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Oven with improved self-cleaning cycle

  • US 5,534,678 A
  • Filed: 11/12/1993
  • Issued: 07/09/1996
  • Est. Priority Date: 11/12/1993
  • Status: Expired due to Term
First Claim
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1. A pyrolytically cleaned cooking oven having:

  • a liner forming a cooking chamber;

    a smoke eliminator having an entrance communicating with said chamber through said liner;

    first heating means positioned in the portion of said chamber adjacent said smoke eliminator entrance and second heating means positioned in a portion of said chamber remote from said smoke eliminator entrance;

    temperature sensing means for sensing the temperature in said chamber; and

    control means for providing a pyrolytic cleaning operation of said oven, said control means being connected to said first and second heating means and to said sensing means and constructed and arranged selectively to continuously energize said heating means and to energize said heating means in a cyclical mode of operation with predetermined duty cycles in which the time of energization of each heating means during each duty cycle is substantially shorter than the overall period of that cyclical mode of operation so that the heat output of the cyclically operated heating means is less than it would be with a continuous operation mode for a corresponding period of time;

    said control means being effective to continuously energize said first heating means until said sensing means senses a predetermined trigger temperature;

    to thereafter cyclically energize at least a selected one of said heating means with a predetermined duty cycle until said sensing means senses a predetermined off temperature, higher than the trigger temperature; and

    to thereafter deenergize both of said heating means from each time said sensing means senses the off temperature until said sensing means subsequently senses a predetermined on temperature, lower than the off temperature, and to cyclically energize at least a selected one of said heating means from each time said sensing means senses the on temperature until said sensing means subsequently senses the off temperature.

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