for stopping the operation of the igniter is performed.If an output voltage corresponding to the ignition detection is not obtained, Subsequently, the igniter is operated to continue the ignition operation, and the operation of the igniter is stopped when an output voltage corresponding to the ignition detection is obtained.
After a certain period of time, a voltage equal to or higher than a predetermined voltage according to ignition detection
Even if the output voltage is not obtained, the operation of the igniter stops.
According to the second invention, when the output voltage of the thermoelectric generator when the ignition operation is performed is less than the predetermined voltage , the output voltage becomes equal to or higher than the predetermined voltage according to the output voltage of the thermoelectric generator.
, The operation of the igniter is stopped. Conversely, the ignition operation is performed
When the output voltage of the thermoelectric generator at the time of the start is equal to or higher than the predetermined voltage , the timer operates, and the igniter always operates during the predetermined time measured by the timer.

[0007]

According to the first aspect of the present invention, the igniter always operates regardless of the presence or absence of ignition detection from the start of the ignition operation to the end of the predetermined time elapsed by the timer. Therefore, when a hot start is performed by re-ignition after extinguishing the burner, the temperature of the thermoelectric generator is not sufficiently low due to the high temperature of the thermoelectric generator even though the burner is not ignited. The igniter operates for a predetermined time even if the same output voltage is output as in the state.
Therefore, the operation of the igniter does not stop based on the erroneous output voltage of the thermoelectric generator. Therefore, even in the case of a hot start in which the temperature of the thermoelectric generator is high at the beginning of the ignition operation, the ignition operation can be reliably performed. In the hot start, since the output voltage of the thermoelectric generator is ignored, it is easy to set the reference value of the thermoelectric generator to determine whether or not the burner has ignited. The stability of stopping the operation of is increased. Therefore, when ignition occurs, the operation of the igniter can be stopped quickly, and power consumption for driving the igniter can be reduced. According to the second aspect, at the time of the ignition operation when the hot start is not performed, the operation of the igniter is stopped when the thermoelectric generator is heated with the ignition of the burner and the output voltage of the thermoelectric generator reaches a predetermined voltage . Therefore, the igniter does not operate more than necessary. In the case of a hot start, the igniter always operates for a predetermined time regardless of the output voltage of the thermoelectric generator, so that the ignition operation can be reliably performed and the burner is reliably ignited. Can be done.

[0008]

Next, the present invention will be described based on an embodiment of a gas table 100 for a system kitchen. The gas table 100 shown in FIG. 2 is a composite cooker provided with a plurality of gas stoves, a grill and a cooking chamber, and a gas stove 1 as a combustion device according to an embodiment of the present invention is provided on an upper surface thereof. Is provided. The gas stove 1 uses a circular stove burner 10 as a heating source, and in the center of the stove burner 10,
A temperature sensor 21 for detecting the temperature of the object to be cooked via a cooking container is provided. The temperature sensor 21 is elastically pressed against the cooking container by a spring (not shown), and a thermistor as a temperature detecting element is built in a metal cylindrical container having a closed end.

As shown in FIG. 3, fuel gas is led to the burner burner 10 by a gas pipe 11 branched from a main gas pipe (not shown), and an air supply port of the burner burner 10 is provided at a downstream end of the gas pipe 11. Are provided corresponding to the nozzles. The gas pipe 11 has an original solenoid valve 1
3, a gas proportional valve 14 is arranged in the downstream part, and the gas pipe 11 is branched into two between the original solenoid valve 13 and the gas proportional valve 14 to form two branch pipes 15 and 16. An electromagnetic valve 17 is disposed on one of the diverting pipes 15, and the other diverting pipe 16 is
Is provided with a throttle solenoid valve 19 having an orifice 18 having a throttle function with respect to the nozzle 12 at the downstream end. On the other hand, the stove burner 10 is provided with an ignition electrode 22 and a thermocouple 23 which is heated by a flame as a thermoelectric generator for detecting ignition of the stove burner 10.
The gas stove 1 having the above configuration is used for the gas table 10.
0 according to the operation of the operation unit provided in front of
0, and the control state of the control device 30 is displayed on the display unit 4.

