Oven with improved self-cleaning cycle
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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Accused Products
Abstract
A pyrolytically cleaned oven includes an upper broil element and a lower bake element, the broil element is energized until the oven temperature reaches a trigger temperature, well below the glass transition temperature point of the oven porcelain enamel; then the bake and broil elements are alternately energized in a cyclical manner until an off temperature, somewhat above the trigger temperature but still below the transition temperature, is reached. Thereafter one or both of the elements are cycled to maintain the temperature with a range between the off temperature and a lower on temperature, also within the effective self cleaning range.
34 Citations
30 Claims
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1. A pyrolytically cleaned cooking oven having:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A pyrolytically cleaned cooking oven having:
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a liner forming a cooking chamber;
a smoke eliminator having an entrance communicating with the upper portion of said chamber;broil heating means positioned adjacent the top of said chamber and bake heating means positioned remote from the top of said chamber; 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 broil and bake 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 broil heating means until said sensing means senses a predetermined trigger temperature;
to thereafter cyclically energize only said broil heating means with one predetermined duty cycle and only said bake heating means with another 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 said broil heating means with one predetermined duty and said bake heating means with another predetermined duty cycle from each time said sensing means senses the predetermined on temperature until said sensing means subsequently senses the predetermined off temperature. - View Dependent Claims (14, 15, 16, 17)
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18. A pyrolytically cleaned cooking oven having:
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a liner forming a cooking chamber;
a smoke eliminator having an entrance communicating with the upper portion of said chamber;broil heating means positioned adjacent the top of said chamber and bake heating means positioned remote from the top of said chamber; 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 broil and bake 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 broil heating means until said sensing means senses a predetermined trigger temperature;
to thereafter cyclically energize said broil heating means with a first predetermined duty cycle and cyclically energize said bake heating means with a second predetermined duty cycle until said sensing means senses a predetermined off temperature, higher than the trigger temperature; and
to thereafter cyclically energize only said bake 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 said broil heating means with one predetermined duty and cyclically energize said bake heating means with another predetermined duty cycle from each time said sensing means senses the predetermined on temperature until said sensing means subsequently senses the predetermined off temperature. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A pyrolytically cleaned cooking oven having:
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a liner forming a cooking chamber;
a smoke eliminator having an entrance communicating with said chamber;first heating means positioned in said chamber adjacent said smoke eliminator entrance and second heating means positioned in 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 selectively energize at least one of said first and second heating means in a predetermined manner to maintain the temperature sensed by said sensing means between the off temperature and an on temperature, lower than the off temperature. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification