Coffee extraction method and device and coffee extraction equipment

Abstract

The invention relates to the technical field of coffee making, and discloses a coffee extraction method and device and coffee extraction equipment, and the method comprises the steps that flavor preferences selected by a user are obtained, and the flavor preferences comprise flavor types and flavor grades; constraint conditions of the extraction process are determined according to the flavor types, extraction parameters corresponding to different extraction stages in the extraction process are determined according to the constraint conditions and the flavor grades, and the extraction parameters comprise extraction flow rates; when coffee making enters an extraction process, extraction is carried out at different extraction stages according to corresponding extraction flow rates so as to obtain coffee conforming to flavor preference. The flow velocity in the extraction process is subjected to staged control based on the flavor preference of the user, so that the soluble substance extraction proportion of the coffee liquid in different extraction stages can be optimized, the flavor is accurately controlled, and the technical effects of improving the flavor expressive force of the coffee and enhancing the user experience and satisfaction are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coffee making, in particular to a coffee extraction method, a coffee extraction device and a coffee extraction equipment. BACKGROUND

[0002] Coffee is increasingly popular, and fully automatic coffee products are increasingly popular. However, according to different extraction parameters, the flavors of coffee are various, and the flavors preferred by users are also different. At present, the fully automatic coffee machines in the industry all adjust the flavors of coffee by adjusting the grinding degree, the powder amount and the temperature, and a fixed flow rate is used for extraction in the coffee making process, and users can adjust the above-mentioned parameters to meet their own needs.

[0003] However, users need to have sufficient knowledge of coffee to accurately adjust the above-mentioned parameters, and in fact, most users who purchase fully automatic coffee machines do not know how to adjust the flavors of coffee, which makes it difficult for users to accurately match their personal flavor preferences through the existing adjustment method, thereby weakening the overall quality of coffee drinks and user experience to some extent. SUMMARY

[0004] Therefore, the present application provides a coffee extraction method, a coffee extraction device and a coffee extraction equipment to solve the problem that users cannot accurately meet their personal flavor preferences by adjusting the parameters of the coffee machine.

[0005] In a first aspect, the present application provides a coffee extraction method, which comprises: obtaining a flavor preference selected by a user, the flavor preference comprising: a flavor type and a flavor level; determining a constraint condition of an extraction process according to the flavor type, and determining extraction parameters corresponding to different extraction stages in the extraction process according to the constraint condition and the flavor level, the extraction parameters comprising an extraction flow rate; and when the coffee making enters the extraction process, extracting at different extraction stages according to the corresponding extraction flow rate to obtain coffee meeting the flavor preference.

[0006] The coffee extraction method provided by the present application determines the extraction flow rate corresponding to each extraction stage in the extraction process according to the flavor preference selected by the user, extracts at different extraction stages according to the corresponding extraction flow rate in the coffee making process, and obtains coffee meeting the flavor preference. The present application controls the flow rate of the extraction process based on the flavor preference of the user, which can optimize the extraction ratio of soluble substances of coffee liquid at different extraction stages, realize accurate control of the flavor, and achieve the technical effects of improving the flavor expression of coffee, enhancing the user experience and satisfaction.

[0007] In an optional embodiment, the extraction parameters further include an extraction time, the constraint condition of the extraction process is determined according to the flavor type, and the extraction parameters corresponding to different extraction stages in the extraction process are determined according to the constraint condition and the flavor grade, including: obtaining a preset coffee liquid amount, a total time corresponding to the extraction process and an average flow rate; determining the extraction flow rate and the extraction time corresponding to different extraction stages according to the flavor preference, the coffee liquid amount, the total time and the average flow rate.

[0008] The present application can achieve different extraction liquid amounts in different extraction stages by determining the extraction flow rate and the extraction time of different extraction stages, and the overall extraction process does not exceed the originally set total time, avoiding under-extraction or over-extraction, and thus affecting the taste.

[0009] In an optional embodiment, the constraint condition of the extraction process is determined according to the flavor type, and the extraction flow rate and the extraction time corresponding to different extraction stages are determined according to the coffee liquid amount, the total time, the average flow rate and the constraint condition, including: determining the constraint condition of the extraction process according to the flavor type, the constraint condition being determined in advance according to the coffee liquid amount, the total time, the average flow rate and each extraction stage, including: a flow rate constraint condition, a time constraint condition and a liquid amount constraint condition; determining a first value range of the extraction flow rate, a second value range of the extraction time and a third value range of the extraction liquid amount corresponding to each extraction stage according to the coffee liquid amount, the total time, the average flow rate and the constraint condition; determining the extraction liquid amount corresponding to each extraction stage in the third value range according to the flavor grade; determining the extraction flow rate in the first value range based on the extraction liquid amount, and determining the extraction time in the second value range.

[0010] The present application can determine the value range of the extraction flow rate, the extraction time and the extraction liquid amount corresponding to different extraction stages according to the user-selected flavor type, and then determine the specific value according to the flavor grade, so as to obtain coffee that precisely meets the user's individualized flavor and improve the user's satisfaction.

[0011] In an optional embodiment, each extraction stage in the extraction process is in turn: an extraction front section, an extraction middle section and an extraction rear section, and extraction is performed according to the corresponding extraction flow rate in different extraction stages, including: after the extraction process starts, taking the extraction front section as the current extraction stage, and adjusting the flow rate according to the extraction flow rate corresponding to the current extraction stage; obtaining an extraction duration, and determining whether the duration reaches the extraction time corresponding to the current extraction stage; if so, taking the next extraction stage as the current extraction stage, and returning to the step of adjusting the flow rate according to the extraction flow rate corresponding to the current extraction stage, until the extraction process ends.

[0012] The present application can optimize the extraction ratio of soluble substances in different extraction stages of coffee liquid, realize accurate control of flavor components such as acid, sweet and bitter, improve the coffee flavor performance, and enhance the user experience and satisfaction by finely controlling the extraction process in stages.

[0013] In an optional embodiment, the flavor preference selected by the user is obtained, including: obtaining the flavor type selected by the user, the flavor type being any one of the following: acid-sweet flavor, high-sweet flavor, sweet-bitter flavor and bitter flavor; determining the flavor level corresponding to the flavor type.

