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Baja Hybrid Drivetrain Design P14224

Thank You Sponsors. Baja Hybrid Drivetrain Design P14224. Thank You Sponsors. Problem Statement Identification of Critical Subsystems Identification of Vehicle States Analysis of Vehicle States Mechanical Subsystems Electrical Subsystems Mechanical Subsystem Interfaces Test Plan Update

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Baja Hybrid Drivetrain Design P14224

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  1. Thank You Sponsors Baja Hybrid Drivetrain DesignP14224

  2. Thank You Sponsors Problem Statement Identification of Critical Subsystems Identification of Vehicle States Analysis of Vehicle States Mechanical Subsystems Electrical Subsystems Mechanical Subsystem Interfaces Test Plan Update Budget Update Agenda

  3. The RIT Baja Team has expressed an interest in improving drivetrain efficiency and dynamic control. The drivetrain has not had a significant format change since the 90’s, using a single speed reduction box coupled with a CVT. While this has been and continues to be an effective means of transmitting power to the wheels, and is the preferred solution amongst the top performing teams, the team would like to explore other options; specifically a gas-electric design. The team would like to receive a working bench top prototype of the drive system for the purpose of testing the gas electric system to compare it to the existing system. Problem Statement

  4. Identification of Critical Subsystems

  5. Engine and Alternator Mounting • CR 3, 5 • ER 5, 15, 19 • DR 18, 19 • Wheel and Traction Motor Mounting • CR 5, 6 • ER 12, 14, 17, 19 • DR 20 Critical Subsystems - Mechanical

  6. Controller • Engine System • Motor System • Accumulator System • Temperature • User Input Critical Subsystems - Electrical

  7. CR 1, 2, 4, 5 • ER 9, 10, 11, 12 • DR 16, 17 Electrical – Engine System

  8. CR 2, 4, 6, 13 • ER 11, 12, 17 • DR 1 - 7 Electrical – Motor System

  9. CR 10, 13, 14 • ER 5, 13, 14, 16 Electrical – Accumulator System

  10. CR 15 • ER 6, 7 • DR 14, 15 Electrical - Temperature

  11. CR 1, 2, 4, 11, 13, 16 • ER 5, 8, 9, 10, 13, 14, 21 • DR 16, 17 Electrical – User Input

  12. Identification and Analysis of Vehicle States

  13. Acceleration / Sled Pull / Mud Bog / Hill Climb • Taxi • Full Throttle/Accelerating • Braking • Maneuverability / S+T / Rock Crawl • Taxi • Acceleration • Braking • Cornering • Endurance • Taxi • Acceleration • Braking • Cornering • Constant Speed Race Event Breakdown

  14. Vehicle at Rest • Engine Off • Engine On • Cap bank full • Cap bank not full • Vehicle in Motion • *** Cap bank full/not full applies to all • Accelerating/Full Throttle • Coasting • Braking • Constant Speed • Taxi Vehicle States

  15. At Rest, Engine Off • Mechanical • System loading at a minimum • Electrical • No electrical power flow

  16. At Rest, Engine On, Cap Full • Mechanical • System loading at a minimum • Electrical • Alternator power in control closed • Power available for motor controller

  17. At Rest, Engine On, Cap not Full • Mechanical • System loading at a minimum • Electrical • Alternator power in control open

  18. Accelerating/Full Throttle • Mechanical • Maximum drive torque developed • Full tractive load • Electrical • All power is flowed to the motor controller • As voltage of system drops capacitorbank releases extra energy slowing the voltage fall

  19. Coasting, Cap Full • Mechanical • Driveline in motion, but minimum loading • Electrical

  20. Coasting, Cap not Full • Mechanical • Driveline in motion, but minimum loading • Electrical • Regen power used to charge cap bank

  21. Braking, Cap Full • Mechanical • Maximum drive torque developed • Full tractive load • Electrical

  22. Braking, Cap not Full • Mechanical • Maximum drive torque developed • Full tractive load • Electrical • Accumulator in charge state

  23. Constant Speed, Cap Full • Mechanical • Intermediate drive torque developed • Intermediate tractive load • Electrical • Alternator supplies all necessary power to drive motor (engine may be revved down to conserve gas)

  24. Constant Speed, Cap not Full • Mechanical • Intermediate drive torque developed • Intermediate tractive load • Electrical • Extra power diverted to cap bank charging

  25. Mechanical Subsystems

  26. Engine and Alternator Mounting

  27. Traction Motor and Drive Wheel Mounting

  28. Electrical Subsystems

  29. Engine Control System

  30. Motor Control System

  31. Accumulator System (Small Scale Results) Accumulator Steadily Charging Accumulator Steadily Discharging

  32. Accumulator System High-side driver applied to accumulator system circuitry

  33. Accumulator System Accumulator software flow diagram

  34. Temperature Control System

  35. Mechanical Subsystem Interface

  36. Engine to Alternator

  37. Governor Linkage

  38. Engine Clutch

  39. Test Plan Update

  40. Mechanical Test Plan • Traction motor selection • Receive torque information for RR selection • Begin cart design • Begin Sub frame design • Concept motor cooling • Reduction ratio range selection Test Plan Update Electrical Test Plan • Select microprocessor • Begin controller board layout • Concept motor cooling control • Continue software development • Continue development of accumulator control circuitry • Test: • Accumulator control circuitry • Encoder inputs • Servo control and power • Update bill of materials

  41. Budget Update

  42. Appendix Figure Customer requirements

  43. Appendix Figure Engineering requirements

  44. Appendix Figure Developed requirements

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