CN114766905A - Control method of pressure cooking appliance - Google Patents
Control method of pressure cooking appliance Download PDFInfo
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- CN114766905A CN114766905A CN202210272013.9A CN202210272013A CN114766905A CN 114766905 A CN114766905 A CN 114766905A CN 202210272013 A CN202210272013 A CN 202210272013A CN 114766905 A CN114766905 A CN 114766905A
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- 238000010411 cooking Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 53
- 238000010586 diagram Methods 0.000 claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000009499 grossing Methods 0.000 claims description 14
- 230000009467 reduction Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000009246 food effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/0802—Control mechanisms for pressure-cookers
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/09—Safety devices
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Cookers (AREA)
Abstract
The invention discloses a control method of a pressure cooking appliance, which belongs to the field of kitchen appliances and solves the problem that the pressure cooking appliance cannot detect the on-off state of a pressure switch after adopting a full-bridge rectifier module. The pressure detection module, the temperature detection module and the relay; the control method comprises the following steps: s10 detecting the temperature T of the liner through the temperature detecting module, when the temperature T of the liner reaches the preset range TA～TCThen, step S20 is executed if T > TCStep S30 is executed; s20, the relay is disconnected, the pressure detecting module detects the opening and closing state of the pressure switch and outputs a waveform diagram, and the waveform diagram is analyzed to obtain the current opening and closing state of the pressure switch; and S30, switching off the relay and stopping heating the inner container.
Description
[ technical field ] A
The invention relates to the field of kitchen appliances, in particular to a control method of a pressure cooking appliance.
[ background of the invention ]
When the pressure cooking appliance cooks food, the liquid in the pressure cooking appliance boils to generate steam along with the rise of the temperature, and the steam is limited in the pressure cooking appliance to lead to the continuous rise of the pressure and the temperature, thereby realizing the function of crushing the food. If the pressure in the pressure cooking utensil is too high, the danger of explosion may occur, so when the pressure reaches a certain degree, the heating is stopped, the pressure is reduced along with the gradual reduction of the internal temperature, and then the heating and pressurization are restarted. The pressure cooker utilizes the temperature detection of a bottom sensor and a cover sensor to convert the pressure into a corresponding temperature point, when the temperature point reaches a required value, the pressure reaches a rated value, and then a program controls a relay to stop heating. Generally, a mechanical pressure switch is utilized in a pressure cooking appliance, the pressure switch is judged to be disconnected through a waveform diagram of the on-off state of an output pressure switch of a pressure switch detection module, the cost of the pressure cooking appliance can be reduced by reducing the capacitance value of a smoothing capacitor, and in order to ensure that the pressure cooking appliance can normally work, a half-bridge rectifier circuit is changed into a full-bridge rectifier module, so that the pressure switch detection module is influenced and the on-off state of the pressure switch cannot be judged through the waveform diagram.
[ summary of the invention ]
The technical problem to be solved by the invention is to overcome the defects of the prior art, provide a control method of a pressure cooking appliance, and solve the problem that the pressure cooking appliance cannot detect the on-off state of a pressure switch after adopting a full-bridge rectifier module.
In order to solve the technical problem, the invention adopts the following technical scheme:
the control method of the pressure cooking appliance comprises an inner container, a heating plate used for heating the inner container, a pressure switch used for detecting the pressure of the inner container and a control system used for detecting the opening and closing states of the pressure switch, wherein the control system comprises: the pressure detection module is used for detecting the opening and closing state of the pressure switch; the temperature detection module is used for detecting the temperature of the inner container; the relay is used for controlling the on-off of the heating plate;
the control method comprises the following steps: s10 detecting the temperature T of the inner container through the temperature detecting module, when the temperature T of the inner container reaches the preset range TA～TCThen, step S20 is executed if T > TCStep S30 is executed; s20, the relay is disconnected, the pressure detecting module detects the opening and closing state of the pressure switch and outputs a waveform diagram, and the waveform diagram is analyzed to obtain the current opening and closing state of the pressure switch; s30, switching off the relay, and stopping heating the inner container; wherein, T isAFor the minimum temperature at which the pressure switch is open, TCThe rated temperature at which the pressure switch is open.