[0014] The present application can control the coffee extraction process based on user preferences by providing the user with the option of flavor type, so that the user does not need to understand the specific parameters of the coffee making process, but only needs to focus on his own needs, thereby improving the user experience.

[0015] In an optional embodiment, the extraction flow rate corresponding to the extraction front section, the extraction middle section and the extraction rear section in the extraction process of the acid-sweet flavor decreases in turn, and the corresponding extraction time increases in turn; the extraction flow rate corresponding to the extraction middle section, the extraction front section and the extraction rear section in the extraction process of the high-sweet flavor decreases in turn, and the corresponding extraction time increases in turn; the extraction flow rate corresponding to the extraction middle section, the extraction rear section and the extraction front section in the extraction process of the sweet-bitter flavor decreases in turn, and the corresponding extraction time increases in turn; the extraction flow rate corresponding to the extraction rear section, the extraction middle section and the extraction front section in the extraction process of the bitter flavor decreases in turn, and the corresponding extraction time increases in turn.

[0016] The present application can make the extraction liquid volume ratio different in different extraction stages by adjusting the flow rate and time of different extraction stages, so as to determine the flavor of the final coffee according to the taste of the coffee extracted in different extraction stages, and provide different and more intuitive flavor options for the user.

[0017] In an optional embodiment, the coffee liquid amount of the extraction stage is m, the average flow rate of the extraction stage is v, the extraction flow rate of the front extraction stage is v1, the extraction flow rate of the middle extraction stage is v2, and the extraction flow rate of the rear extraction stage is v3, wherein (v1+v2+v3) / 3=v, and v1, v2, and v3 are all greater than v / 5 and less than 3v; the total time of the extraction stage is t, the extraction time of the front extraction stage is t1, the extraction time of the middle extraction stage is t2, and the extraction time of the rear extraction stage is t3, wherein t1+t2+t3=t, and t1, t2, and t3 are all greater than t / 5 and less than 2t / 3; the sweet and sour flavor corresponding flow rate constraint conditions include v1>v2>v3, 1ml / s<v1<10ml / s, and 0.1ml / s<v3<3ml / s, the time constraint conditions include t1<t2<t3, 1s<t1<10s, and 5s<t3<20s, and the liquid amount constraint conditions include v1xt1>v2xt2>v3xt3 and v1xt1+v2xt2≥3m / 4; the high-sweet flavor corresponding flow rate constraint conditions include v2>v1≥v3, 1ml / s<v2<10ml / s, and 0.1ml / s<v3<3ml / s, the time constraint conditions include t2<t1<t3, 1s<t2<10s, and 5s<t3<20s, and the liquid amount constraint conditions include v2xt2>v1xt1>v3xt3 and v2xt2≥m / 2; the sweet-bitter flavor corresponding flow rate constraint conditions include v2≥v3>v1, 1ml / s<v2<10ml / s, and 0.1ml / s<v1<3ml / s, the time constraint conditions include t2≤t3<t1, 1s<t2<10s, and 5s<t1<20s, and the liquid amount constraint conditions include v2xt2≥v3xt3>v1xt1 and v2xt2+v3xt3≥3m / 4; and the bitter flavor corresponding flow rate constraint conditions include v3>v2≥v1, 1ml / s<v3<10ml / s, and 0.1ml / s<v1<3ml / s, the time constraint conditions include t3<t2≤t1, 1s<t3<10s, and 5s<t1<20s, and the liquid amount constraint conditions include v3xt3>v2xt2>v1xt1 and v3xt3≥m / 2.

[0018] The present application can determine the overall flavor tone of coffee within the constraint conditions under different flavor types, and provide conditions for the selection of flavor levels, so as to more accurately meet the individual preferences of users.

[0019] In a second aspect, the present application provides an extraction device for coffee, the device comprising: a flavor determining module configured to obtain a user-selected flavor preference, the flavor preference comprising: a flavor type and a flavor level; a parameter determining module configured to determine a constraint condition of an extraction process according to the flavor type, and determine an extraction parameter corresponding to each extraction stage in the extraction process according to the constraint condition and the flavor level, the extraction parameter comprising an extraction flow rate; and an extraction control module configured to perform extraction at the corresponding extraction flow rate in each extraction stage after the coffee making enters the extraction process, so as to obtain coffee meeting the flavor preference.

[0020] In a third aspect, the present application provides a coffee extraction device, comprising: a controller; the controller comprising: a memory and a processor, the memory and the processor being communicatively connected with each other, the memory storing computer instructions, and the processor executing the computer instructions so as to perform the coffee extraction method of the first aspect or any of the corresponding embodiments thereof.

[0021] In an optional embodiment, the coffee extraction device is a coffee machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0023] Figure 1 is a flowchart of the coffee extraction method according to an embodiment of the present application; Figure 2 is a flowchart of another coffee extraction method according to an embodiment of the present application; Figure 3 is a flowchart of still another coffee extraction method according to an embodiment of the present application; Figure 4 is a structural block diagram of the coffee extraction device according to an embodiment of the present application; Figure 5 is a hardware structure diagram of the controller in the coffee extraction device according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0025] The present application is applicable to the scenario where a user makes coffee by using a fully-automatic coffee machine. The embodiments of the present application provide a coffee extraction method, which controls the flow rate in stages during the extraction process to achieve the effect of making coffee that precisely meets the user's flavor preference.

[0026] According to the embodiments of the present application, a coffee extraction method embodiment is provided. It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0027] In the present embodiment, a coffee extraction method is provided, which can be used in the coffee machine described above, Figure 1 is a flowchart of the coffee extraction method according to the embodiments of the present application, as Figure 1 shown, the flow includes the following steps: Step S101, obtaining the user's selected flavor preference, the flavor preference including: flavor type and flavor level.

[0028] Specifically, in the embodiments of the present application, in order to make coffee that meets the user's individualized flavor preference, various flavor preferences are directly displayed on the operation interface of the coffee machine, for example, the flavor preference directly reflecting the user's "sour, sweet, bitter" taste, and "sour, sweet, bitter" are the three core tastes that constitute the flavor skeleton of coffee, the proportion, intensity and coordination of the three directly determine the taste keynote (such as refreshing, mellow, balanced or stimulating) of a cup of coffee. The user can select the expected flavor preference through the operation interface, and the coffee machine obtains the user's selected flavor preference and controls the coffee making process based on the same.

