Method for improving uniformity of density of espresso coffee in espresso coffee machine, and related espresso coffee machine

Abstract

To provide a machine for preparing and discharging espresso coffee.SOLUTION: A machine includes: a coffee boiler; a filter holder including a filter for coffee powder pack to be pressed; a pre-injection chamber; and a hydraulic pressure circuit for conveying pressurized water from the coffee boiler to the pre-injection chamber. The machine further includes a device for detecting a parameter indicating loading of the pre-injection chamber and the hydraulic pressure circuit. The machine can start a step of discharging espresso coffee on the basis of a detected loading parameter.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates generally to espresso coffee machines, and more particularly to a method for determining the desired strength of an espresso coffee. The present invention relates to a method and machine capable of dispensing espresso coffee. [Background technology]

[0002] Many machines for preparing beverages are known in the prior art. Many machines are known for preparing espresso coffee from capsules, pods, etc. .

[0003] Machines for preparing espresso coffee usually contain ground coffee. In some known machines, high temperature and pressure water flows through the pack. It is possible to precisely regulate the pressure and / or temperature of the water passing through the coffee pack. In some known machines, the pressure and / or temperature of the water can be changed during dispensing. It is Noh.

[0004] The above-mentioned features allow for more effective extraction of ingredients and essence from ground coffee powder. It has been adopted by some coffee machine manufacturers to improve the quality of the beverage by The above mentioned functions, among others, allow for different coffee mixtures, different processing operations, grinding, etc. Compensating for different particle sizes and degrees of compression in coffee, as well as different moisture percentages It is also used in

[0005] In some cases, coffee machine manufacturers offer coffee with the same characteristics. We are currently working to develop a solution for the preparation of acetaldehyde.

[0006] Currently, there are machines for preparing espresso coffee that dispense beverages at a constant pressure. In this case, the machine will start injecting (espresso coffee) from the moment the user issues the command to start injecting. Begin calculating the amount or mass of water to be used.

[0007] The same can be said for machines with a control unit that allows the operator to select different pressure profiles. In this case, the machine starts reproducing the profile from the moment the operator issues the command. After the specified amount or mass of water has flowed or the total time has elapsed since the start of injection , interrupting profile reproduction.

[0008] Patent Document 1 (International Publication No. 2011 / 140582 pamphlet) describes an espresso coffee machine. An improved method and apparatus for varying pump power is described. A module is operatively associated with the pump for varying the pump output. The module preferably determines the pressure profile for the flow delivered by the pump. In some embodiments, a module for varying the pump output may be provided. The lubricant can be used to obtain pre-infusion. In accordance with one aspect of the subject matter described herein, a module for modifying pump output for pre-infusion is provided. In some embodiments, an espresso coffee machine is provided, comprising: The module for varying the pump power adjusts the pressure during the espresso coffee production cycle. It can be used to define a force profile. The pressure profile can be preset. The pressure profile may be preset or set by the user. can take the form of a power-time profile showing the power delivered to each pump Patent Document 2 (European Patent Application Publication No. 3225141) describes a coffee machine and its construction. The method of operation is described. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] International Publication No. 2011 / 140582 Brochure [Patent Document 2] European Patent Application Publication No. 3225141 Summary of the Invention

[0010] The applicant currently uses a fixed ratio of solvent (water) to solute (coffee powder). We realize that we cannot get the perfect espresso coffee, and the reason is that However, it is not possible to accurately calculate how much water will be dispensed before the pre-injection begins. etc.

[0011] In practice, the amount of coffee powder used may vary and / or may be set by the user. The difference in the fineness of the grinding and / or the pressure applied by the user may cause The volume of the empty space above the coffee powder pack changes. of liquid allocated to fill the empty space above the coffee puck before it reaches the The amount varies.

[0012] That is, a portion of the supplied water is used to fill the water pressure circuit upstream of the filter holder. One part is used to fill the volume of the filter above the coffee powder pack. The volume of the hydraulic circuit is practically known by the manufacturer of the espresso coffee machine. The volume above the coffee powder pack can be calculated based on the information available, but the volume above the coffee powder pack can be calculated based on the information available. Different amounts of flour and / or different grinding fineness set by the user, and / or changes with different pressures applied by the user. This volume is approximately 2.5 cm 3 ~ Approximately 10 cm 3 Such an amount of water will affect the strength of the resulting espresso coffee. For the same amount of water supply, coffee The smaller the upstream volume of the pack, the more solvent is available for espresso coffee. On the other hand, if the volume of the upstream side of the coffee pack is large, it can be used for espresso coffee. The amount of solvent available is less. In other words, for the same amount of water supplied, the coffee pack If less water is used to fill the upstream volume, more water is available for drinking. On the other hand, if more water is used to fill the upstream volume of the coffee pack, the more water is used for the beverage. Less water is used. The strength of espresso coffee actually depends not only on the amount of water, but also on the It also depends on the amount of powder.

