Experimental Study On The Influence Of Vehicle Fuel And Oil Improvement Technology On Diesel Engine Emission

In recent years, Chinese automobile industry developed rapidly, and the domestic car ownership surged. By the end of 2014, China’s vehicle population has reached 246 million, diesel vehicles accounted for 14.1%. With the deterioration of motor vehicle pollution, increasingly stringent vehicle emission regulations and the development of motor vehicle emission purification apparatus, vehicle fuel and oil requirements will become increasingly high. This paper explores three kinds of technology to improve vehicle fuel and oil, respectively, to enhance the basic diesel oil, the engine oil and the use of alternative fuels. We use diesel fuel additives and oil additives to improve oil and diesel oil, using poly methoxy two methyl ether (PODE) as an alternative to diesel fuel. Diesel fuel additives used is a kind of combustion and detergency additives, engine oil additive is a kind of biomass of friction and sealing agent, PODE is a mixture by mass ratio of PODE2:PODE3:PODE4=2.553%:88.9%:8.48%, blended with pure diesel fuel mass ratios were 5%(P5),8%(P8),10%(P10),12%(P12),15%(P15) and 20%(P20). This trial is carried out on a diesel engine test bench, we select a light line four-cylinder diesel engine for the emission test. We controlled test conditions the same for load characteristic test, the main collection emissions ware carbon monoxide (CO), total hydrocarbons (THC), nitrogen oxides (NOx) and particulate matter, each test was repeated 4-5 times to eliminate the abnormal data from average as the final result. The experimental results are as follows:(1) After using the selected additive CO and THC emissions almost unchanged, in the low load has increased, about 20%. NOx emissions have a certain degree of reduction of about 5%, and emission trends and base diesel fuel similar. After the use of additives, the quality of particulate emissions at low load and high load have reduced, while no significant change in the mid load. Particle number concentration emissions in low load increased, the load both quite, high load have significantly reduced.(2) After using the selected oil additives, CO and THC emission ratio did not change significantly, and only at low load is slightly reduced, reducing the amount of, respectively, 16% and 13%. NOx emissions are increased, the largest of about 15% can be achieved. Particulate mass emissions will reduce, maximum up to 53%. The use of additives on emissions below 20 nm and 50 nm above the particle number concentration has the effect of reducing, and slightly increased within the range of 50nm particle number emission concentration.(3) After using PODE and diesel blended fuel, CO and THC emissions decreased, maximum reduction was at low load, the engine can reach 30%. NOx emissions increased overall, with the blending ratio increased at first increased and then decreased, P10 increased the amount of large, up to 20%, P20 increased the amount is small, up to 12%. At low load, adding PODE can reduce the particle number concentration, P5 maximum reduction, with the increase of blending ratio, reduction decreases gradually. At mid load, the change of particle number concentration is not obvious. At high load, with blending ratio increased the particle number concentration increased firstly and then decreased. Overall, the addition of PODE in pure diesel, with the increase of blending ratio, the number of aggregated particles decreased.(4) After comparing the different vehicle fuel and oil improvement technology, we can found that the 20% mass ratio of PODE-diesel fuel blends (P20) is an ideal alternative fuels on the engine exhaust emissions.