Hereinafter, the gas stove 1 in the control device 30 will be described.
Configurations and functional units related to and their operations will be described. The gas stove 1 has a cylindrical operation photograph 2 for performing a point fire extinguishing operation and a heating power adjustment of the stove burner 10 on the front of the gas table 100, and an operation that can be accommodated in the main body of the gas table 100 by an opening / closing mechanism. An operation panel provided in the box 3 is provided, and a display unit 4 including a fluorescent display tube for displaying each operation state is provided on the front surface. The operation shooting 2 has two position states of a protruding state as an ignition and combustion position and a pushed state as a fire extinguishing position, and a state holding mechanism for maintaining each state and detection for detecting each state. A switch is provided, and each state is alternately changed each time a pressing operation is performed. Further, the operation shooting 2 is provided with an encoder of an endless mechanism that sends an increment signal in accordance with the rotation direction of the rotation operation. A dynamic operation can be performed, and the adjustment state is indicated by the number of lighting of a plurality of LEDs (not shown) provided above the operation shooting 2.

As shown in FIG. 4, the control device 30 has a control circuit 30 mainly composed of a microcomputer.
A, an ignition circuit 30B that operates according to a control signal of the control circuit 30A, and a valve drive circuit 30C. Control circuit 3
0A includes functional units such as a point fire extinguishing control unit 31, a thermal power control unit 32, and a valve control unit 33.

The point fire extinguishing control unit 31 includes an ignition timer 31a which starts time measurement in response to an ignition operation signal of the operation shooting 2, and operates for a predetermined time t1 (for example, 10 seconds) measured by the ignition timer 31a. Then, the supply of the fuel gas is started, and the ignition circuit 30B is operated to perform the ignition operation of the stove burner 10. In addition, during the operation for the certain time t1, the determination of the ignition detection by the thermocouple 23 is performed, and when the ignition is detected, the detection is performed for the certain time t1.
Even after elapse, each valve is controlled to be open. Further, in order to minimize unnecessary operation of the ignition circuit 30B after ignition, a predetermined time t2 shorter than the predetermined time t1 is used.
After (for example, 5 seconds) is counted by the ignition timer 31a, an ignition stop operation for forcibly stopping the operation of the ignition circuit 30B based on the output voltage of the thermocouple 23 is performed.
Here, a case where the output voltage of the thermocouple 23 is higher than 2.5 mV as a reference voltage for ignition detection is determined as ignition detection, and a case where the output voltage is less than 2.5 mV is determined as a non-ignition state. During burning, thermocouple 2
The output voltage of No. 3 is monitored, and when the output voltage is lower than the reference voltage, each valve is closed to stop the combustion of the stove burner 10. The fire extinguishing control performs a fire extinguishing operation that closes each valve in accordance with the fire extinguishing operation of operation shooting 2.

When the ignition control is completed, the thermal power control unit 32
The heating power level is determined according to the operation of the operation shooting 2, and when each operation mode is selected, the temperature control is performed to adjust a predetermined heating power level corresponding to each operation mode, and the heating power is controlled. The level information is transmitted to the valve control unit 33. The heating power level determined by the operation shooting 2 has eight levels of levels 1 to 8, and is changed according to the above-mentioned encoder signal. The operation mode in the heating power control unit 32 is switched and set by each switch provided in the operation box 3, and is set as an operation mode with the operation of the cooking timer 32 a provided as a functional unit of the heating power control unit 32. There are three types of operation modes, a boiled mode described below by pressing the switch 3a, a timer cut mode in which the fire is automatically extinguished after a set time has elapsed, and a notification timer mode in which an alarm is issued after the set time has elapsed. The mode is sequentially and repeatedly switched each time the timer set switch 3a is pressed. In addition, by pressing the high temperature switch 3b, a fry mode in which the temperature of the food is controlled in accordance with the set temperature is selected.

