[0060] The one-key control method for food baking of the present invention will be described in detail below in conjunction with the embodiments and the drawings.
[0061] The one-key control method for food baking of the present invention is applied to an oven with automatic weighing, such as figure 1 , figure 2 As shown, a tray 1 is provided in the cavity of the oven, a grill 3 for placing food is provided on the tray 1, and the legs of the grill 3 penetrate the bottom of the tray 1, and the tray 1 is provided with The bracket 9 for fixing the gravity sensor 2, the bracket 9 is elastically arranged under the tray 1, and can sense the pressure of the legs of the grill 3, and a roasting tube for baking is arranged above the oven cavity 7. The oven cavity is also provided with a steam emission device and a fan 4 for circulating hot air. The steam emission device includes a water tank 5 for storing water, a steam heating pipe 8 for generating steam, and a water tank 5 The steam water pump 6 provided to the steam heating pipe 8.
[0062] The one-key control method for food baking of the present invention, such as image 3 As shown, the main control steps are as follows:
[0063] 1) Initialization settings. Initialization settings are some initial settings of the internal program of the microcontroller, such as configuring timers, common I/O input and output directions, buzzer control port waveforms, etc., as well as the initial values of some global variables, such as those used Timing variable, weight steam variable, initial opening and closing state of barbecue tube, etc.;
[0064] 2) To judge whether to activate the one-key flag, it is to enter the next step, otherwise continue to judge whether to activate the one-key flag;
[0065] After pressing the start button, always remember this one-button sign before the end of the barbecue;
[0066] 3) Judge whether the preheating flag is equal to 1, it is to enter the next step, otherwise it will enter the preheating stage;
[0067] 4) Judging whether to put food, it is to go to the next step, otherwise it will enter the preheating stage;
[0068] 5) Set accumulated heating time T;
[0069] 6) Judge whether 15 times of weight collection has been carried out, it is to go to the next step, otherwise it will go to the preheating stage;
[0070] 7) Judge whether it has entered the first heating time T1 and the second heating time T2, it is to enter the next step, otherwise it enters the phase of obtaining the food weight;
[0071] The phase of obtaining food weight includes the following steps:
[0072] 15) Take the last 10 food weights and calculate the average value W;
[0073] 16) According to the relationship between the food and the weight W, calculate the first heating time T1 and the second heating time T2, and the required amount of steam m, and then enter the eighth step. Which said:
[0074] The first heating time T1=0.0056W+6.2235,
[0075] The second heating time T2=0.01754W+2.4342,
[0076] The required amount of steam m = 0.094W-2.6.
[0077] 8) Judge whether the first heating time T1 is greater than or equal to the accumulated heating time T, it is to enter the first baking stage, otherwise, enter the next step;
[0078] 9) Determine whether the accumulated heating time T is greater than the first heating time T1, and is less than or equal to the sum of the first heating time T1 and the second heating time T2, it is entering the second baking stage, otherwise, it enters the next step;
[0079] 10) Determine whether the cumulative heating time T is greater than the sum of the first heating time T1 and the second heating time T2, and is less than or equal to the sum of the first heating time T1 and the second heating time T2 plus 2, if yes Turn on the buzzer, return to the second step after baking is complete, otherwise go to the next step;
[0080] 11) Judge whether the accumulated heating time T is greater than the sum of the first heating time T1 and the second heating time T2 plus 2, it is to turn off the buzzer, the one-key sign ends and return to the second step, otherwise directly return to the second step .
[0081] The warm-up phase described in the main control step includes the following steps:
[0082] 12) Judge whether the temperature of the cavity is greater than 230°C, enter the next step, otherwise turn on the full power heating of the grill tube (1600W), and then return to the second step;
[0083] 13) Determine whether the buzzer has sounded, if yes, turn off the buzzer and return to the second step, otherwise go to the next step;
[0084] 14) Make the preheating sign equal to 1, turn on the buzzer, turn it off after three beeps, then turn off the grill and return to the second step.
[0085] When the preheating is over, the opening and closing signal of the oven door is used as the judgment condition of whether the food is put in.