[0029] Step S102, determining the constraint condition of the extraction process according to the flavor type, and determining the extraction parameters corresponding to different extraction stages in the extraction process according to the constraint condition and the flavor level, the extraction parameters including the extraction flow rate.

[0030] Specifically, in the embodiments of the present application, the coffee has different flavor bias during the extraction process with the extraction time, more sour in the early extraction, more sweet in the middle extraction, and mainly bitter in the late extraction. Therefore, the extraction process is divided into the early extraction, the middle extraction and the late extraction, and the extraction flow rate corresponding to different extraction stages is adjusted. Among them, the early extraction, the middle extraction and the late extraction correspond to different time periods in the extraction process, that is, after the extraction starts, the early extraction is entered first, and the extraction is carried out according to the extraction flow rate corresponding to the early extraction, and after the extraction time corresponding to the early extraction is reached, the middle extraction is entered, and then the extraction is carried out according to the extraction flow rate corresponding to the middle extraction, and after the extraction time corresponding to the middle extraction is reached, the late extraction is entered, and then the extraction is carried out according to the extraction flow rate corresponding to the late extraction, which is equivalent to overall control of the extraction process, so as to extract coffee with different liquid amounts and different flavor biases in different extraction stages, for example, more sour, more sweet or more bitter, and finally achieve the effect of adjusting the overall flavor of the coffee. Further, through experimental testing, real person testing and the like, the overall flavor bias of the coffee made under various extraction processes is determined, that is, the corresponding relationship between the overall flavor bias and the extraction flow rate corresponding to the extraction stage is determined.

[0031] In some optional embodiments, during the use of the coffee machine, the user-selected flavor preference is taken as the target flavor bias of the coffee made by the coffee machine, and the corresponding extraction flow rate of different stages in the extraction process is determined according to the corresponding relationship between the overall flavor bias and the extraction flow rate corresponding to the extraction stage.

[0032] Step S103, when the coffee making enters the extraction process, the extraction is carried out according to the corresponding extraction flow rate in different extraction stages, so as to obtain coffee meeting the flavor preference.

[0033] Specifically, in the embodiments of the present application, after the user fills the powder, presses the powder, installs the handle, selects the flavor preference and presses the extraction key, the coffee machine determines the corresponding extraction flow rate of different extraction stages in the extraction process according to the user-selected flavor preference, and then starts to make coffee. The coffee making process includes a pre-soaking process and an extraction process, wherein the pre-soaking process is a pre-treatment process of wetting the coffee powder with a small amount of hot water (or water mist) at low pressure before the extraction formally starts; after the pre-soaking is completed, the extraction process uses hot water with a set extraction pressure and temperature to continuously penetrate the coffee powder cake, which is the main process of extracting flavoring substances.

[0034] In some optional embodiments, the coffee extraction method according to the embodiments of the present application can be used to control the extraction flow rate in different extraction stages according to the user's selected flavor preference, so as to obtain coffee with the flavor preference. The embodiments of the present application can control the extraction flow rate in different extraction stages according to the user's selected flavor preference, so as to optimize the extraction ratio of soluble substances in different extraction stages and achieve precise control of the flavor, thereby improving the flavor performance of the coffee and enhancing the user experience and satisfaction.

[0035] The coffee extraction method according to the embodiments of the present application can be used to control the extraction flow rate in different extraction stages according to the user's selected flavor preference, so as to obtain coffee with the flavor preference. The embodiments of the present application can control the extraction flow rate in different extraction stages according to the user's selected flavor preference, so as to optimize the extraction ratio of soluble substances in different extraction stages and achieve precise control of the flavor, thereby improving the flavor performance of the coffee and enhancing the user experience and satisfaction.

[0036] In the embodiments of the present application, a coffee extraction method is provided, which can be used in the coffee machine described above. Figure 2 The flow chart of the coffee extraction method according to the embodiments of the present application is shown in FIG. 1, which includes the following steps: Figure 2 The flow chart of the coffee extraction method according to the embodiments of the present application is shown in FIG. 1, which includes the following steps: In step S201, the user's selected flavor preference is obtained, which includes the flavor type and the flavor level.

[0037] Specifically, step S201 includes the following steps: In step S2011, the user's selected flavor type is obtained, which is any one of the sweet and sour flavor, the high sweet flavor, the sweet and bitter flavor, and the bitter flavor.

[0038] Specifically, in the embodiments of the present application, the operation interface of the coffee machine provides the user with the options of the sweet and sour flavor, the high sweet flavor, the sweet and bitter flavor, and the bitter flavor, and each flavor type can be set with a corresponding flavor level. Before making coffee, the user selects the flavor type according to personal preference, and the coffee machine obtains the user's selected flavor type.

[0039] In some optional embodiments, the extraction flow rate and extraction time of the extraction stage corresponding to the four flavor types are limited according to the extraction process, that is, the front stage is more sour, the middle stage is more sweet, and the tail stage is mainly bitter. Among them, the extraction flow rate corresponding to the extraction front stage, the extraction middle stage and the extraction rear stage in the extraction process corresponding to the sour and sweet flavor decreases in turn, and the corresponding extraction time increases in turn; the extraction flow rate corresponding to the extraction middle stage, the extraction front stage and the extraction rear stage in the extraction process corresponding to the high sweet flavor decreases in turn, and the corresponding extraction time increases in turn; the extraction flow rate corresponding to the extraction middle stage, the extraction rear stage and the extraction front stage in the extraction process corresponding to the sweet and bitter flavor decreases in turn, and the corresponding extraction time increases in turn; the extraction flow rate corresponding to the extraction rear stage, the extraction middle stage and the extraction front stage in the extraction process corresponding to the bitter flavor decreases in turn, and the corresponding extraction time increases in turn.

[0040] Step S2012, determine the flavor grade corresponding to the flavor type.

[0041] Specifically, in the embodiments of the present application, in order to further accurately meet the individual needs of the user, the user can set the flavor grade of the selected flavor type on the operation interface after selecting the flavor type, for example, selecting in the pre-set 1-10 levels. The coffee machine detects whether the user sets the flavor grade after obtaining the user's selected flavor type, and if the user sets the flavor grade, the coffee machine obtains the user's selected flavor grade, and if the user does not set the flavor grade, the coffee machine confirms according to the default level, for example, taking 5 levels as the default flavor grade. Under different flavor grades of the same flavor type, the size relationship between the extraction flow rates or extraction times corresponding to the different extraction stages remains unchanged, but the size of the extraction flow rate or extraction time can be further adjusted under the constraint of the size relationship to realize the grade adjustment of the flavor type.