In the fry mode, the set temperature is set at the same time when the fry mode is selected by operating the high temperature switch 3b. This set temperature is set when the power switch (not shown) is turned on and the fry mode is used for the first time. Is 1
After the temperature is set to 80 ° C. and once used, the temperature set in the previous frying mode is set as the current set temperature. In the deep-fried food mode, when the set temperature needs to be changed, pressing the high-temperature switch 3b or the low-temperature switch 3c once increases the temperature by + 10 ° C.
Alternatively, the temperature is changed by −10 ° C. in the range of 130 to 210 ° C. If the high temperature switch 3b or the low temperature switch 3c is kept pressed for 0.7 seconds or more during temperature setting, the temperature change of + 10 ° C. or −10 ° C. is repeated every 0.4 seconds, and the set temperature can be changed continuously.

The thermal power control unit 32 has a temperature control controller 32b for adjusting the thermal power level based on the temperature T detected by the temperature sensor 21. The temperature control is performed in the above-described stew mode and fried food mode (not shown). The temperature control is performed in the boiling mode and the rice cooking mode which are switched by the switch. Here, the temperature control in the boiled mode and the fried mode will be described with reference to FIGS. 5 and 6, respectively.

In the boiling mode, when ignition detection is performed in the ignition control, the heating power level based on the operation shot 2 is determined (step 11). Until the detected temperature T of the temperature sensor 21 reaches 105 ° C. (NO in Step 12), Step 11 is repeated to continue the heating power level based on the operation shot 2. When the detected temperature T becomes 105 ° C. or higher (YES in step 12), the cooking timer 32a set by a timer time set switch (not shown) starts measuring time (step 13). At this time, the heating power level is changed from the heating power level based on the operation shooting 2 to the minimum heating power level 1, and the heating power level 1 becomes 35.
For a second (step 14). Thereafter, the heating power level is changed from the heating power level 1 to the heating power level based on the operation shot 2 again, and this is continued for 5 seconds (step 15). Thereafter, steps 14 and 15 are repeated. When the cooking timer 32a finishes measuring the time in either step 14 or step 15, the process proceeds to fire extinguishing control. In each operation mode such as the cooking mode by operating the timer set switch 3a, if the time of the cooking timer 32a is not set, an error occurs after 15 seconds, and the fact is displayed and notified.

In the deep-frying mode, when an ignition is detected in the ignition control, the heating power level is determined based on the operation shot 2 (step 21). Until the detected temperature T of the temperature sensor 21 reaches the set temperature Tset + 4 ° C. (NO in Step 22), Step 21 is repeated to continue the heating power level based on the operation shot 2. Detection temperature T
Is equal to or higher than the set temperature Tset + 4 ° C. (step 22).
Is YES), the heating power level is changed from the heating power level based on the operation shooting 2 to the minimum heating power level 1 (step 23). Thereafter, until the detected temperature T of the temperature sensor 21 drops to the set temperature Tset-4 ° C. (Step 24)
NO), step 23 is repeated and the heating power level 1 is continued. When the detected temperature T of the temperature sensor 21 falls below the set temperature Tset−4 ° C. (YES in Step 24), the process proceeds to Step 21 and the operation shooting 2 is performed again.
Is changed to the heat power level according to the setting of. Thereafter, steps 21 to 21 are performed until the fire extinguishing operation by the operation shooting 2 is performed.
Repeat 24. The setting time of the cooking timer 32a and each operation mode can be switched before or after the ignition operation by the operation shooting 2, and each operation mode is started after the ignition is detected. Operate to release all. In the temperature control, predetermined disconnection check control for the temperature sensor 21 and high cut stop control based on the detected temperature are performed.

