Control Device Temperature Calculation Halting
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Solution Overview
Problem
Conventional control devices for managing electric current through wires may inaccurately calculate wire temperatures due to programming bugs or calculator malfunctions, leading to increased power consumption as they fail to reduce calculation frequency when temperatures are lower than a predetermined threshold.
Innovation Solution
A control device that calculates the temperature difference between the wire and ambient temperature, interrupting the current if the sum exceeds a threshold and halting calculations if the temperature difference is below a second threshold or if a predetermined time period for interruption exceeds, ensuring low power consumption even with erroneous calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device continuously calculates wire temperature to prevent smoke generation, then wire safety is improved, but power consumption increases
Solution Approach 1:
The control device performs temperature calculations periodically at predetermined cycles rather than continuously. The calculation cycle is set based on the thermal time constant of the wire, performing calculations at intervals that are sufficient to detect temperature trends while allowing the system to enter low-power states between measurements. This periodic approach reduces power consumption while maintaining adequate safety monitoring.
Solution Approach 2:
The control device dynamically adjusts the temperature calculation cycle based on operating conditions. When the wire temperature is determined to be stable and well below smoke generation thresholds, the calculation interval is extended. When temperature changes are detected or the wire approaches critical thresholds, the calculation frequency increases automatically. This dynamic adaptation optimizes the balance between safety monitoring and power consumption.
2Use of energy by moving object
If the control device extends the temperature calculation cycle to reduce power consumption, then power consumption is reduced, but temperature detection accuracy deteriorates
Solution Approach 1:
The control device performs preliminary temperature calculations at shorter intervals during initial operation or when temperature changes are detected. These preliminary measurements establish a baseline and detect trends before committing to extended calculation cycles. This preliminary action ensures that temperature detection accuracy is maintained during critical periods while allowing power-saving extended cycles during stable conditions.
Solution Approach 2:
The control device uses feedback from temperature measurement results to adjust subsequent calculation cycles. When temperature measurements show stable conditions well below safety thresholds, the system extends the calculation interval to reduce power consumption. When temperature trends indicate approaching thresholds or unexpected changes occur, the feedback mechanism triggers more frequent calculations to maintain detection accuracy. This feedback-based adaptation resolves the contradiction between power saving and measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces power consumption by accurately determining when to halt temperature difference calculations, preventing unnecessary computation and conserving energy, even if the temperature is erroneously calculated.
Implementation Method 1
The wire generates Joule heat when an electric current flows through the wire
Data Source
AI summary
A control device that can realize low power consumption even if the temperature of a wire is erroneously calculated. A control unit calculates, for each of one or more wires, a temperature difference between an ambient temperature of the wire and a temperature of the wire over time, and supplies/interrupts an electric current that flows through the wire. The control unit interrupts, for each of the wires, the electric current if the temperature sum of the calculated temperature difference and the ambient temperature is greater than or equal to a first threshold. The control unit measures a time period in which the electric current is being interrupted. If, for each of the wires the calculated temperature difference is less than a second threshold or the measure time period exceeds a predetermined time period, the control unit halts the calculation of the temperature of the wires.