Dryer appliance and method for ignition failure detection
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Solution Overview
Problem
Existing dryer appliances may fail to detect ignition failure in gas heater systems, leading to incomplete drying of laundry articles due to continued operation without heat.
Innovation Solution
A dryer appliance with a controller that measures air temperature using a temperature sensor positioned downstream of the ignition source, determines the operational state of the heating system by assessing temperature changes over time, and identifies ignition failure if the temperature remains unchanged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dryer appliance continues operation after ignition failure, then the drying cycle can complete, but the laundry articles fail to be dried properly
Solution Approach 1:
The system implements feedback by continuously monitoring air temperature downstream of the ignition source and comparing it against expected temperature thresholds. When the temperature fails to rise above the threshold within a predetermined time period, the system detects ignition failure and responds by terminating the drying cycle, preventing wasted energy and potential safety issues.
Solution Approach 2:
The patent replaces complex mechanical ignition detection mechanisms with a thermal sensing system. Instead of using mechanical switches or direct ignition system feedback, the system uses a temperature sensor to indirectly detect ignition status by measuring the thermal effect of successful combustion, providing a more reliable and simpler detection method.
2Reliability
If a temperature sensor is positioned downstream of the ignition source, then ignition failure can be detected, but the system complexity increases
Solution Approach 1:
The temperature sensor acts as an intermediary element that indirectly measures ignition status. Rather than directly monitoring the ignition source or gas flow, the system uses the temperature of the air downstream as a mediator to infer whether ignition is occurring, simplifying the detection mechanism while maintaining reliability.
Solution Approach 2:
The system uses the air flow and heating process itself to provide the detection signal. The air being heated by the ignition source carries thermal information back to the sensor, allowing the system to self-diagnose ignition status using the existing operational parameters without requiring separate complex detection hardware.
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
Effectively detects ignition failure and prevents further operation, ensuring that laundry articles are properly dried by discontinuing the dryer cycle when ignition failure is determined.
Implementation Method 1
A temperature sensor is positioned downstream of the ignition source and is configured to determine temperature of air in fluid communication with the chamber at the drum
Implementation Method 2
an ignition source configured to ignite gaseous fuel for heating air provided to the chamber for drying laundry articles
Data Source
AI summary
A dryer appliance and method for operation are provided, the method including measuring temperature of air for drying laundry articles; transmitting a first control signal for operating the ignition source to generate heat for heating air for drying laundry articles; measuring, over a period of time following transmission of the control signal, temperature of air for drying laundry articles; and determining an operational state of the heating system based on measuring the temperature of air, wherein the operational state includes a normal ignition state or an ignition failure state, wherein the normal ignition state corresponds to an increase in temperature of air during the period of time, and wherein the ignition failure state corresponds to a substantially unchanged temperature of air.