Frozen Beverage Dispenser Pressure Feedback Control
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Solution Overview
Problem
Existing frozen carbonated beverage machines face challenges in maintaining consistent carbon dioxide flow rates due to variations in discharge pressure from pressure regulators, leading to fluctuations in the carbon dioxide content of the finished product, which affects the desired drink consistency.
Innovation Solution
A food dispensing machine equipped with a pressure measurement device and a controller that adjusts the gas flow control signal to the flow control device, using pulse-width modulation to dynamically control the carbon dioxide flow rate based on measured pressure, ensuring consistent product consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If pressure regulator is used to control gas flow rate, then gas pressure can be regulated, but discharge pressure varies causing flow rate fluctuations
Solution Approach 1:
The system uses a pressure sensor to continuously monitor the discharge pressure from the regulator and feeds this information back to a controller. The controller dynamically adjusts the solenoid valve opening based on the feedback signal to compensate for pressure variations, thereby maintaining consistent gas flow rate despite regulator drift or pressure changes.
Solution Approach 2:
The system transitions from a static pressure regulation approach to a dynamic control system. The solenoid valve opening is continuously adjusted based on real-time pressure measurements, allowing the system to adapt to changing conditions and maintain stable flow rate dynamically rather than relying on fixed regulator settings.
2Reliability
If inlet pressure to regulator is increased, then discharge pressure range becomes low enough not to affect flow rate, but system complexity and pressure requirements increase
Solution Approach 1:
Instead of increasing inlet pressure to compensate for regulator variations, the system implements a feedback control loop that actively monitors discharge pressure and adjusts the solenoid valve accordingly. This approach achieves flow rate stability without requiring higher pressure inputs or more complex pressure regulation hardware.
Solution Approach 2:
The system replaces reliance on mechanical pressure regulator characteristics with an electronically controlled solenoid valve system. The electronic control can precisely modulate the valve opening based on feedback signals, providing superior flow control compared to purely mechanical regulation methods.
3Stress or pressure
If pressure regulator drifts, then discharge pressure varies, but regulator replacement or recalibration is required
Solution Approach 1:
The feedback control system continuously monitors actual discharge pressure and compensates for regulator drift by adjusting the solenoid valve opening. This eliminates the need for periodic regulator recalibration or replacement, as the system automatically adapts to regulator variations through electronic control.
Solution Approach 2:
The system performs self-correction by using the pressure sensor feedback to automatically adjust the solenoid valve and compensate for regulator drift. This self-regulating capability reduces maintenance requirements and ensures consistent performance without manual intervention.
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 solution effectively stabilizes the carbon dioxide flow rate, maintaining consistent product consistency and overrun levels, thereby ensuring a reliable and precise control over the beverage's carbonation and texture.
Implementation Method 1
A pressure measurement device is configured to output a gas pressure signal
Implementation Method 2
using pulse-width modulation to dynamically control the solenoid and maintain a consistent carbon dioxide flow rate
Implementation Method 3
dynamically control the solenoid
Implementation Method 4
A flow control device is configured to control ingredients flow from the ingredients source to the product chamber
Implementation Method 5
freezing a mixture of water, syrup concentrate and carbon dioxide in a mixing, or freezing, chamber
Implementation Method 6
The freezing chamber is typically surrounded by a coil that contains refrigerant to cause freezing of the mixture inside
Data Source
AI summary
A food dispensing machine includes a product chamber and an ingredients source including a gas source connected to the product chamber. A flow control device is configured to control ingredients flow from the ingredients source to the product chamber. A pressure measurement device is configured to output a gas pressure signal, and a controller is configured to receive the gas pressure signal and determine a gas flow control signal based on the gas pressure signal. The controller outputs the gas flow control signal to the flow control device.