Ignition Coil Voltage Boost for Low RPM Spark Generation
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Solution Overview
Problem
Existing ignition systems for internal combustion engines struggle to generate sparks at low RPMs, especially when battery power is depleted or in cold temperatures, requiring larger batteries or physical effort for rope pull starters, which are inconvenient for elderly or those with physical limitations.
Innovation Solution
A system that includes a controller and battery pack with a switching device to provide a voltage boost to the primary winding of the ignition coil, creating a voltage pulse to enhance spark generation even at low RPMs, using a microcontroller or analog timing circuit to optimize the timing of the voltage pulse for efficient spark creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery-powered starter motor is used to rotate the flywheel at high speed to generate sparks, then reliable spark generation is achieved, but the battery size must be increased to maintain sufficient charge in cold temperatures or after depletion
Solution Approach 1:
The system performs preliminary action by detecting low RPM conditions and proactively applying a voltage boost pulse to the ignition coil before the engine can generate sufficient voltage on its own. This prevents spark generation failure in low-RPM scenarios without requiring a larger battery, as the boost is only applied when needed rather than continuously.
Solution Approach 2:
The system changes the voltage parameter dynamically by detecting RPM conditions and adjusting the primary coil voltage accordingly. When RPM falls below the threshold, the controller increases the voltage to the ignition coil through the switching device, enabling spark generation at low speeds without requiring the battery to continuously operate at high capacity.
2Weight of stationary object
If a rope pull recoil starter is used to rotate the flywheel without a battery, then battery size is reduced, but physical effort is required which is inconvenient for elderly or those with physical limitations
Solution Approach 1:
The system enables self-service by using the engine's own rotation (even at low RPM) to trigger the voltage boost mechanism. The controller detects the low-RPM condition and automatically applies the necessary voltage enhancement without requiring external physical effort from the operator, making the system convenient for elderly or physically limited users while maintaining a compact battery.
3Reliability
If the starter motor rotates the flywheel at high speed to induce sufficient current for sparks, then spark generation is reliable, but the system fails when battery charge is depleted or in cold temperatures
Solution Approach 1:
The system dynamically adapts to varying operating conditions by continuously monitoring RPM and adjusting the ignition voltage in real-time. The controller responds to changing conditions (low RPM, cold temperature, depleted battery) by applying voltage boosts only when necessary, allowing the system to maintain spark reliability across a wide range of operating conditions without requiring a oversized battery designed for worst-case scenarios.
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
Enables reliable spark generation at low RPMs, reducing the need for high-speed rotation and allowing smaller battery packs, improving starting efficiency and convenience by ensuring engine ignition without excessive physical effort or large battery sizes.
Implementation Method 1
The system includes an electric storage device, such as a plurality of battery cells located in a battery pack, which is designed to store an electrical charge. When the controller senses the beginning of the starting procedure and senses that the flywheel is rotating at a speed lower than a threshold rotational speed, the controller operates a switching device to move the switching device into a first condition for a pulse period. When the switching device is in the first condition, the electrical storage battery is allowed to discharge through the primary winding of the internal combustion engine. The discharge of the electrical storage device through the primary winding creates a voltage pulse across the primary winding, which in turn induces the flow of current in the secondary winding of the internal combustion engine.
Implementation Method 2
the starter motor rotates a flywheel of the internal combustion engine at a speed sufficient to induce an amount of current applied to the primary coil, which is abruptly terminated upon further rotation, resulting in a voltage spike that is able to jump the spark plug gap to generate a spark within the engine
Data Source
AI summary
A system and method for enhancing spark generation in an ignition coil of an internal combustion engine at low rotational speeds of the flywheel. The method and system monitor the rotational speed of the flywheel and, when the rotational speed of the flywheel is below a threshold rotational speed, the system and method supplies voltage pulses to the primary winding. The timing of the voltage pulses supplied to the primary winding are triggered off of voltage transitions in pulses induced in the primary winding upon rotation of the flywheel. Once the internal combustion engine has started, the switching device transitions into a second condition to disconnect the electrical storage device from the primary winding. The spark generation system of the present disclosure allows for starting of an internal combustion engine upon slower initial rotational speeds.