Glow Plug Voltage Switching for Temperature and Reliability Control
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Solution Overview
Problem
Glow plugs in gas turbine engines face reliability issues in extreme temperature conditions and are costly, with existing technologies failing to maintain optimal performance across varying cold and hot environments.
Innovation Solution
A method and system that control the temperature of glow plugs by switching between two voltage levels, VH and VN, causing the glow plug current to oscillate around a threshold, allowing for precise temperature management through monitoring and adjustment of the applied voltage to prevent overheating or underheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a glow plug operates in extreme temperature conditions, then it can ignite the fuel-air mixture, but its reliability decreases due to overheating or underheating
Solution Approach 1:
The patent applies periodic action by switching between two voltage levels (VH and VN) in alternating cycles. The controller periodically transitions from a first voltage level (VH) to a second voltage level (VN) and back, creating oscillating current that prevents the glow plug from exceeding maximum temperature while ensuring sufficient heating for ignition. This periodic voltage switching directly addresses the temperature control issue and improves reliability in extreme conditions.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the voltage level applied to the glow plug based on its temperature state. The controller monitors conditions and switches between voltage parameters (VH and VN) to maintain the glow plug temperature within an optimal range. This parameter adjustment mechanism ensures the glow plug operates reliably across varying temperature conditions without overheating or underheating.
2Reliability
If a constant high voltage is applied to ensure ignition, then the glow plug heats up sufficiently, but it overheats and reduces lifespan
Solution Approach 1:
The patent uses periodic action to alternate between high voltage (VH) for heating and low voltage (VN) for cooling. This cyclic switching prevents continuous overheating that would reduce lifespan, while still providing sufficient high-voltage periods to ensure reliable ignition. The periodic nature of the voltage application directly extends the glow plug's operational life.
Solution Approach 2:
The patent applies preliminary anti-action by introducing a cooling voltage phase (VN) before the glow plug can overheat and suffer damage. The controller proactively switches to the lower voltage level to prevent excessive temperature accumulation, thereby protecting the glow plug from thermal degradation and extending its service life while maintaining ignition capability.
3Ease of operation
If simple voltage control is used, then the system is easy to operate, but it cannot maintain precise temperature management
Solution Approach 1:
The patent implements feedback by continuously monitoring the glow plug's temperature or current state and using this information to adjust the applied voltage. The controller receives feedback about the glow plug condition and dynamically switches between voltage levels (VH and VN) to maintain precise temperature control. This feedback mechanism enables accurate temperature management while keeping the control system relatively simple.
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 approach enhances the reliability and efficiency of glow plugs by maintaining optimal temperature within a controlled range, reducing the risk of overheating or underheating, and extending the lifespan of the glow plugs while minimizing costs.
Implementation Method 1
a glow plug having a body, a glowing end extending from the body, and a connecting end opposite to the glowing end; at least one glow plug power source operatively connected to the connecting end of the glow plug for applying a voltage thereto
Data Source
AI summary
A method for operating a glow plug includes controlling a temperature of the glow plug by switching between applying a voltage VH and applying a voltage VN<VH to the glow plug. Applying the voltage VH and applying the voltage VN causes a glow plug current to oscillate about a glow plug current threshold. The glow plug current threshold is associated with one of the voltage VH and the voltage VN. The method includes monitoring the glow plug current at the one of the voltage VH and the voltage VN.