On the basis of the above scheme, in the step S20, analyzing the waveform diagram to obtain the current on-off state of the pressure switch includes: identifying a graph shape of the oscillogram; and comparing the current waveform diagram with the waveform diagram when the pressure switch is disconnected, wherein if the shapes of the graphs are the same, the pressure switch is in an off state, and if the shapes of the graphs are different, the pressure switch is in an on state.
On the basis of the above scheme, the control system further comprises an adjusting program for controlling the cooking state of the pressure cooking appliance according to the current state of the pressure switch, and the adjusting program is executed after step S20 or step S30.
On the basis of the scheme, the adjusting program comprises the following steps: m10 obtaining the current on-off state of the pressure switch, if the pressure switch is closed, executing step M20, if the pressure switch is opened, executing step M30; m20 controls the relay to maintain the closed state for the T1 period, and then performs step S10; m30 detects the temperature of the inner container in real time through the temperature detection module, when the temperature is lower than TAAfter that, the relay is closed, and step S10 is executed; wherein T1 is more than or equal to 30s and less than or equal to 2 min.
On the basis of the above scheme, in the step S20, the time duration for which the relay is turned off is T2, T2 is not more than 1S and is less than 2S, and the pressure detection module outputs a waveform diagram of the on-off state of the pressure switch within the time T2.
On the basis of the scheme, the pressure switch is connected with the heating plate in series.
On the basis of the scheme, the pressure cooking utensil further comprises a circuit system, the circuit system comprises a full-bridge rectification module, a smoothing capacitor and a voltage reduction module, the smoothing capacitor is connected with the full-bridge rectification module, and the voltage reduction module is connected with the smoothing capacitor and the pressure detection module.
On the basis of the scheme, the control system further comprises a chip control module and a relay driving module used for controlling the relay to be opened and closed, and the chip control module is connected with and controls the temperature detection module, the pressure detection module and the relay driving module.
The invention has the beneficial effects that:
pressure cooking utensil makes the soft rotten of eating the material and becoming through improving the inside pressure of inner bag when cooking the material, there is danger in order to avoid inner bag internal pressure too big, pressure cooking utensil disposes the temperature that is used for examining and examines the module, there is certain relevance in the temperature of inner bag and the pressure of inner bag, when the temperature of inner bag is a certain temperature promptly, the pressure of inner bag also is a certain numerical value, consequently only need examine through the temperature to the inner bag and examine the pressure that can survey current inner bag, after pressure reaches certain numerical value, need stop the heating of inner bag in order to avoid the continuation of inner bag pressure to increase. The pressure switch can detect the pressure of the inner container, and the pressure switch is disconnected after the pressure of the inner container rises, so that the on-off state of the pressure switch only needs to be detected, and the pressure detection module is used for detecting the on-off state of the pressure switch.
The pressure detection module can output a oscillogram according to the open-close state of the pressure switch, and the current open-close state of the pressure switch can be known through analysis of the oscillogram, however, if the pressure cooking appliance adopts the full-bridge rectification module, the relay can interfere with the oscillogram output by the pressure detection module, so that the open-close state of the pressure switch cannot be detected, and the pressure cooking appliance cannot control the open-close state of the relay according to the open-close state of the pressure switch.
The invention discloses a control method, mainly aiming at solving the problem of adopting the control method in a pressure cooking applianceThe full-bridge rectification module can solve the problem that the on-off state of the pressure switch is difficult to detect. When the pressure in the liner reaches a value which can turn off the pressure switch, the temperature in the liner is T, but the value of T is not a fixed value, but a certain deviation is allowed, namely when the temperature in the liner is TA～TCWhen the pressure switch is in the off state, the pressure switch is less than TAThe time pressure switch is necessarily in a closed state and is more than TCThe pressure switch is in an off state, so that the temperature T of the inner container is detected in the first stepCOr greater than TCAnd meanwhile, whether the pressure switch is disconnected or not does not need to be judged, the third step can be directly carried out, and the pressure is prevented from being increased along with the continuous increase of the temperature of the inner container. When the temperature is at TA～TCIn the meantime, the pressure switch may be in an open state or a closed state, and then the second step is performed, before the pressure detection module detects the open-close state of the pressure switch, the relay is firstly closed so that the relay does not affect the oscillogram output by the pressure detection module, and thus the current state of the pressure switch can be accurately obtained by analyzing the oscillogram output by the pressure detection module.