[0013] As mentioned above, Patent Document 1 discloses an improved method for an espresso coffee machine. In this case, the espresso coffee machine is pre-infused. A module for changing the pump output is provided to change the pump output. The module defines the pressure profile during the espresso coffee production cycle. According to Patent Document 1, the pressure profile is set in advance. The pressure profile may be set by the user or may be provided to each pump. The power consumption can take the form of a power-time profile showing the power consumed. The pressure profile set is a compromise and does not take into account the actual conditions of the ground coffee packs. Therefore, it is clear that there is room for improvement in the approach described in Patent Document 1. The pre-defined profile may include, for example, at least one of the following: the actual amount of ground coffee in the filter, the amount of ground coffee in the filter The pressure in the circuit, the average particle size of the ground coffee, and the amount of coffee remaining in the circuit compared to the previous cycle Similar considerations apply to user-configurable pressure profiles. This also applies to the amount of ground coffee and water flow in the filter. It is possible that they have some information about the amount of water remaining in the duct, but the information is not completely accurate. Because I don't know for sure.

[0014] Patent Document 2 discloses a coffee machine, in particular a coffee machine having a pouring chamber formed in a pouring cylinder. A method of operating a coffee machine with a built-in coffee grinder is disclosed. In this case, the injection chamber is opened by a piston displaceably arranged in the injection cylinder. The applicant's objective is to control the amount of coffee powder used and / or is relatively independent of the fineness of grinding set by the user and / or the pressure applied by the user. To provide an espresso coffee machine capable of producing espresso coffee of a set concentration. And so.

[0015] According to the invention, a parameter indicating the filling of the upstream empty space in the coffee powder pack is The change in the data value is detected. This filling parameter is used for the subsequent pre-filling step and the actual filling step. That is, according to the present invention, the infusion step is carried out in the extraction step of coffee. It does not start from the moment hot water starts flowing from the boiler, but from the moment the coffee powder pack It starts when the upstream circuit and empty space are filled with water. The water used to fill the jar is not taken into account in calculating the concentration.

[0016] Filling parameters can be pressure change, flow rate change, mass change, or any combination of these parameters. The present invention may include any other combination of

[0017] According to a first aspect of the invention, a machine for preparing and dispensing espresso coffee is provided. The machine is provided with a coffee boiler and a filter for pressing coffee powder packs. a filter holder having a filter, a pre-infusion chamber, and a filter holder for extracting the pre-infusion chamber from a coffee boiler; and a hydraulic circuit for delivering pressurized water to the pre-infusion chamber. and a device for detecting a change in a parameter value indicative of filling of the hydraulic circuit, and dispensing espresso coffee based on the change in the fill parameter value determined by the step of can be started.

[0018] According to some embodiments, parameter values ​​indicative of the filling of the pre-infusion chamber and the hydraulic circuit The device for detecting the slowdown includes a flow meter. The flow meter is configured to detect, for example, a slowdown in the flow of water. The slowing of the water flow indicates the filling of the pre-injection chamber and hydraulic circuit. In fact, the water flow towards the pressed coffee pack is resisted by the water coming into contact with the coffee pack. It is free and virtually unimpeded until resistance occurs, causing the water flow to slow down.

[0019] According to some other embodiments, parameters indicative of the filling of the pre-infusion chamber and the hydraulic circuit are The device for detecting the temperature value includes a pressure transducer. The pressure transducer detects, for example, a pressure difference in water. The water pressure differential indicates the filling of the pre-injection chamber and the hydraulic circuit. As mentioned above, the water flow towards the pressed coffee pack is until it comes into contact with the coffee pack, creating a resistance and a pressure difference between the water will not be hindered by

[0020] According to some other embodiments, parameters indicative of the filling of the pre-infusion chamber and the hydraulic circuit are The device for detecting the value of the expelled espresso may include a metering device. configured to detect a change in weight or mass in a container for receiving the coffee. The weight of the container will not change unless espresso coffee flows into it. When the beverage begins to flow into the container, the water dispensed fills the pre-fill chamber and This means that the water pressure circuit is filled and the coffee pack is moistened. The water dispensed before the coffee reaches the cup is fill water and is not taken into account in the calculation of the extraction ratio. It may not be taken into consideration.

