Engine drive and environmental characteristics when fuel mixed with waste cooking oil is used for a small diesel engine

Background: This study aims to measure the output torque and analyze the exhaust elements of a small diesel engine that use the diesel fuel mixed with waste cooking oil to validate the driving and environmental characteristics of this fuel. Methods: The fuel used was diesel fuel mixed with 15% of waste cooking oil, a small quantity of additives and was produced with no complicated refining process (WCO15). Continuous driving experiments were conducted for 90 min with it and the results were compared with the data obtained with pure diesel fuel (WCO0). Results: As for the engine driving characteristics, engine speed, output torque, and fuel consumption were meas‐ ured. As for the exhaust, a statistical analysis was conducted on temperature, O2, CO2, NO, and NO2. Conclusions: As a result, the torque of WCO15 was 65.6% in comparison with WCO0 at the engine speed of 3600 rpm. In either fuel, the O2 concentration and temperature of exhaust showed a negative correlation, while CO2 and NO concentration showed a positive correlation.