Further, in step S20, analyzing the waveform diagram to obtain the current opening/closing state of the pressure switch includes: identifying a graph shape of the oscillogram; and comparing the current waveform diagram with the waveform diagram when the pressure switch is disconnected, wherein if the shapes of the graphs are the same, the pressure switch is in an off state, and if the shapes of the graphs are different, the pressure switch is in an on state. When the pressure switch is in different states, the graphic shapes of the waveform diagrams output by the pressure detection module are different, and when the relay is in an opening state, the waveform diagrams output by the pressure detection module when the pressure switch is closed and opened are the same, so after the relay is closed, the pressure switch in different states corresponds to the waveform diagrams in different shapes, and only the current waveform diagram is compared with the waveform diagram when the pressure switch is opened.
Further, the control system further comprises an adjusting program for controlling the cooking state of the pressure cooking appliance according to the current state of the pressure switch, and the adjusting program is executed after step S20 or step S30. The adjustment program can control the cooking state of the pressure cooking appliance according to the opening and closing state of the pressure switch, so that auxiliary cooking is realized, and the cooking effect of food materials is improved.
Further, the adjusting procedure includes: m10, acquiring the opening and closing state of the current pressure switch, executing a step M20 if the pressure switch is closed, and executing a step M30 if the pressure switch is opened; the M20 controls the relay to keep the closed state in the T1 time period, and then executes the step S10; m30 detects the temperature of the inner container in real time through the temperature detection module, when the temperature is lower than TAAfter that, the relay is closed, and step S10 is executed; wherein T1 is more than or equal to 30s and less than or equal to 2 min. The closing of the pressure switch means that the pressure in the inner container does not reach a set value, at the moment, if the heating is stopped, the pressure in the inner container is insufficient, so that the food material cannot reach the expected soft and rotten degree, and the experience of a user is influenced, therefore, the temperature of the inner container also needs to be continuously improved, the opening and closing state of the pressure switch is detected by the pressure detection module at any moment, so that a large load is applied to the pressure detection module and the whole pressure cooking appliance system, after the heating is carried out for the time length of T1, the opening and closing state of the pressure switch is detected, and the relay is closed until the pressure switch is in the off state; when the pressure switch is turned off, the pressure in the inner container is enough, and the pressure is reduced after the temperature of the inner container is gradually reduced until the temperature is lower than TAThen the heating is restarted, so that the pressure and the temperature in the inner container can be kept at the most appropriate values all the time, and the cooking effect is ensured; the heating time is 30S-2 min, the liner can be heated in place, if the heating time is too short, the pressure value is not increased enough, one round of detection is possibly needed, and if the heating time is too long, the temperature can directly exceed TCAnd potential safety hazards are generated.
Further, in step S20, the closing time of the relay is T2, T2 is greater than or equal to 1S and less than 2S, and the pressure detection module outputs a waveform diagram of the open/close state of the pressure switch within T2 time. The heating plate can stop doing work and suspend the heating to the inner bag after the relay is closed, but the pressure is examined and is examined the on-off state of module to pressure switch and is examined and examine and just can accomplish in very short time, if the relay keeps closing always, can lead to the decline of temperature, pressure in the inner bag, influences the culinary art effect, and the relay is set up to the time of disconnection T2 for this, and after T2 time, the relay can reclose promptly.
Further, the pressure switch is connected with the heating plate in series. Pressure switch is the series relation with the circuit of the dish that generates heat, promptly when the pressure switch disconnection back, the dish that generates heat also can break off and can not continue to heat the inner bag, like this alright be higher than the safe numerical value of settlement far away with the temperature of avoiding the inner bag and pressure, although the dish that generates heat stops to heat, but the relay still is in the closure state, consequently need detect the on off state who controls the relay through the state to pressure switch, of course the relay also has the relation with generating heat between the dish, when the relay is in the closure state, the dish that generates heat also can't produce heat.
