阅读说明：本技术 流速控制方法及其冲泡机台 (Flow velocity control method and brewing machine platform thereof ) 是由 林致得 于 2021-03-29 设计创作，主要内容包括：本发明公开一种流速控制方法以及一种冲泡机台,冲泡机台配合流速控制方法进行使用,并存有多个脉宽调变信号与多个预设流速值,而冲泡机台实际运作时包含以下流程：目标流速值被建立,而其中一个预设流速值符合目标流速值以设为撮合流速值,其中一个脉宽调变信号对应于撮合流速值以设为执行脉宽调变信号；冲泡机台通过执行脉宽调变信号而提供液体,并感测液体的流速以形成实际流速值；当实际流速值不同于目标流速值时,执行脉宽调变信号配合液体的温度与提供液体的出水时间进行演算以形成调整脉宽调变信号；最后,冲泡机台依据调整脉宽调变信号而改变液体的流速,使实际流速值能等同于目标流速值,冲泡机台通过流速控制方法能提供流速稳定的液体。(The invention discloses a flow rate control method and a brewing machine, wherein the brewing machine is used in cooperation with the flow rate control method and is provided with a plurality of pulse width modulation signals and a plurality of preset flow rate values, and the brewing machine comprises the following procedures in actual operation: establishing a target flow rate value, wherein a preset flow rate value is matched with the target flow rate value to be set as a matched flow rate value, and a pulse width modulation signal is set to be a pulse width modulation signal corresponding to the matched flow rate value; the brewing machine station provides liquid by executing a pulse width modulation signal and senses the flow rate of the liquid to form an actual flow rate value; when the actual flow velocity value is different from the target flow velocity value, performing calculation by matching the pulse width modulation signal with the temperature of the liquid and the water outlet time for providing the liquid to form an adjusted pulse width modulation signal; finally, the brewing machine station changes the flow rate of the liquid according to the adjustment pulse width modulation signal, so that the actual flow rate value can be equal to the target flow rate value, and the brewing machine station can provide the liquid with stable flow rate through a flow rate control method.)

1. A flow rate control method, used in conjunction with a brewing machine, the brewing machine having stored therein a plurality of PWM signals and a plurality of preset flow rates, each of the PWM signals corresponding one-to-one to one of the preset flow rates, the flow rate control method comprising:

a setting step: the brewing machine station is set to form a target flow rate value;

a matching step: the brewing machine station sets one preset flow velocity value which accords with the target flow velocity value as a matched flow velocity value, and sets the pulse width modulation signal corresponding to the matched flow velocity value as an execution pulse width modulation signal;

a liquid supply step: the brewing machine station adjusts the opening degree of the brewing machine station according to the execution pulse width modulation signal, so that liquid can flow to form an actual flow velocity value;

a flow rate verification step: checking the actual flow rate value and the target flow rate value, and when the difference between the actual flow rate value and the target flow rate value does not accord with an allowable value, forming a compensation instruction by the brewing machine;

A compensation step: the brewing machine station senses the temperature of the liquid and the water outlet time of the brewing machine station for supplying the liquid according to the compensation instruction, and calculates the execution pulse width modulation signal in cooperation with the temperature of the liquid and the water outlet time of the brewing machine station for supplying the liquid to form an adjustment pulse width modulation signal; and

a liquid supply adjusting step: the brewing machine table changes the opening degree of the brewing machine table according to the adjusting pulse width modulation signal, so that the flow speed of the liquid can be increased or decreased, and further the actual flow speed value can be converted into an adjusting flow speed value, so that the error between the adjusting flow speed value and the target flow speed value can reach the range of the allowable value.

2. The flow rate control method according to claim 1, wherein in the flow rate verification step, when the difference between the actual flow rate and the current preset flow rate falls within the range of the allowable value, the brewing machine generates a measured flow command;

and the flow rate control method further comprises:

a flow rate checking step: the brewing machine station senses the total flow of the liquid according to the flow measuring instruction to form an actual flow value, and generates a stopping instruction when the actual flow value is the same as a preset flow value; and

A liquid supply stopping step: the brewing machine table closes the opening of the brewing machine table according to the stopping instruction so as to stop providing the liquid.

3. The flow rate control method according to claim 2, wherein in performing the flow rate verification step, when the actual flow rate value is different from the preset flow rate value, the flow rate verification step is repeated.

