Engine Ignition Control Device for Kickback Prevention
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Solution Overview
Problem
Engine start-up using human power faces challenges with ignition combustion kickback, which compromises startability and rotational speed, especially when a large delaying angle is set to prevent kickback, leading to weaker rotational torque and increased failure probability.
Innovation Solution
An engine ignition control device that detects the start-up rotation angle and switches control specifics to provide a kickback-preventive effect while maintaining startability, by delaying ignition or stopping ignition when necessary, with a set angle determining the level of kickback prevention based on the applied operation force, allowing high start-up torque and rotational speed increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large delaying angle amount of the ignition position is set to obtain a consistent large kickback-preventive effect, then the occurrence of ignition combustion kickback is suppressed, but the rotational torque (start-up torque) of the engine becomes weaker and the rotational speed cannot be increased to the idling rotational speed
Solution Approach 1:
The patent applies dynamics by making the ignition control strategy changeable based on operating conditions. The ECU dynamically selects between different ignition control modes (kickback prevention mode with large delaying angle, normal mode with small delaying angle, or stop ignition mode) based on real-time detection of rotational speed and determination of kickback risk, allowing the system to adapt its ignition timing strategy to current engine state rather than using a fixed delaying angle
Solution Approach 2:
The patent changes the ignition timing parameter (delaying angle) based on detected rotational speed and kickback risk assessment. When rotational speed is low and kickback risk is high, a large delaying angle is applied to prevent kickback. When rotational speed increases or kickback risk is low, the delaying angle is reduced or ignition is stopped, thereby optimizing start-up torque while preventing kickback under critical conditions
2Object-affected harmful factors
If a large delaying angle amount of the ignition position is set to obtain a consistent large kickback-preventive effect, then the occurrence of ignition combustion kickback is suppressed, but there is a high probability of failure in engine start-up
Solution Approach 1:
The system dynamically adjusts ignition control strategy based on real-time rotational speed detection and kickback risk determination. The ECU transitions between different control modes (kickback prevention, normal control, stop ignition) as the engine state changes during start-up, ensuring reliable start-up by adapting to the evolving mechanical conditions rather than applying a static control strategy
Solution Approach 2:
The ignition timing parameter is changed based on detected conditions: when rotational speed is low and kickback risk is high, large delaying angle is applied; when rotational speed increases or kickback risk decreases, the delaying angle is reduced or ignition is stopped. This conditional parameter adjustment ensures kickback prevention when necessary while maintaining start-up reliability under favorable conditions
Data Source
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AI summary
An engine ignition control device comprising: a start-up ignition controller having a function for preventing the occurrence of kickback by either delaying an ignition position of an engine or stopping ignition; start-up rotation angle detection means for detecting a rotation angle of a crankshaft of the engine after initiation of a start-up operation of the engine; and switching means for switching control specifics of the start-up ignition controller in accordance with the detected start-up rotation angle so that when the detected start-up rotation angle is less than a set angle, there is created a kickback-preventive effect within a range at which engine startability is not compromised, and when the detected start-up rotation angle is equal to or greater than the set angle, there is created a kickback-preventive effect that is greater than the kickback-preventive effect for when the start-up rotation angle is equal to or less than the set angle.