Coffee machine with milk sensor
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Solution Overview
Problem
Coffee machines lack the ability to automatically recognize the type of milk in a milk jug, leading to incorrect processing and energy wastage due to inefficient steam usage and lack of sensors to detect milk quality and temperature accurately.
Innovation Solution
A coffee machine equipped with a steam dispensing wand featuring a milk sensor, comprising electrical or capacitive sensors with electrodes that contact the milk to determine its type and temperature, integrated with a control unit to adjust frothing recipes and reduce steam waste through a position sensor for wand cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is provided in the base under the milk jug, then the machine can detect milk level, but the sensor cannot contact the milk directly to detect milk quality or type
Solution Approach 1:
The patent introduces a conductivity sensor as an intermediary device that indirectly detects milk properties through electrical conductivity measurements without requiring direct physical contact between the temperature sensor and milk. The conductivity sensor acts as a mediator that translates milk composition into measurable electrical signals.
Solution Approach 2:
The patent replaces direct mechanical/physical contact-based temperature sensing with an electrical field-based conductivity sensing system. Instead of relying on thermal contact, the system uses electrical conductivity measurements to infer milk type and quality, substituting a mechanical sensing approach with an electrical sensing approach.
2Adaptability or versatility
If the machine uses a single steam dispensing channel, then the device complexity is reduced, but the ability to process different milk types with different recipes is limited
Solution Approach 1:
The patent implements a dynamic steam dispensing system where the number of active dispensing channels is not fixed but adapts based on the detected milk type. The system can dynamically activate one or two channels depending on the processing requirements, allowing versatility without permanent complex hardware configuration.
Solution Approach 2:
The patent creates a multi-functional steam dispensing system where the same hardware infrastructure (steam generator and dispensing wand) can perform different functions by activating different numbers of channels. The system universally handles both single-channel and dual-channel operations through a unified control architecture.
3Productivity
If the machine lacks sensors to detect milk type and quality, then the device complexity is reduced, but incorrect processing leads to energy wastage and milk loss
Solution Approach 1:
The patent implements a feedback-based control system where conductivity sensor measurements continuously inform the control unit about milk type and quality. This feedback loop enables real-time adjustments to processing parameters, ensuring optimal energy efficiency and preventing waste by adapting the processing regime to actual milk properties.
Solution Approach 2:
The system performs self-diagnosis and self-adjustment by using conductivity measurements to automatically determine the appropriate processing parameters without external intervention. The machine serves itself by detecting milk properties and autonomously configuring the optimal processing mode, reducing the need for operator knowledge and preventing incorrect processing.
4Ease of manufacture
If the temperature sensor is not in contact with the milk, then the sensor placement is simplified, but the sensor cannot serve as an electrode for electrical conductivity sensing
Solution Approach 1:
The patent segments the sensing functions into separate specialized sensors: a temperature sensor for thermal measurements and a conductivity sensor for electrical property measurements. This segmentation allows each sensor to be optimized for its specific function and installed in the most appropriate location without compromising overall system capability.
Solution Approach 2:
The patent merges the temperature sensor and conductivity sensor into a single integrated sensing assembly that contacts the milk together. This combination allows both thermal and electrical property measurements to be taken simultaneously from the same location, maximizing information gathering while maintaining simple installation procedures.
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
The coffee machine automates milk processing, reduces milk wastage, optimizes energy use by ensuring correct milk delivery, and minimizes steam usage during wand purging, thereby enhancing operational efficiency.
Implementation Method 1
a conductivity sensor suitable for detecting an electrical conductivity value of the milk
Implementation Method 2
a temperature sensor suitable for going in contact with the milk contained in the milk jug and detecting a temperature value of the milk
Implementation Method 3
The steam dispensing nozzle is immersed in the milk contained in a milk jug to inject hot steam that is used to heat the milk
Data Source
AI summary
Disclosed is a coffee machine having a steam dispensing wand with a dispensing nozzle suitable for being immersed in milk contained in a milk jug to dispense steam into the milk and therefore heat and froth the milk, a steam generation system to generate steam that is sent to said wand, and a control unit to operate the steam generation system. The wand has a milk sensor suitable for detecting the presence of milk and the type of milk contained in the milk jug.