US Patent No. 10,219,327

METHOD FOR TEMPERATURE DETERMINATION


Patent No. 10,219,327
Issue Date February 26, 2019
Title Method For Temperature Determination
Inventorship Marcus Frank, Oberderdingen (DE)
Elmar Herweg, Oberderdingen (DE)
Marius Lehner, Muehlacker (DE)
Michael Stober, Oberderdingen (DE)
Assignee E.G.O. Elektro-Geraetebau GmbH, Oberderdingen (DE)

Claim of US Patent No. 10,219,327

1. A method for determination of a temperature in an induction hob, said induction hob comprising a plurality of induction heating coils, wherein said induction heating coils can be individually driven and, in a common heating mode, form a cooking point for a cooking vessel containing water, wherein said method comprises the following steps:positioning a cooking vessel with a cooking vessel bottom containing water such that said cooking vessel covers at least two said induction heating coils by way of said cooking vessel base;
operating said induction heating coils in said common heating mode in order to bring said water in said cooking vessel to boil, this intending to be detected as temperature determination;
during said common heating mode, heating, by said induction heating coils, a region of said cooking vessel base being arranged above said induction heating coil;
during said common heating mode, detecting, by at least one said induction heating coil, an oscillation response indicating whether a temperature of said region of said cooking vessel base above said induction heating coil changes or increases with a temperature gradient;
operating said induction heating coils in said common heating mode at least until one said induction heating coil detects that said temperature gradient of said cooking vessel base above said induction heating coil is approaching zero or has reached zero;
determining at least one of said induction heating coils to be a measuring coil; and
operating said measuring coil in a measuring mode and no longer in said common heating mode, with said measuring coil, in said measuring mode with a measuring power of up to a maximum of 50% of a maximum power of said induction heating coil, transmitting energy into said cooking vessel base for a short time and then detecting a fed-back oscillation response, with a time profile of said oscillation response being evaluated after several coupling-in operations of said measuring power, with said water in said cooking vessel being determined to be boiling in an event that said gradient of said time profile is approaching zero or has reached zero.