Comparison of the Cyclic Variability of an Exhaust Gas Temperature Sensor and In-Cylinder Pressure Measurements
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Bibliographic record
Abstract
This paper presents a concept of an exhaust temperature sensor as a method to monitor cyclic variability of combustion. The goal is to determine if the cycle-to-cycle fluctuations of the sensor can be related to the cyclic variability of combustion as measured by a pressure transducer. Experiments were conducted with a port fuel spark ignition engine at different engine speeds and loads. For each operating point, different spark timing and different excess ratios were used to evaluate the sensitivity of the temperature-based sensor to quantify the cyclic variability of combustion as measured by the Coefficient of Variation (COV). The results demonstrated the sensitivity of the concept to relatively low levels of cyclic variability (circa 1–3% COV of IMEP). At a given speed and load, changes in cyclic variability indicated by in-cylinder pressure measurement were, in general, reproduced by the sensor. The relationship between the cyclic variability indications provided by the two sensors varied as the speed and load were changed.
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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 | 0.000 | 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)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it