JPH06241460A - Gas cooker with grill - Google Patents

Abstract

PURPOSE:To accurately decide an igniting state of a burner. CONSTITUTION:An igniting state of a burner of a grill is detected by an ignition detector 2. An output of the detector 2 at the time of igniting the burner is stored in a memory 41. An arithmetic processor 43 reads the output of the detector 2 at the time of time-up of a timer 42. The processor 43 compares the output of the time-up time point of the detector 2 with the output stored in the memory 41 and identifies an igniting state of the burner. A display unit 3 displays the igniting state of the burner in response to the identified result. The igniting state of the burner is identified based on the output of the detector 2 at the time of igniting the burner to identify the igniting state of the burner by considering a temperature in a grill.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas cooker with a grill having a function of confirming and displaying an ignition state of a burner of a grill.

[0002]

2. Description of the Related Art In a gas cooker with a grill, it is difficult to easily judge the ignition state of the burner of the grill externally.
There is provided a device which detects the ignition state of the burner and displays the ignition state of the burner by a display unit such as a confirmation lamp. FIG. 3 shows a schematic configuration of a conventional gas cooker of this type. In this gas cooker, an operating section 1 for igniting the burner of the grill, an ignition detecting section 2 for detecting the ignition state of the burner, a display section 3 for displaying the ignition state of the burner, and an output of the ignition detecting section 2. The control unit 4 determines the ignition state of the burner and controls the display of the display unit 3.

In the gas cooker of this type, when the burner is ignited by the operating unit 1, the control unit 4 determines from the output of the ignition detecting unit 2 that the burner has been ignited, and the display unit 3 ignites. Make the display. At this time, when the burner is not ignited despite performing the ignition operation, the control unit 4 does not display anything on the display unit 3,
Notify the user that the burner is in the non-ignition state. For example, when a confirmation lamp is used as the display unit 3, the ignition state is displayed by turning on the confirmation lamp, and the non-ignition state is displayed by turning off the confirmation lamp.

[0004]

A conventional gas cooker of this type uses a thermocouple as the ignition detecting section 2. This thermocouple detects the presence or absence of a flame from the temperature, and the thermoelectromotive force changes according to the temperature inside the grill.
Then, the control unit 4 determines the ignition of the burner because the output of the thermocouple is equal to or greater than a predetermined value.

By the way, due to the structure of the grill, it takes a considerable time for the temperature inside the grill to drop after the combustion of the burner is stopped as shown in FIG. 4 (the extinguishing time is indicated by t ₀ in the figure). . For this reason, when the thermocouple is used as the ignition detection unit 2, the output of the thermocouple, which changes with the temperature in the grill, takes a considerable amount of time to return to the state before ignition.

[0006] Now, when the temperature of the inside of the grill is as high as when the burner is ignited and the grill is reused, the thermocouple produces an output similar to that at the time of ignition. Therefore, even if the burner is in the non-ignition state, the control unit 4 makes an erroneous determination that the burner is in the ignition state, and causes the display unit 3 to perform the ignition display. That is, conventionally, when the output of the ignition detection unit 2 after ignition is equal to or more than a predetermined value, it is determined that the ignition state is set, and thus such a malfunction occurs. Therefore, the original purpose of the display unit 3 for displaying the ignition state of the burner could not be achieved.

The present invention has been made in view of the above points, and an object of the present invention is to accurately ignite the burner even if the grill is reused when the temperature inside the grill is high. It is to provide a gas cooker with a grill that can be identified.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an operating portion for igniting a burner of a grill, an ignition detecting portion for detecting an ignition state of the burner of the grill, and an ignition of the burner. A display unit for displaying the state and a control unit for determining the ignition state of the burner from the output of the ignition detection unit after the ignition operation and performing the ignition display on the display unit, and the ignition detection unit during the ignition operation of the burner are provided. The burner compares the output of the ignition detection unit and the output stored in the storage unit with the storage unit that stores the output, the time counting unit that counts a fixed time from the ignition operation, and the output of the ignition detection unit when the above-mentioned time counting has elapsed. The above-mentioned control unit is constituted by the discrimination means for discriminating the ignition state.