[0042] Step S202, determine the constraint condition of the extraction process according to the flavor type, and determine the extraction parameters corresponding to different extraction stages in the extraction process according to the constraint condition and the flavor grade, the extraction parameters including the extraction flow rate.

[0043] Specifically, the above step S202 includes: Step S2021, obtain the pre-set coffee liquid amount, the total time corresponding to the extraction process and the average flow rate.

[0044] Specifically, in the embodiments of the present application, different coffee types correspond to different amounts of coffee liquid, and the extraction process corresponds to different total times and average flow rates. Taking a fully automatic espresso machine as an example, the amount of coffee liquid m for extraction of an espresso is usually 20-60 ml, the total time t (coffee liquid discharge time) of the extraction process is 5-50 s, and the average flow rate v is 0.5-4 ml / s. Different coffee machines have different default settings for the above parameters, and users can also adjust the above parameters according to their needs. In addition, the total time of extraction can also be adjusted according to the flavor preference, wherein the total time of the sweet and sour flavor < the total time of the high sweet flavor < the total time of the sweet bitter flavor < the total time of the bitter flavor, but the amount of coffee liquid m / total time t=average flow rate v is always maintained.

[0045] Step S2022, determining the constraint condition of the extraction process according to the flavor type, and determining the extraction flow rate and extraction time corresponding to different extraction stages according to the amount of coffee liquid, total time, average flow rate and constraint condition.

[0046] Specifically, in the embodiments of the present application, after determining the amount of coffee liquid m, total time t and average flow rate v, the extraction process is refined according to the user's selected flavor preference, the extraction flow rate and extraction time corresponding to different extraction stages are determined, and the flow rate is adjusted in different time periods of the extraction process, so that the extraction proportion of soluble substances in different stages of coffee liquid is optimized, and accurate control of the flavors of acid, sweet, bitter, etc. can be achieved, thereby improving the flavor performance of coffee and enhancing the user experience.

[0047] In some optional embodiments, the above step S2022 comprises: Step a1, determining the constraint condition of the extraction process according to the flavor type, the constraint condition being determined in advance according to the amount of coffee liquid, total time, average flow rate and each extraction stage, including: flow rate constraint condition, time constraint condition and liquid amount constraint condition; Step a2, determining the first value range of the extraction flow rate, the second value range of the extraction time and the third value range of the extraction liquid amount corresponding to each extraction stage according to the amount of coffee liquid, total time, average flow rate and constraint condition.

[0048] Step a3, determining the extraction liquid amount corresponding to each extraction stage in the third value range according to the flavor level.

[0049] Step a4, determining the extraction flow rate in the first value range based on the extraction liquid amount, and determining the extraction time in the second value range.

[0050] Specifically, in the embodiments of the present application, when the user selects the sour-sweet flavor, a higher flow rate is adopted in the pre-extraction section and the middle extraction section, and a lower flow rate is adopted in the post-extraction section; when the user selects the high-sweet flavor, a lower flow rate is adopted in the pre-extraction section and the post-extraction section, and a higher flow rate is adopted in the middle extraction section; when the user selects the sweet-bitter flavor, a lower flow rate is adopted in the pre-extraction section, and a higher flow rate is adopted in the middle extraction section and the post-extraction section; and when the user selects the bitter flavor, a lower flow rate is adopted in the pre-extraction section and the middle extraction section, and a higher flow rate is adopted in the post-extraction section. In order to accurately control the extraction stage, different constraint conditions are set under different flavor types, including flow rate constraint condition, time constraint condition and liquid volume constraint condition, and then the constraint condition to be referred to is determined according to the flavor type selected by the user. Under different constraint conditions, the value range of the extraction flow rate, the extraction time and the extraction liquid volume corresponding to each extraction stage can be determined according to the coffee liquid volume, the total time and the average flow rate, and then the value range of the extraction liquid volume is divided according to the level, and the specific extraction liquid volume of each extraction stage is determined in the value range according to the flavor level set by the user. The extraction liquid volume is the product of the extraction flow rate and the extraction time, and when the extraction liquid volume is determined, the extraction flow rate and the extraction time of each extraction stage are further determined in the value range of the extraction flow rate and the extraction time.

[0051] In some optional embodiments, the extraction flow rates corresponding to the pre-extraction section, the middle extraction section and the post-extraction section are v1, v2 and v3 respectively, the extraction times are t1, t2 and t3 respectively, and the extraction liquid volumes are m1, m2 and m3 respectively, m1=v1×t1, m2=v2×t2, m3=v3×t3. Among them, (v1+v2+v3) / 3=v, t1+t2+t3=t, m1+m2+m3=m, t1, t2, t3 are all greater than t / 5 and less than 2t / 3, v1, v2, v3 are all greater than v / 5 and less than 3×v.

[0052] In some optional embodiments, if the user selects a sour and sweet flavor, a higher flow rate is used in the pre-extraction section and the middle extraction section to extract more sour and sweet flavor substances, and a lower flow rate is used in the post-extraction section to reduce bitterness. Correspondingly, the flow rate constraint conditions corresponding to the entire extraction process are v1>v2>v3, 1 ml / s<v1<10 ml / s, 0.1 ml / s<v3<3 ml / s, the time constraint conditions are t1<t2<t3, 1 s<t1<10 s, 5 s<t3<20 s, and the liquid amount constraint condition during the extraction process is m1>m2>m3, m1+m2≥3m / 4. The extraction parameters determined based on the above constraint conditions can ensure that more coffee is extracted in the pre-extraction section with less time, and the sour and sweet flavors of the coffee are improved. However, based on the constraint conditions, only the value range of each extraction parameter can be determined, so the value range of the extraction liquid amount is divided into levels, and then the specific value of the extraction liquid amount is determined in the value range according to the sour and sweet flavor level selected by the user, such as 1-10 levels. The higher the level, the larger m1 and m2 are, and the larger v1 and v2 are and the smaller t1 and t2 are. In actual operation, after the extraction liquid amount is determined, one parameter is determined based on the value range of the extraction flow rate or the extraction time, and the other parameter is determined.