Further, pressure cooking utensil still includes the circuitry, the circuitry includes full-bridge rectifier module, smoothing capacitor and step-down module, smoothing capacitor connects full-bridge rectifier module, step-down module connects smoothing capacitor with the pressure is examined and is known the module. Through setting up full-bridge rectifier module, can guarantee that step-down module can normally work, so smoothing capacitor's appearance value can reduce with reduce cost.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a block diagram of a control system in an embodiment of the present invention;
FIG. 2 is a flow chart illustrating the detection of the open/close state of the pressure switch according to the present invention;
fig. 3 is a waveform diagram of an output of the pressure sensing module according to an embodiment of the invention.
[ detailed description ] A
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all of them. Other embodiments obtained by persons skilled in the art without making creative efforts based on the embodiments in the implementation belong to the protection scope of the invention.
The appearances of the phrases such as "exemplary," "some embodiments," and the like in the following text mean "serving as an example, embodiment, or illustration," and any embodiment described as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Numerous specific details are set forth in the following detailed description for purposes of better illustrating the invention, it will be appreciated by those skilled in the art that the disclosure may be practiced without some of these specific details.
Referring to fig. 1 to 3, an embodiment of the present invention discloses a method for controlling a pressure cooking appliance, wherein the pressure cooking appliance includes an inner container, a heating plate for heating the inner container, a pressure switch for detecting a pressure of the inner container, and a control system for detecting an open/close state of the pressure switch, the control system includes: the pressure detection module is used for detecting the opening and closing state of the pressure switch; the temperature detection module is used for detecting the temperature of the inner container; and the relay is used for controlling the power on and off of the heating plate.
Pressure cooking utensil makes the soft rotten of eating the material and becoming through improving the inside pressure of inner bag when cooking the material, there is danger in order to avoid inner bag internal pressure too big, pressure cooking utensil disposes the temperature that is used for examining and examines the module, there is certain relevance in the temperature of inner bag and the pressure of inner bag, when the temperature of inner bag is a certain temperature promptly, the pressure of inner bag also is a certain numerical value, consequently only need examine through the temperature to the inner bag and examine the pressure that can survey current inner bag, after pressure reaches certain numerical value, need stop the heating of inner bag in order to avoid the continuation of inner bag pressure to increase. The pressure switch can detect the pressure of the inner container, and the pressure switch can be disconnected after the pressure of the inner container rises, so that the opening and closing state of the pressure switch only needs to be detected, the pressure detection module can output a oscillogram according to the opening and closing state of the pressure switch, and the opening and closing state of the current pressure switch can be known through analysis of the oscillogram.
The circuit system is arranged in the pressure cooking appliance and generally comprises the smoothing capacitor and the voltage reduction module, and in order to reduce the cost of the pressure cooking appliance, the capacitance value of the smoothing capacitor is reduced, but the voltage reduction module cannot work normally, so that the circuit system adopts the full-bridge rectification module to replace the original half-bridge rectification module, and the normal work of the voltage reduction module can be ensured. The smoothing capacitor is connected with the full-bridge rectification module, and the voltage reduction module is connected with the smoothing capacitor and the pressure detection module. When the full-bridge rectification module is adopted in the pressure cooking appliance, the relay interferes with a oscillogram output by the pressure detection module, so that the on-off state of the pressure switch cannot be detected, and the pressure cooking appliance cannot control the on-off state of the relay according to the on-off state of the pressure switch.
The invention discloses a control method, which mainly aims to solve the problem that the detection of the opening and closing states of a pressure switch is difficult when a full-bridge rectifier module is adopted in a pressure cooking appliance.
The control method comprises the following steps:
s10 detecting the temperature T of the liner through the temperature detecting module, when the temperature T of the liner reaches the preset range TA～TCThen, go to step S20, if T > TCStep S30 is executed;
s20, the relay is disconnected, the pressure detecting module detects the opening and closing state of the pressure switch and outputs a waveform diagram, and the waveform diagram is analyzed to obtain the current opening and closing state of the pressure switch;
and S30, switching off the relay and stopping heating the inner container.