4. The flow rate control method according to claim 1, wherein the brewing machine obtains a first correction parameter and a second correction parameter according to the temperature of the liquid and the time for the brewing machine to supply the liquid, and the adjusting PWM signal is calculated by executing the PWM signal and the first and second correction parameters.

5. The flow rate control method according to claim 4, wherein in the compensating step, the executing PWM signal, the first correction parameter and the second correction parameter select a first algorithm to form the adjusting PWM signal when the actual flow rate is greater than the target flow rate, and the executing PWM signal, the first correction parameter and the second correction parameter select a second algorithm different from the first algorithm to form the adjusting PWM signal when the actual flow rate is less than the target flow rate.

6. A brewing machine table is characterized by comprising:

a water supply unit for providing a liquid;

the storage unit is used for storing a plurality of pulse width modulation signals and a plurality of preset flow rate values representing the flow rate of the liquid, and each pulse width modulation signal corresponds to one preset flow rate value one to one;

an input unit for forming a target flow rate value representing the expected flow rate of the liquid;

the processing unit is electrically connected with the storage unit and the input unit, can set one preset flow velocity value which accords with the target flow velocity value as a matched flow velocity value, and sets the pulse width modulation signal corresponding to the matched flow velocity value as a pulse width modulation executing signal;

the control valve is used for receiving the execution pulse width modulation signal and adjusting the opening of the control valve according to the execution pulse width modulation signal; and

the sensing unit is used for sensing the flow rate and the temperature of the liquid flowing out of the water supply unit and the water outlet time for supplying the liquid by the water supply unit, so that the sensing unit can form an actual flow rate value representing the actual flow rate of the liquid, an actual temperature value representing the current temperature of the liquid and an actual time value representing the current water outlet time for supplying the liquid by the water supply unit;

When the processing unit finds that the difference between the actual flow rate value and the target flow rate value does not accord with an allowable value, the processing unit forms a compensation instruction, calculates the execution pulse width modulation signal according to the compensation instruction and the temperature of the liquid and the water outlet time of the liquid provided by the water supply unit to form an adjustment pulse width modulation signal, so that the control valve changes the opening degree of the control valve through the adjustment pulse width modulation signal, and the flow rate of the liquid can be increased or decreased to convert the actual flow rate value into an adjustment flow rate value, so that the error between the adjustment flow rate value and the target flow rate value can reach the range of the allowable value.

7. The machine as claimed in claim 6, further comprising a buffer unit electrically connected to the processing unit, the buffer unit being configured to store the PWM execution signal, and the buffer unit being configured to delete the PWM execution signal when the machine stops operating.

8. The apparatus as claimed in claim 7, wherein the pwm signal is written into the buffer unit, such that the buffer unit stores the pwm signal, and when the buffer unit stores the pwm signal, the buffer unit deletes the pwm signal to enable the buffer unit to store only a single pwm signal.

9. A brewing machine station as claimed in claim 6, characterized in that said sensing unit has a flow meter for sensing the flow rate of said liquid, said flow meter being located between said water supply unit and the control valve.

Technical Field

The present invention relates to a flow rate control method capable of controlling a flow rate of liquid and a brewing machine thereof, and more particularly, to a flow rate control method capable of increasing or decreasing a flow rate of liquid according to a flow rate of liquid, a temperature of the liquid, and a water discharge time of the liquid provided by the brewing machine and a brewing machine thereof.

Background

With the change of the food culture, not only food materials have various characteristics, but also the conditioning modes of various food materials are changed quite much, and even the drinking liquid beverage can see quite a plurality of supply modes in a workshop due to the variety and the convenience.

At present, beverage shops specially selling beverages exist in the market, and the beverage shops can adjust the cold and hot degrees and the sweetness of the beverages according to the preference of consumers, but at present, the beverage shops manually make the beverages, and the brewing experiences of different brewing personnel are different, so that the flavors of the beverages brewed by different brewing personnel are different, however, even if the same brewing personnel brew the same beverage, the flavors of the beverages are slightly different due to different liquid flow rates, therefore, no matter the brewing personnel with insufficient experience or the brewing personnel with rich experience brew the beverages, the beverages with different flavors can be brewed by the brewing personnel with different tastes

Disclosure of Invention

The invention mainly aims to control the flow rate of liquid by the brewing machine table through a flow rate control method, so that when different brewing personnel brew the same brewing substance, the same brewing substance can brew the same liquid with the same flow rate, and the same beverage can keep the same taste and flavor.

