Abstract
In this paper, an experimental study evaluating the effect of exhaust gas recirculation (EGR) and liquefied petroleum gas (LPG) onboard systems attached to a single cylinder DI diesel engine running with diesel is presented. Tests were performed at the minimum (1400 rpm) and maximum engine speeds (4100 rpm). The engine were tested under four different operating modes mainly; (a) standard test condition, (b) engine with EGR system, (c) engine with LPG system and (d) the engine with EGR and LPG onboard systems. Parameters that been measured during the tests are percentage of oxygen (O2) content, carbon monoxide (CO) emissions, carbon dioxide (CO2) and unburned hydrocarbon (UHC) emissions. Results show for the exhaust emissions, the engine with LPG onboard system emits higher CO and UHC emissions for both engine speeds. According to the experimental results it can be concluded that the use of EGR system increased the exhaust gas temperature and CO2emissions. While the engine with EGR and LPG onboard systems have influenced much on the increase in CO and UHC emissions for both engine speeds.
Highlights
Exhaust emission from the vehicles are among the main causes that contribute to the air pollution
The lack of oxygen is responsible for reduced oxidation rate, which leads to incomplete combustion, produces higher unburned hydrocarbon (UHC) emissions
Unburned hydrocarbon (UHC), ppm content corresponding to the engine speed (Hydrocarbon) emission content corresponding to the engine speed
Summary
Exhaust emission from the vehicles are among the main causes that contribute to the air pollution. The exhaust gasses were recirculated into the air charge and decreased the cylinder temperature for the NOx reduction This mode has significantly increased the carbon monoxide (CO) and total hydrocarbon (THC) emissions. Psycochemical properties of tested mineral diesel can be referred in [7] while the properties for liquefied petroleum gas (LPG) can be referred to Gas Malaysia [8] In this experimental study, a Robyn DY-23 single cylinder diesel engine was tested under four engine operating modes which are standard (no engine modification), engine with EGR system (exhaust gasses been recirculated into the intake manifold using EGR piping), engine with LPG system (LPG been channeled through the intake manifold, mixing with the fresh air charge) and the engine with combination EGR and LPG systems (EGR and LPG systems been used together). The tests for each different engine condition were conducted five times to assure the reliability and the accuracy of the measured results
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