Baking Working Method of Electric Oven

Abstract

The present invention discloses a baking working method of an electric oven, applied to the oven for driving a barbecue fork rotating shaft to rotate food to be baked by a motor, comprising the following steps: S1, measuring the period T.sub.0 when a barbecue fork is unloaded; S2, fixing the food onto the barbecue fork, and measuring the period T.sub.1 when the barbecue fork is loaded; S3, calculating the weight M.sub.1 of the food on the barbecue fork, M.sub.1=(T.sub.1/T.sub.0).sup.2*M.sub.0, wherein M.sub.0 is the default weight when the barbecue fork is unloaded; S4, setting the baking time and/or temperature according to the food weight M.sub.1. According to the present invention, the weight of loaded food is calculated by detecting the periods when the barbecue fork rotating shaft is unloaded and loaded, and the weighing of the food is realized while the mounting is simple, so that the baking time and temperature are reasonably set, the electric oven is preferably self-adaptive to food with different weights, and automatic cooking of the food is realized.

Claims

1. A baking working method of an electric oven, applied to the oven for driving a barbecue fork rotating shaft to rotate food to be baked by a motor, characterized by comprising the following steps: S1, measuring the period T.sub.0 when a barbecue fork is unloaded; S2, fixing the food onto the barbecue fork, and measuring the period T.sub.1 when the barbecue fork is loaded; S3, calculating the weight M.sub.1 of the food on the barbecue fork, M.sub.1=(T.sub.1/T.sub.0).sup.2*M.sub.0, wherein M.sub.0 is the default weight when the barbecue fork is unloaded; and S4, setting the baking time and/or temperature according to the food weight M.sub.1.

2. The baking working method of an electric oven according to claim 1, characterized in that the measurement of T.sub.0 and T.sub.1 is realized through the following method: a grille rotary plate, which synchronously rotates with the barbecue fork rotating shaft, and is installed on the barbecue fork rotating shaft; an infrared transmitting and receiving device is installed on the outside of the grille rotary plate, which comprises a transmitter and a receiver, a signal is transmitted by the transmitter from one side of the rotary plate and received by the receiver on the other side of the rotary plate when passing through the grilles, and the interval of the receiver receiving the signal twice is the rotation period of the barbecue fork.

3. The baking working method of an electric oven according to claim 1, characterized in that, in the step S4, when the weight M.sub.1 is large, the baking time is increased, and the rotation slows down; and when the weight M.sub.1 is small, the baking time is reduced, and the rotation speeds up.

4. The baking working method of an electric oven according to claim 1, characterized in that, in the step S4, when the weight M.sub.1 is large, the baking temperature is increased, and the rotation slows down; and when the weight M.sub.1 is small, the baking temperature is reduced, and the rotation speeds up.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The specific embodiments of the present invention are further described with reference to the following accompanying drawings.

[0013] FIG. 1 is a diagrammatic drawing of an electric oven provided with a grille rotary plate and an infrared transmitting and receiving device according to the present invention;

[0014] FIG. 2 is a diagrammatic drawing of the grille rotary plate;

[0015] FIG. 3 is a diagrammatic drawing of the infrared transmitting and receiving device;

[0016] FIG. 4 is a drawing of a comparison circuit for calculating rotation period;

[0017] FIG. 5 is a drawing of a waveform generated when a barbecue fork is unloaded;

[0018] FIG. 6 is a drawing of a waveform generated when the barbecue fork is loaded.

DESCRIPTION OF EMBODIMENTS

[0019] As shown in FIG. 1 to FIG. 3, in order to implement the detection of food weight for an oven 10 according to the present invention, a rotary plate 30, which synchronously rotates with a barbecue fork rotating shaft 20 and is provided with grilles 301, is installed on the barbecue fork rotating shaft 20, an infrared transmitting and receiving device 40 is installed on the outside of the rotary plate 30, the infrared transmitting and receiving device 40 comprises a transmitter 401 and a receiver 402, a signal is transmitted by the transmitter 401 from one side of the rotary plate 30 and received by the receiver 402 on the other side of the rotary plate 30 when passing through the grilles 301, and the interval of receiving the signal twice in succession by the receiver 402 is the rotation period of a barbecue fork.

[0020] The baking working method according to the present invention comprises the following steps:

[0021] S1, measuring the period T.sub.0 when the barbecue fork is unloaded;

[0022] S2, fixing the food onto the barbecue fork, and measuring the period T.sub.1 when the barbecue fork is loaded;

[0023] S3, calculating the weight M.sub.1 of the food on the barbecue fork, M.sub.1=(T.sub.1/T.sub.0).sup.2*M.sub.0, wherein M0 is the default weight when the barbecue fork is unloaded;

[0024] S4, setting the baking time and/or temperature according to the food weight M.sub.1. In the step S4, when the weight M.sub.1 is large, the baking time is increased, and the rotation slows down; and when the weight M.sub.1 is small, the baking time is reduced, and the rotation speeds up. In the step S4, when the weight M.sub.1 is large, the baking temperature is increased, and the rotation slows down; and when the weight M.sub.1 is small, the baking temperature is reduced, and the rotation speeds up.

[0025] As shown in FIG. 4, J1 is a receiver port in FIG. 3, wherein J1-1 is GND (Grounded), J1-2 is an infrared receiving signal, J1-3 is 5V power supply for control, LED_SW is a single chip microcomputer controlled emitting switch to prevent from causing LED aging due to long-time switching-on, SIGNAL_GRID is a device signal source to access a single chip microcomputer for signal acquisition.

[0026] As shown in FIG. 5 and FIG. 6, the waveform period generated when the barbecue fork is unloaded is different from that when the barbecue fork is loaded. The period obtained in FIG. 5 is T.sub.0, and the period obtained in FIG. 6 is T.sub.1.

[0027] As the diameter of the rotary plate in FIG. 2 is definite in size, the circumference is definite and is denoted by S. Suppose that the rotation of the whole circumference is a uniform acceleration process, the distance S=0.5*a*t.sup.2, then the accelerated speed a=2S/t.sub.2, and the traction force F=M*a.

[0028] Under the condition that the traction force of the motor is constant, the equation that M.sub.0*2S/T.sub.0.sup.2=M.sub.1*2S/T.sub.1.sup.2 is obtained, and finally the equation that M.sub.1=(T.sub.1.sup.2/T.sub.0.sup.2)*M.sub.0 is obtained, wherein M.sub.0 is the default weight when the barbecue fork is unloaded and can be regard as gross weight, T.sub.0 is the rotation period when the barbecue fork rotating shaft is unloaded, T.sub.1 is the rotation period when the barbecue fork rotating shaft is loaded, and M.sub.1 is the food weight obtained through calculation.

[0029] Therefore, as long as the SINGAL_GRID signal is on an interrupt interface outside an MCU (Microprogrammed Control Unit), the weight change of the food can be obtained in combination with the periodic change obtained by a timer. And then, the weight of the food on the barbecue fork is obtained. It is indicated that the slower the rotation is, the heavier the food on the barbecue fork rotating shaft is; and the faster the rotation is, the lighter the food on the barbecue fork rotating shaft is.

[0030] The above mentioned is just the preferable embodiments of the present invention, but the present invention is not limited to the above embodiments, and the technical solution for realizing the purpose of the present invention in basically same means belongs to the scope of protection in the present invention.