The secondary purpose of the invention is to change the arrangement relationship among the water supply unit, the flow meter and the control valve, so that in the process that the heated liquid flows from the water supply unit to the flow meter, the liquid can not generate bubbles due to high temperature, and the flow meter can accurately sense the flow rate of the liquid.

To achieve the above object, the flow rate control method of the present invention is used in conjunction with a brewing machine, the brewing machine having stored therein a plurality of pwm signals and a plurality of preset flow rate values, each of the pwm signals corresponding to one of the preset flow rate values one-to-one, the flow rate control method comprising: a setting step, a matching step, a liquid supplying step, a flow rate checking step, a compensating step and a liquid supply adjusting step.

The setting step comprises: the brewing machine station is set to form a target flow rate value; matching: the brewing machine station sets one preset flow velocity value which accords with the target flow velocity value as a matched flow velocity value, and sets the pulse width modulation signal corresponding to the matched flow velocity value as an execution pulse width modulation signal.

The liquid supplying step: the brewing machine adjusts the opening degree of the brewing machine according to the execution pulse width modulation signal, so that liquid can flow to form an actual flow rate value, and the flow rate checking step comprises the following steps: the actual flow rate value and the target flow rate value are checked, and when the difference between the actual flow rate value and the target flow rate value does not accord with an allowable value, the brewing machine forms a compensation instruction. The compensation step comprises: the brewing machine station senses the temperature of the liquid and the water outlet time of the brewing machine station for supplying the liquid according to the compensation instruction, and calculates the execution pulse width modulation signal in cooperation with the temperature of the liquid and the water outlet time of the brewing machine station for supplying the liquid to form an adjustment pulse width modulation signal; and the liquid supply adjusting step: the brewing machine table changes the opening degree of the brewing machine table according to the adjusting pulse width modulation signal, so that the flow speed of the liquid can be increased or decreased, and further the actual flow speed value can be converted into an adjusting flow speed value, so that the error between the adjusting flow speed value and the target flow speed value can reach the range of the allowable value.

In this embodiment, in the step of checking the flow rate, when the difference between the actual flow rate and the current preset flow rate falls within the range of the allowable value, the brewing machine generates a measured flow command, and the flow rate control method further includes: a flow rate verification step and a flow rate verification step.

The flow rate checking step: the brewing machine station senses the total flow of the liquid according to the flow measuring instruction to form an actual flow value, and generates a stopping instruction when the actual flow value is the same as a preset flow value, and in addition, a liquid supply stopping step comprises the following steps: the brewing machine closes the opening of the brewing machine according to the stop instruction to stop providing the liquid, and in a preferred embodiment, when the flow rate checking step is performed, and when the actual flow rate value is different from the preset flow rate value, the flow rate checking step is repeated.

Wherein, during the compensation step, the brewing machine station obtains a first compensation parameter and a second compensation parameter according to the temperature of the liquid and the water outlet time for supplying the liquid by the brewing machine station, the PWM signal is adjusted by the calculation of the PWM signal, the first correction parameter and the second correction parameter, and, when the actual flow rate value is greater than the target flow rate value during the compensating step, the executing PWM signal, the first correction parameter and the second correction parameter select a first algorithm to form the adjusting PWM signal, and when the actual flow velocity value is smaller than the target flow velocity value, the execution pulse width modulation signal, the first correction parameter and the second correction parameter select a second algorithm different from the first algorithm to form the adjustment pulse width modulation signal.

The brewing machine table mainly comprises a water supply unit, a storage unit, an input unit, a processing unit, a control valve and a sensing unit, wherein in the embodiment, the water supply unit is used for providing liquid, the storage unit is stored with a plurality of pulse width modulation signals and a plurality of preset flow rate values representing the flow rate of the liquid, and each pulse width modulation signal corresponds to one preset flow rate value one to one.

However, the input unit is used for forming a target flow rate value representing the expected flow rate of the liquid, the processing unit is electrically connected to the storage unit and the input unit, one preset flow rate value which meets the target flow rate value can be set as a matched flow rate value, and the pulse width modulation signal corresponding to the matched flow rate value is set as a pulse width modulation signal.

