CN102429574B - Electric pressure cooker capable of automatically controlling pressure and pressure control method thereof - Google Patents
Electric pressure cooker capable of automatically controlling pressure and pressure control method thereof Download PDFInfo
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- CN102429574B CN102429574B CN201110336266.XA CN201110336266A CN102429574B CN 102429574 B CN102429574 B CN 102429574B CN 201110336266 A CN201110336266 A CN 201110336266A CN 102429574 B CN102429574 B CN 102429574B
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- 238000010411 cooking Methods 0.000 claims abstract description 90
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- 238000009434 installation Methods 0.000 claims description 9
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- 238000001514 detection method Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 3
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- 230000003287 optical effect Effects 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The invention discloses an electric pressure cooker capable of automatically controlling pressure and a pressure control method thereof, relating to the technical field of kitchen utensils and solving the problem that the traditional electric pressure cooker with multi-stage pressure control has higher cost. The electric pressure cooker capable of automatically controlling pressure, disclosed by the embodiment of the invention, comprises a cooker cover, a cooker body, a cooker liner and a control device for detecting and controlling change of cooking pressure; the control device comprises a reference pressure switch for setting reference pressure and an obscure pressure control unit for setting target pressure; when the cooking pressure reaches the reference pressure, the reference pressure switch is triggered to actuate to send a pressurizing signal, and the obscure pressure control unit is used for controlling the cooling pressure to reach the target pressure from the reference pressure while detecting the pressurizing signal. The embodiment of the invention is mainly used for various electric pressure cookers.
Description
Technical field
The present invention relates to kitchen appliance technical field, particularly relate to electric pressure cooking saucepan automatic pressure-controlled in kitchen appliance and compress control method thereof.
Background technology
Along with the raising of electric pressure cooking saucepan safety coefficient, the use of electric pressure cooking saucepan obtains universal preferably, existing electric pressure cooking saucepan has the function compared with horn of plenty, especially there is the function for different food setting different culinary art pressure, make that user's is better selective, and the food mouthfeel cooked is also better.The scheme setting culinary art pressure when carrying out different food cooking in prior art mainly comprises the following two kinds:
The first, temperature-sensing element is set on the pot cover of electric pressure cooking saucepan, according to the roughly corresponding relation of temperature and pressure, thus the pot inner pressure that realization is extrapolated roughly after temperature being detected, thus carry out Stress control.
The second, arrange multiple pressure switch in the bottom of electric pressure cooking saucepan, the corresponding a kind of culinary art pressure of each pressure switch, realizes multistage Stress control.
Realizing and using in the process of above-mentioned electric pressure cooking saucepan, inventor finds that in prior art, at least there are the following problems: when adopting the first temperature controlled scheme, when food in pot is more, rate of pressure increase gathers way soon than temperature, causes can not accurately carrying out Stress control; When adopting the second to regulate the scheme of pressure switch, can only carry out Stress control according to institute's setting pressure switch on pressure cooker, the cost realizing multistage pressure control is higher.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art and provides a kind of automatic pressure-controlled electric pressure cooking saucepan and compress control method thereof, reduces the multistage pressure control cost of electric pressure cooking saucepan.
For achieving the above object, the present invention adopts following technical scheme:
An automatic pressure-controlled electric pressure cooking saucepan, comprise pot cover, pot body, pot courage, for detection and control culinary art pressure change control device; Described control device comprises the setting reference pressure switch of reference pressure and the fuzzy pressure control unit of set target pressure; Culinary art pressure touches reference pressure switch motion when reaching reference pressure and sends pressure signal, and fuzzy pressure control unit inspection reaches goal pressure to controlling culinary art pressure during upper pressure signal from reference pressure.
Be provided with induction kettle courage produces change in displacement displacement induction installation by the effect of culinary art pressure in described pot body, when culinary art pressure reaches reference pressure, displacement induction installation touches reference pressure switch motion and sends pressure signal.
Described fuzzy pressure control unit comprises computing module and selects module.
Described displacement induction installation comprises the elastic supporting member for supporting optical member of support pot courage and touches the touch pole of reference pressure switch.
Described reference pressure switch is bimetal leaf flash switch or microswitch.
Be applied to a compress control method for described electric pressure cooking saucepan, described control device also comprises memory cell and timing unit, is preset with and reaches heating parameter sequence W needed for goal pressure for controlling to cook pressure from reference pressure in memory cell
n, and with heating parameter W
ncorresponding sequence t fiducial time
n, described compress control method comprises with the next stage, and order is carried out:
The stage is pressed in heating: control device startup is heated to reference pressure switch and sends pressure signal, timing unit calculates upper pressure time t
0;
The time delay heating period: fuzzy pressure control unit determines sequence t fiducial time
nin with upper pressure time t
0corresponding t fiducial time
m(m≤n), and select heating parameter sequence W
nin with t fiducial time
mcorresponding heating parameter W
mtime delay is heated to goal pressure.