[0021] According to another aspect of the present invention, an espresso machine is used to prepare espresso coffee. A method for producing a coffee brewer is provided, the method comprising: a coffee boiler; and a pressed coffee powder. A filter holder with a filter for the pack, a pre-infusion chamber and a coffee boiler and a hydraulic circuit for delivering pressurized water from the pre-infusion chamber to the pre-infusion chamber. detecting a change in a parameter value indicative of filling of the pre-infusion chamber and the hydraulic circuit; dispensing espresso coffee based on the changes in the fill parameter values ​​obtained; Includes:

[0022] The filling parameters include a parameter indicating the water flow, a parameter indicating the water pressure, and a parameter indicating the amount of water discharged into the container. At least one of the parameters indicating the weight or mass of the espresso coffee is changed. It can include the formation of

[0023] Changes in fill parameter values ​​may include slowing of water flow, or pressure differential, or changes in weight or mass. It can be done.

[0024] The present invention will now be described in detail by way of example with reference to the accompanying drawings. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a perspective view showing an example of an espresso coffee machine to which the present invention can be applied; [Figure 2] 1 is an explanatory diagram showing a first embodiment of a water pressure circuit in an espresso coffee machine according to the present invention; [Figure 3] FIG. 4 is an explanatory diagram showing a second embodiment of a water pressure circuit in an espresso coffee machine according to the present invention. [Figure 4] FIG. 1 is a cross-sectional view of the coffee boiler and the filter holder without water. [Figure 5] FIG. 5 is an illustration of the same components as in FIG. 4, but with a first amount of water in the circuit leading to the coffee powder pack. [Figure 6] FIG. 5 is an illustration of the same components as in FIG. 4, but with water completely filling the circuitry and all space above the coffee pack. [Figure 7]1 is a flow chart showing three different flows for three variants of the method according to the invention; [Figure 8] 1 is a flow chart showing three different flows for three variants of the method according to the invention; [Figure 9] 1 is a flow chart showing three different flows for three variants of the method according to the invention; [Figure 10] FIG. 2 is an explanatory diagram showing the connection between the detection device and the processing device. DETAILED DESCRIPTION OF THE INVENTION

[0026] FIG. 1 shows an exemplary espresso coffee machine, generally designated by the reference numeral 1000. The machine 1000 comprises a substantially closed machine body 1001 that houses the main components, Some of these are described below: The machine 1000 preferably has a surface on which a cup can be placed. On the surface 1002, an electrical resistance system (not shown) or other heating system is provided. You can also provide a system.

[0027] The machine 1000 comprises at least one dispenser group for dispensing espresso coffee. 1003. The machine 1000, like the machine illustrated in FIG. 1003, it is preferable to have, for example, three groups. In this case, two, four or Preferably, the top is divided by a grid 1005. A properly closed drip tray 1004 is preferably located below the dispensing group 1003. The coffee cup typically rests on the grid 1005 during the dispensing of the espresso coffee. will be placed in.

[0028] The filter holder for supporting the filter for the coffee powder pack is provided in each dispensing group. 1003.

[0029] The machine 1000 may be configured with a button, for example, to turn the machine on / off and / or to start dispensing. The device may include one or more displays 1010 and push buttons for starting or ending the device. Cut.

[0030] The machine 1000 shown in FIG. 1 comprises a number of dispenses of espresso coffee for each dispense group 1003. to start or stop the process and / or change the pressure during the delivery of espresso coffee It also has a lever 1112 for

[0031] Before describing the hydraulic circuit diagrams of FIGS. 2 and 3 in detail, it will be noted that the reference numerals used are are described below along with a brief description of the components.

[0032] 1 Coffee Boiler 10 Pump 11 Expansion valve 12 Check valve 13 Preheater mixing valve 14 Steam boiler 15 Pressure reducing valve 16 Flow meter (volume meter) 18 Ball Tap 19 Steam solenoid valve 20 Steam Wand 21 Hot water mixing valve 22 Steam boiler charging solenoid valve 23 Hot Water Wand 24 Pressure transducer 25 Steam boiler pressure gauge 26 Drainage well 27 Gear Pump 28 Safety valve 29 Weighing System

[0033] In Figures 2 and 3, the following symbols are used: The hot water flow is represented by a solid line and the steam flow is represented by a dashed line. and the discharge flow is represented by a "long dash-short double dash-long dash" line. are.

