Effect of Cycle-to-cycle Combustion Fluctuation on In-Cylinder and Exhaust THC Measured by Fast-FID in Super-Lean Burn Spark Ignition Engine
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- Publication code
- 20264525
- Paper/Info type
- International Journal of Automotive Engineering
Vol.17 No.3
- Pages
- 96-105(Total 10 p)
- Date of publication
- Jul 2026
- Publisher
- JSAE
- Language
- English
Detailed Information
| Category(E) | Research paper |
|---|---|
| Author(E) | 1) Yuji Tagaya, 2) Tsuyoshi Nagasawa, 3) Hidenori Kosaka |
| Affiliation(E) | 1) Institute of Science Tokyo, 2) Institute of Science Tokyo, 3) Institute of Science Tokyo |
| Abstract(E) | For further improvement of thermal efficiency in super-lean burn spark ignition (SI) engine by reducing unburned loss, it is important to clarify unburnt hydrocarbon emission mechanism. In this study, time-resolved total hydrocarbon (THC) mole fraction measurement by a fast response flame ionization detector (FFID) was conducted in super-lean burn single cylinder SI engine with port fuel injection, Gas sampling probes were mounted at about 47 mm (upstream measurement position) and 209 mm (downstream measurement position) downstream from the exhaust valve. This study investigated the relationship between THC emissions and combustion characteristics in each cycle of a super-lean burn spark ignition engine, in order to clarify the mechanism of unburned hydrocarbon (UHC) formation and emissions. The THC in the cylinder were measured by placing the tip of the FFID probe at two locations with the distances from wall surface of 0 mm and 5 mm. The results showed that the THC mole fraction at 5 mm from the wall was strongly affected by CA90, while the effect of CA90 on THC was weak at 0mm from the wall. Furthermore, the measured THC in exhaust pipe only in stable combustion cycles were extracted and related with the operation conditions of the engine. Even by excluding the measured data of misfire cycles, the results showed THC emissions in each cycle increase with the increase in excess air ratio between 1.0 and 2.0. |
