| 摘要 |
The invention relates to a method for the recognition of a capsule (1) for food preparations within a machine (100) for the preparation of food products, said capsule (1) comprising an electric circuit (10) that includes at least one capacitive element (1 1) and one inductive element (12) electrically connected in series between a pair of electrical terminals (41, 42) of the capsule (1 ), said method comprising the following steps: i) applying an AC voltage to said electrical terminals (41, 42) and detecting a first impedance value of said electric circuit (10); ii) varying the frequency of said AC voltage applied to said electrical terminals (41, 42) and detecting at least one second impedance value of said electric circuit (10); iii) comparing all the impedance values so detected of said electric circuit (10) with corresponding reference values stored in lookup tables wherein the frequency of said AC voltage is the input variable, each lookup table being associated with a respective food preparation program that may be ran by the machine (100); iv) generating a recognition signal of the capsule (1 ) indicating that it is authentic if the impedance values so detected correspond to respective reference values contained in one of the lookup tables. The invention also relates to a capsule and to a machine configured to allow implementation of said method. |
