Electronic Ignition System for Portable Gasoline Tools
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Solution Overview
Problem
Existing electronic ignition systems for portable gasoline tools face challenges in starting the engine at low rotation speeds due to insufficient ignition voltage, leading to difficulties in operation and user experience.
Innovation Solution
An electronic ignition system for portable gasoline tools that includes a voltage boosting device, a spark plug, a DC power source (preferably a lithium battery), sensing elements for flywheel rotation speed and temperature, and a controller (MCU) to calculate and control ignition voltage and angle, ensuring efficient ignition even at low speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an inductive coil system is used where voltage is proportional to rotation speed, then the system structure is simple, but the ignition voltage is insufficient at low rotation speeds making engine startup difficult
Solution Approach 1:
The patent replaces the traditional mechanical inductive coil system with an electronic ignition system using a DC power source (lithium battery), electronic switch (MOSFET or IGBT), and ignition coil. This substitution allows independent control of ignition voltage from rotation speed, enabling sufficient ignition voltage at low speeds while maintaining system simplicity through electronic control.
Solution Approach 2:
The patent changes the fundamental parameter relationship by using a DC power source with electronic switching to generate ignition voltage, rather than relying on rotation-speed-proportional inductive voltage. The electronic control unit adjusts duty cycle and switching frequency to maintain optimal ignition voltage across different rotation speeds, particularly ensuring sufficient voltage at low speeds for reliable startup.
2Reliability
If a DC power source with electronic switching is used to provide independent ignition voltage control, then ignition reliability at low speed is improved, but the device complexity increases
Solution Approach 1:
The patent integrates multiple functions into the electronic control unit, which manages power management, ignition timing control, and rotation speed sensing. The DC power source serves both as ignition voltage source and as power supply for the control electronics. The ignition coil serves both ignition function and as a transformer for voltage multiplication, reducing the need for separate components.
Solution Approach 2:
The system uses the existing rotation speed signal from the position sensor to automatically adjust ignition parameters without requiring separate manual controls. The electronic control unit self-regulates the duty cycle and switching frequency based on real-time rotation speed feedback, making the system adaptive without adding complex external control mechanisms.
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
The system enables stable and efficient operation of the gasoline engine across varying speeds by precisely controlling ignition angle and energy, facilitating easy startup and improved user experience.
Implementation Method 1
a voltage boosting device; a spark plug connected with an output of the voltage boosting device
Implementation Method 2
at least one sensing element provided on one of the body and the flywheel; at least one position sensor, provided on the other one of the body and the flywheel to obtain a rotation speed of the flywheel through the at least one sensing element
Data Source
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AI summary
A portable gasoline tool and an electronic ignition system thereof, comprising a voltage boosting device and a spark plug (40) connected with an output of the voltage boosting device. The electronic ignition system further comprises a DC power source (70) and a controller electrically connected with the DC power source (70) and connected with the voltage boosting device, the controller controls ignition voltage and an ignition advance angle. The gasoline tool can be started even if the rotation speed is relatively low in the start-up stage and the whole efficiency of the system is improved. When the load of the gasoline engine changes rapidly, the position sensor is used to detect the change of the rotation speed and the ignition angle is adjusted at the appropriate time to make the gasoline engine work stably, resulting in an enhanced user experience.