In addition, the control valve is used for receiving the execution pulse width modulation signal and adjusting the opening degree of the control valve according to the execution pulse width modulation signal, and the sensing unit is used for sensing the flow rate and the liquid temperature of the liquid flowing out of the water supply unit and the water outlet time of the liquid supplied by the water supply unit, so that the sensing unit can form an actual flow rate value representing the actual flow rate of the liquid, an actual temperature value representing the current temperature of the liquid and an actual time value representing the current water outlet time of the liquid supplied by the water supply unit.

When the processing unit finds that the difference between the actual flow rate value and the target flow rate value does not accord with an allowable value, the processing unit forms a compensation instruction, calculates the execution pulse width modulation signal according to the compensation instruction and the temperature of the liquid and the water outlet time of the liquid provided by the water supply unit to form an adjustment pulse width modulation signal, so that the control valve changes the opening degree of the control valve through the adjustment pulse width modulation signal, and the flow rate of the liquid can be increased or decreased to convert the actual flow rate value into an adjustment flow rate value, so that the error between the adjustment flow rate value and the target flow rate value can reach the range of the allowable value.

In this embodiment, the brewing machine further has a buffer unit electrically connected to the processing unit, the buffer unit is configured to store the execution pwm signal, and when the brewing machine stops operating, the buffer unit deletes the execution pwm signal, wherein the adjustment pwm signal can be written into the buffer unit, so that the buffer unit can store the adjustment pwm signal, and when the buffer unit stores the adjustment pwm signal, the buffer unit deletes the execution pwm signal, so that the buffer unit only stores a single pwm signal.

Furthermore, the sensing unit has a flow meter for sensing the flow rate of the liquid, and the flow meter is located between the water supply unit and the control valve.

The invention is characterized in that when the processing unit detects that the difference between the actual flow rate value and the matched flow rate value does not conform to the allowable value, the processing unit calculates the pulse width modulation signal according to the temperature of the liquid and the water outlet time of the liquid provided by the water supply unit to form a pulse width modulation signal, and transmits the pulse width modulation signal to the control valve to make the control valve change the opening of the control valve by adjusting the pulse width modulation signal, and then the flow rate of the liquid can be increased or decreased to convert the actual flow rate value into the adjusted flow rate value, so that the difference between the adjusted flow rate value and the target flow rate value can reach the allowable value range, therefore, when different brewing personnel brew the same brewing object, the same brewing substance can perform brewing action by the liquid with the same flow rate, so that the same beverage can not have inconsistent taste.

In addition, the flowmeter of sensing unit sets up between water supply unit and control valve for the flowmeter can be close to in water supply unit, and then when water supply unit provides the liquid after the heating, the higher liquid of temperature can flow through the flowmeter in the short time, causes the in-process of the liquid after the heating from water supply unit stream to flowmeter, and liquid can not be because of the higher and bubble of production of temperature so that the flowmeter can be accurate the velocity of flow of sensing liquid.

Drawings

FIG. 1 is a schematic illustration of the steps of the flow rate control method of the present invention;

FIG. 2 is a block diagram of a brewing machine according to the present invention;

FIG. 3 is a schematic diagram of the setting step and the matching step in FIG. 1;

FIG. 4 is a schematic view of the liquid supplying step in FIG. 1;

FIG. 5 is a schematic diagram of the flow rate verification step of FIG. 1;

FIG. 6 is a schematic diagram of the compensation step of FIG. 1;

FIG. 7 is a schematic illustration of a liquid supply adjustment step of FIG. 1;

FIG. 8 is a schematic view showing the flow rate verification step being performed again;

FIG. 9 is a schematic illustration of the flow verification step of FIG. 1;

FIG. 10 is a schematic view showing a liquid supply stopping step in FIG. 1.

Description of reference numerals: 1-flow rate control method; 11-setting step; 12-matching step; 13-liquid supply step; 14-flow rate check step; 15-a compensation step; 16-liquid supply adjustment; 17-flow check step; 18-liquid supply stopping step; 2-a brewing machine platform; 21-a water supply unit; 211-a heater; 212-a holding tank; 22-a storage unit; 23-a buffer unit; 24-an input unit; 25-a processing unit; 26-a control valve; 27-a sensing unit; 271-a flow meter; 272-a temperature sensor; 273-time sensor; 274-flow sensor.

Detailed Description

The invention will be further described with reference to specific embodiments and drawings, the advantages and features of which will become apparent as the description proceeds.

