Systems and methods for controlling gas powered appliances
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Solution Overview
Problem
Conventional gas-fired water heaters face challenges in reliably opening the main gas valve to initiate gas flow for heating, leading to inefficiencies and potential failures in maintaining setpoint water temperatures.
Innovation Solution
A control system with a valve pick system and a capacitor-switch configuration that attempts to open the main gas valve using two distinct methods, ensuring successful valve opening by alternating between energy discharge and rapid coupling/decoupling to handle sticking valves and ensure consistent gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single method is used to pick the main gas valve, then the device complexity is reduced, but the reliability of valve opening is insufficient leading to heating failures
Solution Approach 1:
The system dynamically switches between two different valve picking methods based on real-time feedback. The controller monitors whether the first pick method successfully opens the valve, and if not, automatically transitions to the second pick method. This dynamic adaptation resolves the contradiction by making the control system flexible and responsive rather than static, thereby improving reliability without permanently increasing complexity.
Solution Approach 2:
The system changes the electrical parameters applied to the valve coil by using two distinct picking methods with different capacitor discharge characteristics. The first method uses a standard capacitor discharge, while the second method uses a different capacitor value or discharge configuration. This parameter variation allows the system to overcome valve sticking issues that a single fixed parameter cannot address, thus improving reliability.
2Reliability
If the capacitor is coupled to the main gas valve for a longer duration to ensure opening, then the reliability improves, but the power consumption increases
Solution Approach 1:
The controller dynamically adjusts the capacitor coupling duration based on the detected valve response. If the valve opens successfully with a short coupling duration, the system terminates early, minimizing power consumption. If the valve does not open, the controller extends the coupling duration or switches to the second pick method with adjusted timing. This dynamic timing adjustment ensures reliability while optimizing energy efficiency.
Solution Approach 2:
The system uses periodic capacitor discharge pulses rather than continuous power application. The controller applies brief, periodic bursts of energy to the valve coil through the capacitor, checking after each pulse whether the valve has opened. This periodic action reduces overall power consumption compared to continuous coupling, while still achieving reliable valve opening through repeated attempts.
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 system effectively maintains setpoint water temperatures by ensuring reliable gas valve operation, reducing failure rates and improving heating efficiency through repeated attempts with different pick methods and safety features to prevent power mismanagement.
Implementation Method 1
The valve pick system includes a capacitor and a switch. The capacitor is configured to store energy from the power system
Implementation Method 2
closing the switch of the valve pick system to couple the capacitor to the main gas valve for a first length of time to discharge the energy stored in the capacitor to the main gas valve
Data Source
AI summary
A method of controlling a gas powered water heater includes attempting to pick a main gas valve of the main burner using a first pick method. The first pick method includes closing a switch of a valve pick system to couple a capacitor of the valve pick system to the main gas valve for a first length of time to discharge energy stored in the capacitor to the main gas valve, and opening the switch of the valve pick system after the energy stored in the capacitor is discharged to the main gas valve. The controller determines if the main gas valve is open after using the first pick method. When the controller determines the main gas valve is not open, the controller attempts to pick the main gas valve using a second pick method different than the first pick method.