Described control device also comprises the compensation pressure switch for carrying out deviation compensation to goal pressure, and the described time delay heating period is further comprising the steps of:
Timing unit calculates from reference pressure switch motion to the incremental time Δ t compensating pressure switch action
0, control device is according to incremental time Δ t
0with the benchmark increment Delta t preset in the memory unit
bcomparative result correction heating parameter W
mto reduce to cook the deviation that pressure reaches goal pressure.
Described electric pressure cooking saucepan comprises the pressure switch of the different size pressure of multiple setting, and in described heating, the pressure stage is further comprising the steps of:
Control device is therefrom selected opening pressure to reach goal pressure to have pressure switch corresponding to minimum deviation value as reference pressure switch, and control device controls to produce when culinary art pressure reaches reference pressure to press signal.
Described pressure switch comprises low tension switch and high-voltage switch gear, and in described heating, the pressure stage is further comprising the steps of:
The heating rate of described fuzzy pressure control unit judges cooking food, if when the heating rate of cooking food is greater than the benchmark heating rate preset in the memory unit, fuzzy pressure control Unit selection low tension switch is as reference pressure switch; Otherwise fuzzy pressure control Unit selection high-voltage switch gear is as reference pressure switch.
Described heating parameter is heating power and/or heat time.
Automatic pressure-controlled electric pressure cooking saucepan provided by the invention and compress control method thereof, pressure controlled mode is adopted to carry out the control of multistage pressure, when the goal pressure needing to reach is identical with the reference pressure of design, reference pressure can be adopted to control, the present invention is mainly for when goal pressure is greater than reference pressure, goal pressure is reached to controlling culinary art pressure during upper pressure signal from reference pressure by fuzzy pressure control unit inspection, the mode of this fuzzy pressure control can make actual pressure in pot can be close with goal pressure, and the Stress control that can adapt to when food is more in pot, pressure divergence is made to be unlikely to too large.
In addition, because the embodiment of the present invention adopts fuzzy pressure scheme, the Stress control of more gear can be realized by less pressure switch, such as: a pressure switch can be adopted to realize two sections and above Stress control, two pressure switches are adopted to realize three sections and above Stress control, and so on; For multistage pressure control scheme complete in prior art, the quantity of pressure switch can be reduced, reduce pressure cooker cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is electric pressure cooker structure schematic diagram automatic pressure-controlled in the embodiment of the present invention one;
Fig. 2 is the theory diagram of control device in the embodiment of the present invention one;
Fig. 3 is the flow chart of electric pressure cooking saucepan compress control method in the embodiment of the present invention two;
Fig. 4 is the flow chart of electric pressure cooking saucepan compress control method in the embodiment of the present invention three.
Detailed description of the invention
In order to overcome temperature controlled inaccuracy, pressure switch can be set on electric pressure cooking saucepan, thus realize Stress control, and segmentation Stress control can be realized when arranging two pressure switch, two pressure switch has two opening pressures, and user can select any one opening pressure to carry out Stress control.If user have selected the low-grade pressure in pressure switch, then electrical pressure cooker control circuit can start pressurize after the switch disconnection low-grade pressure being detected; If user have selected the high-grade pressure in pressure switch, then electrical pressure cooker control circuit can continue heating after the switch disconnection low-grade pressure being detected, until the switch of high-grade pressure disconnects start pressurize again.
Because pressure switch gear is limited, in order to realize the Stress control of more than two sections, pressure switch is set to the gear of adjustable form or increase pressure switch, adopts which kind of mode above-mentioned all can increase the design complexities of pressure switch, the design cost of pressure cooker is increased.
For above-mentioned situation, embodiment of the present invention design one can realize the pressure controlled scheme of multistage at low cost, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one:
The embodiment of the present invention provides a kind of automatic pressure-controlled electric pressure cooking saucepan, as shown in Figure 1, this electric pressure cooking saucepan comprises pot cover 10, pot body 20, pot courage 30, and the control device of pressure change is cooked for detection and control, control device in the embodiment of the present invention is except comprising the reference pressure switch 21 in Fig. 1, in other the general Integrated design of structure control circuit board 22 in FIG, said reference pressure switch 21 is triggered when cooking pressure and reaching reference pressure action send and press signal, in the embodiment of the present invention, when reaching culinary art pressure, reference pressure switch can disconnect, produce cut-off signal, this cut-off signal just can as upper pressure signal.After setting goal pressure, if any one is identical for goal pressure and pressure switch opening pressure, then existing scheme can be adopted to control, repeat no more herein.
In the embodiment of the present invention control device Integrated design control circuit board part as shown in Figure 2, this control device comprises the fuzzy pressure control unit 221 of set target pressure, when pressing signal on detecting, fuzzy pressure control unit 221 controls culinary art pressure and reaches goal pressure from reference pressure.
