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Combustion process in a spark ignition engine: dynamics and noise level estimation.

T Kaminski¹, M Wendeker, K Urbanowicz

¹Department of Combustion Engines, Technical University of Lublin, Nadbystrzycka 36, PL-20-618 Lublin, Poland.

Chaos (Woodbury, N.Y.)

|June 11, 2004

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Researchers studied internal pressure in a spark ignition engine, observing long-term oscillations. They found that increasing spark advance angle makes the combustion process more deterministic and less noisy.

Area of Science:

Thermodynamics and Combustion Science
Mechanical Engineering
Nonlinear Dynamics

Background:

Internal combustion engines exhibit complex pressure dynamics.
Cyclic variations and longer-term oscillations can impact engine performance and efficiency.
Understanding these dynamics is crucial for optimizing engine control and reducing emissions.

Purpose of the Study:

To analyze the experimental time series of internal pressure in a four-cylinder spark ignition engine.
To investigate the influence of spark advance angle on pressure oscillations and combustion noise.
To quantify the deterministic nature of the internal combustion process.

Main Methods:

Experimental measurement of internal pressure time series across various spark advance angles.

Related Experiment Videos

Calculation of heat released per combustion cycle based on pressure data.

Estimation of noise level using correlation coarse-grained entropy from the heat release time series.

Main Results:

Observed long-timescale oscillations (1-100s of cycles) in internal pressure beyond normal cyclic variations.
Heat release per cycle was calculated from the pressure time dependence.
A larger spark advance angle resulted in a more deterministic internal combustion process, indicating reduced noise.

Conclusions:

The internal combustion process in spark ignition engines exhibits complex dynamics, including long-term oscillations.
Spark advance angle is a critical parameter influencing the deterministic behavior and noise level of combustion.
Increased spark advance leads to a more predictable and less noisy combustion process.