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MUEV Phase III

MUEV Phase III. By: Kevin Jaris & Nathan Golick. Introduction. Petroleum is a finite resource. Demand for clean energy is driving the increase in the production of electric cars. Improvements in regenerative braking techniques will increase the range and efficiency of electric cars.

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MUEV Phase III

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  1. MUEV Phase III By: Kevin Jaris & Nathan Golick

  2. Introduction • Petroleum is a finite resource. • Demand for clean energy is driving the increase in the production of electric cars. • Improvements in regenerative braking techniques will increase the range and efficiency of electric cars.

  3. Regenerative Braking • Cars generally dissipate kinetic energy via friction braking. • Regenerative braking recovers a significant amount of the kinetic energy. • Energy returned to battery. • Increases range per charge.

  4. Past Work Phase I • Design a prototype electric vehicle test platform for testing with the following specifications: • Minimum round trip distance of 25 miles • Maximum speed of 40 mph • Operate within temperature range of -10˚F to 100˚F • Acquire and display data from the motor and battery subsystems • Operate within a curb weight of 800 to 1800 lbs

  5. Past Work Phase II Modeling • Battery • DC Motor • Controller • Vehicle Dynamics • Loads • A/C • Lighting • Heat Verify and Optimize Vehicle Model • Perform data acquisition • Adjust model until desired performance is achieved. • Compare experimental and simulated outputs of subsystems

  6. Original Project Goals • Design and simulate power electronics • Build power electronics • Test power electronics in lab • Connect to DC motor/generator • Create braking profile • Model in Simulink • Investigate variable speed drive

  7. Functional Description • The DC motor/generator produces a back EMF voltage during regenerative braking. • Back EMF voltage is the input to the boost converter. • The boost converter output is 43 volts. • Output voltage charges batteries.

  8. Performance Specifications • Generate a constant 43 volt output voltage while in regenerative braking mode • Braking voltages range from about 5 to 35 volts. • System designed for minimal project construction costs.

  9. System Block Diagram

  10. Boost Converter Basics

  11. Design Process • Calculate the component values • Design and simulate the boost converter • Build boost converter • Analyzed and compared the results • Solve problems that arose

  12. Design Equations

  13. Boost Converter Schematic

  14. Low Voltage Input Boost Converter Simulation Vin

  15. High Voltage Input Boost Converter Simulation

  16. Test Setup

  17. Additional Circuitry • Safety shut off circuit • Gate driver circuit • Snubber circuit

  18. Issues • MOSFET temperature • Power supply current limit • Wire gauge • IC chips highly vulnerable to static discharge • Individual to series inductor switch

  19. Output Voltage

  20. Input Current and Drain Voltage

  21. Solutions • Parallel MOSFETs • Parallel inductors • Thermocouple to monitor temperature • Fan and heat sinks for heat dissipation to keep case temperature under 90º C • Moved to power lab • Replaced wire with 16 gauge • Testing and replacement of ICs

  22. Final Results

  23. Accomplished Goals • Designed and simulated boost converter/power electronics • Built power electronics • Tested power electronics

  24. Future Work • Complete duty cycle controller • Attach DC motor/generator • Test with braking profile • Model subsystem in Simulink • Connect regenerative braking system to the MUEV

  25. Questions?

  26. Power Dissipation

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