Engine Combustion Modeling via Flame Brush Thickness Dynamics
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Solution Overview
Problem
Current engine combustion models require extensive experimental calibration for each operating condition, limiting their predictive utility and necessitating resource-intensive feedback loops due to the complexity of turbulent flame interactions, which are computationally expensive and not truly predictive.
Innovation Solution
A computer-implemented method and system for engine combustion modeling that calculates transient turbulent flame speed using a 1D nonlinear ordinary differential equation, eliminating the need for hardware-specific calibration by directly determining flame brush thickness dynamics, allowing for accurate prediction of turbulent flame propagation across a wide range of engine conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional turbulent flame models are used, then combustion behavior can be modeled, but extensive experimental calibration is required for each operating condition
Solution Approach 1:
The patent extracts the flame brush thickness dynamics from the complex turbulent flame model and uses it as a separate, manageable component to predict combustion behavior without requiring extensive calibration of the entire turbulent flame model
Solution Approach 2:
The flame brush thickness acts as an intermediary parameter that bridges the gap between simple laminar flame models and complex turbulent flame models, enabling accurate combustion prediction without direct turbulent flame model calibration
2Measurement precision
If detailed turbulent flame interactions are modeled, then combustion accuracy improves, but computational cost increases significantly
Solution Approach 1:
The patent segments the combustion modeling process into distinct components: flame brush thickness dynamics, mass burned fraction calculation, and combustion phasing prediction. This segmentation allows accurate modeling without computing all turbulent flame interactions
Solution Approach 2:
The patent applies partial action by modeling only the essential flame brush thickness dynamics rather than complete turbulent flame interactions, achieving sufficient accuracy for combustion control without excessive computational resources
3Measurement precision
If hardware-specific calibration is performed, then model accuracy for that hardware improves, but model versatility across different engines decreases
Solution Approach 1:
The flame brush thickness dynamics model is designed as a universal approach that can be applied across different engine types and operating conditions without hardware-specific calibration, making the model versatile while maintaining accuracy
Data Source
AI summary
The systems and methods are generally directed to engine combustion modeling of an engine having a combustion chamber. In one embodiment, a method includes determining the thermodynamic state of the engine combustion chamber based on received engine parameters. The laminar flame speeds of the combustible mixture are determined based on tabulated measurement results or from correlations available in the literature. The dynamics of the turbulent flame brush thickness are calculated using a 1D nonlinear ordinary differential equation. The mass fraction burned ratio is found by tracking the motion of a presumed truncated spherical flame front as it propagates through the combustion chamber using the mass continuity equation. One or more engine control calibration efficiency factors are then determined based on the resultant mass fraction burned ratio. One or more efficiency factors control at least one aspect of the engine.