Automatic pressure-controlled electric pressure cooking saucepan provided by the invention, pressure controlled mode is adopted to carry out the control of multistage pressure, when the goal pressure needing to reach is identical with the reference pressure of design, reference pressure can be adopted to control, the present invention is mainly for when goal pressure is greater than reference pressure, control culinary art pressure when upper pressure signal being detected by fuzzy pressure control unit 221 and reach goal pressure from reference pressure, the mode of this fuzzy pressure control can make actual pressure in pot can be close with goal pressure, Stress control when more can adapt to that in pot, quantity of food is more than existing temperature control scheme, pressure divergence is made to be unlikely to too large.Because the embodiment of the present invention adopts fuzzy pressure control scheme, the Stress control of more gear can be realized by less pressure switch, for multistage pressure control scheme complete in prior art, the quantity of pressure switch can be reduced, reduce pressure cooker cost.
Fuzzy pressure control unit 221 described in the embodiment of the present invention comprises computing module 2211 and selects module 2212, wherein needs in control device to preset to reach heating parameter sequence W needed for goal pressure for controlling to cook pressure from reference pressure
n, and with heating parameter W
ncorresponding sequence t fiducial time
n.Above-mentioned computing module 2211 determines sequence t fiducial time by computing
nin with upper pressure time t
0corresponding t fiducial time
m(m≤n), then selects heating parameter sequence W by selection module 2212
nin with t fiducial time
mcorresponding heating parameter W
mtime delay is heated to goal pressure.Such as, concrete control mode can be: when pressing signal on detecting, selecting predetermined heating parameter to carry out time delay heating makes culinary art pressure reach goal pressure from reference pressure, heat parameter selected in it and be mainly heating power or heat time, or the combination of heating power and heat time, specifically how to select, have a detailed description in subsequent control method, repeat no more herein.
Can touch reference pressure switch to make reference pressure switch under the state of reference pressure to send and press signal, in pot body, induction kettle courage produces change in displacement displacement induction installation by the effect of culinary art pressure is provided with in the embodiment of the present invention, when culinary art pressure reaches reference pressure, displacement induction installation touches reference pressure switch motion and sends pressure signal, elastic device can be set at bottom of pot body in general, by the change of elastic device induction kettle tooth pressure, elastic device is made to be out of shape and to produce change in displacement; Certainly, on the pot cover that elastic device can also be arranged in the embodiment of the present invention or other positions of pot body; So the displacement induction installation in the embodiment of the present invention can comprise the elastic supporting member for supporting optical member of support pot courage and touch the touch pole of reference pressure switch.
In order to the sensitivity of reference pressure switch reflection, reference pressure switch in the embodiment of the present invention can be at present comparatively conventional two pressure switch or single pressure switch, can the adopting but be not limited to bimetal leaf flash switch or microswitch of concrete pressure switch.
Embodiment two:
Selection goal pressure is needed when using embodiment of the present invention electric pressure cooking saucepan, to ensure that electric pressure cooking saucepan realizes Stress control according to the requirement of user, so the electric pressure cooking saucepan in the embodiment of the present invention comprises the control device of set target pressure, generally, user can select while cooking method just can the selection of realize target pressure, such as: user selects pattern of cooking congee, Baoshang pattern, to cook pattern, meat pattern etc., corresponding different pattern all needs to set its most suitable goal pressure, generally for meat pattern or need its goal pressure of the pattern of infusion bone higher, for the pattern of cooking congee or its goal pressure of Baoshang pattern lower.Generally goal pressure be about 30Kpa to 70Kpa not etc., the embodiment of the present invention does not limit the target pressure value of concrete setting.
The embodiment of the present invention provides the compress control method being applied to electric pressure cooking saucepan in above-described embodiment one, in order to this compress control method can be realized, as shown in Figure 2, in the electric pressure cooking saucepan that the embodiment of the present invention is automatic pressure-controlled, control device also comprises memory cell 222 and timing unit 223, and memory cell 222 and timing unit 223 are also generally on the control circuit board of integrated setting; Be preset with in described memory cell 222 and reach heating parameter sequence W needed for goal pressure for controlling to cook pressure from reference pressure
n, and with heating parameter W
ncorresponding sequence t fiducial time
n.Electric pressure cooking saucepan comprises the process that following order performs when specifically carrying out Stress control:
The stage is pressed in heating: control device startup is heated to reference pressure switch and sends pressure signal, timing unit 223 calculates upper pressure time t
0;
The time delay heating period: fuzzy pressure control unit 221 determines sequence t fiducial time
nin with upper pressure time t
0corresponding t fiducial time
m(m≤n), and select heating parameter sequence W
nin with t fiducial time
mcorresponding heating parameter W
mtime delay is heated to goal pressure.Make pot inner pressure can rise to the pressure nearer with goal pressure by this time delay heating, realize fuzzy pressure control, than temperature control scheme of the prior art more can adapt to quantity of food more time Stress control, make pressure divergence be unlikely to too large.