Wherein, TAMinimum temperature for the pressure switch to open, TCThe rated temperature at which the pressure switch is open. When the pressure in the liner reaches a value which can turn off the pressure switch, the temperature in the liner is T, but the value of T is not a fixed value, but a certain deviation is allowed, namely when the temperature in the liner is TA～TCWhen the pressure switch is in the off state, the pressure switch is less than TAThe time pressure switch is necessarily in a closed state and is more than TCThe pressure switch is in an off state, so that the temperature T of the inner container is detected in the first stepCOr greater than TCIn the process, whether the pressure switch is disconnected or not does not need to be judged, and the pressure switch can be directly disconnectedAnd entering a third step, avoiding the continuous increase of the temperature of the inner container and the increase of the pressure. When the temperature is at TA～TCIn the meantime, the pressure switch may be in an open state or a closed state, and then the second step is performed, before the pressure detection module detects the open-close state of the pressure switch, the relay is firstly closed so that the relay does not affect the oscillogram output by the pressure detection module, and thus the current state of the pressure switch can be accurately obtained by analyzing the oscillogram output by the pressure detection module.
Specifically, in step S20, the analyzing the waveform diagram to obtain the current on-off state of the pressure switch includes:
identifying a graph shape of the oscillogram;
and comparing the current waveform diagram with the waveform diagram when the pressure switch is disconnected, wherein if the shapes of the graphs are the same, the pressure switch is in an off state, and if the shapes of the graphs are different, the pressure switch is in an on state.
The stable waveform signal generated by the stable device is regular, and the stable waveform signal generated by the stable device under different states is different, wherein the difference comprises: the parameters such as peak value and period, and the waveform signals with the same parameters form the same waveform diagram. Therefore, when the pressure switch is in different states, the graphic shapes of the waveform diagrams output by the pressure detection module are different, and when the relay is in an open state, the waveform diagrams output by the pressure detection module when the pressure switch is closed and opened are the same, so after the relay is closed, the pressure switch in different states corresponds to the waveform diagrams in different shapes, and only the current waveform diagram is compared with the waveform diagram when the pressure switch is opened.
Specifically, the on-off states of the relay and the pressure switch have four conditions: 1, closing a relay and closing a pressure switch; 2, closing the relay and disconnecting the pressure switch; 3, the relay is disconnected, and the pressure switch is closed; and 4, the relay is disconnected, and the pressure switch is disconnected. Referring to fig. 3, there are two waveform diagrams in fig. 3, in the case of 1, 2, and 3, the waveform diagram is the upper diagram in fig. 3, and in the case of 4, the waveform diagram is the lower diagram, so that when the relay is closed, even if the pressure switch is turned off, the waveform diagram cannot be analyzed, and therefore, after the relay is closed, the two cases 1 and 2 can be eliminated, and only the two cases 3 and 4 remain, so that the current state of the pressure switch can be easily analyzed.
When the on-off state of the pressure switch is detected, the relay needs to be closed, the heating plate stops working after the relay is closed, heating of the inner container is suspended, but detection of the on-off state of the pressure switch by the pressure detection module can be completed within a short time, if the relay is kept closed all the time, the temperature and the pressure in the inner container are reduced, and the cooking effect is influenced, therefore, in step S20, the closing time of the relay needs to be limited to be T2, namely after T2 time, the relay can be closed again, the pressure detection module outputs a waveform diagram of the on-off state of the pressure switch within T2 time, wherein T2 is less than or equal to 1S and less than 2S, and in the time period, the pressure detection module has enough time to detect the on-off state of the pressure switch and generate a waveform signal.
Based on the above embodiments, in one embodiment of the present invention, the control system further comprises an adjustment procedure for controlling the cooking state of the pressure cooking appliance according to the current state of the pressure switch, the adjustment procedure being performed after step S20 or step S30.
The adjustment procedure can control the cooking state of the pressure cooking appliance according to the opening and closing state of the pressure switch, so that auxiliary cooking is realized, and the cooking effect of food materials is improved.
Specifically, the adjustment procedure includes:
m10, acquiring the opening and closing state of the current pressure switch, executing a step M20 if the pressure switch is closed, and executing a step M30 if the pressure switch is opened;
the M20 controls the relay to keep the closed state in the T1 time period, and then executes the step S10;
m30 detects the temperature of the inner container in real time through the temperature detection module, and when the temperature is lower than TAAfter that, the relay is closed, and step S10 is executed.
