JPH05172335A - Heating cooking apparatus - Google Patents

Abstract

PURPOSE:To accurately detect an end of cooking time by correcting a deviation of an initial value of an optical sensor for sensing a generating amount of substance for shutting OFF a light such as smoke, etc., to be generated in a cooking chamber. CONSTITUTION:A relay RL3 is turned ON at the initial time of starting to heat to cook thereby to drive a blower motor BM, thereby discharging smoke generated upon scorching of oil, etc., at the time of previous cooking out of a cooking chamber. Input of a detected value from an optical sensor 7 to a smoke sensor 12 is stopped during this period. When a predetermined time is elapsed and the discharge of the smoke is finished, the motor BM is stopped, and the detected value from the sensor 7 is stored as an initial value in a memory of a controller 10. A deviation from the detected value from the sensor 7 thereafter is sequentially obtained. When the deviation reaches a set value, a relay RL4 is turned OFF to stop heaters 3, 4 thereby to finish heating to cook.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker equipped with a heater for heating an object to be cooked.

[0002]

2. Description of the Related Art Generally, in this type of cooking device,
Equipped with an optical sensor that projects light from the light source to the cooking object placed in the cooking chamber and captures the reflected light from the cooking object, the optical sensor detects the transition of the reflected light intensity and the reflected light has a predetermined value. When the temperature falls below the range, or when the amount of reflected light received decreases to a predetermined amount due to smoke generated in the cooking chamber, water vapor, or the like, a technique for ending cooking heating has been proposed (JP-A-61-265429). , F24C 7/08).

[0003]

However, in such a conventional heating cooker, at the beginning of cooking, smoke generated due to burning of oil or the like adhering to the cooking chamber, heater, etc. at the time of previous cooking There was a problem that the initial value of the optical sensor was likely to change depending on the amount, and the cooking end time could not be accurately detected.

The present invention has been made in view of the above circumstances, and its purpose is to accurately set the initial value of the optical sensor without being affected by smoke or the like generated at the beginning of heating and cooking. It is possible to provide a heating cooker capable of detecting the normal cooking end time.

[0005]

A cooking device according to the present invention includes a cooking chamber in which an object to be cooked is placed, a heater for heating the item to be cooked in the cooking chamber, and the object to be cooked is heated. A heating cooker equipped with an optical sensor for detecting the amount of a light blocking substance sometimes generated in the cooking chamber, a means for discharging the light blocking substance generated in the cooking chamber to the outside at the beginning of heating cooking, and a light blocking substance. Immediately after the end of the discharge of the, the memory that stores the value detected by the optical sensor as an initial value, means for obtaining the deviation between the detected value of the optical sensor and the initial value after that, and the deviation reaches the set value. And a means for controlling heating of the heater.

[0006]

According to the present invention, the light-blocking substance such as smoke generated at the beginning of cooking and heating is temporarily discharged to the outside of the cooking chamber, and the value detected by the optical sensor at the end of discharging is stored in the memory as the initial value. Since it is memorized, it is possible to set accurate initial values without being affected by the smoke generated by the oil etc. adhering to the heater etc. during the previous cooking at the beginning of cooking, and the cooking end Accurate detection of the time point is also possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 1 is a vertical cross-sectional view of a heating cooker according to the present invention, in which reference numeral 1 is a hollow frame 2
Indicates a cooking chamber in the frame 1. Inside the frame 1, upper and lower heaters 3 and 4, a magnetron 5 and the like are arranged together with the cooking chamber 2. The cooking chamber 2 has a frame 1
It is formed in the shape of a hollow box that is smaller than this,
A saucer 9 for the food to be cooked G is installed therein, and for example, when the food to be cooked G is raw fish or the like, it is placed on a net 9a arranged on the saucer 9.

A gard motor GM for rotating the lower heater 4 and the pan 9 is installed in the lower part of the cooking chamber 2, an upper heater 3 and an exhaust duct 6 are additionally installed in the upper part thereof, and a magnetron 5 is installed in the upper part of the side wall. It is attached. 8 is a high voltage transformer.

The exhaust duct 6 includes the cooking chamber 2 and the frame 1.
It is arranged between the exhaust hole opened in the side wall of the frame 1 and the exhaust hole of the frame 1 to guide the gas in the cooking chamber 2 to the outside. Inside the exhaust duct 6 and in the vicinity of the exhaust hole, an optical sensor 7 is installed with its light source and a photodetector for receiving light from the light source facing each other with a gas passage therebetween. When there is no light blocking substance such as smoke or water vapor in the air flowing through the exhaust duct 6, the light receiving amount of the photodetector is large, and the light receiving amount of the photodetector decreases as the light blocking substance amount increases. It will be.