[0034] Briefly, in the exemplary embodiment shown in FIG. 2, a water main (or other Cold water (from any source) is fed to a pump 10. The pump 10 pumps the water into a steam boiler 14. , preferably through a check valve 12 and a preheater mixing valve 13 .

[0035] The steam wand 20 is connected to the steam boiler 14 to emit steam, for example, for cappuccino. The milk is frothed to make the sauce.

[0036] The steam boiler 14 is used to provide hot water for preparing infusions (e.g., tea or tisane). For this purpose, the hot water wand 23 is in fluid communication with the hot water wand 23.

[0037] As shown in FIG. 4, water from the coffee boiler 1 is fed into the injection solenoid valve 9 and the injection water pipe 6. In particular, the water from the pipe 6 is preferably conveyed to the shower group 1003. The particles reach the screen 4 and are then transported into the filter 7 supported by the filter holder 8. The water is distributed substantially uniformly above the contained coffee powder pack. , the grinding force that the bartender presses before engaging the filter holder 8 with the bottom of the group 1003. Including coffee.

[0038] The injection solenoid valve 9 is preferably a three-way valve. a first path for drawing out the water, a second path connected to the injection water supply pipe 6, and an injection zone A third passage is provided for connecting the nozzle to the outlet.

[0039] The injection water supply pipe 6 is preferably connected to the diffuser screw 3 and the shower screen. 4.

[0040] During use, if the user wishes to prepare espresso coffee, the user presses the button. Press (or in any other way start the extraction process). The injection water is The water is drawn out through the outlet pipe of the solenoid valve 9 and the coffee powder is drawn out through the injection water supply pipe 6. Pressurized water is supplied to the injection water supply pipe 6 (see Figure 5) until it is completely filled. Pressurized hot water then flows into the empty space above the coffee pack.

[0041] The "empty space" (or similar expression) above the coffee powder pack is defined in this specification and patent. In the claims, the container is filled with water before the preparation of espresso coffee begins. This space or volume is defined as the space (or volume) at the bottom that is free of coffee grounds. At the top it is bounded by the pack and at the bottom by the coffee boiler. The empty space is typically It includes a pre-injection chamber, an injection solenoid valve, and a pipe for supplying injection water. "Pre-infusion chamber" means a chamber that is bounded at the bottom by the upper surface of the coffee pack and laterally by the The filter is bounded at the top by the side wall of the filter that contains the block, and at the top by the bottom of the discharge group. In the following, empty spaces will be represented by the letter "V".

[0042] The espresso coffee machine according to the present invention is provided with a coffee bag located above the coffee pack and a pouring The volume of empty space not intended for use can be estimated directly or indirectly. Cut.

[0043] The main purpose of the machine according to the invention is to reproduce the amount of water passing through the coffee pack during preparation for infusion. To achieve this, the extraction step begins with Before filling the empty space above the coffee pack, the amount of water used must be specified. The machine according to the invention requires a constant flow of water through the pack for each coffee pour. and determining how much of the total amount of water dispensed fills the void space. Evaluate whether it will be used to add value.

[0044] According to a first embodiment, the machine comprises a volume meter ( The flow meter 16 is preferably located immediately downstream of the injection solenoid valve 9 (see FIG. 10a). Alternatively, the flow meter 16 may be located further downstream or upstream of the injection solenoid valve 9. , may be located elsewhere. Connection between flow meter 16 and control and / or processing unit 60 can be achieved using cables or wirelessly.

[0045] In accordance with the present invention, the flow deceleration detected by the flow meter 16 is This indicates that the space V is filled. When the coffee dispense process begins, the heating continues until the empty space above the coffee pack is filled. Pressurized water begins to flow freely in the injection water supply pipe 6. When the entire volume V is filled, The flow of water is slowed down by the resistance of the coffee puck. This resistance is typically This is detected by a sudden drop in the rotational speed of the flow meter 16.

[0046] Filling the empty space V above the coffee pack by determining when deceleration occurs It is possible to calculate the amount of water used to inject the Since the calculation can be started, the end of the pre-injection step can be determined.

[0047] According to a second embodiment, the machine comprises a pressure transducer 24 connected to a control unit (CPU) 60. The pressure transducer 24 is preferably located near the discharge group and is connected to the coffee boiler. The pressure transducer 24 is in fluid communication with the flow meter 16 (see Figures 3 and 10b). The connection between the pressure transducer 24 and the control and / or processing unit 60 may be by cable or This can be achieved using radio.

