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Embedded software development has been dramatically improved with model based design and auto code generation tools. However, the development process of complicated embedded control systems still faces great challenges. Modern embedded control becomes so complicated due to sophistical control hardware and control optimization driven by competitive pressure and regulations. For example, engine embedded control development has to consider global emissions and On Board Diagnostics (OBD) regulations besides various vehicle platforms for the global market. This paper presents several design aspects for complex embedded control software architecture including component based design, component management, and software validation. The paper discusses several software architecture design ideas and analyzes their design benefits and disadvantages. Finally, the paper proposes a software architecture design and provides a design example.

Current and future emission levels on Particulate Matter (PM) will require diesel engines to use Diesel Particulate Filters (DPF). One of the challenges of using a DPF is the requirement to generate high temperature exhaust flow (typically 550 - 650 degrees C) to enable filter regeneration, especially at cold temperatures and transient conditions. Maintaining constant temperature and low emissions during regeneration presents a number of controls challenges. This is especially true for burner systems which have complex air, fuel, and ignition systems. This paper outlines the controls and diagnostics of a burner system. Details of the burner system component modeling, thermal modeling of combustion, combustion flame detection, and system control and diagnostics are also illustrated. Application data is presented to demonstrate performance and robustness of the system at different engine conditions.