Heating parameter W is selected concrete
mtime, the embodiment of the present invention can adopt following scheme: determining t fiducial time
mtime (m≤n), the general fiducial time selected and in fact press time difference minimum, the heating parameter adopting the program to select can make the culinary art pressure of electric pressure cooking saucepan after the time delay heating period terminates more close to goal pressure.
Control device in the embodiment of the present invention can also comprise input block and display unit, can be carried out the setting of culinary art pattern by input block, can be shown the various information of electric pressure cooking saucepan, as temperature, cooking time etc. by display unit.Certainly, control device can also comprise other unit do not mentioned in the embodiment of the present invention, so as jointly to realize electric pressure cooking saucepan culinary art control, the embodiment of the present invention be mainly absorbed in by time delay heating carry out Stress control, other parts can adopt but be not limited to existing scheme, repeat no more.
Adopt the electric pressure cooking saucepan compress control method that the embodiment of the present invention provides, pot inner pressure can not only be controlled to reference pressure relatively preferably, for the goal pressure being greater than reference pressure, pot inner pressure can be made to reach goal pressure by time delay heating, thus achieve the multistage Stress control of electric pressure cooking saucepan, realize the fuzzy control of pressure.And the embodiment of the present invention have employed Stress control, Stress control when control more can adapt to that in pot, quantity of food is more for temperature control scheme.In addition, because the embodiment of the present invention adopts fuzzy pressure scheme, the Stress control of more gear can be realized by less pressure switch, such as: a pressure switch can be adopted to realize two sections and above Stress control, two pressure switches are adopted to realize three sections and above Stress control, and so on; For multistage pressure control scheme complete in prior art, the quantity of pressure switch can be reduced, reduce pressure cooker cost.
After continuation heating reaches described delay time, pot inner pressure is substantially close with goal pressure, can enter pressurize handling procedure or directly stop heating by control voltage power pot afterwards.Concrete pressurize process can adopt existing scheme, as: can reheat when pot inner pressure reduces more.
In order to ensure the culinary art safety of electric pressure cooking saucepan; needs prevent at electric pressure cooking saucepan pot inner pressure excessive; electric pressure cooking saucepan in the embodiment of the present invention generally adopts two pressure switch to realize reference pressure switch; and it is maximum reference pressure that the medium-to-high grade pressure switch of two pressure switch disconnects corresponding pressure; can be designed as safeguard protection pressure; so control voltage power pot carries out pressurize process or stops heating after above-mentioned control unit also reaches maximum reference pressure for the pressure in electric pressure cooking saucepan.Thus, once there is the problem that pressure is excessive in time delay heating process, can safeguard protection be carried out, effectively avoid the appearance of quick-fried pot phenomenon.
Heating parameter in the embodiment of the present invention mainly refers to heating power and/or the heat time of time delay heating period, such as can select separately heat time or heating power according in fact pressing the time, also can select heat time and heating power according in fact pressing the time, concrete choosing of parameter of heating can adopt but be not limited to following scheme simultaneously:
The first, the heating power of time delay heating period is fixed up as the heating power preset, generally can the total power of setting voltage power pot as its heating power.In order to determine the heat time, the heating parameter sequence W in the embodiment of the present invention
ncan comprise and sequence t fiducial time
nthe corresponding rate of pressure rise sequence reaching goal pressure from reference pressure; Then control unit 42 is according in fact pressing time t
0corresponding rate of pressure rise and the pressure differential between goal pressure and reference pressure calculate the heat time of time delay heating period.
The second, using the heating power of time delay heating period as the heating power preset, be fixed up, generally can the total power of setting voltage power pot as its heating power.In order to determine the heat time, the heating parameter sequence W in the embodiment of the present invention
ncan comprise and sequence t fiducial time
ncorresponding reach heat time sequence T needed for goal pressure from reference pressure
n; So, control unit 42 is at heat time sequence T
nin search and in fact press time t
0corresponding heat time T
mas the heat time T of time delay heating period
m.
Three, adopt the heat time preset as the heat time of time delay heating period, make it be fixed up, be specifically set as how long can verifying preferably cooking time by experiment.In order to determine heating power, in the embodiment of the present invention, heat parameter sequence W
ncan comprise and sequence t fiducial time
ncorresponding reach heating power sequence P needed for goal pressure from reference pressure
n; So, control unit 42 is at described heating power sequence P
nin search and in fact press time t
0corresponding heating power P
mas the heating power of time delay heating period.
