Engine Ignition Timing Control for Kickback Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing internal combustion engines face challenges in preventing kickback, particularly during starting, which can lead to reverse rotating torque and damage to components, and current countermeasures like torque limiters increase cost and weight, while also causing unnatural riding experiences when ignition is stopped to prevent kickback.
Innovation Solution
An internal combustion engine with an electronic ignition timing control system that calculates the reduction in rotational speed using pulse signals to determine if kickback will occur, and adjusts the ignition timing to either perform a hard ignition or a delayed ignition, thereby preventing kickback without the need for torque limiters or ignition stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torque limiter or other suitable device is used to prevent damage from reverse rotating torque during kickback, then component reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical protective devices (torque limiters) with an electronic control system that monitors engine parameters and adjusts ignition timing to prevent kickback. The ECU calculates rotational speed reduction amounts and controls ignition timing dynamically, eliminating the need for mechanical torque limiting components while maintaining reliability.
Solution Approach 2:
The system performs preliminary detection of kickback conditions by monitoring rotational speed changes before actual kickback occurs. The ECU calculates the reduction amount of rotational speed and predicts potential kickback, adjusting ignition timing in advance to prevent the harmful reverse torque from developing.
2Reliability
If ignition is stopped to prevent kickback, then kickback is prevented, but riding experience deteriorates due to unnatural behavior
Solution Approach 1:
Instead of stopping ignition completely, the system dynamically adjusts ignition timing based on real-time engine conditions. The ECU calculates rotational speed reduction and modifies ignition timing angles continuously, allowing the engine to operate smoothly while preventing kickback conditions. This dynamic control maintains natural riding experience while ensuring reliability.
Solution Approach 2:
The patent changes the ignition timing parameter dynamically based on detected rotational speed changes. Rather than a binary on/off control, the system adjusts the timing angle continuously according to the calculated reduction amount, maintaining engine operability and natural rider experience while preventing kickback.
3Device complexity
If traditional ignition timing control is used without considering rotational speed reduction, then device complexity is reduced, but kickback occurs during certain operating conditions
Solution Approach 1:
The system implements feedback control by continuously monitoring engine rotational speed and using this information to adjust ignition timing. The ECU receives pulser signals, calculates rotational speed and its reduction amount, and uses this feedback to dynamically control ignition timing, preventing kickback while maintaining operational reliability across all conditions.
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
Effectively prevents kickback in all rotation regions without the use of countermeasures like torque limiters, reducing cost and weight, and ensures a smooth riding experience by adjusting ignition timing based on rotational speed calculations.
Implementation Method 1
an ignition timing control system for calculating a reduction amount of a rotational speed of the internal combustion engine by a plurality of pulse signals immediately before performing an ignition
Implementation Method 2
an ignition apparatus which is connected to the control apparatus and the ignition timing of which is controlled by the control apparatus
Data Source
AI summary
An internal combustion engine performs an ignition timing control by an electronic control in accordance with a pulse signal from a pulser. The pulser generates a plurality of the pulser signals per one rotation of the internal combustion engine. An ignition timing control system calculates a reduction amount of a rotational speed of the internal combustion engine based on a plurality of the pulse signals immediately before performing an ignition in the internal combustion engine to determine whether the reduction amount produces ignition combustion kickback and performs a hard ignition or an ignition at an angle which is delayed more than the hard ignition.