Referring to fig. 1 and 2, a flow rate control method 1 of the present invention is used in conjunction with a brewing machine 2, in this embodiment, the brewing machine 2 has a water supply unit 21, a storage unit 22, a buffer unit 23, an input unit 24, a processing unit 25, a control valve 26 and a sensing unit 27, the water supply unit 21 can provide a liquid and has two parts, namely a heater 211 and a heat preservation tank 212, the heater 211 can heat the liquid to increase the temperature of the liquid, and the heated liquid can flow into the heat preservation tank 212 for heat preservation, however, the storage unit 22 stores a plurality of pulse width modulation signals, a plurality of preset flow rate values, three first correction parameters, two second correction parameters, two algorithms, an allowable value and a preset flow value, wherein the signal content of each pulse width modulation signal is different, and each pulse width modulation signal corresponds to one of the preset flow rate values in a one-to-one manner, each preset flow rate value is used for representing the flow rate which is expected to be reached by the liquid, and the value of each preset flow rate value is different.

In this embodiment, the parameter values of each of the first correction parameters are different, and each of the first correction parameters corresponds to one of the preset temperature values representing the temperature of the liquid, in this embodiment, the parameter value of one of the first correction parameters is number 5, the parameter value of the other one of the first correction parameters is number 7, and the parameter value of the last one of the first correction parameters is number 10, where the first correction parameter with the parameter value of number 5 is suitable for the case where the temperature of the liquid is less than 79 ℃, the first correction parameter with the parameter value of number 7 is suitable for the case where the temperature of the liquid is between 80 ℃ and 90 ℃, and the first correction parameter with the last parameter value of number 10 is suitable for the case where the temperature of the liquid is greater than 91 ℃.

In addition, the parameter value of one of the second correction parameters is different from the parameter value of the other one of the second correction parameters, and each of the second correction parameters corresponds to one of the preset time values representing the water outlet time of the liquid provided by the water supply unit 21, in this embodiment, the parameter values of the two second correction parameters are respectively the number 0 and the number 1, wherein the second correction parameter with the parameter value of the number 0 is suitable for the case that the water outlet time of the liquid provided by the water supply unit 21 is less than 10 seconds, and the second correction parameter with the parameter value of the number 1 is suitable for the case that the water outlet time of the liquid provided by the water supply unit 21 is greater than 11 seconds.

However, the operation formulas of the two third algorithms are different from each other, in this embodiment, one of the algorithms has the operation formula of a + (B + C), and the algorithm having the operation formula of a + (B + C) is set as a first algorithm, wherein the first algorithm is applied in a state where an actual flow rate value representing the actual flow rate of the liquid is less than a target flow rate value representing the expected flow rate of the liquid, another algorithm of the algorithm has an operation formula of a- (B +2C), and an algorithm having an operation formula of a- (B +2C) is set as a second algorithm, wherein the second algorithm is applied in a state where the actual flow rate value is greater than the target flow rate value, and further, the allowable value indicates that the difference between the actual flow rate value and the target flow rate value is within an allowable range, and the preset flow rate value indicates the total flow rate to be achieved by the liquid.

As shown in fig. 2, the buffer unit 23 is used for storing information, the input unit 24 is used for generating information, wherein the processing unit 25 is electrically connected to the storage unit 22, the buffer unit 23, the input unit 24 and the control valve 26, in addition, the control valve 26 can control the flow rate of the liquid, and the sensing unit 27 has a flow meter 271, a temperature sensor 272, a time sensor 273 and a flow sensor 274, in this embodiment, the flow meter 271 is used for sensing the flow rate of the liquid, and the flow meter 271 is located between the heat preservation tank 212 of the water supply unit 21 and the control valve 26 and is electrically connected to the processing unit 25, wherein the temperature sensor 272 is used for sensing the temperature of the liquid and is electrically connected to the processing unit 25, in addition, the time sensor 273 is used for sensing the water outlet time of the liquid provided by the water supply unit 21, and the flow sensor 274 is electrically connected to the processing unit 25, and to sense the total flow of the liquid.

