A PC-based model for predicting NO{sub}x reductions in diesel engines

摘要

A menu-driven, PC-based model, ALAMO-ENGINE, has been developed to predict the nitrogen oxides (NO{sub}x) reductions in direct-injected, diesel engines due to exhaust gas recirculation (EGR), emulsified fuels, manifold or in-cylinder water injection, fuel injection timing changes, humidity effects, and intake air temperature changes. The approach was to use a diesel engine cycle simulation with detailed gas composition calculations for the intake and exhaust gases (including EGR, water concentration, fuel-type effects, etc.), coupled with a code to calculate stoichiometric, adiabatic flame temperatures and expressions that correlate measured NO{sub}x emissions with the flame temperature. Execution times are less than 10 seconds on a 486-66 MHz PC.