FIG. 2 is an electric circuit diagram showing the main part of the cooking control system. A power supply of AC 100 V, a monitor switch SW, a series circuit of a lamp L for the cooking chamber and a relay RL1, a series of a geared motor GM and a relay RL2. Circuit, a series circuit of blower motor BM and relay RL3, a series circuit of upper heater 3 and relay RL4, a series circuit of lower heater 4 and relay RL5, and a series circuit of magnetron 5 and relay RL6 with a high-voltage transformer interposed. Each is connected in parallel.

Reference numeral 10 is a control circuit equipped with a microcomputer, and a smoke detection including a keyboard 11 and an optical sensor 7 for setting various cooking modes and the like, setting control of a lamp L for the cooking chamber, a gard motor GM, a blower motor BM and the like. Circuit 12
And relays RL1 to RL6, which are used to control heating. In addition, 13 is a fuse, 14 is a door switch, and 15 is a thermal fuse.

Next, the operation of the heating cooker according to the present invention will be described with reference to FIG.
It will be described according to the flowchart shown in FIG. Cooking mode,
Key in the other necessary data using the keyboard 11.
(Step S1) For example, when the automatic grill course is selected as the cooking mode (Step S2), when the start key is pressed (Step S3), cooking by the automatic grill course is started (Step S4).

When the set value ΔV ₀ , which is the finishing level of cooking, is set through the keyboard 11 (step S5), the relay RL4 is turned on and the upper heater 3 is heated (step S5).
6) Then, the relay RL3 is turned on (step S7).
By the heating of the upper heater 3, the upper heater 3, the net 9a, or the like is heated at the beginning of cooking, and the oil or the like adhering to them during the previous cooking is burned to generate smoke in the cooking chamber 2. This smoke is discharged from the cooking chamber 2 to the outside through the exhaust duct 6 by the blower motor BM.

At step S7, at the same time when the relay RL3 is turned on, the timer for setting the initial value in the optical sensor 7 is reset, and the reading prohibition circuit for prohibiting the detection value from the optical sensor 7 from being taken into the memory in the control circuit is read. The operating time of is automatically set (step S8). As a result, the detection value of the optical sensor 7 is controlled so as not to be taken into the memory in the control circuit until the timer counts out.

For the timer, a time for prohibiting the detection value of the optical sensor 7 from being stored in the memory, for example, 3 minutes is set (step S9), and the timer is counted down.
When the timer counts out (step S10) (step S11), the relay RL3 is turned off (step S12), the blower motor BM is stopped, and the prohibition of capturing the detection value of the optical sensor 7 is released. After the cancellation, the first value detected by the optical sensor 7 is stored in the memory as the initial value V _1.
(Step S13).

After that, the detected value V ₂ of the optical sensor 7 is sequentially taken into the microcomputer of the control circuit at a predetermined timing, and the difference ΔV between V _{2 and} V ₁ is obtained (step S15),
This difference ΔV is compared with the finishing level ΔV ₀ initially set, and it is determined whether ΔV ₀ ≦ ΔV (step S16). Δ
When V ₀ ≦ ΔV, the heating end signal is output (step S17), the relay RL4 is turned off (step S18), the upper heater 3 is stopped, the cooking end buzzer is sounded (step S19), and the operation waits. .. If necessary, additional heat is started.

[0017]

As described above, in the heating cooker according to the present invention, the first value detected by the optical sensor after the light-blocking substance generated in the cooking chamber is removed outside the cooking chamber at the beginning of the cooking and heating start. Take in as an initial value, compare with the detection value of the optical sensor after that based on this, by determining whether the difference exceeds the set value, it is possible to detect the end of accurate cooking, etc. The present invention has excellent effects.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a heating cooker according to the present invention.

FIG. 2 is an electric circuit diagram showing a control system of the heating cooker according to the present invention.

FIG. 3 is a flowchart showing a cooking process of the heating cooker of the present invention.

[Explanation of symbols]

 1 frame 2 cooking chamber 3 upper heater 4 lower heater 5 magnetron 6 exhaust duct 7 optical sensor 8 high voltage transformer 9 saucer 9a net 10 control circuit 11 keyboard 12 smoke detection circuit RL1 ~ RL6 relay L lamp in cooking chamber GM guard motor BM blower motor

Claims (1)

[Claims] 1. A cooking chamber in which an object to be cooked is placed, a heater for heating the object to be cooked placed in the cooking chamber, and an amount of a light blocking substance generated in the cooking chamber when the object to be cooked is heated. In a heating cooker equipped with an optical sensor for detecting, a means for discharging the light blocking substance generated in the cooking chamber to the outside at the beginning of heating cooking, and the light sensor detecting immediately after the discharge of the light blocking substance is completed. A memory for storing a value as an initial value, means for obtaining a deviation between the detected value of the optical sensor and the initial value thereafter, and means for performing heating control on the heater when the deviation reaches a set value A cooking device characterized by the above.