Next, the valve control section 33 will be described. The valve control unit 33 is a functional unit that mainly controls the current value of the gas proportional valve 14 according to the heating power level determined by the heating power control unit 32. In particular, in this embodiment, the solenoid valve 17 and the throttle solenoid valve 19 are within the range of the heating power level 2 to the heating power level 8.
On the other hand, at the thermal power level 1, the solenoid valve 17 is closed and only the throttle electromagnetic valve 19 is opened to restrict the gas amount by the orifice 18, so that the gas proportional valve 14 at the thermal power level 1 The current value I1 is set to a current value (for example, 50 mA) larger than the current value I2 (for example, 20 mA) at the heating power level 2, and is set to be the smallest at the heating power level 2.
The current value I of 4 is set to gradually increase from the heating power level 2 to the heating power level 8. Therefore, in the switching control between the heating power level 1 and the heating power level 2, the valve operating speed of the gas proportional valve 14 is easily affected by the difference between the case where the opening degree is large and the case where the opening degree is small. Therefore, different control operations are performed between the ignition operation before the ignition detection and the heating power control after the ignition detection, as described below.

At the time of the ignition operation, the ignition operation is performed by the operation shooting 2 in the point fire extinguishing control unit 31, and the throttle valve 19 is opened 0.5 S (seconds) after the original solenoid valve 13 is opened. The solenoid valve 17 is opened at the same time as the solenoid valve 19, and at this time, the current value of the gas proportional valve 14 is set to 0 mA. Thereafter, the current value of the gas proportional valve 14 is increased by 1 mA every 20 mS until the current value I5 corresponding to the thermal power level 5 is reached. When the stove burner 10 is ignited by the ignition operation, 0.5 seconds of the ignition detection in the ignition discrimination performed after 5S (second) has elapsed from the ignition operation.
After S, a current value changing operation for changing the current value I of the gas proportional valve 14 to a value corresponding to the heating power level based on the operation shot 2 is started. Also in this current value changing operation, the current value I of the gas proportional valve 14 is increased or decreased by 1 mA every 20 mS.

At the time of the thermal power control, if any one of the thermal power levels 2 to 8 is determined in accordance with the operation shot 2, the solenoid valve 17 and the throttle solenoid valve 19 are both opened and the gas proportional The current value of the valve 14 is controlled to a current value according to the determined heating power level, and when the heating power level is changed in the range from the heating power level 2 to the heating power level 8, when the heating power level is changed, The current value of the gas proportional valve 14 is changed according to the heating power level. On the other hand, at the heating power level 1, as described above, the solenoid valve 17 is closed to open only the throttle solenoid valve 19, and the current value I1 of the gas proportional valve 14 is changed to the current value I2 of the heating power level 2.
A larger current value (for example, 50 mA) is set. Further, when the thermal power level is changed between the thermal power level 1 and the thermal power level 2, as described above, the thermal power level 1 is reduced in order to reduce the influence of the valve operating speed of the gas proportional valve 14.
7, when the current value of the gas proportional valve 14 is instantaneously changed from I2 to I1 after 0.3S, the solenoid valve 17 is opened, and the heating power level is switched from the heating power level 2 to the heating power level as shown in FIG. In the case of switching to level 1, as shown in FIG. 8, the current value of the gas proportional valve 14 is instantaneously changed from I1 to I2 0.1S after the electromagnetic valve 17 is closed.
By performing each of the above switching control operations, fuel gas at each heating power level or higher is not supplied at each heating power level.

