KR100686744B1 - Warm drawer temperature control method of a oven range - Google Patents

Abstract

The present invention relates to a method for controlling the temperature of the drawer of the oven range, the step of comparing the temperature of the heat drawer and the set temperature (a), and if it is determined that the temperature of the heat drawer is lower than the set temperature (a) The temperature of the drawer is increased by controlling the on / off of the heater, and if the temperature of the drawer is determined to be equal to or higher than the set temperature, the temperature of the drawer is maintained by controlling the on / off of the heater by the heater temperature control method. Characterized in that it comprises a step. Therefore, it is possible to prevent the temperature rise phenomenon that occurred in the temperature rise section.

Microwave Oven, Thermal Drawer, Heater, On / Off Cycle, On Rate, Temperature Rise

Description

Warm drawer temperature control method of a oven range}

1 is a cross-sectional view showing a general oven with a heat drawer.

FIG. 2 is a view illustrating a heat insulation drawer separately in a general oven with a heat drawer, wherein (a) is a plan view and (b) is a side view.

3 is a diagram illustrating a temperature control configuration of a thermal drawer using a thermistor.

Figure 4 is a graph showing the change in temperature with the operating time of the thermal drawer.

5 is a graph showing a temperature change with time in the process of raising the temperature of the heat-insulated drawer to the set temperature by the method of controlling the heat-extracting drawer temperature of the oven range according to the present invention.

6 is a graph illustrating a temperature change according to time for each set temperature in the process of increasing the temperature of the drawer to the set temperature by the method of controlling the drawer temperature of the oven range according to the present invention.

7 is a flowchart illustrating a method of controlling a drawer temperature of an oven range according to the present invention.

* Explanation of symbols for main parts of drawings *

50: outer case 52: heat insulation drawer heater

54: thermistor 60: thermal drawer

70: key input unit 80: micom

90: switch

The present invention relates to a method for controlling an oven range, and in particular, in an oven having a heat drawer, in the process of raising the temperature of the heat drawer to a preset temperature, controlling the on / off of the heater to the preset temperature. The present invention relates to a method for controlling the temperature of a drawer of an oven range in which the temperature of the temperature of the heat drawer is prevented from being raised excessively higher than the set temperature.

Oven ranges are equipped with an oven unit, a grill unit, and a top burner unit all in one apparatus, so that various dishes can be cooked individually or simultaneously, and thus the use of the oven range is gradually increasing in homes and businesses. Recently, as a US Patent No. US 6,191,391, the development of a technology for adding a warm drawer (warm drawer) to the existing oven range that stores the food in the warm state or to keep the dishes, forks, knives, etc. It is done.

1 is a cross-sectional view showing a general oven with a heat drawer.

An electric oven 10 mainly for barbecue cooking is installed at the lower side of the oven range 1 using vertical heating power and tropical flow, and the cooked food or various dishes are kept at the upper side of the electric oven 10. Insulating drawer 20 is installed, the top of the warm drawer 20 is provided with a top burner portion 30 is provided so that a plurality of burners for heating the container containing the food is exposed to the upper side. The rear of the oven range 1 is equipped with a back guard 40 for discharging the exhaust gas generated from the electric oven 10 and the top burner 30 to the outside, and the rear of the electric oven 10. The barbecue motor (not shown) and the convection motor (not shown) are installed. At this time, the burners of the top burner unit 30 may be configured as a general gas burner, or may be configured as a radiation burner using electricity or gas.

The warm drawer 20 is a device for warming and keeping cooked food in the electric oven 10 or the top burner unit 30 or keeping warm the dishes, forks, knives and the like used in a meal. The heater 22 is provided in the bottom part in order to maintain the heat retention temperature.

FIG. 2 is a view illustrating a thermal insulation drawer separately in a general oven with a thermal drawer, in which (a) is a plan view, (b) is a side view, and FIG. 3 is a temperature control configuration of a thermal drawer using a thermistor. It is also.

The thermal insulation drawer 60 is slidable in front and rear of the microwave oven in the thermal insulation drawer outer case 50 integrated with the oven range, and the upper side thereof is open to store or take out dishes. It is inserted in the form of a general drawer. The outer case 50 below the thermal drawer 60 is equipped with a heater 52 for maintaining the inside of the thermal drawer 60 at a warming temperature, and the temperature of the heater 52 is located on the side of the heater 52. Equipped with a thermistor for measuring

When the user presses a button for keeping warm drawers (not shown) provided in the key input unit 70, a signal generated by pressing the button is transmitted to the microcomputer 80. The microcomputer 80 analyzes the signal transmitted from the key input unit 70 to control the switch 90 to adjust the on / off of the heater 52. At this time, the thermistor 54 measures the temperature of the heater 52 and transmits the value to the microcomputer 80, the microcomputer 80 is transmitted from the key input unit 70 and the temperature value received from the thermistor 54 The switch 90 is controlled based on the on signal. That is, when the temperature value measured by the thermistor 54 is higher than the set temperature, the switch 90 is turned off. When the temperature value measured by the thermistor 54 is lower than the set temperature, the switch 90 is turned on. By turning on, the internal temperature of the thermal insulation drawer 60 is maintained at a set temperature.

