Baking machine and temperature control method thereof

Abstract

A temperature control method of a roaster, comprising: selecting a first temperature control target curve to be executed and generating a second temperature control target curve according to the first temperature control target curve; acquiring a first temperature measured by a first temperature sensor in real time, wherein the first temperature sensor is arranged in a containing space surrounded by a shell; acquiring a second temperature measured by a second temperature sensor in real time, wherein the second temperature sensor is arranged outside the shell; calculating a first control value for controlling the output power of the roaster according to the first temperature and the first temperature control target curve; calculating a second control value for controlling the output power of the roaster according to the second temperature and the second temperature control target curve; calculating a third control value by weighting the first control value and the second control value; and controlling the output power of the roaster by the third control value. The application further provides a roaster using the above method.

Description

Technical Field

[0001] This invention relates to baking machines, and particularly to a baking machine and its temperature control method that uses dual data for temperature control. Background Technology

[0002] Coffee and tea are widely popular among modern consumers, not only for their stimulating properties but also, in recent years, as a leisure trend that reflects personal taste. Therefore, the flavor of coffee and tea is a crucial indicator, and businesses are constantly researching ways to improve their taste. Experience shows that the roasting process of coffee beans or tea leaves is the primary factor affecting flavor; different roasting temperatures produce different flavors. In other words, to produce a specific flavor of coffee or tea, the roasting temperature must strictly adhere to its corresponding conditions; otherwise, the desired flavor cannot be achieved.

[0003] As mentioned above, many temperature-controlled baking machines have emerged. These existing baking devices monitor data such as the temperature or even the color of the food being baked, and control the output power of the heater based on this data to maintain the baking temperature within the required range.

[0004] However, during the heating process, although the output power of the heater is controlled based on monitored data, the heater itself also absorbs and stores heat energy in addition to heating the food being baked. This causes the heater to release radiant heat as its temperature rises, essentially acting as another heat source. The food being baked receiving this extra heat energy may cause its temperature to deviate from the predetermined temperature control process, resulting in baking failure. Summary of the Invention

[0005] To address the aforementioned problems, the present invention provides a temperature control method for a baking machine, wherein the baking machine has a housing surrounding an accommodating space, and the temperature control method includes: Select a first temperature control target curve to be executed and calculate and generate a second temperature control target curve based on the first temperature control target curve; A first temperature measured by a first temperature sensor is acquired in real time, wherein the first temperature sensor is disposed within the accommodating space; The second temperature is acquired in real time by a second temperature sensor, wherein the second temperature sensor is disposed on the outside of the housing; Based on the first temperature and the first temperature control target curve, a first control value that can be used to control the output power of the baking machine is calculated; Based on the second temperature and the second temperature control target curve, a second control value that can be used to control the output power of the baking machine is calculated; A third control value is obtained by weighting the first control value and the second control value together. The output power of the baking machine is controlled by this third control value.

[0006] Preferably, the housing is an inner liner of the baking machine, and the baking machine also has an outer liner, with the second temperature sensor disposed in a space between the inner liner and the outer liner.

[0007] Furthermore, the interlayer space is filled with thermal insulation material, and the second temperature sensor is disposed within the thermal insulation material.

[0008] Preferably, the second temperature control target curve is obtained by weighting the first temperature control target curve.

[0009] The aforementioned first control value is generated by calculating the proportional, integral, and derivative values ​​of the difference between the first temperature and the first temperature control target curve.

[0010] The aforementioned second control value is generated by calculating the proportional, integral, and derivative values ​​of the difference between the second temperature and the second temperature control target curve.

[0011] The present invention further provides a baking machine, which includes: A housing that encloses a receiving space; A first temperature sensor is disposed within the accommodating space; A second temperature sensor is disposed on the outside of the housing; A control unit is electrically connected to the first temperature sensor and the second temperature sensor. The control unit calculates a control value based on the temperature data measured by the first temperature sensor and the second temperature sensor, and controls the output power of the baking machine accordingly.

[0012] Preferably, the housing is an inner liner of the baking machine, and the baking machine also has an outer liner, with the second temperature sensor disposed in a space between the inner liner and the outer liner.

[0013] Furthermore, the interlayer space is filled with thermal insulation material, and the second temperature sensor is disposed within the thermal insulation material.