[0053] In some optional embodiments, if the user selects a high sweet flavor, a lower flow rate is used in the pre-extraction section and the post-extraction section, and a higher flow rate is used in the middle extraction section to increase the extraction of sweet substances. The flow rate constraint conditions corresponding to the entire extraction process are v2>v1>v3, 1 ml / s<v2<10 ml / s, 0.1 ml / s<v3<3 ml / s, the time constraint conditions are t2<t1<t3, 1 s<t2<10 s, 5 s<t3<20 s, and the liquid amount constraint condition during the extraction process is m2>m1>m3, m2≥m / 2. The extraction parameters determined based on the above constraint conditions can ensure that more coffee is extracted in the middle section with less time, and the sweetness of the coffee is improved. However, based on the constraint conditions, only the value range of each extraction parameter can be determined, so the value range of the extraction liquid amount is divided into levels, and then the specific value of the extraction liquid amount is determined in the value range according to the sweet and bitter flavor level selected by the user, such as 1-10 levels. The higher the level, the larger m2 is, and the larger v2 is and the smaller t2 is.

[0054] In some optional embodiments, if the user selects a sweet and bitter flavor, a lower flow rate is used in the pre-extraction section to reduce sour substances, and a higher flow rate is used in the middle and post-extraction sections to improve the sweet and bitter flavor. Correspondingly, the flow rate constraint conditions of the entire extraction process are v2>v3>v1, 1 ml / s<v2<10 ml / s, 0.1 ml / s<v1<3 ml / s, the time constraint conditions are t2<t3<t1, 1 s<t2<10 s, 5 s<t1<20 s, and the liquid amount constraint conditions during the extraction process are m2>m3>m1, m2+m3>3m / 4. Based on the extraction parameters determined based on the above constraint conditions, more coffee can be extracted in the middle extraction section with less time, the extraction amount of the back end is increased and the extraction amount of the front end is reduced, and the sweet and bitter flavor of the coffee is improved. However, based on the constraint conditions, only the value range of each extraction parameter can be determined, so the value range of the extraction liquid amount is divided into levels, and then the specific value of the extraction liquid amount is determined in the value range according to the sweet and bitter flavor level selected by the user, such as 1-10 levels. The higher the level, the larger m2 and m3 are, and the larger v2 and v3 are and the smaller t2 and t3 are.

[0055] In some optional embodiments, if the user selects a bitter flavor, a lower flow rate is used in the pre-extraction section and the middle extraction section, and a higher flow rate is used in the post-extraction section to highlight the bitter taste of the coffee. The flow rate constraint conditions of the entire extraction process are v3>v2>v1, 1 ml / s<v3<10 ml / s, 0.1 ml / s<v1<3 ml / s, the time constraint conditions are t3<t2<t1, 1 s<t3<10 s, 5 s<t1<20 s, and the liquid amount constraint conditions during the extraction process are m3>m2>m1, m3>m / 2. Based on the extraction parameters determined based on the above constraint conditions, more coffee can be extracted in the middle extraction section with less time, the extraction amount of the back end is increased and the extraction amount of the front end is reduced, and the sweet and bitter flavor of the coffee is improved. However, based on the constraint conditions, only the value range of each extraction parameter can be determined, so the value range of the extraction liquid amount is divided into levels, and then the specific value of the extraction liquid amount is determined in the value range according to the sweet and bitter flavor level selected by the user, such as 1-10 levels. The higher the level, the larger m3 is, and the larger v3 is and the smaller t3 is.

[0056] Step S203, when the coffee making enters the extraction process, extraction is performed at different extraction stages according to the corresponding extraction flow rate to obtain coffee that meets the flavor preference. For details, please refer to Figure 1 Step S103 of the embodiment shown in the figure will not be described here again.

[0057] The coffee extraction method provided by this invention determines the extraction flow rate corresponding to each extraction stage based on the user's selected flavor preference. During coffee making, extraction is performed at different stages according to the corresponding extraction flow rate to obtain coffee that meets the flavor preference. This invention optimizes the extraction ratio of soluble substances in the coffee liquid at different extraction stages by controlling the flow rate in stages based on the user's flavor preference, achieving precise control of flavor and improving the technical effect of enhancing coffee flavor expression, user experience, and satisfaction.

[0058] This embodiment provides a coffee extraction method that can be used in the aforementioned coffee machine. Figure 3 This is a flowchart of a coffee extraction method according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps: Step S301: Obtain the flavor preference selected by the user. Flavor preference includes flavor type and flavor level. For details, please refer to [link to relevant documentation]. Figure 2 Step S201 of the illustrated embodiment will not be described again here.

[0059] Step S302: Determine the constraints of the extraction process based on the flavor type, and determine the extraction parameters corresponding to different extraction stages based on the constraints and flavor level. The extraction parameters include the extraction flow rate. For details, please refer to [link to details]. Figure 2 Step S202 of the illustrated embodiment will not be described again here.

[0060] Step S303: After the coffee making process enters the extraction process, extraction is carried out at different extraction stages according to the corresponding extraction flow rate to obtain coffee that meets the flavor preference.

[0061] Specifically, step S303 includes: Step S3031: After the extraction process begins, the pre-extraction stage is taken as the current extraction stage, and the flow rate is adjusted according to the extraction flow rate corresponding to the current extraction stage.

[0062] Specifically, in this embodiment of the invention, the coffee extraction process is divided into different extraction stages. Depending on the flavor preference selected by the user, the extraction time and extraction flow rate are different for different extraction stages in the same extraction process. Furthermore, the same extraction stage corresponding to different extraction processes will also vary due to different flavor preferences, thereby meeting the personalized needs of different users.

[0063] In some optional implementations, the coffee machine begins brewing coffee after determining the extraction volume, flow rate, and extraction time for each extraction stage based on the user-selected flavor type and level. Once the extraction process begins, the initial extraction stage is designated as the current extraction stage, and the extraction flow rate and extraction time for this stage are obtained. During the extraction process, the extraction flow rate is adjusted to achieve the flow rate determined in the initial extraction stage.

[0064] Step S3032: Obtain the extraction duration and determine whether the duration has reached the extraction time corresponding to the current extraction stage.