In order to enable more accurate burner ignition detection, the determination means determines the temperature in the grill during the ignition operation from the output of the ignition detection portion during the ignition operation of the burner. The output of the ignition detection unit at the time of ignition operation is multiplied by a predetermined coefficient preset according to the temperature in the grill at the time of ignition operation, and when the time measured by the time measuring means in the ignition state of the burner elapses. It is preferable to determine the determination value for determining the ignition state of the burner, and compare the actual output of the ignition detection unit at the time when the time counting time has elapsed with the determination value to determine the ignition state of the burner.

[0010]

The present invention is configured as described above, and based on the output of the ignition detection unit at the time when the ignition operation of the burner is performed,
By determining the ignition state of the burner, it is possible to determine the ignition state of the burner in consideration of the temperature inside the grill, and it is possible to accurately determine the ignition state of the burner.

Further, the change in the output of the ignition detection unit after a certain period of time is predicted in consideration of the temperature in the grill during the ignition operation, and the judgment value and the time measured at the time when the judgment value set based on the prediction is elapsed. By comparing the ignition output of the burner by comparing it with the actual output of the ignition detection unit, it is possible to determine the ignition state of the burner from the output change of the ignition detection unit after ignition operation. It is possible to detect the ignition of.

[0012]

【Example】

(Embodiment 1) FIG. 1 shows an embodiment of the present invention. The grill-equipped gas cooker of the present embodiment is basically the same as the conventional grill-equipped gas cooker described in FIG. 2, and the feature of the present embodiment lies in the configuration of the control unit 4. is there.

In the present embodiment, the control section 4 includes a memory 41 as a storage means for storing the output of the ignition detection section 2 at the time of ignition operation of the burner, and a timer as a time measurement means for measuring a fixed time from the ignition operation. 42 and the output of the ignition detection unit 2 at the time when the time measured by the timer 42 has elapsed and the output stored in the memory 41, and an arithmetic processing unit 43 as a determination unit for determining the ignition state of the burner. And a drive unit 44 as a drive unit for driving the display unit 3 in accordance with the ignition determination result of the burner. That is, as is apparent from the configuration of FIG. 1, the control unit 4 is configured by a microcomputer in this embodiment. If the display unit 3 requires a large drive current, the drive unit 44 may be provided separately from the microcomputer.

The operation of this embodiment will be described below. In addition,
A thermocouple is used as the ignition detection unit 2 and the display unit 3 is configured by a confirmation lamp. Further, when the detected temperature of the thermocouple increases, the thermoelectromotive force increases and the output thereof increases. I do. When the ignition operation is performed by the operation unit 1, a signal indicating that the ignition operation is performed is input to the arithmetic processing unit 43 of the control unit 4. At this time, the arithmetic processing unit 4
In 3, the output at the time of ignition is read from the ignition detection unit 2 and the output is stored in the memory 41. At the same time, timer 4
Start the time delay operation of 2. Here, the time limit of the timer 42 may be a short time of about several seconds.

When the timer 42 has timed out, the arithmetic processing unit 43 reads the output of the ignition detection unit 2 again and compares the read output with the output stored in the memory 41 to obtain the ignition. The output difference of the ignition detection unit 2 between the time point and the time point when a fixed time has elapsed is obtained. This output difference indicates a change tendency (an upward tendency or a downward tendency) of the ignition detection unit 2 for a certain period of time. Therefore,
The arithmetic processing unit 43 determines that the burner is in the ignition state if the upward tendency is shown, and causes the display unit 3 to display the ignition state of the burner (turn on the confirmation lamp).

On the contrary, when the downward tendency is shown (including the state where there is no change), it is determined that the burner is in the non-ignition state, and the display of the burner in the display section 3 indicating that the burner is in the non-ignition state is displayed. Let's do it (do not turn on the confirmation lamp). here,
In the simplest case, rather than the output of the ignition detection unit 2 at the time of ignition,
The burner is in the ignition state when the output is large after the elapse of a certain time, and when the output is small or the same, it is determined that the burner is in the non-ignition state.

With this configuration, the ignition state of the burner can be determined based on the output of the ignition detection unit 2 at the time when the ignition operation of the burner is performed, and the temperature of the inside of the grill is taken into consideration. Since the ignition state is determined, the ignition state of the burner can be determined more accurately than in the conventional case. By the way, in the above description, when the output of the ignition detection unit 2 at the time when the timer 42 times up is the same as the output at the time of ignition, it is determined that it is in the non-ignition state. Depending on the positional relationship between the burner and the thermocouple, which is the ignition detection unit 2, the output change of the ignition detection unit 2 is gentle even when the burner is in the ignition state.
A situation may occur in which the output of the ignition detection unit 2 at the time of time-up is the same as the output at the time of ignition, or in some cases slightly lower.