[0086] The first baking stage described in the main control step includes the following steps:
[0087] 17) Judge whether the temperature of the cavity is greater than 235°C, if yes, close the roasting tube and return to the second step, otherwise, go to the next step;
[0088] 18) Judge whether the cavity temperature is less than 225°C, if yes, turn on the full power heating of the grill tube (1600W), and then return to the second step, otherwise directly return to the second step.
[0089] That is, the first stage of baking food, full power, keep 230 ℃, baking time is T1. The full power of the currently applied baking tube is 1600W.
[0090] The second baking stage described in the main control step includes the following steps:
[0091] 19) Start to spray steam and perform steam control;
[0092] 20) Judge whether the temperature of the cavity is greater than 205°C, if yes, close the roasting tube and return to the second step, otherwise, go to the next step;
[0093] 21) Determine whether the temperature of the cavity is less than 195°C, if yes, turn on the baking tube for heating, and use reduced power heating (900W), and then return to the second step, otherwise directly return to the second step.
[0094] That is, in the second stage of baking the food, the power is reduced, steam is added, and the temperature is maintained at 200°C, and the baking time is T2. The currently applied baking tube is 900W when the power is reduced.
[0095] The steam control described in the second baking stage includes the following steps:
[0096] 22) To judge whether the steam volume m is equal to zero, go to the 24th step, otherwise go to the next step;
[0097] 23) The steam time Tm increases automatically, and then enters the 26th step;
[0098] 24) Calculate the required steam volume m based on the food weight W, that is, the required steam volume m = 0.094W-2.6;
[0099] 25) Calculate the water spray interval T3 in the second heating time T2 according to the steam volume m;
[0100] 26) Determine whether the steam time Tm is equal to the water spray interval time T3, where the water spray interval time T3=T2/(m/1.1), is to go to the next step, otherwise go to the 28th step;
[0101] 27) Turn off the steam pump and steam heating pipe, and make the steam time Tm equal to zero;
[0102] 28) Judge whether the steam time Tm is greater than or equal to the water spray interval time T3-0.2, then go to the next step, otherwise go to the 30th step;
[0103] 29) Turn on the steam pump;
[0104] 30) Judge whether the steam time Tm is greater than or equal to the water spray interval time T3-5.2, then proceed to the next step, otherwise proceed to the 32nd step;
[0105] 31) Turn on the steam heating pipe;
[0106] 32) To judge whether the second heating time T2 is over, it is to return to the 20th step of the main program, otherwise return to the 22nd step;
[0107] Features of the one-key control method for food baking of the present invention:
[0108] 1) The pumping time is 0.2s each time, and the pumping volume is 1.1g in 0.2s, T3=T2/(m/1.1), generally T3≥5s.
[0109] 2) During the water spray interval T3, the steam heating pipe works for 5.2 seconds and the water pump works for 0.2 seconds. That is, the steam heating tube is heated for 5 seconds in advance before each water pumping, so that the pumped water quickly turns into steam and is sprayed into the cavity, enhancing the humidity and maintaining the moisture inside the food.
[0110] 3) It overcomes the dry burning that the steam heating pipe works all the time and the steam water pump pumps little water; it also solves the problem that the steam water pump keeps working at low water temperature and reduces the temperature of the cavity.
[0111] The one-button control method for food baking of the present invention is based on the original time control, and considers the sensor to automatically sense the weight to truly realize the one-button automatic menu and research and design a new control method:
[0112] 1. This logic first requires preheating to the required temperature of the food, which is 230°C for chicken wings. If the preheating is over and food is not put in for a long time, the cavity will keep the preheating temperature until it is put in.
[0113] 2. The key to the whole process is the stable and perceived weight of the food. The T1, T2 and steam volume m calculated by W should be based on the rules of cooking experience.
[0114] 3. The baking process is divided into 2 stages. The high temperature of T1 stage can ensure that the skin is crispy and less oily. The cooling of T2 stage makes the color better, and the steam can ensure the moisture and tenderness of the food. In addition, reducing power at T2 has a power saving effect.
[0115] 4. It will stop automatically at the end of the two-stage baking, with one-key operation from beginning to end.
