Improving fuel consumption with lower exhaust emissions give more focused to all car manufactures. A higher engine performance with lower exhaust emissions requires a complete mixing process resulted in ultra-lean high combustion efficiency. Air intake temperature is one of the alternative strategies to improve fuel consumption and reduced exhaust emissions. This is due to the cold air is denser and contain higher oxygen availability. Air intake temperature will affect to the oxygen concentration in the charged air that influence the combustion process through ignition delay and fuel burning rate. The objective of this experiment is to investigate the effects of air intake temperature to the fuel consumption and exhaust emission at variation of engine speeds and constant load by using 1.6L gasoline engine. Air intake temperature was changed from 20 °C to 30 °C. The DaTAQ Pro V2 software was used to measure the engine fuel consumption while gas analyzer (MRU Gas Analyzer) was used to measure the exhaust emission such as Unburned hydrocarbons (UHCs) and carbon monoxide (CO). The results showed that fuel consumption, UHCs and CO emissions increased with the increase of air intake temperature. The increase of air intake temperature resulted in advanced and shorter combustion duration. Higher oxygen concentration at lower air intake temperature leads to the complete mixing process and complete combustion.  Therefore, the experimental results can be concluded that the lower air intake temperature resulted in improved fuel consumption and reduced UHCs and CO emissions.

No abstract

The depletion of fossil fuel resources and environmental pollution are two major crises that are currently faced by mankind. As the solution for the crises, an additive liquid like Tripmexx is introduced into automotive industries to increase performance of internal combustion engine, hence reducing bad emission to the environment. The objective of the study is to investigate the effect of various Tripmexx mixed into 80% diesel and 20% biodiesel (B20) with an amount of 0.1 ml (B20-0.1), 0.2ml (B20-0.2), and 0.3ml (B20-0.3) compared to conventional pure diesel. The experiment was carried out by using single cylinder, four-stroke diesel engine, and conducted with constant speed at range of 1000, 1500, and 2000 rpm with various load range from 2Nm to 6Nm. For constant speed 2000 rpm, the B20-0.3 is in lower brake specific fuel consumption value compared to the diesel fuel by 40% on average. The blend B20-0.3 produce higher brake thermal efficiency reading compared to diesel fuel by 5%. Besides, the carbon monoxide and hydrocarbon product of B20-0.3 is lower than diesel fuel by 92% and 0.002% respectively. However, the nitrogen oxide and carbon dioxide produced by B20-0.3 is higher than diesel fuel by 68% and 50% respectively. In overall, the B20-0.3 shows the best results for all measured parameters at all engine test due to consideration of green fuel.

The study aims to evaluate the performance and emission characteristic in a compression ignition engine of conventional diesel fuel-biodiesel blends with different percentage of fuel additive n-butanol. The experiment was operated at a constant engine load (50% throttle condition) with different engine speed (2700, 3100, 3500 rpm). A blend of biodiesel and diesel fuel known as B20 (20% palm oil methyl ester and 80% diesel in volume) was prepared, and then n-butanol was added to B20 at a volume of 5ml, 10ml and 15ml (denote as B20+Bu5, B20+Bu10 and B20+Bu15, respectively) and the tested fuel samples were compared with diesel fuel and diesel-biodiesel (B20). The experimental results show that when the proportion of n-butanol was increased in B20 blends, kinematic viscosity was larger while calorific value was smaller than those of the neat diesel. Although n-butanol have some negative impacts on engine performance parameters, its generally positively affect exhaust emission parameters compared to diesel fuel. According to engine performance and exhaust emission test result of n-butanol fuel blends with B20 blends, average values of brake thermal efficiency (10.19%, 7.58% and 4.29%), carbon monoxide (21.75%, 17.06% and 11.28%), hydrocarbon (18.51%, 15.68% and 12.13%) are lower, while brake specific fuel consumption (BSFC) (27.48%, 45.37% and 59.20%) are higher and carbon dioxide (CO2) and oxides of nitrogen (NOx) are comparable than those of diesel fuel.

Transport technology development is a major issue leading to increase the number of vehicles, hence increase emissions and contributing to global warming. In this work the effect of fuel additives (ethanol) on the engine performance and emissions of single cylinder diesel engine fueled with palm oil methyl ester (PME) (B20) were investigated. The tests were performed by varying the engine speed between 2700, 3100 and 3500 rpm with intervals 400 rpm while maintaining the engine load at 50% of rated load. In this study, different fuels which is B0 (100% Pure diesel), B20 (20% PME), E5 (20% PME + 5ml ethanol), E10 (20% PME + 10ml ethanol) and E15 (20% PME + 15ml ethanol) were used. The result indicated that, average brake specific fuel consumption (BSFC) and Brake thermal efficiency (BTE) for usage of E5, E10 and E15 were increased compare with B0 and B20. Meanwhile, average value results of Carbon Monoxide (CO) and Unburned Hydrocarbon (UHC) for E5 was lowered compare to PME (B20). The addition of ethanol with PME (B20) fuel in single cylinder diesel engine can help in controlling exhaust emission and significantly improve engine fuel consumption.