Therefore, the output of the ignition detection unit 2 at the time when the timer 42 times out is slightly different from the ignition detection unit 2 at the time of ignition.
Even if the output is lower than the output of, the ignition may be determined. In the non-ignition state, the output of the ignition detection unit 2 does not reach the slightly low state described above, and the output of the ignition detection unit 2 surely decreases, indicating a lower output state. However, there is practically no problem.

(Embodiment 2) FIG. 2 shows another embodiment of the present invention. In this embodiment, the control unit 4 is provided with a grill temperature discriminating unit 45 as a temperature discriminating unit for discriminating the temperature in the grill at the time of ignition operation from the output of the ignition detection unit 2 at the time of ignition operation of the burner. It is characterized in that it is possible to make more accurate ignition determination than in the first embodiment.

In the present embodiment, in order to perform the ignition determination more accurately, the ignition determination is performed based on the output change state of the ignition detection unit 2 in the ignition state of the burner in consideration of the temperature in the grill. Specifically, an output change of the ignition detection unit 2 after the burner is ignited with respect to the temperature inside the grill during the ignition operation is experimentally obtained, and a determination is made to appropriately determine whether or not the output change is in an ignition state. By determining a value and comparing this determination value with the output of the ignition detection unit 2 when the timer 42 times out, ignition determination is performed.

Here, the coefficient obtained by multiplying the output of the ignition detection unit 2 at the time of the ignition operation by the determination value according to the temperature in the grill at the time of the ignition operation may be determined in advance from the above experimental results. That is, the output change of the ignition detection unit 2 after ignition of the burner changes according to the temperature in the grill during ignition operation, so the coefficient is changed as described above. As a result, the coefficient is set in consideration of the change in the output of the ignition detection unit 2 during the fixed time after ignition. In order to make such an ignition determination, it is necessary to determine the grill temperature at the time of ignition operation in advance. Therefore, in the present embodiment, the grill temperature determination unit 45 is provided.

For example, when a thermocouple is used as the ignition detection unit 2 and the temperature inside the grill is low during ignition operation,
The rising speed of the output of the ignition detection unit 2 after ignition is fast. vice versa,
When the temperature inside the grill is high, that is, when the grill is reused while the temperature inside the grill is high, the rate of rise of the temperature inside the grill becomes slow. This is because the temperature inside the grill has almost reached the saturation state immediately after extinguishing the fire.

By the way, it is conceivable to set the coefficient finely according to the temperature in the grill, but the change state of the output of the ignition detection unit 2 is affected by the change of the surrounding environment of the gas cooker or the change over time. Since it may change itself, even if the coefficient is set too finely, it may cause malfunction. Therefore, in the present embodiment, the temperature inside the grill is roughly divided from the output of the ignition detection unit 2 at the time of ignition, and the coefficient is set for each divided temperature range. For example, a coefficient may be set depending on whether the temperature inside the grill is low or high.

At the time of ignition, the judgment value is determined by multiplying the output of the ignition detection unit 2 which has read the coefficient corresponding to the temperature in the grill at that time. Then, the calculated value is stored in the memory 41.
Remember. When the output of the ignition detection unit 2 is read at the time when the timer 42 is up, whether the output is larger than a value obtained by multiplying the output of the ignition detection unit 2 at the time of ignition by a predetermined coefficient, that is, a determination value. To judge. When the output after the elapse of a certain period of time is larger than the determination value, the arithmetic processing unit 43 determines that it is in the ignition state.

As described at the end of the first embodiment, depending on the structure of the grill, for example, the positional relationship between the burner and the thermocouple which is the ignition detection unit 2, even if the burner is in the ignited state, the ignition is ignited. The output change of the detection unit 2 is gradual,
A situation may occur in which the output of the ignition detection unit 2 at the time of time-up is the same as the output at the time of ignition, or in some cases slightly lower.

