Hot Beverage Device Temperature-Based System Check Without Flow Meter
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Solution Overview
Problem
Conventional hot beverage preparation devices without a flow meter lack system checks for the function of individual components, such as heating and pumping, which compromises operational safety and troubleshooting.
Innovation Solution
A method involving applying electrical power to the heater, detecting temperature changes over a defined period, evaluating these changes against target values, and outputting error messages to facilitate system checks and troubleshooting without a flow meter, allowing for the localization of errors in heating and water presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flow meter is omitted to reduce device complexity and cost, then device complexity and manufacturing cost are reduced, but the ability to perform system checks and detect component failures is lost
Solution Approach 1:
The patent introduces a temperature sensor as an intermediary component to indirectly monitor system state without requiring a flow meter. The temperature sensor detects temperature changes in the water flow, which serve as a proxy indicator for flow presence and heater functionality, enabling system checks through thermal measurement rather than direct flow measurement.
Solution Approach 2:
The patent replaces the mechanical flow measurement system (flow meter) with a thermal measurement system (temperature sensor). Instead of mechanically measuring water flow rate, the system uses temperature changes caused by heater operation to infer flow conditions, substituting a mechanical measurement approach with a thermal field-based approach.
2Device complexity
If system checks are eliminated to simplify the device, then device complexity is reduced, but operational safety and troubleshooting capability deteriorate
Solution Approach 1:
The system performs self-diagnosis by automatically monitoring temperature changes during heater operation and comparing them against expected values. The control unit evaluates whether the observed temperature change falls within a predefined range, and if not, triggers an error indication. This self-monitoring capability enables the device to detect its own malfunctions without requiring external inspection or complex diagnostic systems.
Solution Approach 2:
The patent implements a feedback mechanism where the temperature sensor continuously monitors the thermal state of the water, and the control unit uses this information to evaluate system performance. The measured temperature change is fed back to the control unit, which compares it with expected values and adjusts system operation or triggers error signals accordingly, creating a closed-loop safety monitoring system.
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
Enables effective system checks and ensures operational safety by analyzing temperature changes to diagnose issues with heating and water presence, even in the absence of a flow meter, thereby maintaining device functionality and user safety.
Implementation Method 1
applying electrical power to the heater
Implementation Method 2
heating the water in it
Implementation Method 3
detecting a temperature change downstream of the heater
Data Source
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AI summary
A method for controlling a hot drink preparation device (2), in particular such a device for household purposes, having at least one heating system (8), having at least one temperature sensor (10) downstream of said heating system (8), having a pump (14) for conveying water within the preparation device (2), having a control unit (12) for controlling the heating system (8) and the pump (14), includes, according to the invention, the steps of subjecting the heating system (8) to electric power, detecting a change in temperature downstream of the heating system (8) after a defined period of time (b) has passed, evaluating the detected change in temperature by comparing it to a target value (z1), and outputting an error message or continuing/initiating the brewing process.