Four, can also be designed to time delay heating period heating power and heat time in the embodiment of the present invention is change, needs heating parameter sequence W
ncomprise and sequence t fiducial time simultaneously
ncorresponding reach heating power sequence P needed for goal pressure from reference pressure
nand heat time sequence T
n; So, described control unit 42 is at heat time sequence T
nin search and in fact press time t
0corresponding heat time T
mas the heat time of time delay heating period, and at described heating power sequence P
nin search and in fact press time t
0corresponding heating power P
mas the heating power of time delay heating period.
The electric pressure cooking saucepan of pressure detecting is carried out below for two pressure switch, electric pressure cooking saucepan compress control method in the embodiment of the present invention is described in detail, and the pressure adopting the low-grade pressure switch in two pressure switch corresponding in the program is as reference pressure, as shown in Figure 3, the method comprises following process to detailed process:
301, user sets corresponding goal pressure when using electric pressure cooking saucepan, concrete scheme can adopt but be not limited to the scheme above by model selection set target pressure, user can be started working by associative operation starting resistor power pot afterwards, now electric pressure cooking saucepan starts carry out heating and carry out timing, enters culinary art flow process.
302, detect two low and middle-grade pressure switch of pressure switch whether to disconnect, if low-grade pressure switch does not disconnect, then continue heat and perform 302 processes; If low-grade pressure switch disconnects, then perform 303 processes.
303, timing is stopped to show that timing time is as in fact pressing time t
0, and judging that user's select target pressure is low pressure gear, pressure corresponding when that is whether goal pressure disconnects with low-grade pressure switch is identical, if identical, then performs 310 processes; If not identical, represent and also need to heat, then perform 304 processes.
The in fact pressure time t that in the scheme provided in the embodiment of the present invention, timing draws
0the reference pressure time used is reached for being heated to culinary art pressure from electric pressure cooking saucepan, when concrete utilization, those skilled in the art can change, and can reach the reference pressure time used, draw and in fact press time t from electric pressure cooking saucepan heats after the scheduled time to culinary art pressure
0as long as follow-up sequence fiducial time carries out corresponding modify.
304, judge that user's select target pressure is high pressure gear, pressure corresponding when that is whether goal pressure disconnects with two medium-to-high grade pressure switch of pressure switch is identical, if identical, then performs 305 processes; If not identical, then perform 306 processes.
305, continue heat and detect pair medium-to-high grade pressure switch of pressure switch and whether disconnect, if high-grade pressure switch does not disconnect, then continuation execution 305 process; If high-grade pressure switch disconnects, then represent the goal pressure reaching culinary art, perform 310 processes.
306, in order to make pot inner pressure reach goal pressure, the mode that can be heated by time delay is realized, and the embodiment of the present invention needs the heating parameter accurately drawing the time delay heating period.So the fuzzy pressure control unit of embodiment of the present invention electric pressure cooking saucepan determines sequence t fiducial time
nin with upper pressure time t
0corresponding t fiducial time
m(m≤n), and select heating parameter sequence W
nin with t fiducial time
mcorresponding heating parameter W
mtime delay is heated to goal pressure, and concrete heating parameter can adopt aforesaid heating power and/or heat time.
307, continue to heat electric pressure cooking saucepan.
308, safer in order to make electric pressure cooking saucepan use, ensureing in time delay heating process can not quick-fried pot, whether the embodiment of the present invention time delay heating period needs to detect two medium-to-high grade pressure switch of pressure switch and disconnects, if high-grade pressure switch does not disconnect, then can continue heat and perform 309 processes; If high-grade pressure switch disconnects, because high-grade pressure switch represents maximum reference pressure, pot inner pressure has reached the upper limit of safe pressure, needs to adopt safeguard measure, so 310 processes of execution.
309, judge whether the delay time that time delay is heated arrives, if do not arrived, execution 307 process can be returned, to continue heating; If arrival delay time, then represent that pot inner pressure reaches goal pressure, can perform 310 processes.
310, carry out pressurize process to electric pressure cooking saucepan or directly stop heating, concrete pressurize process can adopt but be not limited to pressurize flow process of the prior art.
After the scheme adopting the embodiment of the present invention to provide, multistage Stress control can be realized by time delay, although can not accurate controlled pressure such with pressure switch, but the time of time delay passes through test of many times, pot inner pressure closely goal pressure can be made, error is less, belongs to and more adapts to than temperature control scheme the situation that in pot, quantity of food is more.
