Ignition Control Device for Light Duty Gasoline Engine
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Solution Overview
Problem
Light duty gasoline engines face inefficiencies due to delayed ignition signals and potential reverse rotation during startup, leading to reduced work efficiency and risk of damage to the startup system.
Innovation Solution
An ignition control device that uses a charge coil, transformer, position sensing circuit, and micro-controller to generate an ignition signal at the optimal time based on engine speed, preventing reverse rotation by controlling the spark plug's ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the igniter generates the ignition signal at Top Dead Center (TDC), then the ignition timing is simple to control, but the time interval between full burn and TDC becomes bigger with growing rotation speed, reducing work efficiency
Solution Approach 1:
The ignition timing is made dynamic by adjusting the ignition advance angle according to engine rotation speed. The micro-controller calculates the optimal ignition timing based on detected rotation speed, allowing the ignition moment to advance before TDC at higher speeds, thus maintaining efficient combustion while adapting to varying operational conditions.
2Adaptability or versatility
If the engine rotates reversely during startup, then the startup wheel follows the reverse rotation, but the startup rope becomes tighter and may break, causing damage to the startup system
Solution Approach 1:
The position sensing circuit detects the rotation direction before significant reverse rotation occurs. When reverse rotation is detected, the micro-controller immediately stops generating ignition signals, preventing the engine from continuing to rotate reversely and protecting the startup rope from breaking due to excessive tension.
Solution Approach 2:
The position sensing circuit provides real-time feedback on rotation direction to the micro-controller. This feedback mechanism allows the system to monitor and respond to reverse rotation conditions, adjusting ignition timing accordingly to prevent damage to the startup system.
3Productivity
If the rotation speed varies during startup, then the engine can be started, but the ignition angle calculated by the ignition system deviates from the actually required angle
Solution Approach 1:
The ignition timing is dynamically adjusted based on the detected rotation speed. The micro-controller calculates the optimal ignition advance angle according to the current speed conditions, ensuring accurate ignition timing despite variations in rotation speed during the startup process.
Solution Approach 2:
The position sensing circuit continuously monitors rotation speed and provides feedback to the micro-controller, which adjusts the ignition timing accordingly. This closed-loop control ensures that the ignition angle remains accurate even as rotation speed varies during startup.
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 efficient combustion by synchronizing the ignition with the engine's speed, preventing reverse rotation and reducing the risk of damage to the startup system, thereby enhancing engine performance and longevity.
Implementation Method 1
a charge coil configured to induce a first alternating current signal with rotation of a fly wheel
Implementation Method 2
a trigger coil configured to induce a second alternating current signal with rotation of said fly wheel
Implementation Method 3
said secondary ignition coil induces a second signal to control said spark plug to generate a spark
Implementation Method 4
control said spark plug to generate a spark
Implementation Method 5
combustion of Fuel-Air Mixture in the cylinder
Data Source
AI summary
An ignition control device and corresponding method are provided for suppressing reverse rotation of the engine during startup process of a light duty gasoline engine, the ignition control device includes: a charge coil, a transformer, an electric-spark-generating control circuit, a trigger coil, a position sensing circuit, and a micro-controller. The position sensing circuit is used to shape the positive signal and negative signal of the second alternating current signal induced by the trigger coil while the fly wheel rotates respectively to generate a first position signal and a second position signal. According to the first position signal and the second position signal, it is determined by the micro-controller whether the engine is in the state of reverse rotation, and if YES, output of the ignition signal is stopped to make engine halt due to absence of reverse power.