[0048] In accordance with the present invention, the increase in pressure detected by pressure transducer 24 indicates that the pressure above the coffee pack This indicates that the empty space and the injection water supply pipe 6 are filled. When the dispenser starts dispensing the required amount of espresso coffee, the empty space above the coffee pack Pressurized hot water begins to flow freely through the injection water supply pipe 6 until the volume is filled. Once filled, the pressure in the empty space above the coffee pack increases to the dispensing value. Pressurized water then begins to pass through the coffee pack and is detected by the pressure transducer 16. The pressure measured is the discharge pressure generated by the pump 10. The discharge pressure value is It can be set as a variable pressure profile.

[0049] Filling the pipe above the coffee pack by determining when an increase in pressure occurs It is possible to calculate the amount of water used for injection and start calculating the amount of water used for injection. Since this allows the completion of the pre-injection step to be determined.

[0050] According to the third embodiment, the machine 1000 is configured to dispense a cup located below its dispensing group 1003. (or other container) means 29 (see FIG. 3) for detecting a change in weight or mass of the beverage in the container; The change in weight or mass of the beverage in the cup is measured by the amount of the coffee powder pack above. This indicates that the empty space in the espresso machine has been filled. When the coffee dispensing process begins, the empty space above the coffee pack is filled. Pressurized hot water begins to flow freely in the injection water supply pipe 6. When this entire volume is filled, the The pressurized water begins to pass through the coffee powder pack and into the cup below the discharge group. When a change in weight or mass occurs, the machine can determine the amount of water used for injection. This is the point in time at which the end of the pre-injection step can be determined.

[0051] The metering unit 29 is preferably connected by cable or wirelessly to a control and / or processing unit It is connected to 60.

[0052] Regarding the determination of the filling of the empty space above the coffee pack, Two or more can be combined, thus allowing the opening of the pressurized water flow used in the actual extraction process. Needless to say, this allows for more accurate start-up.

[0053] For example, according to other embodiments, a pressure transducer associated with the flow meter may be provided. If two or more devices for indicating filling are combined, the machine control unit shall The values ​​(in this case, pressure and flow rate) are managed, and a single filling end point (end of pre-injection and The system is programmed to check for the start of dispense and the start of the dispense.

[0054] According to some embodiments, a parameter indicating filling in the empty space above the coffee pack is The meter value may be used for ongoing dispensing operations and / or to improve detection accuracy and / or speed. This can be used for subsequent dispensing operations with a self-learning mechanism to

[0055] 7, 8 and 9 show three different flow charts for the three main methods according to the present invention. -Chart shown.

[0056] The flow chart of Figure 7 shows the parameters that indicate the filling of the empty space above the coffee pack. The present invention relates to a first embodiment in which the data is a flow parameter.

[0057] In the method of the present invention, the delivery of espresso coffee (single, double, etc.) is started. After (100), the flow rate is monitored (101) using, for example, a flow meter 16. Then, a button is pressed to indicate that the empty space above the coffee powder pack is completely filled. A detection (202) of a slowdown in the flow or flow rate value below a certain threshold is performed. Once the empty space on one side is completely filled, add the desired amount of air into the cup. To obtain a pressurized coffee, pressurized water is dispensed in a predetermined amount and / or for a predetermined time. (104) The pressure of the hot water dispensed before the time when the empty space is filled is The pressure after the desired espresso coffee in the cup may be less than that after the desired espresso coffee in the cup. The amount of powder used to obtain the desired extraction ratio (dilution ratio between water and coffee powder) The amount may depend on other considerations, such as weight and / or volume.

[0058] The flow chart of FIG. 8 shows the parameters that indicate the filling of the empty space above the coffee pack. The second embodiment relates to a second embodiment in which the data is a pressure parameter.

[0059] In the method of the present invention, the delivery of espresso coffee (single, double, etc.) is started. After (200), the pressure value is monitored (201) using, for example, a pressure transducer 24. Then, the empty space above the coffee powder pack is completely filled. A detection (202) of a discharge pressure value exceeding a predetermined threshold is performed. Once you have confirmed that the empty space is completely filled, pour the desired amount of espresso into the cup. To obtain the coffee, pressurized water is dispensed in a predetermined amount and / or for a predetermined time ( 204). The pressure of the hot water dispensed before the time when the empty space is filled is The pressure after the point may be less than the desired amount of espresso coffee in the cup. is the amount of powder used to obtain the desired extraction ratio (dilution ratio between water and coffee powder), Or it may depend on other considerations, such as weight and / or volume.