[0014] Preferably, the control unit is a proportional-integral-derivative controller. The control unit calculates and generates a second temperature control target curve based on the selected first temperature control target curve. The first temperature sensor measures a first temperature in real time, and the second temperature sensor measures a second temperature in real time. The control unit calculates the proportional, integral, and derivative values ​​of the difference between the first temperature and the first temperature control target curve to generate a first control value, and calculates the proportional, integral, and derivative values ​​of the difference between the second temperature and the second temperature control target curve to generate a second control value. The first control value and the second control value are then weighted and calculated to obtain a third control value for controlling the output power of the baking machine.

[0015] Preferably, the baking machine is provided with an input unit for selecting at least one first temperature control target curve built into the control unit. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the baking machine of the present invention; Figure 2 This is a cross-sectional schematic diagram of the baking machine of the present invention; Figure 3 This is a flowchart of the temperature control method of the present invention.

[0017] Explanation of reference numerals in the attached figures: Space 10 Inner liner 11 Outer liner 12 Mezzanine space 13 Thermal insulation material 14 Input Unit 15 Heater 2 Inner bucket 3 First temperature sensor 41 Second temperature sensor 42 Detailed Implementation

[0018] Please see Figure 1 , 2 The image shows a roasting machine 1 provided by the present invention, which has a cylindrical shell surrounding a space 10. This space 10 can accommodate an inner container 3 for holding roasted materials (such as coffee beans, tea leaves, etc.). In this embodiment, the shell serves as an inner liner 11, and an outer liner 12 is provided on its outer side. A sandwich space 13 is formed between the inner liner 11 and the outer liner 12. In this embodiment, the sandwich space 13 can be filled with a heat-insulating material 14, for example, heat-absorbing cotton. A heater 2, electrically connected to a control unit (not shown), is provided in the space 10, and its output power is controlled and adjusted by the control unit.

[0019] Given that the thermal insulation material 14 absorbs and stores heat during the baking process, and releases radiant heat after heating, causing the baked goods to be affected by additional heat energy beyond that of the heater 2, the baking machine of the present invention is equipped with two temperature sensors. A first temperature sensor 41 is located in the space 10 of the baking machine, extending through the inner drum 3 into the pile of baked goods to detect the temperature of the baked goods. A second temperature sensor 42 is embedded in the thermal insulation material 14 within the interlayer space 13 to detect the temperature of the thermal insulation material 14. The temperature data collected by these two temperature sensors 41 and 42 will serve as a reference for controlling the output power of the heater 2. In this embodiment, the first and second temperature sensors 41 and 42 are K-type thermocouples.

[0020] The two temperature sensors 41 and 42 are electrically connected to the control unit, allowing the control unit to receive temperature data from two locations on the baking machine and generate a signal to control the output power of the baking machine heater 2. In this embodiment, the control unit is a proportional-integral-derivative (PID) controller, which consists of a proportional unit, an integral unit, and a derivative unit, corresponding to the current error, past cumulative error, and future error of the baking process, respectively, to calculate how much power the baking machine heater needs to output.

[0021] With the above structure, the temperature control method of the baking machine of the present invention is as follows: Figure 3 As shown, it includes: Select a first temperature control target curve to be executed and calculate and generate a second temperature control target curve based on the first temperature control target curve; The first temperature measured by the first temperature sensor is acquired in real time; The second temperature measured by the second temperature sensor is acquired in real time; Based on the first temperature and the first temperature control target curve, a first control value that can be used to control the output power of the baking machine is calculated; Based on the second temperature and the second temperature control target curve, a second control value that can be used to control the output power of the baking machine is calculated; A third control value is obtained by weighting the first control value and the second control value together. The output power of the baking machine is controlled by this third control value.

[0022] In the above method, a first temperature control target curve to be executed is first selected on an input unit 15 of the baking machine. The first temperature control target curve represents the target temperature of the baked object as the baking time progresses. It can be a basic file built into the control unit or a custom file stored by the user in the control unit.

[0023] Next, the control unit calculates and generates a second temperature control target curve based on the selected first temperature control target curve. This second temperature control target curve represents the target temperature of the thermal insulation material located between the inner and outer chambers of the baking machine as baking time progresses. In this embodiment, the second temperature control target curve is obtained through weighted calculation based on the first temperature control target curve selected by the user. The weights used in the above calculation are estimated based on the average temperature difference between the baked object and the thermal insulation material during the heating process, for example, 1.15.