At this time, the microcomputer 80 receives the temperature value measured by the thermistor 54 as the temperature inside the thermal drawer 60 and adjusts the set temperature. In reality, the thermistor 54 lowers the thermal drawer 60. It is difficult to accurately measure the temperature inside the thermal drawer 60 because it is mounted on. Therefore, in general, it is determined that there is a constant relationship between the temperature value measured by the thermistor 54 and the actual temperature value inside the thermal insulation drawer 60 so that it can be corrected by an arbitrary correction equation. The temperature inside the thermal insulation drawer 60 is calculated by taking a constant correction equation to the temperature value measured by the same.

In this case, however, in the process of operating the heater 52 of the thermal insulation drawer 60 to raise the temperature therein and setting the temperature to a preset temperature, the actual thermal insulation drawer cannot be corrected by the above correction equation. 60) A section in which the internal temperature rises sharply higher than the temperature measured by the thermistor 54 occurs.

Figure 4 is a graph showing the change in temperature with the operating time of the thermal drawer.

In the graph of FIG. 4, line (a) shows the temperature of the thermal drawer measured by the thermistor, and line (b) shows the actual temperature inside the thermal drawer. Referring to this, it can be seen that there is a constant difference between the actual temperature of the drawer and the temperature measured by the thermistor. However, this difference maintains a constant proportionality in the temperature maintaining section L2 in which the temperature of the warming drawer maintains the set temperature, but is proportional to the above proportion in the temperature rising section L1 in which the temperature of the warming drawer rises to the set temperature. Without showing a relationship, it can be seen that the temperature of the actual heat drawer suddenly rises above the temperature measured by the thermistor, causing an overshooting period.

The over-rising section (a) is a section that inevitably occurs in the process of raising the temperature of the drawer to the set temperature, and continuously turns on the heater until the temperature value measured by the thermistor reaches the set temperature. Is generated by a control process. This process, in which the actual temperature of the thermal drawer rises sharply higher than the temperature measured by the thermistor, not only may the food stored in the thermal drawer be spoiled, and the taste may be deteriorated.

Therefore, there is a need for a method of controlling the on / off of the heater so that the initial rising section as described above does not appear when the temperature of the warm drawer is raised to the set temperature.

An object of the present invention is to provide a method for controlling the temperature of the drawer of the oven range which can prevent the actual temperature of the heat drawer from excessively rising in the temperature rise section when the temperature of the heat drawer is raised to the set temperature.

In order to achieve the above object, the method of controlling the temperature of the drawer of the oven range according to the present invention includes comparing the temperature of the heat drawer and the set temperature (a), and the temperature of the heat drawer is greater than the set temperature (a). If it is determined that the low, it characterized in that it comprises the step of raising the temperature of the thermal drawer by controlling the on / off of the heater in the heater time control scheme.

At this time, if it is determined that the temperature of the thermal drawer is higher than or equal to the set temperature, it is preferable to control the on / off of the heater by the heater temperature control method, and in the step of raising the temperature of the thermal drawer, the set temperature (a It is preferable to control the on / off time of the heater so that the ratio (on ratio) of the on time occupies in the heater on / off cycle becomes larger as the value increases.

Therefore, according to the present invention, it is possible to prevent the temperature rise phenomenon that occurred in the conventional temperature rise period, and to control the temperature rise rate by varying the on ratio according to the set temperature when controlling the on / off of the heater. The time it takes for the temperature of the warm drawer to reach the set temperature can be arbitrarily adjusted.

Hereinafter, with reference to the accompanying drawings, it will be described in more detail with respect to the method of controlling the drawer temperature of the oven range according to the present invention.

To prevent the actual temperature of the thermal drawer from excessively rising in the temperature rise section when the temperature of the thermal drawer is raised to the set temperature, the control method according to the present invention, first, the process of raising the temperature of the thermal drawer to the set temperature; Unlike the conventional control method in which the heater is kept on until the temperature value measured by the thermistor reaches the set temperature, the controller periodically controls the on / off of the heater. While increasing the temperature of the drawer to the set temperature, characterized in that.

5 is a graph showing a temperature change with time in the process of raising the temperature of the heat-insulated drawer to the set temperature by the method of controlling the heat-extracting drawer temperature of the oven range according to the present invention.

