Ignition Control Device with Timing Retard Circuit for Safe Engine Shutdown
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Solution Overview
Problem
Existing ignition control devices for micro engines, such as those used in trimmers, face issues with complex manufacturing, unstable quality, high cost, and safety concerns due to the direct grounding of the ignition circuit module when the killing switch is activated, leading to potential reactivation at low engine speeds.
Innovation Solution
An ignition control device with a killing control device that includes a timing retard circuit module and a diode to protect the transistor, allowing for immediate cessation of ignition voltage output and incorporating a diode to improve interference resistance, enabling safe and reliable engine shutdown with adjustable timing based on engine speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the killing switch directly grounds the ignition circuit module, then the ignition stops immediately, but the engine may reactivate at low speeds causing safety issues
Solution Approach 1:
The patent applies preliminary action by introducing a timing retard circuit that delays the grounding of the ignition circuit module after the killing switch is activated. This delay ensures the engine has fully stopped before ignition is cut off, preventing reactivation at low speeds. The capacitor in the timing circuit charges during engine operation and discharges to delay grounding, creating a safety buffer period.
Solution Approach 2:
The patent uses a capacitor as an intermediary element in the killing control circuit. The capacitor acts as a timing element that mediates between the killing switch and the ignition circuit module, controlling the timing of the grounding action. This intermediary component simplifies the overall control logic while ensuring safe shutdown sequencing.
2Reliability
If the killing control device uses a killing coil to send signals, then the control function is achieved, but the manufacture becomes complicated and cost increases
Solution Approach 1:
The patent extracts and eliminates the killing coil component from the traditional ignition control system. Instead of using a separate killing coil to send shutdown signals, the invention integrates the killing control function directly into the existing ignition circuit through the timing retard circuit and killing switch, thereby simplifying manufacturing while maintaining control reliability.
Solution Approach 2:
The patent applies multi-functionality by making the ignition circuit module serve dual purposes: normal ignition operation and killing control signal reception. The ignition circuit module processes both standard ignition signals and killing control signals through its existing transistor and capacitor network, eliminating the need for dedicated killing coil hardware.
3Speed
If the ignition circuit module power is shortened directly, then the shutdown response is fast, but the engine speed may be too low causing reactivation danger
Solution Approach 1:
The timing retard circuit performs preliminary action by preparing the circuit state before complete shutdown. The capacitor charges during engine operation and provides a delayed discharge path that maintains ignition capability until the engine has sufficiently decelerated, ensuring safe shutdown timing while maintaining fast response capability.
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 solution simplifies manufacturing, reduces costs, ensures safe engine shutdown, and allows for automatic recovery to a ready-to-start state, providing stable and reliable operation with improved safety and reduced reactivation risks.
Implementation Method 1
The coil produces a voltage driving the ignition circuit module of the ignition control device by induction after the coil cutting the magnetic lines of force
Data Source
AI summary
The invention provides an ignition control device and a killing control device correspond. An ignition control device comprises an ignition circuit module and a killing control device corresponds. The ignition circuit module comprises a killing control device including a killing switch and a timing retard circuit module connected to the ignition circuit module. When the killing control operates, the ignition circuit stops igniting. The invention has following advantages: reasonable structure, low cost, stable control circuit and safe operation and so on.