If the time delay heating period adopts fixing heating power, in order to determine the concrete time delay heat time, can according to the upper pressure Time Calculation delay time of electric pressure cooking saucepan in the embodiment of the present invention, concrete mode includes but not limited to following scheme:
If first embodiment of the present invention adopts the scheme of above-mentioned timing, then can determine delay time according to the upper pressure time, here the upper pressure time just refer to from be heated to time required for reference pressure that Voltage force pot inner pressure reaches setting, namely from be heated to low-grade pressure switch disconnect time, concrete computational methods comprise:
1) the upper pressure time was determined by the scheme of above-mentioned timing;
2) in order to accurately delay time can be determined, can know that the concrete upper pressure time was different by inventor's experimental verification, rate of pressure rise after corresponding low-grade pressure switch disconnects is different, through experimental verification, when low-grade pressure switch opening pressure is set as 30Kpa, concrete corresponding relation is as following table:
The time that the pressure that often rise 10Kpa by pot inner pressure after reaching 30Kpa in upper table needs represents the rate of climb, when concrete utilization, above-mentioned correspondence table can be set in advance in the control circuit of electric pressure cooking saucepan by those skilled in the art, when needing to carry out time delay and calculating according on the pressure time in upper table, search the rate of pressure rise of correspondence.Do not mark the time corresponding to space of concrete rate of pressure rise in upper table, rate of pressure rise nearest in form can be selected, general to a little bit smaller rate of pressure rise set direction for the sake of security.
Certainly, those skilled in the art can also convert above table, such as represent the rate of climb by the force value of pot inner pressure rising per second after reaching 30Kpa, the rate of climb that above-mentioned 10s/10Kpa is corresponding can also be expressed as 1Kpa/s, the rate of climb that 12s/10Kpa is corresponding can also be expressed as 0.83Kpa/s etc., does not enumerate herein.
In the embodiment of the present invention, the hypothesis upper pressure time is 8min to 9min, then corresponding rate of pressure rise is 10s/10Kpa.
3) calculate the pressure differential between described goal pressure and the reference pressure of setting, hypothetical target pressure is 45Kpa, then pressure differential is 15Kpa.
4) calculate described delay time according to described pressure differential and rate of pressure rise, with 10s/10Kpa in the embodiment of the present invention, can determine to need to rise 15Kpa on the basis of 30Kpa, the required time is 15s, so delay time is 15s again.
If second does not adopt the mode of pressure time to determine rate of pressure rise, quantity of food then can be adopted in pot to determine rate of pressure rise, here quantity of food mainly refers to the content of material that can change into steam in electric pressure cooking saucepan, as moisture etc., the timing action now in above-mentioned 301 processes just can be omitted.Determine that the process of described delay time comprises according to quantity of food in the embodiment of the present invention:
1) quantity of food in the pot that in detection pot, quantity of food or acquisition user determine, user by corresponding button directly by the quantity of food input in electric pressure cooking saucepan, or can install corresponding water level detector, is detected the quantity of food in pot by water temperature probe.
2) quantity of food and the rate of pressure rise table of comparisons can be preset in the embodiment of the present invention in control circuit, then in this table of comparisons, search the rate of pressure rise corresponding with determined quantity of food, the concrete rate of climb is expressed mode and can be adopted but be not limited to the mode in the first scheme.
Rate of pressure rise in the embodiment of the present invention refers to: reach the pressure 30Kpa of low-grade pressure switch disconnection at pot inner pressure after, corresponding rate of pressure rise.
3) calculate the pressure differential between described goal pressure and the reference pressure of setting, hypothetical target pressure is 45Kpa, then pressure differential is 15Kpa.
4) calculate described delay time according to described pressure differential and rate of pressure rise, with 10s/10Kpa in the embodiment of the present invention, can determine to need to rise 15Kpa on the basis of 30Kpa, the required time is 15s, so delay time is 15s again.
Because pressure switch generally has multiple pressure, so the reference pressure in the embodiment of the present invention can be selected to select in multiple pressure, and multiple reference pressure can be selected, so just can expand the hop count of electric pressure cooking saucepan Discrete control, improve the control fineness of electric pressure cooking saucepan.Certainly, pressure that generally can be minimum in selection pressure switch, as reference pressure, is equivalent to the low and middle-grade pressure switch of selection pressure switch and disconnects corresponding pressure as reference pressure.
When the reference pressure switch that selection reference pressure is corresponding, pressure corresponding to pressure switch can be set in advance in a program as reference pressure, can select according to goal pressure difference, such as: the pressure switch comprising the different size pressure of multiple setting at electric pressure cooking saucepan, above-mentioned control device is therefrom selected opening pressure to reach goal pressure to have pressure switch corresponding to minimum deviation value as reference pressure switch, and control device controls to produce when culinary art pressure reaches reference pressure to press signal.
When pressure switch comprises low tension switch and high-voltage switch gear, in order to the selection of different reference pressure can be carried out for food in corresponding pot, the heating rate of fuzzy pressure control unit judges cooking food in the embodiment of the present invention, if when the heating rate of cooking food is greater than the benchmark heating rate preset in the memory unit, fuzzy pressure control Unit selection low tension switch is as reference pressure switch; Otherwise fuzzy pressure control Unit selection high-voltage switch gear is as reference pressure switch.The measurement of concrete heating rate can adopt but be not limited to: measure temperature difference and the time difference calculates heating rate; Or measure pressure differential and time difference, after pressure differential is converted into temperature difference, calculate heating rate.