In the valve control section 33, the current value I of the gas proportional valve 14 corresponding to each heating power level is determined in advance for each type of gas used, and these are stored in a ROM (not shown) as current value data. The current value data that is stored and stored in the valve control unit 33 and is read is switched for each gas type by the gas type changeover switch 33a. The stored current value data at the thermal power level 1 and the thermal power level 2 indicate the current value I regardless of the gas type.
1. The current values I2 are 50 mA and 20 mA, respectively. At the thermal power levels 2 to 8, the current values I2 (20 mA) at the thermal power level 2 are increased from the current value I2 (20 mA) toward the thermal power level 8 at intervals of 9 to 22 mA (not necessarily constant intervals). For example, at the thermal power level 8, 76 mA for natural gas (TG), 112 mA for city gas (13 A), and 1 for LPG
It is 50 mA. The ignition circuit 30B is a well-known high voltage generation circuit that performs spark discharge at the ignition electrode 22, and the valve drive circuit 30C drives each valve according to a control signal of the valve control unit 33.

Next, an ignition operation in the gas table 100 according to the first embodiment of the present invention having the above-described configuration will be described with reference to FIG. When the ignition switch is turned on by performing the ignition operation by the operation shooting 2 (YES in step 101), the driving of the ignition circuit 30B, the operation of the ignition timer 31a, and the opening operation of the original electromagnetic valve 13 are started (step 102). ). After step 102, 0.5
The delay by the second timer is performed (step 103), and thereafter, the opening operation of each of the solenoid valves 17 and 19 is performed (step 10).
4) The current value of the gas proportional valve 14 which was 0 mA in the initial state is increased by 1 mA, and energization is started (step 1).
05). The heating power level in the ignition operation is heating power level 5
Is set, and it is determined whether or not the current value of the gas proportional valve 14 has reached the current value I5 corresponding to the heating power level 5. As a result of the determination, the current value I5 of the thermal power level 5
If not reached (N in step 106)
O), after performing a delay of 20 mS (step 107), proceed to step 105, and increase the current value of the gas proportional valve 14 again by 1 mA. The operation of increasing the current value of the gas proportional valve 14 by 1 mA every 20 ms is repeated until the current value I5 at the heating power level 5 is reached.

When the current value I5 at the heating power level 5 is reached (YES in step 106), ignition detection is performed based on the electromotive force of the thermocouple 23. In this case, the reference voltage for ignition detection is 2.5 mV. Since a low value is set, highly sensitive ignition detection is possible. If the output voltage of thermocouple 23 has not reached the reference voltage (NO in step 108), it is determined whether 10 seconds have elapsed since the start of the ignition operation, and 10 seconds have not elapsed. In the case (step 109
NO), and the process proceeds to step 108 to repeatedly determine whether the output voltage of the thermocouple 23 has reached the reference voltage until 10 seconds have elapsed. If the output voltage of the thermocouple 23 does not reach the reference voltage by 10 seconds after the start of the ignition operation (step 109)
YES), each valve is closed and the ignition circuit 30B is closed.
Is stopped to end the ignition operation (step 11).
0). When the output voltage of thermocouple 23 has reached the reference voltage (YES in step 108), if 5 seconds have elapsed since the start of the ignition operation (YES in step 111), driving of ignition circuit 30B is stopped ( Step 112). If 5 seconds have not elapsed since the start of the ignition operation (NO in step 111), the process waits until 5 seconds have elapsed, and when 5 seconds have elapsed, proceeds to step 112 to stop driving the ignition circuit 30B. I do. After step 112, a 0.5 second timer delay is performed (step 113). Thereafter, it is determined whether or not the current value of the gas proportional valve 14 is a current value corresponding to the heating power level based on the operation shot 2. If the current value is not the current value determined based on the operation shooting 2 (N in step 114
O), the current value is changed by 1 mA (step 11).
5) Wait for 20 ms (N in step 116)
O), after elapse of 20 ms (YE in step 116)
S), the process proceeds to step 114 to repeatedly determine the current value. When the current value of the gas proportional valve 14 reaches a current value corresponding to the heating power level based on the operation shot 2 (YES in step 114), the combustion is continued (step 1).
17) When each switch is operated as needed, the mode is switched to the operation mode corresponding to each switch.

