Evaluation of the fuel commercial additives effect on exhaust gas emissions, fuel consumption and performance in diesel and petrol engine

摘要

The paper deals with the impact assessment of the additives used in diesel and petrol fuel to improve the power and emission parameters of the vehicle and its consumption. The usage of additives in engine fuels have an increasing tendency. The manufacturers claim that additives have positive impact on engine operating parameters, cleaning the fuel supply system and decreasing fuel consumption by improving the engine combustion process. Based on the above statements, measurements were performed to determine change in the engine parameters utilising additives. Measurements were performed under laboratory conditions on the MAHA MSR 500 test bench (dynamometer) to simulate free driving cycle selected by authors, which were carried out at constant engine speeds and constant load. Focus have been given on tracking of the vehicle's external speed characteristic and measurement of selected parameters: CO, HC, O2, fuel consumption (petrol engine) and smoke, fuel consumption (diesel engine). Resulting values of the driving cycles measured before and after additives application have been then compared. The result of experiment confirmed that tested fuel additives improved performance and torque depending on engine mileage and fuel type. Tested diesel engine with the higher mileage (approx. 388 k km) showed significant increase in power (cca 3.57%) and torque while in newer petrol engine (approx. 73 k km) improvement has not been measured. Emissions were improved in both engines. Difference has been also measured in fuel economy as in petrol engine consumption insignificant increased while in the diesel engine it decreased. This paper brings new complex view on energetical and emission changes in internal combustion engines.