[0065] Specifically, in this embodiment of the invention, after the extraction pre-stage begins, the extraction duration is accumulated, and it is determined whether the extraction duration has reached the extraction time corresponding to the extraction pre-stage. If not, extraction continues at the current extraction flow rate.

[0066] In step S3033, if the target is reached, the next extraction stage is taken as the current extraction stage, and the process returns to the step of adjusting the flow rate according to the extraction flow rate corresponding to the current extraction stage, until the extraction process ends.

[0067] Specifically, in this embodiment of the invention, when the extraction duration reaches the extraction time corresponding to the initial extraction stage, the corresponding amount of extractant from the initial extraction stage can be extracted. The middle extraction stage is then designated as the current extraction stage, and the extraction flow rate is adjusted to achieve the extraction flow rate determined for the middle extraction stage. Simultaneously, the extraction duration is re-accumulated to determine if it has reached the extraction time corresponding to the middle extraction stage, or if accumulation continues on the previous extraction duration, but the time difference between the current extraction duration and the extraction duration at the end of the initial extraction stage is calculated, and it is determined whether the time difference reaches the extraction time corresponding to the middle extraction stage. If not, extraction continues at the current extraction flow rate.

[0068] In some optional implementations, if the extraction time is reached, the extraction volume corresponding to the middle stage can be extracted. The later stage of extraction is then taken as the current extraction stage, and the extraction flow rate is adjusted to achieve the extraction flow rate determined for the later stage. The extraction duration is accumulated until it reaches the extraction time corresponding to the later stage, at which point the extraction process ends. At this point, the total extraction duration for each extraction stage is a predetermined total time, the total extraction volume for each extraction stage is a predetermined coffee volume, and the average extraction flow rate for each extraction stage is a predetermined average flow rate.

[0069] In some alternative embodiments, the coffee machine can make coffee according to the user's flavor preference by controlling the extraction flow rate and the extraction time, and can also make coffee according to the user's flavor preference by controlling the extraction liquid volume and the extraction flow rate, i.e., extracting according to the corresponding extraction flow rate in different extraction stages, controlling the coffee liquid flow, and determining whether the extraction liquid volume of the current extraction stage is reached. For example, the user wants to extract 30 ml of coffee with a sour and sweet flavor, and there are two control methods: (1) generate control instructions of extraction time and extraction flow rate, the first stage extraction is 5 s, the flow rate is 3 ml / s; the second stage extraction is 5 s, the flow rate is 2 ml / s; the third stage extraction is 10 s, the flow rate is 0.5 ml / s, and a total of 30 ml of coffee is extracted. (2) Generate control instructions of liquid flow and extraction flow rate, the first stage extraction is 15 ml, the flow rate is 3 ml / s; the second stage extraction is 10 ml, the flow rate is 2 ml / s; the third stage extraction is 5 ml, the flow rate is 0.5 ml / s, and a total of 30 ml of coffee is extracted, and the actual extraction time is 5 s for the first stage extraction, 5 s for the second stage extraction, and 10 s for the third stage extraction.

[0070] In some alternative embodiments, the embodiment of the present application conducts sensory tests on 57 people who often drink coffee, selects deeply roasted coffee beans, and makes five different flavors of espresso based on the above coffee extraction process. Among them, each cup of extracted concentrate is 30 ml, and 120 ml of hot water is added for dilution (because the flavor intensity of the concentrate is too high to affect the sensory test), and then divided into five equal parts, each part is 30 ml. 57 test personnel, a total of 12 times of coffee liquid extraction for each extraction logic. The extraction flow rate and extraction time of the five different flavors of espresso are as follows: The first kind: 30 ml of concentrate, v1=v2=v3=1 ml / s, t1=t2=t3=10 s; The second kind: 30 ml of concentrate, v1=1.5 ml / s, t1=8 s, v2=1.5 ml / s, t2=8 s, v3=0.5 ml / s, t3=12 s; The third kind: 30 ml of concentrate, v1=0.5 ml / s, t1=14 s, v2=2 ml / s, t2=8 s, v3=0.5 ml / s, t3=14 s; The fourth kind: 30 ml of concentrate, v1=0.5 ml / s, t1=14 s, v2=1.5 ml / s, t2=8 s, v3=1 ml / s, t3=11 s; The fifth kind: 30 ml of concentrate, v1=0.5 ml / s, t1=12 s, v2=0.8 ml / s, t2=10 s, v3=2 ml / s, t3=8 s.

[0071] Each person can choose at most two items from the three options of sour, bitter, and sweet. The experimental results are shown in the following table:

[0072] It can be seen that, due to the deep-roasted coffee, the coffee is bitter and the sweetness is low at the same flow rate during the whole extraction process; when the flow rate of the middle stage is increased, the sour taste and the sweetness are obviously improved; when the flow rate of the middle stage is increased and the flow rates of the front stage and the rear stage are reduced, the sweetness is more obviously improved; when the flow rate of the front stage is reduced and the flow rate of the middle stage is increased, the sweetness is retained while the bitterness is further increased; and when the flow rates of the front stage and the middle stage are reduced and the flow rate of the rear stage is increased, the bitterness is obviously increased. Therefore, the embodiment of the present application can make coffee with different flavors by adjusting the flow rate in stages during the extraction process, improve the flavor performance of the coffee, and meet the individualized needs of users.

[0073] The coffee extraction method provided by the present application determines the extraction flow rate corresponding to each extraction stage in the extraction process according to the flavor preference selected by the user, extracts at the corresponding extraction flow rate in different extraction stages during the coffee making process, and obtains coffee that meets the flavor preference. The present application controls the flow rate of the extraction process in stages based on the flavor preference of the user, optimizes the extraction ratio of soluble substances of the coffee liquid in different extraction stages, realizes accurate control of the flavor, and achieves the technical effects of improving the flavor performance of the coffee and enhancing the user experience and satisfaction.

[0074] In the embodiment, a coffee extraction device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, implementation of hardware or a combination of software and hardware is also possible and contemplated.

[0075] The present embodiment provides a coffee extraction device, as shown in Figure 4 The device comprises: A flavor determination module 401 is configured to obtain the flavor preference selected by the user, and the flavor preference comprises a flavor type and a flavor level.