[0060] The flow chart of FIG. 9 shows the parameters that indicate the filling of the empty space above the coffee pack. The present invention relates to a third embodiment in which the data is a weight or mass parameter.

[0061] In the method of the present invention, the delivery of espresso coffee (single, double, etc.) is started. After (300), the mass or weight value of the container receiving the beverage is monitored (301). In this case, for example, a weighing device 29 can be used. The weight of the empty containers is then A mass or weight value greater than the quantity or mass (tare weight) is detected (302). The empty space above the coffee powder pack is completely filled and part of the beverage is poured into the container (cup). This indicates that the coffee powder pack has started to be received within the specified time. Once it is confirmed that the cup is completely filled, the desired amount of espresso coffee is poured into the cup. Pressurized water is dispensed (304) in a predetermined amount and / or for a predetermined time to obtain the empty space. The pressure of the hot water dispensed before the point at which the supply is filled will be higher than the pressure after that point. The desired amount of espresso coffee in the cup may be smaller than the desired extraction amount. the amount of powder used to obtain the ratio (dilution ratio between water and coffee powder) or other requirements, For example, it may depend on weight and / or volume.

Claims

1. A machine (1000) for preparing and dispensing espresso coffee, comprising a coffee bottle a filter holder (8) with a filter for a pressed coffee powder pack; ), a pre-infusion chamber (PC), and a coffee boiler (1) to the pre-infusion chamber and a water pressure circuit (6, 9) for conveying pressurized water to the PC. The parameter values ​​(F, P, W) indicating the filling of the pre-injection chamber and the hydraulic circuit (6, 9) and a device (16, 24, 29) for detecting a change in the fill parameter value. Based on the change in (P, F, W), the step of discharging espresso coffee is started. A machine that can do this.

2. 2. The machine (1000) according to claim 1, wherein the pre-injection chamber and the hydraulic circuit ( 6, 9) the device for detecting the parameter values ​​(F, P, W) indicative of the filling of a flow meter (16) Machines including.

3. 3. The machine (1000) of claim 1 or 2, wherein the flow meter (16) measures the deceleration of the water flow. and a deceleration of the water flow is detected by the pre-injection chamber and the water pressure circuit (6 ,9) Filling machine.

4. A machine (1000) according to any one of claims 1 to 3, wherein the pre-infusion chamber and and a pre-measurement device for detecting the parameter values ​​(F, P, W) indicative of the filling of the hydraulic circuit (6, 9). The apparatus includes a pressure transducer (24).

5. 5. The machine (1000) of claim 4, wherein the pressure transducer (24) detects a water pressure difference. The pressure difference between the pre-injection chamber and the water pressure circuit (6, 9 ) machine showing filling.

6. A machine (1000) according to any one of claims 1 to 5, wherein the pre-infusion chamber and and a pre-measurement device for detecting the parameter values ​​(F, P, W) indicative of the filling of the hydraulic circuit (6, 9). The machine includes a weighing device (29).

7. 7. The machine (1000) according to claim 6, wherein the metering device (29) is configured to detect a change in weight or mass in a container for receiving the coffee. and the change in weight or mass determines the filling of the pre-injection chamber and the hydraulic circuit (6, 9). Showing machine.

8. Method for preparing espresso coffee using an espresso coffee machine The machine comprises a coffee boiler (1) and a frame for pressing coffee powder packs. A filter holder (8) with a filter, a pre-infusion chamber (PC), and the coffee boiler. a water pressure circuit (6, 9) for conveying pressurized water from the pump (1) to the pre-injection chamber (PC); and the method includes filling the pre-filling chamber (PC) and the hydraulic circuit (6, 9). detecting a change in the parameter values ​​(F, P, W); and discharging espresso coffee based on the change in the values ​​(P, F, W). Law.

9. 9. The method of claim 8, wherein the change in the filling parameter values ​​(F, P, W) affects the water flow. parameters indicating the water pressure, and parameters indicating the amount of espresso coffee dispensed into the container. A method comprising a change in at least one of the parameters indicative of weight or mass.

10. 10. The method of claim 9, wherein the change in the filling parameter values ​​(F, P, W) is a function of the water flow. Methods involving deceleration, or pressure differential, or change in weight or mass.

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