By performing the above control operation, as shown in FIG. 9, the ignition circuit 30B operates reliably regardless of the output information of the thermocouple 23 for 5 seconds after the start of the ignition operation by the operation shooting 2. Therefore, in the case of a hot start in which the ignition operation is performed shortly after the combustion is stopped, even if the temperature of the thermocouple 23 is not sufficiently lowered, the operation of the ignition circuit 30B is not erroneously stopped. Therefore, a reliable ignition operation can be performed. In addition, in the hot start, since an erroneous operation based on the output information of the thermocouple 23 is not performed, the reference voltage for ignition detection can be set relatively low, and the sensitivity of ignition detection can be improved.

FIG. 10 shows an ignition control operation according to a second embodiment of the present invention. In the second embodiment, steps 201 to 207 correspond to step 10 in the first embodiment.
From 1 to 107, the same ignition operation as in step 107 is performed. When the current value of the gas proportional valve 14 is a current value corresponding to the heating power level based on the operation of the operation shooting 2 (YES in step 206), the ignition operation is performed. Until five seconds counted by the ignition timer 31a have elapsed from the start (NO in step 208), ignition determination based on the output voltage of the thermocouple 23 is not performed, and the ignition operation is started.
After the lapse of seconds (YE in step 208)
S), it is determined whether or not the output voltage of the thermocouple 23 has exceeded the reference voltage. If the output voltage of the thermocouple 23 has not reached the reference voltage (NO in step 209), the ignition operation is started. Until 10 seconds elapse (NO in step 210), step 2
09, 210, and 10 minutes after starting the ignition operation
If the output voltage of the thermocouple 23 does not reach the reference voltage before the lapse of seconds (Y in step 210)
ES), the valves are closed, and the operation of the ignition circuit 30B is stopped to end the ignition operation (step 211). If the output voltage of the thermocouple 23 has reached the reference voltage before 10 seconds have elapsed from the start of the ignition operation (YES in Step 209), Steps 212 to 216 are executed in Step 1 of the first embodiment.
In a predetermined sequence, the operation of the ignition circuit 30B is stopped and the change of the current value of the gas proportional valve 14 is controlled in a predetermined sequence in the same manner as in the steps 12 to 116, and the current value is changed to the current value corresponding to the heating power level based on the operation shot 2. After that (YES in step 214), thermal power control according to each operation mode is performed (step 217). According to the above control operation, in the second embodiment as well, the ignition detection based on the output voltage of the thermocouple 23 is not determined until 5 seconds have elapsed since the start of the ignition operation. Similarly to the above, in the hot start, a reliable ignition operation is performed, and the ignition detection sensitivity can be improved.

FIG. 11 shows the operation of the third embodiment of the present invention. In the third embodiment, apart from the above-described ignition detection, when the ignition operation is started, the output voltage of the thermocouple 23 is detected, and based on the output voltage, it is determined whether or not a hot start is performed. Thus, stop control of the ignition circuit 30B is performed. Hereinafter, the operation will be described. When the ignition operation is performed (YES in step 301), it is determined whether or not the output voltage of thermocouple 23 is equal to or higher than a determination voltage for determining whether or not hot start is performed. If the output voltage is equal to or higher than the determination voltage (YES in step 302), Judging that it was a hot start in which the re-ignition operation was performed shortly after the fire extinguishing operation,
Start the 3-second timer (step 30)
3) Start the operation of the ignition circuit 30B (step 30)
4). Thereafter, until the three-second timer finishes counting (NO in step 305), the operation waits while the ignition circuit 30B is operated, and when three seconds elapse (YES in step 305), the operation of the ignition circuit 30B is stopped. (Step 306). On the other hand, when the output voltage of thermocouple 23 does not reach the determination voltage (NO in step 302), the operation of only ignition circuit 30B is started without performing the above-described three-second timer (step 30).
7). Thereafter, it is determined whether or not the output voltage of the thermocouple 23 has reached a reference voltage for determining whether or not ignition has occurred. If the output voltage has not reached the reference voltage (step 3).
08), the operation time of the ignition circuit 30B is 10
Until the second is reached (NO in step 309), the determination in step 308 is repeated. Ignition circuit 30B
Ignition is carried out until the operation of more than 10 seconds,
When the output voltage of thermocouple 23 reaches the reference voltage (YES in step 308), the operation of ignition circuit 30B is stopped at that point (step 306). 1
If the output voltage of the thermocouple 23 does not reach the reference voltage before the time exceeds 0 seconds (YES in step 309), the operation of the ignition circuit 30B is stopped irrespective of ignition detection (step 306). In the valve control performed separately, each valve is closed, and the supply of the fuel gas is stopped. As described above, in the third embodiment, when the ignition operation is performed and the output voltage of the thermocouple 23 is a hot start, the ignition circuit 3 is controlled by the 3-second timer.
0B is forcibly operated, and the ignition circuit 30B
Operation does not stop.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining the operation of ignition control of a first embodiment of a gas table control device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an appearance of a gas table according to the embodiment of the present invention.

