PWM Valve Control for Hands-Free Fluid Temperature and Flow
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Solution Overview
Problem
Conventional fluid-dispensing systems do not operate in a hands-free mode, requiring manual adjustment for desired flow rate and temperature, leading to inefficiencies and fluid waste.
Innovation Solution
A system utilizing a processor, PWM modules, timers, and motors to control fluid flow rate and temperature through valves, enabling hands-free operation by translating user inputs into PWM signals to drive valve stems, allowing independent control of fluid streams from remote devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional manual control methods are used, then the system is simple to operate, but hands-free operation is not available leading to fluid waste and inefficiency
Solution Approach 1:
The patent replaces manual mechanical control with an automated electronic control system using PWM (pulse width modulation) technology. The processor generates PWM signals that are converted to analog voltages through RC circuits, which then control the valve motors automatically based on sensor feedback, eliminating the need for manual mechanical adjustment while achieving hands-free operation.
Solution Approach 2:
The system incorporates feedback mechanisms where sensors detect actual fluid flow rate and temperature, and the processor automatically adjusts valve positions to maintain desired setpoints. This self-regulating capability enables hands-free operation where the system serves itself by continuously monitoring and correcting its own performance without user intervention.
2Productivity
If manual adjustment is required for flow rate and temperature, then the control system is simple, but fluid waste occurs due to delayed response
Solution Approach 1:
The patent implements feedback control where sensors continuously monitor actual fluid flow rate and temperature, compare them with desired setpoints, and send error signals to the processor. The processor then adjusts PWM duty cycles to correct any deviations, creating a closed-loop system that responds automatically to maintain optimal conditions and prevent fluid waste.
Solution Approach 2:
The system maintains continuous monitoring and adjustment of fluid parameters through ongoing PWM control signals to the valve motors. This continuous action ensures that flow rate and temperature remain at desired levels without interruption or delay, maximizing dispensing efficiency and preventing waste that would occur with intermittent manual adjustment.
3Speed
If two knobs or single handle are used for control, then the interface is simple, but rapid adjustment response is limited
Solution Approach 1:
The patent uses PWM (pulse width modulation) technology where the processor generates periodic square wave signals at frequencies typically between 20-100 Hz. These periodic signals are converted to analog voltages through RC circuits, providing rapid and precise control of valve motor positions. The periodic nature of PWM allows for fast response times while maintaining ease of operation through automatic control.
Data Source
AI summary
Fluid-dispensing systems and methods relating thereto are described. A method of dispensing an output fluid stream includes: (i) receiving a temperature setting for a desired temperature of the output fluid stream and a mechanical disturbance for a desired flow rate of the output fluid stream; (ii) converting each of the temperature setting and the mechanical disturbance to a first valve PWM signal and a second valve PWM signal; (iii) conveying the first PWM signal to a first motor and the second PWM signal to a second motor; and (iv) activating the first motor to open the first valve to produce a first fluid flow at a first fluid flow rate and second motor and the first motor to open the second valve to produce a first fluid flow at a first fluid flow rate. The combination of the first fluid flow and the second fluid flow produces the desired output fluid stream.