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(11) | EP 0 878 667 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Pyrolytic self-cleaning ovens |
| (57) A pyrolytic self-cleaning oven has a cavity 2 heated by a grill element 4 during
a self-cleaning pyrolytic operation, the fumes emitted passing through a porous plug
bearing an oxidation catalyst 11 to remove smoke before the gases are vented at outlet
9. The cycling of the element 4 is controlled by an electronic controller 13 which
receives a signal from a temperature sensor 15 on the catalytic plug. Thus, when the
oven temperature initially rises and volatile substances are vaporised, resulting
in an exothermic reaction at the catalyst, the element 4 is switched off. Only when
a substantial amount of the volatile soil has been evaporated will the temperature
at the oxidation catalyst fall causing the control means 13 to switch the element
4 back on. In this way, the self-cleaning operation is controlled by the temperature
of the oxidation catalyst, and the cleaning operation is terminated with reference
to either a fixed temperature in the oven having been reached or a fixed temperature
differential between the catalyst temperature and the oven temperature having been
achieved. |