Internal Combustion Engine Combustion Detection Using Fourier Analysis
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Solution Overview
Problem
Existing methods for determining if a combustion process is occurring in an internal combustion engine lack precision and require additional sensor equipment, making them inefficient and costly.
Innovation Solution
A method utilizing existing sensor equipment to analyze kinetic energy from rotational movement and piston motion, combined with volume work of cylinder gases, and employing a characteristic Fourier component signature to determine if a combustion process is happening, specifically by identifying phase shifts around a fixed crankshaft angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods are used to determine combustion process occurrence, then the system can detect if the engine is running, but the precision is insufficient for detecting individual combustion processes
Solution Approach 1:
The method utilizes existing engine sensors (crankshaft angle sensor, piston position sensors) to detect combustion processes, making the system self-sufficient without requiring additional specialized sensors. The control device processes signals from already-present sensors to determine combustion occurrence, thereby avoiding increased device complexity while improving measurement precision
Solution Approach 2:
The invention replaces potential mechanical/additional sensor systems with a signal processing approach using Fourier analysis of existing sensor data. By analyzing the characteristic signature in the frequency domain of signals from existing sensors, the system achieves precise combustion detection without mechanical additions
2Measurement precision
If additional sensor equipment is used to improve combustion detection precision, then measurement precision improves, but the outlay and device complexity increase
Solution Approach 1:
Existing engine sensors are made multi-functional: they serve both their original purposes (engine operation monitoring) and the new function of detecting individual combustion processes. The crankshaft angle sensor and piston position sensors provide data for both general engine control and specific combustion event detection, eliminating the need for additional sensor purchases and installations
Solution Approach 2:
The system uses its own existing sensor infrastructure to achieve enhanced combustion detection capabilities, making the engine control system self-sufficient and avoiding external dependencies on additional expensive sensor equipment
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
This method provides precise detection of combustion processes with minimal additional outlay, using existing engine sensors, allowing for accurate engine control and operation.
Implementation Method 1
employing a characteristic Fourier component signature to determine if a combustion process is happening, specifically by identifying phase shifts around a fixed crankshaft angle
Data Source
AI summary
A method for ascertaining whether a combustion process is being carried out in a cylinder of an internal combustion engine, it being decided whether or not the combustion process is present as a function of a relative angle between a characteristic signature of a variable characterizing a time curve of a state variable of the internal combustion engine and a specifiable crankshaft angle.