APPLICATION OF ION CURRENT MEASUREMENT TO IDENTIFICATION OF COMBUSTION PARAMETERS IN A HOMOGENEOUS CHARGE COMPRESSION IGNITION ENGINE
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Bibliographic record
Abstract
This study examines the application of ion current measurements to the identification of heat release parameters inside the combustion chamber of a homogeneous charge compression ignition (HCCI) engine fuelled with gasoline.HCCI combustion was achieved with the use of exhaust gas trapping.Combustion parameters derived from the in-cylinder pressure and ion current measurements were compared and analysed.Ion current measurements were accomplished using the existing spark plug and a dedicated electronic circuit.The experiments were performed at a variable excess air ratio and a variable amount of trapped residuals.The results showed a good correlation between peak values of the ion current and heat release rate, except for the cases where a fuel-rich mixture was burnt.The computed ion current integral over the volume of the combustion chamber showed a good agreement with the heat released in the combustion chamber, however this parameter was found to be affected by the amount of trapped residuals.Combustion timing characteristic values computed using heat release and ion current were found to be correlated, however the relationship was not linear.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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