Engine Misfire Detection Using Pulsation Spectrum for All Cylinders
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Solution Overview
Problem
Existing misfire detecting devices for internal combustion engines with multiple cylinders take time to detect all-cylinder misfires, leading to increased non-combustion gas production, particularly in power generation engines with a large number of cylinders.
Innovation Solution
An internal combustion engine misfire detecting device that frequency-analyzes operation parameter data to acquire pulsating and change rate parameters, determining an all-cylinder misfire based on threshold values of these parameters, allowing for rapid detection without individual cylinder assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual cylinder misfire detection is performed for each of the plurality of cylinders, then misfire detection accuracy is improved, but detection time increases and non-combustion gas accumulation increases
Solution Approach 1:
The patent combines the detection of multiple cylinders into a single integrated detection approach. Instead of individually analyzing each cylinder's misfire condition, the system aggregates the misfire detection across all cylinders and determines all-cylinder misfire based on the combined state, thereby reducing detection time while maintaining accuracy.
Solution Approach 2:
The patent segments the detection process into two stages: first detecting misfires in individual cylinders, then aggregating these results to determine all-cylinder misfire. This segmentation allows the system to maintain individual cylinder detection capability while implementing a more efficient overall detection strategy that reduces total detection time.
2Measurement precision
If individual cylinder misfire detection is performed for each of the plurality of cylinders, then misfire detection accuracy is improved, but non-combustion gas generation increases
Solution Approach 1:
The patent merges the detection approach by determining all-cylinder misfire based on aggregated detection results rather than processing each cylinder separately. This combining approach reduces the total detection time, which directly reduces the duration during which non-combustion gas is generated, thereby reducing the harmful effect while maintaining detection accuracy.
Solution Approach 2:
The system performs preliminary detection of misfires in individual cylinders and then quickly aggregates these results to determine all-cylinder misfire. This preliminary action allows the system to identify all-cylinder misfire conditions faster, reducing the time window for non-combustion gas generation before intervention can be applied.
3Reliability
If traditional misfire detection methods are used, then detection reliability is maintained, but detection speed decreases in engines with large number of cylinders
Solution Approach 1:
The patent merges the detection process by determining all-cylinder misfire based on aggregated detection results from all cylinders. This combining approach maintains detection reliability by still considering individual cylinder misfire conditions while significantly improving detection speed by avoiding the need to process each cylinder independently in sequence.
Solution Approach 2:
The patent implements a dynamic detection strategy that adapts to the number of cylinders in the engine. Instead of using a fixed sequential detection process that scales linearly with the number of cylinders, the system uses an aggregated approach that maintains constant detection time regardless of engine size, thereby improving detection speed while preserving reliability.
Data Source
AI summary
A misfire detecting device for an internal combustion engine, having a plurality of cylinders is provided with: a pulsation component acquiring unit for performing a frequency analysis of operating parameter data indicating a change over time in an operating parameter correlated with an overall operating state of the plurality of cylinders, and for acquiring a pulsation component spectrum, which is a frequency spectrum of pulsations of the internal combustion engine; a difference parameter acquiring unit for acquiring a difference parameter correlated with a degree of difference between the operations of each of the plurality of cylinders; and all-cylinder misfire determining unit for determining that an all-cylinder misfire has occurred in the internal combustion engine if the pulsation component spectrum acquired by the pulsation component acquiring unit falls below a first threshold and the difference parameter acquired by the difference parameter acquiring unit 12 falls below a second threshold.