[0024] After determining the first and second temperature control target curves, during the actual heating process, the first temperature of the object being baked is detected in real time by the first temperature sensor, and the second temperature of the thermal insulation material is detected in real time by the second temperature sensor. The control unit receives the first temperature data, compares it with the first temperature control target curve, calculates the proportional, integral, and derivative values ​​of the two, and then generates a first control value for controlling the output power of the baking machine; this first control value represents the adjustment control of the heater based on the real-time temperature of the object being baked. Simultaneously, the control unit receives the second temperature data, compares it with the second temperature control target curve, calculates the proportional, integral, and derivative values ​​of the two, and then generates a second control value for controlling the output power of the baking machine; this second control value represents the adjustment control of the heater based on the real-time temperature of the thermal insulation material.

[0025] Continuing from the above, the control unit further assigns weights to the first and second control values, performs a weighted calculation to obtain a third control value, and finally controls the output power of the heater based on this third control value. The significance of this third control value is that the control method of this invention fully considers the temperature of both the object being baked and the interlayer space, forming a closed-loop control system through feedback. This allows for the most suitable adjustment and control of the heater, more accurately controlling the actual temperature of the object being baked, making its temperature change trajectory more consistent with the predetermined first temperature control target curve. This reduces the additional impact of the heat energy stored in the insulation material on the object being baked, thereby reducing the probability of baking failure.

[0026] The above embodiments are disclosed only to illustrate the present invention and are not intended to limit the present invention. Any substitution of equivalent elements should still fall within the scope of the present invention.

[0027] In summary, it is clear to those skilled in the art that the present invention can indeed achieve the aforementioned objectives and complies with the provisions of the Patent Law; therefore, this application is filed in accordance with the law.

Claims

1. A temperature control method for a baking machine, wherein the baking machine has a housing, the housing being an inner liner of the baking machine and surrounding an accommodating space, the temperature control method comprising: Select a first temperature control target curve to be executed and calculate and generate a second temperature control target curve based on the first temperature control target curve; A first temperature measured by a first temperature sensor is acquired in real time, wherein the first temperature sensor is disposed within the accommodating space; The second temperature is acquired in real time by a second temperature sensor, wherein the second temperature sensor is disposed on the outside of the housing; Based on the first temperature and the first temperature control target curve, a first control value that can be used to control the output power of the baking machine is calculated; Based on the second temperature and the second temperature control target curve, a second control value that can be used to control the output power of the baking machine is calculated; The first control value and the second control value are weighted and calculated to obtain a third control value; The output power of the baking machine is controlled by this third control value. in, The baking machine also has an outer cavity, and the second temperature sensor is disposed in a space between the inner cavity and the outer cavity. The interlayer space is filled with thermal insulation material, and the second temperature sensor is disposed within the thermal insulation material.

2. The temperature control method for the baking machine as described in claim 1, wherein, The second temperature control target curve is obtained by weighting the first temperature control target curve.

3. The temperature control method for the baking machine as described in claim 1, wherein, The first control value is generated by calculating the proportional, integral, and derivative values ​​of the difference between the first temperature and the first temperature control target curve.

4. The temperature control method for the baking machine as described in claim 1, wherein, The second control value is generated by calculating the proportional, integral, and derivative values ​​of the difference between the second temperature and the second temperature control target curve.

5. A baking machine, comprising: A housing, which is an inner liner of the baking machine and surrounds an accommodating space; A first temperature sensor is disposed within the accommodating space to acquire a first temperature in real time; A second temperature sensor is disposed on the outside of the housing to obtain a second temperature in real time; A control unit, electrically connected to the first and second temperature sensors, has a first temperature control target curve and calculates a second temperature control target curve based on the first temperature control target curve. The control unit calculates a first control value based on the difference between the first temperature and the first temperature control target curve, and calculates a second control value based on the difference between the second temperature and the second temperature control target curve. The first and second control values ​​are then weighted to obtain a third control value, which is used to control the output power of the baking machine. in, The baking machine also has an outer cavity, and the second temperature sensor is disposed in a space between the inner cavity and the outer cavity. The interlayer space is filled with thermal insulation material, and the second temperature sensor is disposed within the thermal insulation material.

6. The baking machine as described in claim 5, wherein, The control unit is a proportional-integral-derivative controller. The first control value is obtained by the control unit calculating the proportional, integral, and derivative values ​​between the first temperature and the first temperature control target curve. The second control value is obtained by the control unit calculating the proportional, integral, and derivative values ​​between the second temperature and the second temperature control target curve. The second temperature control target curve is obtained by the control unit through weighted calculation based on the first temperature control target curve.

7. The baking machine as described in claim 5, wherein, The baking machine is equipped with an input unit for selecting at least one first temperature control target curve built into the control unit.

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