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Engine Speed Control for HMMWV

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Engine Speed Control for HMMWV. Members. Faculty Advisor Industrial Advisor Dr. Marshall Molen Mr. Dan Harkins Picture Unavailable Team Members Team Leader

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Engine Speed Control for HMMWV

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  1. Engine Speed Control for HMMWV

  2. Members • Faculty AdvisorIndustrial Advisor Dr. Marshall MolenMr.Dan HarkinsPicture Unavailable • Team Members Team Leader Daniel Kennedy Patrick McNally Catalina Olarte Jarrod Fortinberry Overcurrent Protection Stepper Motor Research Website Design Research Signal Processing Power Electronics Simulations Microcontroller Interface

  3. Overview • United States Army wants to deploy high-power mobile radar equipment in remote areas • Integrating these systems into HMMWVs would allow remote deployment Problem • The change in electrical load requires a change in speed • HMMWV is unable to supply required power at idle speeds Effects • Load does not receive required power • Increased wear and tear on the engine

  4. SDII Focus • Lower power (cost) DC to DC converter • Improve driver circuit • Simulation • Design packaging • Improve stability at higher RPMs through use of a longer lever arm

  5. Cheaper DC/DC Converter Stepper Motor New Design Old Design Electromagnet 28V From Battery 12V DC/DC Converter 5V +/- 15V Electronics Current Transducer Smaller and cheaper converter reduces component costs by $58.40

  6. Current Chopper Stepper Motor Chopper Circuit New Design Electromagnet 28V From Battery 5V DC/DC Converter +/- 15V Electronics Current Transducer Reduces the size of the circuit. Reduces heat generation and power consumption of stepper motor and driver circuit.

  7. Simulation • Previous schematic functioned based on discrete data points collected through experimentation • New schematic uses more advanced models taken from the SimPower toolbox to model the electrical system

  8. Simulink Schematic

  9. Simulation Results

  10. Packaging • Packaging requirements: • Withstand extreme environmental conditions • Solution: • Pre-manufactured, NEMA4 rated, aluminum enclosure

  11. NEMA Standards • National Electrical Manufacturers Association standards publication No 250 • NEMA 4 : • Indoor/outdoor use • Protection for operators against incidental contact • Protection from: • Falling dirt • Rain • Sleet • Snow • Windblown dust • Splashing and hose directed water • External formation of ice will not damage unit

  12. Old Throttle Attachment Pivot point • Too close to the pivot point • At high RPMs the resolution of the stepper motor is inadequate Throttle attachment

  13. New Throttle Attachment New attachment • Longer lever arm: • Increases accuracy • Decreases stabilization times • Increases torque Old attachment Pivot point

  14. Manual Mode Stabilization Time

  15. Auto Mode

  16. Design Constraint - +/- 1% Controller stabalizes within +/- 50 rpms over the entire range. Design constraint – +/- 5% Controller Accuracy

  17. Cost Summary Design constraint: Cost of Parts < $600

  18. Acknowledgement s • Dr. Marshall Molen • Evan Burnett • Bill Buchanon • Josh Lofton • Angela Card • Robin Kelley • Dan Harkins • Dr. Picone

  19. Questions??

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