Referring to fig. 1 and 3, in the specific application, firstly, the user forms the target flow rate value through the input unit 24 to complete a setting step 11, and then, the input unit 24 transmits the target flow rate value to the processing unit 25, the processing unit 25 compares each preset flow rate value with the target flow rate value, the processing unit 25 selects the preset flow rate value corresponding to the target flow rate value from the plurality of preset flow rate values to set the selected preset flow rate value as a matched flow rate value, the pwm signal corresponding to the matching flow rate is set as an execution pwm signal, and then the processing unit 25 copies the matching flow rate and the execution pwm signal to the buffer unit 23, so that the buffer unit 23 stores the matching flow rate and the execution pwm signal to complete the matching step 12.

Referring to fig. 1 and 4, after the matching step 12 is completed, a liquid supplying step 13 is performed, in which the processing unit 25 transmits the pulse width modulation signal from the buffer unit 23 to the control valve 26, so that the control valve 26 opens the opening of the control valve 26 according to the pulse width modulation signal, and the heated liquid can flow out of the thermal insulation tank 212 of the water supply unit 21, so that the heated liquid firstly flows through the flow meter 271 of the sensing unit 27 and then flows into the control valve 26, wherein when the heated liquid flows out of the thermal insulation tank 212 of the water supply unit 21, the flow meter 271 of the sensing unit 27 senses the actual flow rate of the liquid per unit time to form the actual flow rate value, and simultaneously, the temperature sensor 272 of the sensing unit 27 senses the actual temperature of the liquid per unit time to form an actual temperature value representing the current temperature of the liquid, in addition, the time sensor 273 of the sensing unit 27 also senses the current flowing time of the liquid per unit time to form an actual time value indicating the current water outlet time of the liquid, and the flow sensor 274 of the sensing unit 27 senses the total flow rate of the liquid flowing out of the liquid thermal insulation tank 212 to form an actual flow rate value indicating the total flow rate of the liquid, thereby completing the liquid supplying step 13, wherein when the flow meter 271, the temperature sensor 272 and the time sensor 273 respectively form the actual flow rate value, the actual temperature value and the actual time value, the sensing unit 27 transmits the actual flow rate value, the actual temperature value and the actual time value to the processing unit 25, in this embodiment, the flow meter 271, the temperature sensor 272 and the time sensor 273 sense the liquid per unit time to form a plurality of actual flow rate values, actual temperature values and actual time values, A plurality of said actual temperature values and a plurality of said actual time values, whereby a plurality of said actual flow rate values, a plurality of said actual temperature values and a plurality of said actual time values are received by the processing unit 25.

Since the flow meter 271 of the sensing unit 27 is disposed between the water supply unit 21 and the control valve 26, the flow meter 271 can be close to the water supply unit 21, and when the water supply unit 21 supplies the heated liquid, the liquid with a higher temperature can flow through the flow meter 271 in a short time, so that in the process that the heated liquid flows from the water supply unit 21 to the flow meter 271, the liquid does not generate bubbles due to the higher temperature, and the flow meter 271 can accurately sense the flow rate of the liquid to form the actual flow rate value with correct information content.

Referring to fig. 1 and 5, after the liquid supplying step 13 is completed, a flow rate checking step 14 is performed, in which the flow meter 271 of the sensing unit 27 senses the actual flow rate of the liquid at present per unit time, so that the flow meter 271 forms a plurality of actual flow rate values, and the processing unit 25 receives the actual flow rate values, and when the processing unit 25 receives the actual flow rate values, the processing unit 25 determines whether the difference between each of the actual flow rate values and the target flow rate value meets the allowable value.

Referring to fig. 1 and 6, when the processing unit 25 finds that the difference between the actual flow rate value and the target flow rate value per unit time does not meet the allowable value, the processing unit 25 forms a compensation command and starts a compensation step 15, when the compensation step 15 is performed, the processing unit 25 obtains the actual flow rate value, the actual temperature value and the actual time value according to the compensation command, and obtains the first correction parameter, the second correction parameter and the algorithm from the storage unit 22 according to the actual flow rate value, the actual temperature value and the actual time value at that time, and then the processing unit 25 calculates the execution pwm signal, the first correction parameter and the second correction parameter according to the algorithm to form an adjustment pwm signal with a value different from the execution pwm signal, and transmitting the adjusted pwm signal to the buffer unit 23, so that the adjusted pwm signal can be written into the buffer unit 23, and the buffer unit 23 can store the adjusted pwm signal, wherein when the buffer unit 23 stores the adjusted pwm signal, the buffer unit 23 deletes the executed pwm signal, and the buffer unit 23 only stores a single pwm signal.

In this embodiment, when the processing unit 25 finds that the difference between the actual flow rate value at the 4 th second and the matched flow rate value does not meet the allowable value, the processing unit 25 reads that the actual temperature value at the 4 th second is 85 ℃, and the actual temperature value with 85 ℃ as the information content is between 80 ℃ and 90 ℃, so that the processing unit 25 can obtain the first correction parameter with the parameter value of number 7, and then, the processing unit 25 reads that the actual time value at the 4 th second is 4 seconds in total, and that the actual time value with 4 seconds as the information content is less than 10 seconds in total, so that the processing unit 25 can obtain the second correction parameter with the parameter value of number 0, and then, the processing unit 25 reads that the actual flow rate value at the 4 th second is 20c.c per second, because the actual flow rate value with 20c.c per second is less than the target flow rate value with 25 per second as 25c.c, enabling the processing unit 25 to obtain the first algorithm with the parameter value as an operational formula a + (B + C), and then enabling the processing unit 25 to bring the execution pwm signal, the first correction parameter, and the second correction parameter into A, B, C position in the first algorithm in sequence, so that the execution pwm signal, the first correction parameter, and the second correction parameter perform four operations according to the third correction parameter to obtain the adjusted pwm signal, wherein when the actual flow rate value is greater than the target flow rate value, the processing unit 25 can obtain the second algorithm with the parameter value as an operational formula a- (B + 2C).

Referring to fig. 1 and 7, after the compensation step 15 is completed, a liquid supply adjusting step 16 is performed, the processing unit 25 transmits the adjusted pulse width modulation signal stored in the buffer unit 23 to the control valve 26, so that the control valve 26 changes the opening degree of the control valve 26 according to the adjusted pulse width modulation signal, and further, after the liquid flows out of the heat preservation tank 212 of the water supply unit 21, the flow rate of the liquid can be increased, so as to complete the liquid supply adjusting step 16, and then, the flow rate checking step 14 can be performed, wherein when the flow rate of the liquid is increased, the flow meter 271 of the sensing unit 27 senses the liquid with the increased flow rate, so that the flow meter 271 senses the latest flow rate of the liquid to form an adjusted flow rate value with a flow rate value greater than the actual flow rate value, and at the same time, the temperature sensor 272 of the sensing unit 27 also senses the liquid with the increased flow rate, the temperature sensor 272 senses the latest temperature of the liquid to form an adjusted temperature value, and the time sensor 273 of the sensing unit 27 also senses the liquid with the increased flow rate, so that the time sensor 273 senses the latest water outlet time of the liquid provided by the water supply unit 21 to form an adjusted time value.

Referring to fig. 1 and 8, the flow rate checking step 14 is performed again, when the flow meter 271 of the sensing unit 27 forms the adjusted flow rate value, the flow meter 271 transmits the adjusted flow rate value to the processing unit 25, when the processing unit 25 receives the latest adjusted flow rate value, the processing unit 25 determines whether the difference between the adjusted flow rate value and the target flow rate value meets the allowable value, and when the difference between the adjusted flow rate value and the matched flow rate value does not meet the allowable value, the compensation step 15 and the liquid supply adjusting step 16 are repeated, however, when the difference between the adjusted flow rate value and the target flow rate value reaches the allowable range, the processing unit 25 forms a measurement flow command and performs a flow rate checking step 17 as shown in fig. 9.

Referring to fig. 1 and 9, in the flow rate checking step 17, the processing unit 25 compares the actual flow rate value with the preset flow rate value according to the measured flow rate command to determine whether the actual flow rate value is the same as the preset flow rate value, wherein when the processing unit 25 determines that the actual flow rate value is not the same as the preset flow rate value, since the flow rate of the liquid provided by the water supply unit 21 may be changed, the flow rate checking step 14 needs to be performed again, wherein when the processing unit 25 determines that the actual flow rate value is the same as the preset flow rate value, the processing unit 25 generates a stop command and starts to perform a liquid supply stopping step 18, as shown in fig. 1 and 10, in the liquid supply stopping step 18, the processing unit 25 transmits the stop command to the control valve 26 to close the opening of the control valve 26 through the stop command, further, the liquid will not flow out from the heat preservation tank 212 of the water supply unit 21, and finally, the brewing machine 2 stops operating, and the buffer unit 23 deletes the adjusted pwm signal and the matched flow rate value.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.