FIG. 3 is a schematic diagram showing a gas circuit in a gas stove of a gas table showing an embodiment of the present invention.

FIG. 4 is a block diagram showing a functional configuration of the gas table control device according to the embodiment of the present invention.

FIG. 5 is a flowchart for explaining the operation in the cooking mode in the control apparatus for the gas table according to the embodiment of the present invention.

FIG. 6 is a flowchart for explaining an operation in a frying mode in the control apparatus for the gas table according to the embodiment of the present invention.

FIG. 7 is a time chart for explaining the switching operation of the valve control from the heating power level 1 to the heating power level 2 in the control apparatus for the gas table according to the embodiment of the present invention.

FIG. 8 is a time chart for explaining a switching operation of the valve control from the heating power level 2 to the heating power level 1 in the control apparatus for the gas table according to the embodiment of the present invention.

FIG. 9 is a time chart for explaining the operation of ignition control of the first embodiment of the gas table control device according to the embodiment of the present invention.

FIG. 10 is a flowchart for explaining the operation of the ignition control of the second embodiment of the gas table control device according to the embodiment of the present invention.

FIG. 11 is a flowchart for explaining a control operation of an ignition circuit in ignition control of a third embodiment of the gas table control device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas stove (combustion equipment) 10 Stove burner (burner) 23 Thermocouple (thermoelectric element) 30B Ignition circuit (igniter) 31 Point fire extinguishing control unit (ignition control device of combustion equipment) 31a Ignition timer (timer)

Claims (2)

(57) [Claims] 1. A combustion apparatus which starts operation of an igniter provided in a burner to which fuel is supplied in connection with an ignition operation in association with the ignition operation, and stops operation of the igniter after a predetermined time. An ignition control device, comprising: a timer that starts in connection with the ignition operation and measures a predetermined time shorter than the predetermined time; and a thermoelectric generator that is heated by the burner. An ignition control device for a combustion device, which performs an ignition stop operation for stopping the operation of the igniter when the output voltage of the ignition device becomes higher than a predetermined voltage . 2. A combustion apparatus which starts operation of an igniter provided in a burner to which fuel is supplied in connection with an ignition operation in association with the ignition operation, and stops operation of the igniter after a predetermined time. An ignition control device, comprising: a thermoelectric element heated by the burner; and a timer for measuring a predetermined time shorter than the predetermined time, wherein the output voltage of the thermoelectric element during the ignition operation is lower than a predetermined voltage.
When high, actuates the timer actuates the igniter during the predetermined time measured, lower than the predetermined voltage
If have the output voltage of the heat generating element is the predetermined voltage
An ignition control device for a combustion device, wherein the operation of the igniter is stopped when the temperature becomes higher .