Engine Control Using Mass Fraction Burned Data Correlation
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Solution Overview
Problem
Existing control systems for internal combustion engines rely on limited data points to assess combustion state and environment, leading to inaccurate identification of changes in combustion conditions, and existing methods for generating reference data for mass fraction burned are complex and computationally intensive, making them unsuitable for real-time engine control.
Innovation Solution
A control apparatus that uses an in-cylinder pressure sensor and crank angle sensor to calculate mass fraction burned data, generates reference data through linear interpolation and extrapolation based on specified fraction combustion points, and executes engine control based on the correlation between measured and reference data to adapt to changes in combustion conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple operating condition parameters are used to generate reference data for mass fraction burned, then the accuracy of combustion evaluation is improved, but the calculation load increases significantly
Solution Approach 1:
The patent extracts only the essential parameters (intake air flow rate, engine speed, fuel injection amount, EGR rate) from the multitude of possible operating condition parameters. By selecting and using only these key parameters to generate reference data through the Wiebe function, the system achieves accurate combustion evaluation while significantly reducing the calculation load compared to using all possible parameters.
Solution Approach 2:
The patent changes the approach from using multiple complex parameters to using a standardized set of five key parameters. This parameter transformation allows the system to maintain measurement precision for combustion evaluation while reducing computational complexity through the use of the Wiebe function with limited parameters.
2Measurement precision
If data for mass fraction burned is generated using complex methods, then the accuracy is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent simplifies the data generation process by transforming complex combustion data into a standardized format using the Wiebe function with five key parameters. This parameter transformation makes the system easier to operate while maintaining accuracy, as the standardized parameters and function provide a clear, manageable approach to generating reference data.
3Device complexity
If only two specified fraction combustion points are used to compare combustion states, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The patent segments the combustion analysis into distinct phases by using multiple specified fraction combustion points (CA10, CA50, CA80) instead of just two points. This segmentation allows for more precise identification of combustion state changes at different stages of the combustion cycle, improving measurement precision while maintaining manageable system complexity through structured analysis.
Data Source
AI summary
A control apparatus for an internal combustion engine is configured to: calculate measured data for MFB in synchrony with crank angle based on in-cylinder pressure detected by an in-cylinder pressure sensor; execute SA-CA10 feedback control and CA50 feedback control based on a measured CA10 and a measured CA50 that are calculated based on the measured data; execute engine control based on a degree of correlation between the MFB measured data and the reference data that corresponds thereto; and generate reference data for a combustion period by linear interpolation and linear extrapolation based on a target CA50 and a specified CA10.