Abstract
Biodiesel as a clean energy source could reduce environmental pollution compared to fossil fuel, so it is becoming increasingly important. In this study, we investigated the effects of different pilot injection timings from before top dead center (BTDC) and exhaust gas recirculation (EGR) on combustion, engine performance, and exhaust emission characteristics in a common rail diesel engine fueled with canola oil biodiesel-diesel (BD) blend. The pilot injection timing and EGR rate were changed at an engine speed of 2000 rpm fueled with BD20 (20 vol % canola oil and 80 vol % diesel fuel blend). As the injection timing advanced, the combustion pressure, brake specific fuel consumption (BSFC), and peak combustion pressure (Pmax) changed slightly. Carbon monoxide (CO) and particulate matter (PM) emissions clearly decreased at BTDC 20° compared with BTDC 5°, but nitrogen oxide (NOx) emissions increased slightly. With an increasing EGR rate, the combustion pressure and indicated mean effective pressure (IMEP) decreased slightly at BTDC 20° compared to other injection timings. However, the Pmax showed a remarkable decrease. The BSFC and PM emissions increased slightly, but the NOx emission decreased considerably.
Highlights
Economic growth and a drastic increase in the number of motor vehicles are causing environmental pollution and an energy shortage
In the present study, we experimentally investigated the effects of pilot injection timing and exhaust gas recirculation (EGR) rate on the combustion and exhaust emissions characteristics from burning BD20 in a common rail diesel engine at an engine speed of 2000 rpm
A constant load of 30 Nm torque from the engine dynamometer was applied to the test engine at each pilot injection timing to ensure consistent test conditions when the main injection timing was fixed at top dead center (TDC) 0°
Summary
Economic growth and a drastic increase in the number of motor vehicles are causing environmental pollution and an energy shortage. Environmental pollution and energy shortages are two main factors restricting the development of the diesel engine industry. Biodiesel has been a hot topic because of its environment-friendly characteristics and renewability [4,5]. Biofuels such as alcohols and biodiesel have been proposed as alternatives to fossil fuels for internal combustion engines. Biodiesels derived from vegetable oils have received wide attention as a replacement for diesel fuel because they emit fewer GHG and other pollutant emissions [6,7,8]
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