Wherein T1 is more than or equal to 30s and less than or equal to 2 min. Pressure switch closing ideaIf the pressure in the inner container does not reach a set value, the temperature of the inner container needs to be continuously increased if the heating is stopped, the opening and closing state of the pressure switch is detected by the pressure detection module at any moment, so that a large load is applied to the pressure detection module and the whole pressure cooking appliance system, after the heating for T1 time, the opening and closing state of the pressure switch is detected, and the relay is closed until the pressure switch is in the off state; when the pressure switch is turned off, the pressure in the inner container is enough, and the pressure is reduced after the temperature of the inner container is gradually reduced until the temperature is lower than TAThen the heating is restarted, so that the pressure and the temperature in the inner container can be always kept at the most proper values to ensure the cooking effect. (ii) a The heating time is 30S-2 min, the inner container can be heated in place, if the heating time is too short, the pressure value is not increased enough, a round of detection is possibly needed, and if the heating time is too long, the temperature can directly exceed TCAnd potential safety hazards are generated.
Generally, the pressure of the inner container of the pressure cooking appliance is set to be a safe value, the pressure cooking appliance is safe when the pressure is below the safe value, after the safe value is exceeded, danger can occur, and the danger coefficient is larger as the value is higher. When the temperature of the inner container is at TA～TCMeanwhile, but the pressure switch is still in the closed state, according to the step M20 of the above-mentioned adjusting program, the relay is kept closed for a time period T1, that is, the heating plate keeps heating the inner container for a time period T1, and the temperature of the inner container may exceed T after the heatingCThe pressure in the inner bag also can reach and even exceed the safe numerical value of settlement, and in order to guarantee safety, pressure switch and the dish that generates heat are for establishing ties, so in case the pressure switch disconnection back, the dish that generates heat also can break off and can not continue to heat the inner bag, alright so avoid inner bag temperature and pressure to be higher than the safe numerical value of settlement far away. Through the arrangement mode, the temperature of the inner container hardly exceeds T in the actual use processCOnce the temperature reaches TCTime, pressure switchThe heating plate is automatically disconnected to stop heating, so that the safety of the pressure cooking appliance is improved. Although the heating plate stops heating, the relay is still in a closed state, so the on-off state of the relay needs to be controlled by detecting the state of the pressure switch, and certainly, the relay and the heating plate are also related, and when the relay is in an open state, the heating plate can not generate heat.
In addition, the control system further comprises a chip control module and a relay driving module used for controlling the opening and closing of the relay, wherein the chip control module is connected with and controls the temperature detection module, the pressure detection module and the relay driving module. The chip control module can execute corresponding functions according to the states, signals and the like of all the elements, and the normal work of the pressure cooking appliance is guaranteed.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the present invention may be practiced without limitation to such specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (8)
1. The control method of the pressure cooking appliance is characterized in that the pressure cooking appliance comprises an inner container, a heating plate used for heating the inner container, a pressure switch used for detecting the pressure of the inner container and a control system used for detecting the opening and closing state of the pressure switch, and the control system comprises:
the pressure detection module is used for detecting the opening and closing states of the pressure switch;
the temperature detection module is used for detecting the temperature of the inner container;
the relay is used for controlling the power on and off of the heating plate;
the control method comprises the following steps:
s10 detecting the temperature T of the liner through the temperature detecting module, when the temperature T of the liner reaches the preset range TA～TCThen, step S20 is executed if T > TCStep S30 is executed;
s20, the relay is disconnected, the pressure detecting module detects the opening and closing state of the pressure switch and outputs a waveform diagram, and the waveform diagram is analyzed to obtain the current opening and closing state of the pressure switch;
s30, switching off the relay, and stopping heating the inner container;
wherein, T isAThe minimum temperature at which the pressure switch is turned off, TCThe rated temperature at which the pressure switch is open.
2. The method for controlling a pressure cooking appliance according to claim 1, wherein the step S20 of analyzing the waveform diagram to obtain the current on/off state of the pressure switch includes:
identifying a graphical shape of the oscillogram;
and comparing the current waveform diagram with the waveform diagram when the pressure switch is disconnected, wherein if the shapes of the graphs are the same, the pressure switch is in an off state, and if the shapes of the graphs are different, the pressure switch is in an on state.