The upper pressure time that in the embodiment of the present invention, timing unit calculates can be from electric pressure cooking saucepan, be heated to culinary art pressure reach the reference pressure time used, also can be reach the reference pressure time used to culinary art pressure from electric pressure cooking saucepan heats after the scheduled time.
Embodiment three:
On the basis of above-described embodiment two, the embodiment of the present invention also provides a kind of compress control method of electric pressure cooking saucepan, adopt on the electric pressure cooking saucepan of the method and also comprise the compensation pressure switch of goal pressure being carried out to deviation compensation, the described time delay heating period is further comprising the steps of: timing unit calculates from reference pressure switch motion to the incremental time Δ t compensating pressure switch action
0, control device is according to incremental time Δ t
0with the benchmark increment Delta t preset in the memory unit
bcomparative result correction heating parameter W
mto reduce to cook the deviation that pressure reaches goal pressure.
The embodiment of the present invention increases by one at control device and detects the compensation pressure switch compensating pressure, and compensate pressure and be greater than described reference pressure, when goal pressure is greater than reference pressure, the method provided according to embodiment one is needed to carry out Stress control, but, if goal pressure is also greater than compensation pressure, in order to make the Stress control of electric pressure cooking saucepan more accurate, as shown in Figure 4, pressure controlled adjustment is carried out as follows during specific implementation:
401, the culinary art pressure of electric pressure cooking saucepan is added up from reaching reference pressure to reaching the incremental time Δ t compensating pressure;
402, in order to determine whether reach the effect of anticipation in the time delay heating period, need incremental time Δ t and the benchmark increment Delta t be preset in electric pressure cooking saucepan
bcompare, and select the corresponding heating parameter Δ W that compensates to carry out error compensation to heating parameter Wm according to comparative result.Benchmark increment Delta t in the embodiment of the present invention
bfrom reference pressure to reaching the theoretical required time compensated needed for pressure, if Δ t and Δ t
bidentical, then represent whether the time delay heating period reaches the effect of anticipation, does not need to adjust.If Δ t and Δ t
bnot identical, then represent the effect not reaching anticipation, need to adjust accordingly, be exactly specifically: at Δ t than Δ t
bwhen little, perform 403; At Δ t than Δ t
bwhen large, perform 404.
403, at Δ t than Δ t
bwhen little, represent shorter than theoretical time to the compensation pressure actual consumption time from reference pressure, show that the rate of pressure rise of electric pressure cooking saucepan is than fast in theory, so need shorten the heat time of time delay heating period or reduce the heating power of time delay heating period.During specific implementation, the embodiment of the present invention needs according to described Δ t and Δ t
bdifference shorten heat time of time delay heating period, such as: the subsequent heat time can be shortened according to the ratio of difference and benchmark increase and decrease amount; Or according to described Δ t and Δ t
bdifference reduce the heating power of time delay heating period, also can reduce actual heating power according to the ratio of difference and benchmark increase and decrease amount.
404, at Δ t than Δ t
bwhen large, represent longer than theoretical time to the compensation pressure actual consumption time from reference pressure, show that the rate of pressure rise of electric pressure cooking saucepan is than slow in theory, so need extend the heat time of time delay heating period or increase the heating power of time delay heating period.The embodiment of the present invention can according to described Δ t and Δ t
bdifference extend heat time of time delay heating period, as: extend the subsequent heat time according to the ratio of difference and benchmark increase and decrease amount; Or according to described Δ t and Δ t
bdifference increase the heating power of time delay heating period, as: increase actual heating power according to the ratio of difference and benchmark increase and decrease amount.
After adopting the embodiment of the present invention, owing to adding the compensation pressure switch detecting and compensate pressure, and when goal pressure is greater than compensation pressure, the adjustment of time delay heating period can also be carried out by compensating the detection of pressure, thus make culinary art terminate rear culinary art pressure can more close to goal pressure.
The embodiment of the present invention is mainly used in various electric pressure cooking saucepan, especially for use in electric pressure cooking saucepan or Electromagnetic Heating electric pressure cooking saucepan.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. an automatic pressure-controlled electric pressure cooking saucepan, comprise pot cover, pot body, pot courage, for detection and control culinary art pressure change control device; It is characterized in that, described control device comprises the setting reference pressure switch of reference pressure and the fuzzy pressure control unit of set target pressure; Culinary art pressure touches reference pressure switch motion when reaching reference pressure and sends pressure signal, fuzzy pressure control unit inspection presses the time on upper pressure signal timed unit calculates, and fuzzy pressure control unit reaches goal pressure according to pressure time controling culinary art pressure on this from reference pressure, described goal pressure is greater than described reference pressure.
2. electric pressure cooking saucepan automatic pressure-controlled according to claim 1, it is characterized in that, induction kettle courage produces change in displacement displacement induction installation by the effect of culinary art pressure is provided with in described pot body, when culinary art pressure reaches reference pressure, displacement induction installation touches reference pressure switch motion and sends pressure signal.