[0076] A parameter determination module 402 is configured to determine the constraint condition of the extraction process according to the flavor type, and determine the extraction parameter corresponding to different extraction stages in the extraction process according to the constraint condition and the flavor level, wherein the extraction parameter comprises an extraction flow rate.

[0077] An extraction control module 403 is configured to extract at the corresponding extraction flow rate in different extraction stages when the coffee making enters the extraction process, so as to obtain coffee that meets the flavor preference.

[0078] In some optional embodiments, the parameter determination module 402 comprises: The parameter acquisition unit is configured to acquire a preset coffee liquid amount, a total time corresponding to an extraction process, and an average flow rate.

[0079] The parameter calculation unit is configured to determine an extraction flow rate and an extraction time corresponding to different extraction stages according to the flavor preference, the coffee liquid amount, the total time, and the average flow rate.

[0080] In some optional embodiments, the parameter calculation unit comprises: The condition determination subunit is configured to determine a constraint condition of the extraction process according to the flavor type, the constraint condition being determined in advance according to the coffee liquid amount, the total time, the average flow rate, and the respective extraction stages, and comprising a flow rate constraint condition, a time constraint condition, and a liquid amount constraint condition.

[0081] The range determination subunit is configured to determine a first value range of an extraction flow rate, a second value range of an extraction time, and a third value range of an extraction liquid amount corresponding to the respective extraction stages according to the coffee liquid amount, the total time, the average flow rate, and the constraint condition.

[0082] The parameter determination subunit is configured to determine the extraction liquid amount corresponding to the respective extraction stages within the third value range according to the flavor grade, determine the extraction flow rate in the first value range based on the extraction liquid amount, and determine the extraction time in the second value range.

[0083] In some optional embodiments, the extraction control module 403 comprises: The stage control unit is configured to, after the extraction process starts, take a pre-extraction stage as a current extraction stage, and perform flow rate adjustment according to an extraction flow rate corresponding to the current extraction stage.

[0084] The time judgment unit is configured to acquire an extraction duration, and judge whether the duration reaches an extraction time corresponding to the current extraction stage.

[0085] The stage adjustment unit is configured to, if the duration reaches the extraction time, take a next extraction stage as the current extraction stage, and return to the step of performing flow rate adjustment according to the extraction flow rate corresponding to the current extraction stage, until the extraction process ends.

[0086] In some optional embodiments, the flavor determination module 401 comprises: The flavor type acquisition unit is configured to acquire a flavor type selected by a user, the flavor type being any one of a sour-sweet flavor, a high-sweet flavor, a sweet-bitter flavor, and a bitter-more flavor.

[0087] The flavor grade determination unit is configured to determine a flavor grade corresponding to the flavor type.

[0088] Further function descriptions of the above respective modules and units are the same as those of the above corresponding embodiments, and will not be described herein again.

[0089] In this embodiment, the coffee extraction device is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0090] This invention also provides a coffee extraction device, such as a coffee machine or other equipment capable of making coffee, the coffee extraction device having the above-described features. Figure 4 The coffee extraction device shown.

[0091] Please see Figure 5 , Figure 5 This is a schematic diagram of the controller in a coffee extraction device provided by an optional embodiment of the present invention, as shown below. Figure 5 As shown, the controller includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions that execute within the computer device, including instructions stored in or on memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 5 Take a processor 10 as an example.

[0092] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GPA), or any combination thereof.

[0093] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0094] The memory 20 can include a program storage area and a data storage area, where the program storage area can store an operating system, application programs required for at least one function, and the data storage area can store data created according to the use of the computer device, etc. In addition, the memory 20 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some alternative embodiments, the memory 20 can optionally include a memory disposed remotely from the processor 10, which can be connected to the computer device through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0095] The memory 20 can include a volatile memory, such as a random access memory, and can also include a non-volatile memory, such as a flash memory, a hard disk, or a solid state disk, and can also include a combination of the above-mentioned kinds of memories.

[0096] The computer device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30, and the output device 40 can be connected through a bus or other means, Figure 5 The connection through the bus is taken as an example.

[0097] The input device 30 can receive inputted digital or character information, and generate key signal inputs related to the user settings and function controls of the computer device, such as a touch screen, a keypad, a mouse, a trackpad, a touchpad, a pointing stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 can include a display device, an auxiliary lighting device (e.g., an LED), a tactile feedback device (e.g., a vibration motor), etc. The display device includes, but is not limited to, a liquid crystal display, a light-emitting diode, a display, and a plasma display. In some alternative embodiments, the display device can be a touch screen.

[0098] The embodiments of the present application further provide a computer readable storage medium, and the method according to the embodiments of the present application can be implemented in hardware, firmware, or recorded in a storage medium, or stored in a remote storage medium or a non-transitory machine readable storage medium and downloaded to a local storage medium through network, so that the method described herein can be processed by such software on a storage medium using a general purpose computer, a special purpose processor, or programmable or special hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid state disk, etc. Further, the storage medium can also include a combination of the above-mentioned memories. It can be understood that the computer, the processor, the microprocessor controller, or the programmable hardware includes a storage component that can store or receive software or computer code, when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above embodiments is implemented.

[0099] Part of the present application can be applied as a computer program product, for example, computer program instructions, when executed by a computer, through the operation of the computer, the method and / or technical solutions according to the present application can be called or provided. Those skilled in the art should understand that the form of computer program instructions in a computer readable medium includes but is not limited to source files, executable files, installation package files, etc. Correspondingly, the way of executing computer program instructions by computer includes but is not limited to: the computer directly executes the instructions, or the computer compiles the instructions and then executes the corresponding compiled program, or the computer reads and executes the instructions, or the computer reads and installs the instructions and then executes the corresponding installed program. Here, the computer readable medium can be any available computer readable storage medium or communication medium accessible to the computer.

[0100] Although the embodiments of the present application are described in conjunction with the accompanying drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A method of extraction of coffee, characterized in that, The method comprises: obtaining a flavor preference selected by a user, the flavor preference comprising a flavor type and a flavor level; determining a constraint condition of an extraction process according to the flavor type, and determining an extraction parameter corresponding to each extraction stage in the extraction process according to the constraint condition and the flavor level, the extraction parameter comprising an extraction flow rate; when the coffee making enters the extraction process, extracting at the corresponding extraction flow rate in different extraction stages to obtain coffee meeting the flavor preference.