3. The control method of a pressure cooking appliance according to claim 1, wherein the control system further comprises an adjustment procedure of controlling the cooking state of the pressure cooking appliance according to the current state of the pressure switch, the adjustment procedure being performed after step S20 or step S30.
4. The control method of a pressure cooking appliance according to claim 3, wherein the adjustment procedure includes:
m10 obtaining the current on-off state of the pressure switch, if the pressure switch is closed, executing step M20, if the pressure switch is opened, executing step M30;
m20 controls the relay to maintain the closed state for the T1 period, and then performs step S10;
m30 detects the temperature of the inner container in real time through the temperature detection module, and when the temperature is lower than TAAfter that, the relay is closed, and step S10 is executed;
wherein T1 is more than or equal to 30s and less than or equal to 2 min.
5. The method for controlling a pressure cooking appliance according to claim 1, wherein in step S20, the time period for which the relay is turned off is T2, 1S is less than or equal to T2 and less than 2S, and the pressure sensing module outputs a waveform diagram of the on-off state of the pressure switch within T2 time.
6. The control method of the pressure cooking appliance according to any one of claims 1 to 5, wherein the pressure switch is connected in series to the heat generating plate.
7. The method of controlling a pressure cooking appliance according to any one of claims 1 to 5, wherein the pressure cooking appliance further comprises a circuit system including a full-bridge rectification module, a smoothing capacitor connected to the full-bridge rectification module, and a voltage reduction module connected to the smoothing capacitor and the pressure detection module.
8. The method for controlling a pressure cooking appliance according to any one of claims 1 to 5, wherein the control system further comprises a chip control module and a relay driving module for controlling the opening and closing of a relay, and the chip control module is connected with and controls the temperature detection module, the pressure detection module and the relay driving module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210272013.9A CN114766905B (en) | 2022-03-18 | 2022-03-18 | Control method of pressure cooking appliance |
Applications Claiming Priority (1)
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| KR20110007565U (en) * | 2011-07-13 | 2011-07-29 | 성옥 오 | Instant cooking container for press to regulate temperature |
| CN203164376U (en) * | 2013-03-26 | 2013-08-28 | 美的集团股份有限公司 | Switch detection circuit for pressure cooking appliance |
| CN105935244A (en) * | 2016-05-26 | 2016-09-14 | 珠海格力电器股份有限公司 | Pressure control method and apparatus of electric pressure cooker, and electric pressure cooker |
| CN106667241A (en) * | 2017-01-04 | 2017-05-17 | 九阳股份有限公司 | Method for cooking of pressure cooker |
| CN206628714U (en) * | 2017-04-10 | 2017-11-10 | 北京德威特继保自动化科技股份有限公司 | Low voltage switch equipment |
| CN110613333A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Heating control method and system of pressure cooking appliance and pressure cooking appliance |
| CN113532679A (en) * | 2020-04-22 | 2021-10-22 | 浙江绍兴苏泊尔生活电器有限公司 | Circuit and method for temperature detection and pressure cooking appliance |
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| KR20110007565U (en) * | 2011-07-13 | 2011-07-29 | 성옥 오 | Instant cooking container for press to regulate temperature |
| CN203164376U (en) * | 2013-03-26 | 2013-08-28 | 美的集团股份有限公司 | Switch detection circuit for pressure cooking appliance |
| CN105935244A (en) * | 2016-05-26 | 2016-09-14 | 珠海格力电器股份有限公司 | Pressure control method and apparatus of electric pressure cooker, and electric pressure cooker |
| CN106667241A (en) * | 2017-01-04 | 2017-05-17 | 九阳股份有限公司 | Method for cooking of pressure cooker |
| CN206628714U (en) * | 2017-04-10 | 2017-11-10 | 北京德威特继保自动化科技股份有限公司 | Low voltage switch equipment |
| CN110613333A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Heating control method and system of pressure cooking appliance and pressure cooking appliance |
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| CN114766905B (en) | 2024-04-19 |
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