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Control of a Urea SCR Catalytic Converter System for a Mobile Heavy Duty Diesel Engine

2003; Linguagem: Inglês

10.4271/2003-01-0776

2688-3627

C. M. Schär, Christopher H. Onder, Hans P. Geering, Martin Elsener,

Catalysis and Oxidation Reactions

An advanced controller for a urea SCR (Selective Catalytic Reduction) catalytic converter system for a mobile heavy-duty diesel engine is presented. The after-treatment system is composed of the injecting device for urea solution and a single SCR catalytic converter. The control strategy consists of three parts: A primary feedforward controller, a surface coverage observer, and a feedback controller. A nitrogen oxide (NO x ) gas sensor with non-negligible cross-sensitivity to ammonia (NH 3 ) is used for a good feedback control performance. The control strategy is validated with ESC and ETC cycles: While the average NH 3 slip is kept below 10 ppm, the emission of NO x is reduced by 82%.