Hybrid Vehicle Supervisory Controller Development Process to Minimize Emissions and Fuel Consumption in EcoCAR 2
Crain, Trevor Alexander
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This thesis presents the design process used to create and validate a hybrid vehicle supervisory control system for a plug-in hybrid electric vehicle in the EcoCAR 2 competition. The vehicle utilized a Parallel through the Road hybrid architecture with a B20 biodiesel engine-powered front axle and electric motor-driven rear axle. The primary goal of this work is to present a selection of the processes used by the controls team throughout the competition to define the control system requirements and platforms, model the components of the vehicle and validate each model, and estimate the effects of various control system strategies and parameters on overall vehicle performance. The advantages of using a version-controlled Simulink model for supervisory controller development are discussed along with an explanation of the software architecture and primary hybrid control modes. The models developed to simulate the primary drivetrain components are detailed in addition to their parameterization and validation testing methods. The final chapter presents an analysis on dynamometer test data used to quantify the effects of various controller parameters and strategies on the results of the Emissions and Energy Consumption (E&EC) event's dynamic drive testing. The electrical energy consumption of the vehicle during charge depleting mode testing is used to select a state of charge value for transitioning to charge sustaining mode. Various implementations of engine stop start are also analyzed, showing the potential for a 3.8% improvement in B20 fuel consumption over the course of the City/Highway E&EC drive cycle.
- Mechanical engineering