HCCI Combustion Stability Monitoring via IMEP Deviation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for monitoring combustion stability in internal combustion engines, particularly for HCCI engines, are impractical for online calculation and require extensive data collection and storage, making them unsuitable for real-time monitoring and quick response to instability.
Innovation Solution
A method that determines the absolute deviation of indicated mean effective pressure or torque from set points and compares it with predetermined thresholds to assess combustion stability, allowing for online monitoring and feedback control to stabilize combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional combustion stability monitoring methods are used, then measurement precision is improved, but device complexity and data processing requirements increase significantly
Solution Approach 1:
The patent extracts only the essential parameter (indicated mean effective pressure) needed for combustion stability monitoring from the complex set of available engine data. By focusing on this single key parameter rather than collecting and analyzing multiple parameters, the system achieves accurate combustion stability measurement while significantly reducing device complexity and data processing requirements.
2Measurement precision
If extensive data collection and storage is implemented, then measurement precision is improved, but productivity and real-time monitoring capability deteriorate
Solution Approach 1:
The invention extracts and monitors only the indicated mean effective pressure parameter, eliminating the need to collect, store, and process extensive sets of data. This extraction approach enables real-time combustion stability monitoring with immediate feedback capability, significantly improving productivity and response time while maintaining measurement precision.
Solution Approach 2:
The system uses the engine's existing operational parameters (indicated mean effective pressure) that are already available from normal engine operation. By leveraging data that is naturally generated during engine operation rather than requiring additional sensors and data collection infrastructure, the system achieves real-time monitoring capability without compromising productivity.
3Measurement precision
If multiple parameters are monitored for combustion stability, then measurement precision is improved, but ease of operation and response time worsen
Solution Approach 1:
The patent identifies and extracts the single most critical parameter (indicated mean effective pressure) that directly reflects combustion stability. This extraction simplifies the monitoring system to track only one key parameter, making the system easier to operate and interpret while maintaining accurate combustion stability assessment. The simplified approach enables operators to quickly respond to combustion instability without navigating complex multi-parameter data.
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
Enables real-time monitoring and stabilization of combustion, reducing misfiring and emissions by adjusting operating conditions such as burnt mass fraction and intake air charge temperature, improving engine performance and meeting stringent emissions standards.
Implementation Method 1
detecting a rotational speed of the crankshaft with a crankshaft rotational speed sensor
Implementation Method 2
combustion stability of an internal combustion engine
Data Source
AI summary
The present invention relates to a method for monitoring combustion stability of an HCCI internal combustion engine equipped with a crankshaft, an intake manifold and at least one cylinder, wherein stability is determined based on a deviation of an engine operating parameter such as, for example engine load or engine speed, from a predetermined threshold.