Automotive power trains that will meet upcoming emissions standards will be designed as a system so as to include simultaneous consideration of engine performance, engine management strategies and aftertreatment technologies. Therefore, computer simulations of each component and of the entire system are needed to ensure timely and complete investigation of the many design and operating variables. To date, such simulations have been limited by the lack of robust exhaust aftertreatment models that can be integrated with engine and/or control system development. The problem of simulating aftertreatment is particularly severe for lean burn, compression ignition engines, which use new families of catalysts that must operate effectively across a much lower range of temepratures and a much wider range of stoichiometries than 3-way catalysts.
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