Publication: Effect of fuel injection strategies and intake air supply control on performance, exhaust emission, and combustion characteristics of diesel engine fuelled with biodiesel fuel
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Date
2023-06-01
Authors
Leong Hau
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Abstract
Split injection strategies were generally agreed to be a promising strategy to achieve simultaneous nitrous oxide (NOx) and soot reduction. The air intake channel of a commercial diesel engine is designed for maximum airflow rate under severe load conditions. At medium load, excessive airflow may contribute to NOx formation. Therefore, air intake restriction with exhaust gas recirculation (EGR) might be a viable option to couple with a split injection scheme when the engine operates in part load. The study comprises of three parts. Firstly, an engine test rig has been built, which consists of a dynamometer, exhaust gas analyser, and an engine coupled with an in-house built electronic fuel injection control unit (ECU). Secondly, the effect of biodiesel blend on engine performance and emission has been studied, and the most desired fuel blend and engine operating condition was used in the next step. Thirdly, the effect of the double and triple split injection with different timing and injection ratio coupled with EGR and intake air throttling has been studied. It has been found that B60 POME blend at 2000rpm and 80 Nm were the optimize mid load engine condition. Where 5050 double split injection with 12CA was the optimize split injection strategies. Intake air throttling has been found to enhance EGR's beneficial impact by driving more exhaust gas via the EGR path. A response surface methodology (RSM) study was performed to optimise air control and split fuel injection strategies to maximise engine performance and minimise exhaust emissions The optimum parameter appears at 12 °CA dwell angle, -4°ATDC SOI timing, 40% intake throttle opening, 6.75% EGR, 800 bar fuel injection pressure, and 50% split injection ratio.