# US 5,352,865 A · Programmable load compensation method and apparatus for use in a food oven

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- Number: US 5,352,865 A
- Document ID: US5352865A
- Status: Granted
- Kind: A
- Application number: 07/972,771
- Filed: 1992-11-09
- Granted: 1994-10-04
- Earliest claimed: 1991-08-19
- Assignees: Henny Penny Corporation
- Inventors: Douglas A. Burkett; Gary L. Mercer
- Web page: https://patentgrep.com/patent/US5352865A

## CPC

- F24C 7/087: {of electric circuits regulating heat}
- G05D 23/1951: {with control of the working time of a temperature controlling device}
- F24C: DOMESTIC STOVES OR RANGES (exclusively for solid fuels F24B); DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

## Abstract

A method and apparatus is disclosed which automatically adjusts the on-time of preferably quartz lamp heating elements in an oven having both quartz lamp and electric heating elements. In such an oven having dual heating elements, the temperature of the oven's cavity increases when numerous food items (loads) are rapidly cooked in succession. The present invention allows a dual heating element oven to automatically compensate for these increases in temperature by preferably shortening a predetermined on-time of the quartz bulbs. The on-time is continuously compensated using a microcomputer, dependent upon the current oven temperature. The microcomputer preferably uses at least two clocks to shorten the predetermined on-time of the quartz bulbs.

## Claims

### Claim 1

A rotisserie oven for cooking food comprising
heating means for heating food located in the rotisserie oven;
air temperature sensing means for sensing the temperature of air in said rotisserie oven; and,
control means, responsive to the air temperature sensing means for selectively controlling said heating means, wherein said control means is programmable with a predetermined cook time, a predetermined cook temperature and a load compensation factor;
wherein said control means further comprises means for determining an actual cook time derived from said predetermined cook time, the difference between the sensed temperature of the air in said rotisserie oven and the predetermined cook temperature, and the load compensation factor said heating means heating said food for said actual cook time.

### Claim 2 (depends on 1)

The oven of claim 1 wherein said actual cook time is determined by adding a load compensation adjustment to said predetermined cook time if said sensed temperature of air in said rotisserie oven is below said set point temperature and subtracting a load compensation adjustment from said predetermined cook time if said sensed temperature is above said set point temperature.

### Claim 3 (depends on 2)

The oven of claim 2 wherein said load compensation adjustment is determined by multiplying a load compensation factor by the difference between said predetermined cook temperature and the sensed air temperature.

### Claim 4 (depends on 1)

The oven of claim 1 wherein said load compensation adjustment is determined by determining the percent difference between said sensed air temperature and the predetermined cook time.

### Claim 5 (depends on 4)

The oven of claim 4 wherein said percent difference is multiplied by a load compensation factor to obtain a load compensation adjustment and wherein said load compensation adjustment is added to or subtracted from said predetermined cook time.