2. The method of claim 1, wherein, The extraction parameter further comprises an extraction time, and the determining the constraint condition of the extraction process according to the flavor type, and determining the extraction parameter corresponding to each extraction stage in the extraction process according to the constraint condition and the flavor level comprises: obtaining a preset coffee liquid amount, a total time corresponding to the extraction process and an average flow rate; determining the constraint condition of the extraction process according to the flavor type, and determining the extraction flow rate and the extraction time corresponding to each extraction stage according to the coffee liquid amount, the total time, the average flow rate and the constraint condition.

3. The method of claim 2, wherein, The determining the constraint condition of the extraction process according to the flavor type, and determining the extraction flow rate and the extraction time corresponding to each extraction stage according to the coffee liquid amount, the total time, the average flow rate and the constraint condition comprises: determining the constraint condition of the extraction process according to the flavor type, the constraint condition being determined in advance according to the coffee liquid amount, the total time, the average flow rate and each extraction stage, comprising a flow rate constraint condition, a time constraint condition and a liquid amount constraint condition; determining a first value range of the extraction flow rate, a second value range of the extraction time and a third value range of the extraction liquid amount corresponding to each extraction stage according to the coffee liquid amount, the total time, the average flow rate and the constraint condition; determining the extraction liquid amount corresponding to each extraction stage in the third value range according to the flavor level; determining the extraction flow rate in the first value range based on the extraction liquid amount, and determining the extraction time in the second value range.

4. The method of claim 2, wherein, The extraction process comprises an extraction front stage, an extraction middle stage and an extraction rear stage in sequence, and the extracting at the corresponding extraction flow rate in different extraction stages comprises: after the extraction process starts, taking the extraction front stage as a current extraction stage, and adjusting the flow rate according to the extraction flow rate corresponding to the current extraction stage; obtaining an extraction duration, and determining whether the duration reaches the extraction time corresponding to the current extraction stage; if yes, taking a next extraction stage as the current extraction stage, and returning to the step of adjusting the flow rate according to the extraction flow rate corresponding to the current extraction stage until the extraction process ends.

5. The method according to any one of claims 1 to 3, characterized in that, The obtaining the flavor preference selected by the user comprises: obtaining the flavor type selected by the user, the flavor type being any one of a sour-sweet flavor, a high-sweet flavor, a sweet-bitter flavor and a bitter flavor; determining a flavor level corresponding to the flavor type.

6. The method of claim 5, wherein The corresponding extraction flow rate of the sour-sweet flavor in the extraction process decreases in sequence in the front, middle and rear extraction sections, and the corresponding extraction time increases in sequence; The corresponding extraction flow rate of the high-sweet flavor in the extraction process decreases in sequence in the middle, front and rear extraction sections, and the corresponding extraction time increases in sequence; The corresponding extraction flow rate of the sweet-bitter flavor in the extraction process decreases in sequence in the middle, rear and front extraction sections, and the corresponding extraction time increases in sequence; The corresponding extraction flow rate of the bitter-more flavor in the extraction process decreases in sequence in the rear, middle and front extraction sections, and the corresponding extraction time increases in sequence.

7. The method of claim 6, wherein, The coffee liquid quantity of the extraction stage is m, the average flow rate of the extraction stage is v, the extraction flow rate of the front extraction section is v1, the extraction flow rate of the middle extraction section is v2, and the extraction flow rate of the rear extraction section is v3, wherein (v1+v2+v3) / 3=v, and v1, v2 and v3 are all greater than v / 5 and less than 3×v; the total time of the extraction stage is t, the extraction time of the front extraction section is t1, the extraction time of the middle extraction section is t2, and the extraction time of the rear extraction section is t3, wherein t1+t2+t3=t, and t1, t2 and t3 are all greater than t / 5 and less than 2t / 3; The flow rate constraint condition corresponding to the sour-sweet flavor includes v1>v2>v3, 1ml / s<v1<10ml / s, 0.1ml / s<v3<3ml / s, the time constraint condition includes t1<t2<t3, 1s<t1<10s, 5s<t3<20s, and the liquid quantity constraint condition includes v1×t1>v2×t2>v3×t3, v1×t1+v2×t2≥3m / 4; The flow rate constraint condition corresponding to the high-sweet flavor includes v2>v1>v3, 1ml / s<v2<10ml / s, 0.1ml / s<v3<3ml / s, the time constraint condition includes t2<t1<t3, 1s<t2<10s, 5s<t3<20s, and the liquid quantity constraint condition includes v2×t2>v1×t1>v3×t3, v2×t2≥m / 2; The flow rate constraint condition corresponding to the sweet-bitter flavor includes v2>v3>v1, 1ml / s<v2<10ml / s, 0.1ml / s<v1<3ml / s, the time constraint condition includes t2≤t3<t1, 1s<t2<10s, 5s<t1<20s, and the liquid quantity constraint condition includes v2×t2≥v3×t3>v1×t1, v2×t2+v3×t3≥3m / 4; The flow rate constraint condition corresponding to the bitter-more flavor includes v3>v2>v1, 1ml / s<v3<10ml / s, 0.1ml / s<v1<3ml / s, the time constraint condition includes t3<t2≤t1, 1s<t3<10s, 5s<t1<20s, and the liquid quantity constraint condition includes v3×t3>v2×t2>v1×t1, v3×t3≥m / 2.

8. An apparatus for the extraction of coffee, characterized in that, The device comprises: a flavor determining module configured to obtain a user-selected flavor preference, the flavor preference comprising a flavor type and a flavor level; a parameter determining module configured to determine a constraint condition of an extraction process according to the flavor type, and determine extraction parameters corresponding to different extraction stages in the extraction process according to the constraint condition and the flavor level, the extraction parameters comprising an extraction flow rate; an extraction control module configured to perform extraction at different extraction stages according to the corresponding extraction flow rate when coffee making enters the extraction process, so as to obtain coffee meeting the flavor preference.

9. A coffee extraction apparatus, characterized in that, comprise: a controller; the controller comprises a memory and a processor, the memory and the processor are in communication connection with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the coffee extraction method in any one of claims 1 to 7.

10. The coffee extraction apparatus according to claim 9, characterized in that, The coffee extraction device is a coffee machine.

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