Brewing Device Closing Body Position Control Using Hall Effect Sensors
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Solution Overview
Problem
Brewing devices for coffee or tea machines face issues with electric actuation due to production deviations causing varying mechanical behavior and electrical current absorption, leading to incorrect positioning and frequent malfunctions, as well as challenges with the on-board sensory system due to incorrect sensor placement and interchangeability with different types of brewing devices.
Innovation Solution
The brewing device incorporates a combination of an electronic machine control unit and an electronic brewer control system, featuring a barrel cam mechanism for precise movement of the closing body and an on-board electronic control system with improved sensor placement and communication architecture to enhance positioning accuracy and interchangeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electric actuators are used for the closing body, then the device can be manufactured with standard components, but production deviations cause varying mechanical behavior and electrical current absorption leading to incorrect positioning and malfunctions
Solution Approach 1:
The patent implements a feedback mechanism using Hall effect sensors to detect the position of the closing body and magnets on the cam mechanism. The control unit receives signals from these sensors and adjusts the motor actuator accordingly to achieve precise positioning despite manufacturing variations. This closed-loop feedback system compensates for production deviations and ensures reliable positioning accuracy.
Solution Approach 2:
The patent changes the control parameter from open-loop motor control to closed-loop position-based control. By using Hall effect sensors to detect magnetic field changes associated with cam positions, the system transitions to parameter-based control that adapts to actual mechanical behavior, resolving the issue of inconsistent positioning due to manufacturing variations.
2Measurement precision
If Hall effect sensors are placed on the head of the brewing device to detect cam positions, then the positioning system can be implemented, but incorrect sensor placement and current absorption variations result in frequent incorrect positioning
Solution Approach 1:
The patent introduces magnets as intermediary elements mounted on the cam mechanism. These magnets serve as mediators between the mechanical cam positions and the Hall effect sensors. The magnetic field created by these magnets provides a reliable and consistent detection mechanism that is less sensitive to exact sensor placement, thereby improving measurement precision while reducing placement sensitivity issues.
Solution Approach 2:
The patent replaces direct mechanical position sensing with magnetic field-based sensing using Hall effect sensors. This substitution eliminates the need for precise mechanical alignment and contact-based sensing, allowing for more tolerant sensor placement while maintaining high measurement precision through non-contact magnetic field detection.
3Reliability
If multiple patches are added to control software to handle positioning errors, then the closing body can be unlocked and positions restored, but the control software becomes significantly burdened and timing of dispensing cycle worsens
Solution Approach 1:
The patent implements preliminary action by pre-configuring the control unit with expected Hall effect sensor signal patterns corresponding to correct cam positions. The system proactively verifies positioning by comparing actual sensor readings against these pre-established patterns, enabling automatic error detection and recovery without requiring complex post-error patches or interventions.
Solution Approach 2:
The control system performs self-service by automatically detecting positioning errors through Hall effect sensor feedback and autonomously executing correction routines. The microcontroller monitors sensor signals, identifies positioning deviations, and triggers appropriate corrective actions without external intervention, reducing software complexity compared to manual patch-based error handling.
4Adaptability or versatility
If brewing devices are designed with specific electrical and electronic components for interchangeability, then different types of brewing devices can be interchanged, but significant electrical matchings and supplementary electronic circuit boards are required
Solution Approach 1:
The patent implements universality by designing the brewing device with standardized electrical connections and a modular electronic control unit that can interface with different machine types. The control unit is configured to work with various brewing device types through universal communication protocols and standardized electrical interfaces, enabling interchangeability without requiring significant electrical matchings or supplementary circuit boards for each device type.
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 solution reduces the complexity of motor control software, improves the accuracy and reliability of the brewing process, and allows for easier interchangeability with other brewing devices by standardizing electrical and electronic components, thus overcoming the limitations of existing brewing devices.
Implementation Method 1
the various positions of the closing body are sensed through two Hall effect sensors arranged on the head of the brewing device, at the opening of the brewing chamber, so as to identify the passage of four magnets mounted on one of the two disc cams
Data Source
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AI summary
An electronic control system for a brewing device for a machine for preparing beverages, in particular coffee or tea. The brewing device comprises a brewing chamber having an opening through which a material to be brewed may be loaded and discharged; a closing body movable away from and towards a sealed closing position of the opening angularly spaced apart from the closing position, through an intermediate ejection position, in which the closing body is raised with respect to the closing position along the longitudinal axis of the brewing chamber; a piston slidably mounted in the brewing chamber in a position axially opposite the closing body; a first electric actuating device for the movement of the closing body; and a second electric actuating device for the movement of the piston. The electronic control system is configured to be arrangeable in the brewing device and comprises a sensory system configured to output electrical signals to allow the reaching, by the closing body, of the opening, closing and ejection positions to be sensed, and the axial position of the piston in the brewing chamber to be determined, and an on-board electronic control unit configured to be connectable to the sensory system to receive electrical signals therefrom, to the first and second electric actuating device to supply electrical control signals thereto, and to an electronic control unit of the beverage preparation machine external to the brewing device to receive therefrom commands relating to the operation of the brewing" device. The on-board electronic control unit is further configured to execute commands received from the external control unit to responsively output, also based on the electrical signals received from the sensory system, electrical control signals for the electric actuating devices.