Gas Stepper Valve Ignition Ramp Control Using Ionization Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for controlling ignition in electronic gas-air mixtures in heating devices face issues such as strong backfires and potential damage due to component tolerances and gas composition fluctuations, without addressing these factors effectively.
Innovation Solution
A method for adjusting the ignition ramp function by determining the opening position of a gas stepper motor valve, monitoring ionization current, and adapting the ignition ramp function based on a defined limit value to ensure safe ignition, without requiring additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed ignition ramp function is used with electronic gas-air mixture, then the ignition process follows a predetermined sequence, but component tolerances and gas composition fluctuations cause ignition at the limit with strong backfires
Solution Approach 1:
The patent applies feedback by continuously monitoring the ionization current during the ignition ramp phase and using this information to dynamically adjust the gas valve opening position. The control unit compares the measured ionization current against expected values and modifies the gas flow accordingly, creating a closed-loop control system that adapts to actual combustion conditions rather than following a fixed predetermined sequence.
Solution Approach 2:
The patent transforms the static, fixed ignition ramp function into a dynamic control process. The gas valve opening position is no longer predetermined but is continuously adjusted during the ignition phase based on real-time ionization current measurements. This dynamic adaptation allows the system to respond to variations in component tolerances and gas composition, preventing ignition at the limit and associated backfires.
2Reliability
If gas flow is increased to ensure reliable ignition, then ignition reliability improves, but the risk of strong backfires and damage increases
Solution Approach 1:
The system uses ionization current feedback to precisely control the optimal gas flow level during ignition. By monitoring the ionization current in real-time, the control unit can determine the exact moment when sufficient gas accumulation has occurred for reliable ignition, adjusting the gas valve opening position to maintain optimal flow without excessive gas accumulation that would cause backfires.
Solution Approach 2:
The patent dynamically changes the gas flow parameter during the ignition phase based on measured ionization current. Instead of using a fixed high gas flow rate, the system continuously adjusts the gas valve opening position to optimize the gas flow rate, maintaining it at the precise level needed for reliable ignition while preventing excessive flow that would lead to backfires.
3Measurement precision
If additional components like gas mass sensors are added to improve ignition control, then measurement precision improves, but device complexity increases significantly
Solution Approach 1:
The patent makes the ionization electrode multi-functional by using it for both its traditional purpose (detecting flame presence) and as a sensor for measuring ionization current during the ignition ramp phase. This eliminates the need for separate gas flow measurement devices while providing the necessary measurement precision for adaptive ignition control.
Solution Approach 2:
The system uses existing components (ionization electrode, control unit, gas valve) to perform the additional function of adaptive ignition control. The ionization electrode naturally generates the ionization current signal during normal operation, and the control unit already processes this signal for flame detection, so no additional measurement infrastructure is needed - the system serves itself by utilizing its existing capabilities for dual purposes.
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
Ensures a reliable and safe ignition process by continuously adapting to component tolerances and gas composition changes, preventing backfires and maintaining operational robustness.
Implementation Method 1
combustion is monitored by an ionization electrode. By measuring the electrical conductivity of the flame, the combustion quality can be assessed
Data Source
Figure 1~2
Figure 3~4
AI summary
A method for operating a heating appliance (1) with an electronic gas-air mixture is proposed, comprising at least the following steps to be performed during heating operation: a) determining the opening position of a gas stepper motor valve (31) via an ignition ramp function; b) detecting the ionization current of a flame (4) of the heating appliance (1); c) detecting the opening position of the gas stepper motor valve (31) upon reaching a defined limit value of the ionization current; d) adjusting the ignition ramp function to open the gas stepper motor valve (31) by taking into account the position of the gas stepper motor valve (31) detected in step c). The method allows the ignition ramp function of a heating appliance (1) to be adapted to the tolerances of the gas stepper motor valve (31) and environmental variables, thereby ensuring increased operational reliability during ignition of the heating appliance (1).