Referring to this, even in a temperature rise section L1 in which the temperature of the thermal drawer reaches the set temperature, the heater on / off is controlled as in the temperature maintenance section L2 in which the temperature of the thermal drawer reaches the set temperature. It can be seen that. In the section where the heater is on (section in which the slope of the graph rises), the temperature of the drawer rises, and in the section in which the heater is off (section in which the slope of the graph falls), the temperature of the drawer drops. do.

At this time, when the on / off period P of the heater is the same in the temperature rising period L1, the ratio of the on time in the on / off period of the heater (hereinafter, referred to as 'on ratio') Increasing the temperature rise slope may be increased than the slope shown in FIG. 5, and thus, it may be seen that the time taken to raise the temperature of the warming drawer to the set temperature may be shorter than the time shown in FIG. have.

On the other hand, it can be seen that the temperature rise section (a of FIG. 4) does not occur in the temperature rise section L1 as in the prior art, which conventionally turns on the heater throughout the temperature rise section (L1 in FIG. 4). In the present invention, the temperature of the drawer is increased to the set temperature by turning off the heater only when it is determined that the temperature value measured by the thermistor is equal to the set temperature. By controlling the on / off of the heater throughout the temperature rise section L1 where the temperature reaches the set temperature, the temperature rise section as in the prior art does not occur.

6 is a graph illustrating a temperature change according to time for each set temperature in the process of increasing the temperature of the drawer to the set temperature by the method of controlling the drawer temperature of the oven range according to the present invention. The higher the value, the shorter the time it takes to reach the set temperature.

Graph (a) shows the temperature change with time when the set temperature is 60 ℃, graph (b) when the set temperature is 70 ℃, and graph (c) when the set temperature is 80 ℃, Referring to this, when the on / off period P of the heater is the same regardless of whether the set temperature is high or low, the higher the on ratio of the heater is, the shorter the time for reaching the set temperature is. Can be.

Regardless of whether the set temperature is high or low, if the on / off of the heater in the temperature rise section is controlled by the on ratio shown in the graph (a), the time to reach the set temperature (that is, the temperature rise time) when the set temperature is increased is also displayed in the graph ( It is common to be longer than the time of a). In this case, the temperature rise in the temperature rise section can be prevented, but the time taken for the temperature of the warm drawer to reach the set temperature becomes long, which causes inconvenience. Therefore, in the present invention, as the set temperature is increased, the on rate of the heater is also increased to shorten its arrival time. That is, in the present invention, the temperature rising slope can be controlled by adjusting the on rate of the heater for each set temperature, and as a result, the length and time of the time required to raise the temperature of the warming drawer to the set temperature can be controlled.

At this time, as the on ratio is increased, the temperature increase range becomes larger when the set temperature is reached (h3> h2> h1) (but significantly smaller than in the prior art). It is preferable to adjust suitably in consideration.

7 is a flowchart illustrating a method of controlling a drawer temperature of an oven range according to the present invention.

The thermal drawer temperature control method according to the present invention proceeds in two steps. First, the first step is a heater time control step of raising the temperature of the warming drawer to the set temperature, the second step is a heath temperature control step of maintaining the temperature of the warming drawer at the set temperature.

In this case, the heater time control is a method of controlling the on / off of the heater in time, and the heater temperature control is a method of controlling the on / off of the heater based on the temperature measured by the thermistor. If you set the heater on time to 20 seconds and the heater off time to 15 seconds, it automatically turns off after 20 seconds after turning on the heater, and automatically turns on again after 15 seconds after turning off the heater. While controlling the temperature of the drawer repeatedly, the heater temperature control automatically turns off the heater when the temperature value measured by the thermistor is higher than the set temperature, and automatically when the temperature value measured by the thermistor is lower than the set temperature. Repeatedly turning on the heater to control the temperature of the drawer.

In the present invention, the temperature of the thermal drawer is increased to a set temperature by employing a heater time control method in a temperature rising section, and the temperature of the thermal drawer is maintained at a set temperature by employing a heater temperature control method in a temperature maintaining section.

Hereinafter, the process will be described in detail with reference to the flowchart.

After the warming drawer starts to operate by the user's key input signal (step S100), if the setting temperature (a) of the warming drawer is set (step S110), the control unit of the oven range measures the temperature and setting measured by the thermistor. After comparing the temperature (a) (step S120), if it is determined that the measured temperature is lower than the set temperature (a), it starts to control the on / off of the heater by the heater temperature time control method (step S130).

First, when it is determined that the set temperature (a) is applied to T1, for example, 60 ° C. (step S140), when it is determined that the temperature is 60 ° C., the on / off cycle of the heater is set to P seconds, for example, 35 seconds, and the heater is turned on. The ratio is set to A, for example 20/35, to control on / off of the heater (step S150). That is, after 20 seconds after turning on the heater, it is automatically turned off, and when 15 seconds after turning off, the on / off control is automatically performed to repeatedly turn on the heat drawer. Let's do it.

