Cooking Appliance Climate Curve Estimation

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Solution Overview

Problem

Existing methods for displaying the progress of achieving a target climate in a cooking chamber are inaccurate due to their reliance on point-by-point calculations, which do not account for the dynamic changes in climate variables over time.

Innovation Solution

The method involves recording actual values of climate variables at specific intervals, comparing them to setpoint values, and using these comparisons to estimate the time required to reach the target climate, with the course of variables over time being evaluated using linear relationships, stored tables, and time derivatives, and taking into account initial conditions and operational history.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If point-by-point calculation of remaining heating time is used, then the display is simple to implement, but the accuracy of the heating progress indication deteriorates

Engineering Contradiction:
Improveease of implementationVSAvoidaccuracy of heating progress indication
Core Design Contradiction:
Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent transitions from static point-by-point calculation to dynamic curve-based estimation. The heating progress is determined by comparing actual temperature measurements against a pre-stored reference heating curve that captures the dynamic thermal behavior of the cooking chamber, allowing the system to adapt to varying heating rates and provide more accurate progress indication.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent performs preliminary action by pre-storing reference heating curves under various operating conditions before actual cooking operations. These reference curves, which contain pre-calculated temperature-time relationships, are prepared in advance and stored in memory, enabling the system to quickly compare actual measurements against expected behavior without performing complex real-time calculations.

Inventive Principle:
Principle #10Preliminary action

2Measurement precision

If the course of climate variables over time is taken into account, then the accuracy of target climate timing estimation is improved, but the complexity of the calculation process increases

Engineering Contradiction:
Improveaccuracy of target climate timing estimationVSAvoidcomplexity of calculation process
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent uses copying by creating a simplified reference model (heating curve) that replicates the typical thermal behavior of the cooking chamber. Instead of performing complex real-time physics calculations, the system copies the expected temperature evolution pattern from pre-measured or pre-simulated reference data, allowing accurate timing estimation through simple comparison operations.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The patent applies parameter changes by transforming the complex differential equations governing heat transfer into simplified algebraic relationships based on stored reference curves. The system changes the calculation approach from continuous differential analysis to discrete parameter comparison, evaluating the degree of fulfillment based on stored temperature-time data points rather than solving complex thermal equations in real-time.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentEP2103183B1Method for displaying, particularly a heating or cooling curve, and cooking appliance for carrying out such a method
Publication Date: 2012.11.21 RATIONAL AG
  • EP2103183B1 patent drawingFigure 1~2
  • EP2103183B1 patent drawingFigure 3~4c

AI summary

The invention relates to a method for displaying the curve when a desired climate has been reached in a cooking compartment of a cooking appliance by taking into account at least one actual value of a first variable that changes over time and is characteristic of the climate in the cooking compartment. Said method is characterized in that the actual value of the first variable is detected at least once during an interval t0 to t1 and is compared with a desired value of the first variable, said desired value characterizing the desired climate, a point in time t2 when a second interval is to begin and/or the point in time t3 when the desired climate has been reached is/are estimated in accordance with said comparison, and the curve of the first variable over time is taken into account at least once when estimating the point in time t3 during a second interval t2 to t3, wherein t2 ≥ t1. The invention also relates to a cooking appliance for carrying out such a method.