Therefore, the coefficient at high temperature may be set to 0.8, for example, so that such a situation can be detected as ignition. The coefficient at constant temperature may be 1.2, for example. Needless to say, these coefficients may be properly set according to the grill to which the present invention is applied. In this way, the ignition determination can be performed from the output change state of the ignition detection unit 2 that takes the temperature inside the grill into consideration, and the ignition state can be detected more accurately. In the above-described case, the target value was obtained in advance and stored in the memory 41, but the output of the ignition detection unit 2 at the time of ignition is stored in the memory 41, and when the timer 42 is up, the memory 41 outputs the target value. The read value of the ignition detection unit 2 may be multiplied by a coefficient to calculate a determination value, and the comparison process may be performed.

By the way, in the above-mentioned case, although the confirmation lamp of the display unit 3 does not display anything until the timer 42 times out after ignition, during this period, the display of the ignition determination process is displayed. It is preferable to inform the user that ignition detection is being performed. For example,
When a confirmation lamp is used as the display unit 3, the confirmation lamp may be made to blink. Further, at the time of misfire, an alarm buzzer or an alarm lamp provided separately from the confirmation lamp may be used to notify the misfire state.

[0028]

As described above, the present invention has an operation section for performing ignition operation of the burner of the grill, an ignition detection section for detecting the ignition state of the grill burner, and a display section for displaying the ignition state of the burner. A control unit for determining the ignition state of the burner from the output of the ignition detection unit after ignition operation and performing ignition display on the display unit, and a storage unit for storing the output of the ignition detection unit during the ignition operation of the burner, A discriminating means for discriminating the ignition state of the burner by comparing the time measuring means for measuring a fixed time from the time of ignition operation with the output of the ignition detecting section at the time when the time measuring time has elapsed and the output stored in the storage means. The control unit is configured with, and by determining the ignition state of the burner based on the output of the ignition detection unit at the time of performing the ignition operation of the burner, the temperature of the inside of the grill is taken into consideration and the burner It is possible to determine the ignition state , It is therefore possible to accurately determine the ignition state of the burner.

Further, the discriminating means includes a temperature discriminating means for discriminating the temperature inside the grill during the ignition operation from the output of the ignition detecting portion during the ignition operation of the burner, and the temperature discriminating means according to the temperature inside the grill during the ignition operation. By multiplying the output of the ignition detection unit at the time of ignition operation by a predetermined coefficient that is set in advance, a determination value for determining the ignition state of the burner at the time when the time measured by the time measuring means in the ignition state of the burner is obtained, and the time measured Comparing the output of the actual ignition detection unit and the above determination value at the time of,
By determining the ignition state of the burner, the ignition state of the burner can be determined from the output change of the ignition detection unit after the ignition operation, and thus the ignition of the burner can be detected more accurately.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing the configuration of another embodiment.

FIG. 3 is a block diagram showing a configuration of a conventional example.

FIG. 4 is an output characteristic diagram of the thermocouple after combustion of the burner is stopped.

[Explanation of symbols]

 1 Operation Section 2 Ignition Detection Section 3 Display Section 4 Control Section 41 Memory 42 Timer 43 Calculation Processing Section 45 Grill Temperature Discrimination Section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akito Hayano 1-152 Minami-shi Oka, Minato-ku, Osaka City Harman Co., Ltd.

Claims (2)

[Claims] 1. An operating unit for igniting a burner of a grill, an ignition detecting unit for detecting an ignition state of the grill burner, a display unit for displaying an ignition state of the burner, and an ignition detecting unit after ignition operation. It is equipped with a control unit that determines the ignition state of the burner from the output and performs ignition display on the display unit, a storage unit that stores the output of the ignition detection unit during the ignition operation of the burner, and a fixed time from the ignition operation. The control unit is configured by a time measuring unit that determines the ignition state of the burner by comparing the output of the ignition detection unit and the output stored in the storage unit when the time period elapses. Gas cooker with a grill characterized by consisting of: 2. The determining means comprises temperature determining means for determining the temperature in the grill during the ignition operation from the output of the ignition detecting portion during the ignition operation of the burner, and the temperature determining means determines the temperature in the grill during the ignition operation. By multiplying the output of the ignition detection unit at the time of ignition operation by a predetermined coefficient that is set in advance, a determination value for determining the ignition state of the burner at the time when the time measured by the time measuring means in the ignition state of the burner is obtained, and the time measured 2. The ignition state of the burner is determined by comparing the actual output of the ignition detection unit and the determination value at the time point of.
Gas cooker with grill as described.