At this time, the thermistor continuously measures the temperature of the thermal drawer periodically, and after some time has passed since the on / off control of the heater is started, it is determined that the temperature measured by the thermistor is higher than or equal to the set temperature (a). In step S120, the controller changes the on / off control method of the heater from the heater time control method to the heater temperature control method, thereby maintaining the temperature of the warm drawer at the set temperature (step S210).

On the other hand, if it is determined in step S140 that the set temperature (a) is not T1, after determining whether to apply T2, for example, 70 ° C. (step S160), and if it is determined that the temperature is 70 ° C., the P / S cycle of the heater is P seconds. For example, it is set to 35 seconds, and the on / off of the heater is controlled by setting the on ratio of the heater to B, for example, 23/35 (step S170). That is, 23 seconds after turning on the heater automatically turns it off, and after 12 seconds after turning off, the on / off control is automatically performed to repeatedly turn on the heating drawer. Let's do it. At this time, since the set temperature T2 is higher than the set temperature T1, the heater on ratio is also higher than when the set temperature is T1 (B > A), thereby increasing the temperature of the warm drawer faster than when the set temperature is T1. That is, the slope of the temperature rise in the temperature rise section is increased.

Subsequently, if it is determined in step S160 that the set temperature (a) is not T2, after determining whether to apply T3, for example, 80 ° C. (step S180), if it is determined that the temperature is 80 ° C., the on / off cycle of the heater is P. The seconds are set to 35 seconds, and the on / off ratio of the heater is controlled to C, for example 26/35, to control the heater on / off (step S190). That is, after 26 seconds after turning on the heater, it is automatically turned off, and after 9 seconds after turning off, the on / off control is automatically repeated to turn on the heater to heat the drawer. Let's do it. At this time, since the set temperature T3 is higher than the set temperature T2, the heater on ratio is also higher than when the set temperature is T2 (C > B), thereby increasing the temperature of the thermal drawer faster than when the set temperature is T2.

On the other hand, if it is determined in step S160 that the set temperature (a) is not T3, the control unit determines that the set temperature (a) is T4, for example 90 ° C (step S180), P / S, the on / off cycle of the heater, For example, it is set to 35 seconds, and the on / off ratio of the heater is controlled to D, for example, 30/35, to control on / off of the heater (step S200). That is, 30 seconds after the heater is turned on, it is automatically turned off, and when 5 seconds after the off, the on / off control is automatically repeated to turn on the heater to heat the drawer. Let's do it. At this time, since the set temperature T4 is higher than the set temperature T3, the heater on ratio is also higher than when the set temperature is T3 (D > C), thereby increasing the temperature of the warm drawer faster than when the set temperature is T3.

At this time, in the process of proceeding with the steps S170, S190 and S200, the thermistor continuously measures the temperature of the thermal drawer periodically, if it is determined that the temperature measured in the thermistor is higher than or equal to the set temperature (a) (step S120) The controller proceeds to maintain the temperature of the warm drawer at the set temperature by changing the on / off control method of the heater from the heater time control method to the heater temperature control method (step S210).

 According to the method of controlling the temperature of the drawer of the oven range according to the present invention, in the temperature rise section for raising the temperature of the heat drawer to the set temperature, the heater time is controlled on / off by the heater time control method, and the temperature of the heat drawer is the set temperature. In the temperature maintenance section after reaching to, the heater on / off is controlled by the heater temperature control method.

According to this, unlike the conventional method in which the heater is kept on continuously until the temperature value measured by the thermistor reaches the set temperature, the temperature of the thermal drawer is increased by periodically turning the heater on and off. It is possible to prevent the temperature rise that occurred in the temperature rise section.

In addition, when controlling the on / off of the heater to control the temperature rise rate by varying the on ratio according to the set temperature, it is possible to arbitrarily adjust the time it takes for the temperature of the drawer to reach the set temperature.

Claims (3)

Comparing the temperature of the thermal drawer with the set temperature; And If it is determined that the temperature of the thermal drawer is lower than the set temperature, it comprises the step of raising the temperature of the thermal drawer by controlling the on / off of the heater in a heater time control method to repeatedly turn on / off the heater at a predetermined cycle How to control the temperature of the drawer of the oven range. The method of claim 1, If it is determined that the temperature of the thermal drawer is higher than or equal to the set temperature, further comprising the step of controlling the on / off of the heater in a heater temperature control method that compares the temperature measured in the thermistor for measuring the temperature of the heater with the set temperature; Thermal insulation drawer temperature control method of the microwave oven characterized by the above-mentioned. The method of claim 1, In the step of raising the temperature of the thermal drawer, the on / off time of the heater is controlled so that the higher the set temperature, the larger the ratio (on ratio) of the on time in the heater on / off cycle becomes. How to control the temperature of the drawer in the oven range.

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