The Effects of Excess Oxygen to Mixture on the Gasses Emissions of a Gasoline Engine

Problem statement: The effects of excess feeding oxygen to the fuel-air mixture on the exhausts gasses emissions concentrations are investigated here. It is known that spark-ignition and diesel engines are considered as major sources of urban air pollution; such pollutants are CO₂, CO, HC. Hence, many techniques have been used to decrease such emissions such as: Catalytic converters, oxidizers, traps and Diesel Particulate Filters (DPF), but these techniques have some disadvantages represented by: Forming back pressure which affects the engine performance, plugging and high costs. Approach: In present study the effects of feeding more oxygen to the combustion mixture is studied experimentally. Results: It was found from tests applying on an engine that excess oxygen has positive results in decreasing concentration of both CO and HC's. Conclusion/Recommendations: CO₂concentration at oxygen injection test is greater than that at without oxygen injection at the two cases: With load and without load tests and at nearly all engine speeds. CO concentration at oxygen injection test is much less than that at without oxygen injection at the two cases: With load and without load tests and at nearly all engine speeds. HC concentration at oxygen injection test is less than that at without oxygen injection at the two cases: With load and without load tests and at nearly all engine speeds. It also recommended using more amount of oxygen in the future to find the optimal value of oxygen can be fed and if anther fuel additives can be used.