ASM - Diesel Exhaust System Model

Real-Time Diesel Exhaust System Model

• Open MATLAB^®/Simulink^® model
• Real-time simulation and offline simulation
• Diesel oxidation catalyst (DOC) model
• Diesel particulate filter (DPF) model
• Selective catalytic reduction (SCR) model

Diesel Aftertreatment Model Characteristics
The ASM – Diesel Exhaust System Model mainly consists of a DOC, a DPF, and a SCR system. It covers typical sensor variables for ECUs in DOC and DPF applications, such as temperatures, pressures and lambda values. These applications investigate effects of soot trapped by filtering material and of DPF regeneration. The oxidation of post-injections and of fuel introduced by catalytic burners is also included in the model. With its solution for simulating common AdBlue and diesel exhaust fluid (DEF) dosing systems with and without air supply and its modeling concept for evaluating the urea decomposition and chemical process of the catalytic reduction, the ASM – Diesel Exhaust System Model can be used as a basis for modeling today’s aftertreatment systems.

Schematic of a diesel exhaust system with DOC, DPF and SCR models.

• Pressure drop over DOC/DPF
  
• Temperature before and after DOC/DPF
  
• Lambda before and after DOC/DPF
  
• Particulate mass in DPF
  
• DPF regeneration by post-injection or a catalytic burner
  
• AdBlue/DEF dosing system with and without air supply
  
• Urea decomposition upstream of the SCR catalyst
  
• Spatial discretization of the SCR cells via series of identical cells
  
• Easy to insert in ASM Engine Models
  
• Numerical integration stabilized via local oversampling
  
• Modular, library-based implementation
  
• Straightforward variable access
  
• Fully integrated into the dSPACE tool chain