Effects of Intake Oxygen Concentration on the Characteristics of Particulate Emissions from a D.I. Diesel Engine 861233
The concept of oxygen enriched charging (OEC) was exploratively examined as a means of reducing particulate emissions from a direct injection (DI) diesel engine. A single cylinder DI engine was operated with intake gas oxygen concentrations of 21% to 29%, under a constant engine speed of 40 Hz, and several load conditions. It was found that OEC reduces particulate emissions from a DI diesel engine for all operating conditions tested. Insoluble particulate is especially suppressed by OEC at high load conditions. Oxygen enriched charging has little effect on particulate size distribution at high loads when the mass fraction of extractables is low. Fuel consumption, at constant injection timing, is improved a little by OEC. Emissions of NOx increase exponentially with increasing oxygen concentration. Ignition delay is decreased by OEC and this allows injection timing to be retarded to reduce NOx emissions without increasing the specific fuel consumption.
Citation: Iida, N., Suzuki, Y., Sato, G., and Sawada, T., "Effects of Intake Oxygen Concentration on the Characteristics of Particulate Emissions from a D.I. Diesel Engine," SAE Technical Paper 861233, 1986, https://doi.org/10.4271/861233. Download Citation
Norimasa Iida, Yasutoshi Suzuki, G. Takeshi Sato, Takashi Sawada
Faculty of Science and Technology Keio University, Nissan Motor Co., Ltd. (previously of Keio University)
1986 SAE International Off-Highway and Powerplant Congress and Exposition
Combustion, Heat Transfer and Analysis-P-182