Ignition Timing Controller for Engine Start-Up Resonance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ignition timing controllers for internal combustion engines fail to adequately inhibit resonance and excessive rotation speed racing during engine start-up, as they consistently set ignition timings on the advance angle side, leading to prolonged resonance and inefficient engine speed stabilization.
Innovation Solution
An ignition timing controller that sets a preceding ignition timing further on the delay angle side and a later ignition timing further on the advance angle side, ensuring the peak rotation speed remains below the resonance range and promptly passes through it, while also considering engine temperature to adjust the delay angle and prevent excessive racing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ignition timing is set on the advance angle side to inhibit resonance, then resonance inhibition is improved, but engine rotation speed races excessively and stability deteriorates
Solution Approach 1:
The ignition timing is dynamically adjusted based on the combustion sequence. The first combustion uses advance angle timing to quickly pass through resonance, while subsequent combustions use delay angle timing to prevent excessive speed racing. This dynamic adjustment resolves the contradiction by applying different timing strategies at different stages of engine startup.
Solution Approach 2:
The ignition timing follows a periodic pattern during startup: advance angle for the first combustion, then delay angle for the second and subsequent combustions. This periodic variation in timing strategy allows the engine to quickly overcome resonance initially, then stabilize speed subsequently, resolving the stability issue.
2Stability of the object's composition
If ignition timing is set on the delay angle side to prevent excessive speed racing, then speed stability is improved, but the time to pass through resonance increases and resonance inhibition deteriorates
Solution Approach 1:
The first combustion is intentionally set with advance angle timing as a preliminary action to quickly propel the engine speed through the resonance range before settling into the stable delay angle timing regime. This preliminary advance timing prevents prolonged resonance exposure.
3Object-affected harmful factors
If ignition timing is consistently set on the advance angle side, then resonance is inhibited, but the engine cannot stabilize speed and excessive racing occurs
Solution Approach 1:
The system dynamically switches from advance angle timing to delay angle timing after the first combustion. This dynamic transition optimizes the balance between resonance inhibition and speed stabilization, reducing the time required to achieve stable engine operation.
4Stability of the object's composition
If ignition timing is consistently set on the delay angle side, then excessive speed racing is prevented, but resonance persists longer and vehicle resonance is not adequately inhibited
Solution Approach 1:
The ignition timing employs a periodic pattern where the first combustion uses advance angle timing to quickly traverse the resonance range, minimizing duration. Subsequent combustions use delay angle timing to maintain stability. This periodic alternation resolves the contradiction between quick resonance passage and sustained stability.
Data Source
AI summary
In starting of an internal combustion engine, among a plurality of combustions of the internal combustion engine when it is assumed that an ignition timing is set to a predetermined reference ignition timing, a preceding ignition timing, which is the ignition timing for a preceding combustion through which a peak of a rotation speed of the internal combustion engine is likely to enter a predetermined resonance rotation speed range where resonance of the conveyance dependent on vibration of the internal combustion engine is induced, is set further on a delay angle side than the reference ignition timing, and a later ignition timing, which is the ignition timing for a later combustion after the preceding combustion, is set further on an advance angle side than the set preceding ignition timing so that the peak of the rotation speed of the internal combustion engine exceeds the resonance rotation speed range.