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EcoCAR: The NeXt Challenge Technical Success Story: Development of a Biodiesel Power Split Extended Range Electric Vehicle Control Design and Hardware In the Loop System B20 Power Split EREV – ERAU HyREV Vincent Sabatini, Jen Haydt, J.E. McKisson Embry-Riddle Aeronautical University EcoEagles May 11th, 2009 Introduction Developing the control system of a hybrid vehicle is significantly more complicated than a traditional automotive system. The addition of motors, electrical storage systems, and additional power saving regenerative braking subsystems imposes complex requirements for a robust control system. A careful balance must be maintained as power flows between the engine, motors, energy storage system and the road to maintain a smooth, responsive driver experience even at times when the vehicle will be exchanging power in complex ways. Comprehensive physical testing of a hybrid system is also very difficult, expensive, and dangerous, due to the high power – both electrical and mechanical. One approach to minimizing the exposure to the hazards and expense of testing at the prototype vehicle stage is to move mush of the design and test activities to high-realism simulation. Enter the Embry-Riddle HyREV system, an innovative combination of power split Hybrid and extended-Range Electric Vehicle technologies. The EcoEagles are performing advanced hybrid driveline simulation and analysis on the HyREV using modern control system development techniques in order to design a control system that will maximize both the performance and the efficiency of the vehicle. Solution The control development process can be summarized in fives phases; requirements/specification development, algorithm development, SIL/HIL testing, vehicle integration and validation. These development phases have been further refined, as shown by the V-diagram in Figure 1. Figure 1: ERAU V Diagram for Control Systems The Embry-Riddle HyREV system has both a low level control system operating on the supervisory control unit (SCU) and a high level control system called the Interpretive Driving Efficiency Assistant (IDEA). Both the SCU team and IDEA team follow a structured development process. Each system will be validated using the V-model for system development. As the design progresses, new test cases are developed to ensure that the implementation will meet design requirements at the unit level. Read the full Technical Success Story |
