John P Courtney

US Patent:

6381518, Apr 30, 2002

Filed:

Aug 17, 1999

Appl. No.:

09/376031

Inventors:

Jeffrey M. Huffington - Geneva IL
Robert J. Alvord - Elmwood Park IL
John L. Courtney - Carol Stream IL
Kimble Vitkus - Sycamore IL

Assignee:

Ranco Incorporated of Delaware - Wilmington DE

International Classification:

G05D 2300

US Classification:

700299, 700300, 700211, 700207, 219497, 374149

Abstract:

An oven temperature controller for regulating temperature to a temperature setpoint over a temperature range in an oven compartment comprising a microprocessor and memory storage means. The memory storage means stores temperature setpoint related information for temperature setpoints over the temperature range and this information is used by the microprocessor for establishing an upper control limit curve and a lower control limit curve. The upper control limit curve and lower control limit curve have no discontinuities over a majority of the temperature range and at least one of these curves is non-parallel to a temperature setpoint line, the temperature setpoint line formed in a stepwise linear manner between temperature setpoints as the temperature setpoint is varied over the temperature range.