3. automatic pressure-controlled electric pressure cooking saucepan according to claim 1, is characterized in that, described fuzzy pressure control unit comprises computing module and selects module.
4. electric pressure cooking saucepan automatic pressure-controlled according to claim 2, is characterized in that, described displacement induction installation comprises the elastic supporting member for supporting optical member of support pot courage and touches the touch pole of reference pressure switch.
5. electric pressure cooking saucepan automatic pressure-controlled according to any one of Claims 1-4, is characterized in that, described reference pressure switch is bimetal leaf flash switch or microswitch.
6. one kind is applied to the compress control method of electric pressure cooking saucepan described in any one of claim 1 to 5, it is characterized in that, described control device also comprises memory cell and timing unit, is preset with and reaches heating parameter sequence W needed for goal pressure for controlling to cook pressure from reference pressure in memory cell
n, and with heating parameter W
ncorresponding sequence t fiducial time
n, described compress control method comprises with the next stage, and order is carried out:
The stage is pressed in heating: control device startup is heated to reference pressure switch and sends pressure signal, timing unit calculates upper pressure time t
0;
The time delay heating period: fuzzy pressure control unit determines sequence t fiducial time
nin with upper pressure time t
0corresponding t fiducial time
m(m≤n), and select heating parameter sequence W
nin with t fiducial time
mcorresponding heating parameter W
mtime delay is heated to goal pressure.
7. the compress control method of electric pressure cooking saucepan according to claim 6, is characterized in that, described control device also comprises the compensation pressure switch for carrying out deviation compensation to goal pressure, and the described time delay heating period is further comprising the steps of:
Timing unit calculates from reference pressure switch motion to the incremental time Δ t compensating pressure switch action
0, control device is according to incremental time Δ t
0with the benchmark increment Delta t preset in the memory unit
bcomparative result correction heating parameter W
mto reduce to cook the deviation that pressure reaches goal pressure.
8. the compress control method of electric pressure cooking saucepan according to claim 6, is characterized in that, described electric pressure cooking saucepan comprises the pressure switch of the different size pressure of multiple setting, and in described heating, the pressure stage is further comprising the steps of:
Control device is therefrom selected opening pressure to reach goal pressure to have pressure switch corresponding to minimum deviation value as reference pressure switch, and control device controls to produce when culinary art pressure reaches reference pressure to press signal.
9. the compress control method of electric pressure cooking saucepan according to claim 8, is characterized in that, described pressure switch comprises low tension switch and high-voltage switch gear, and in described heating, the pressure stage is further comprising the steps of:
The heating rate of described fuzzy pressure control unit judges cooking food, if when the heating rate of cooking food is greater than the benchmark heating rate preset in the memory unit, fuzzy pressure control Unit selection low tension switch is as reference pressure switch; Otherwise fuzzy pressure control Unit selection high-voltage switch gear is as reference pressure switch.
10. the compress control method of the electric pressure cooking saucepan according to any one of claim 6 to 9, is characterized in that, described heating parameter is heating power and/or heat time.
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| CN102429574B true CN102429574B (en) | 2014-12-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102920317A (en) * | 2012-11-08 | 2013-02-13 | 浙江绍兴苏泊尔生活电器有限公司 | Cooking method of electric heating appliance |
| CN104422556A (en) * | 2013-09-02 | 2015-03-18 | 美的集团股份有限公司 | Electric pressure cooker and pressure detecting device and method thereof |
| CN104000473B (en) * | 2014-05-30 | 2017-01-04 | 浙江绍兴苏泊尔生活电器有限公司 | Control method of household electric heating cooking appliance |
| CN105527999B (en) * | 2015-12-23 | 2018-11-09 | 珠海格力电器股份有限公司 | Temprature control method of the pressure cooker in packing stage, device and system |
| CN108497916B (en) * | 2017-02-28 | 2020-11-20 | 佛山市顺德区美的电热电器制造有限公司 | Pressure cooking utensil and be used for pressure cooking utensil's pressure measurement |
| CN109124322B (en) * | 2017-06-16 | 2021-09-21 | 佛山市顺德区美的电热电器制造有限公司 | Control method of pressure cooker |
| CN109124331B (en) * | 2017-06-28 | 2021-09-14 | 松下知识产权经营株式会社 | Rice cooker |
| CN107348831B (en) * | 2017-07-20 | 2020-08-11 | 佛山市顺德区纳邦电器有限公司 | Electric cooker capable of correcting heating time and heating control method thereof |
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Address after: Huaiyin District of Ji'nan City, Shandong Province, 250117 US 999 miles Patentee after: Joyoung Company Limited Address before: Xinsha Road, Huaiyin District of Ji'nan city of Shandong Province, No. 12 250118 Patentee before: Joyoung Company Limited |