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Solar Powered Golf Cart

Solar Powered Golf Cart

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Solar Powered Golf Cart

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  1. Solar Powered Golf Cart Group 9 With Support from: Jake Bettis Jacob Krueger Matthew Roland Matt Tourtelot

  2. Motivation • Rapid growth in renewable energy, such as solar power, has caused a huge increase in the demand for engineers that know how to utilize these alternative sources of energy • With our project we are able to design and create an environmentally friendly vehicle while gaining first-hand knowledge and experience in a growing industry

  3. Goals To create an energy efficient golf cart that is capable of running on solar power and external outlet. A touch-screen display will give the user options for different energy modes, navigational help, and status of golf cart

  4. Objectives • Harvest energy from sunlight to power electric motor and onboard electronic systems • Three modes of energy operations • standard, max performance, max efficiency • Power monitoring system to display battery levels and check for battery storage defects • User touch-screen display • Provides navigational map interface • Allows users to change cart’s operating mode • Displays cart’s current speed, current mode, and battery charge remaining.

  5. Objectives Energy Modes • Standard mode: A normal acceleration ramp will be used for this setting • Max Performance: The motor controller will ramp up the speed almost instantly • Max Efficiency: The motor controller will ramp up the speed very slowly • The biggest power drain on the cart is acceleration so this was controlled to save energy

  6. Specifications and Requirements • Must have a top speed of at least 15 mph • Must have 3 modes of operation which can be controlled by user • Must run off of a 36V or 48V battery storage bank • Batteries must be able to charge from solar panels or wall outlet • Must have atouch-screen display for user information • Must provide navigational aid to user • Must provide power mode options and current speed

  7. Budget

  8. Power System Components • Solar Panels and Wall Outlet • provide power for motor and onboard electronics • Solar Charge Controller • Regulate power inputs from solar panels the batteries • Implement MPPT algorithm to keep from overcharging and damaging the batteries • Battery Bank • provides 36V battery supply

  9. Power System Overview Touchscreen Display 5V DC/DC Regulator Wall Outlet Oddroid C1 Motor Battery Bank +36 V Power Board Solar Charge Controller Solar Panels 3.3V DC/DC Regulator Motor Controller

  10. Solar Panel Electrical Specs Project design implements two panels connected in series. *Specs are based on single panel at standard test conditions

  11. Battery Supply • 36V battery bank that will power motor and all onboard electronics • Flooded lead-acid, deep cycle batteries • Able to withstand deep discharge cycles and have a long lifetime • At 25A output batteries can last for 474 minutes, and 122 minutes at 75A

  12. Battery Specs U.S. 2200-XC2 Deep Cycle Lead-Acid battery

  13. Battery Specs • Rate of discharge • Batteries need to be able to operate for as long as possible while supporting different energy modes • Consider current vs. discharge time

  14. Charge Controller • Goal is to regulate voltage and current from solar panels to the battery, to prevent overcharging • Will implement a maximum power point tracking (MPPT) algorithm • Finds the maximum power point on the I/V curve and tracks that point as sunlight conditions vary • Works as DC to DC converter • Outputs GPS coordinate information to the microcomputer • Design is based off of Texas Instruments TIDA-00120

  15. Solar Charge Controller Schematic • Block diagram of Solar Charge Controller System • SM72295: Photovoltaic Full Bridge Driver • INA271 : voltage output, current sense amplifier

  16. Solar Charge Controller Schematic • MSP430F5132: ultra-low power mixed signal microcontroller • LM5019: 100V buck regulator • TLV70433: low dropout regulator (LDO)

  17. MPPT Algorithm • Perturb and Observe • Method is to modify the operating voltage or current from PV panel until you obtain maximum power from it

  18. Touchscreen Display System Objectives • Provide users with straightforward navigation around the UCF campus via GPS location • Navigational map will be interactive and contain certain customizable features • Display the golf cart’s current speed and operating mode • Allow users to easily switch between available cart operating modes

  19. Touchscreen Display System Components • Microcomputer • Provides platform for Android Operating System • Processes GPS and display signal input and output • GPS PCB module • Outputs GPS coordinate information to the microcomputer • Touchscreen Display • Provides user with display of the Android Application • Supplies microcomputer with user input

  20. Touchscreen Display Data Flow Chart

  21. Microcomputer

  22. ODROID C1 Features Implemented • Android Runtime Environment compatibility • Allows for the creation of a specialized Android Application • Easy Debugging • HDMI video signal output • Allows video signal to be sent to the touch screen display while freeing up the USB input for the touch screen’s user input signals

  23. Touchscreen Display

  24. MTK3339 GPS Module • Sends GPS data pertaining to the current user position to the ODROID C1 • 10 Hz update frequency • Accurate to about 3 meters

  25. GPS Module - PCB Schematic

  26. GPS Module - PCB Design

  27. GPS Module - PCB

  28. Android Application Development • Developed within the Eclipse IDE using the latest Android SDK • Many other inherent features of Java are used throughout the application design • Tested for accuracy and reliability on every design prototype iteration

  29. Android Application Class Diagram

  30. UCF EzNAV Main Menu • Very simple, intuitive interface • The only screen that gives access to every created class • Each button takes the user to a new screen within the app

  31. Navigate Screen • Interactive Google Maps Fragment • “My Location” button and functionality • Map markers for reference and building information • License key for Google Maps API obtained through Google Inc.

  32. Cart Status Screen • Features updating data fields for cart information • Uses signals from the Motor Controller and GPS module to generate values • Interface buttons that allow users to change the cart’s operating mode

  33. Motor Controller Overview • Pre-charge circuit prevents inrush current to motor controller • Potentiometer pedal provides a voltage from 1.45-1.92 • Direction switch removes need for H-Bridge

  34. Power Board

  35. Power Board Schematic Capacitance Flyback diodes • High current MOSFET’s • On-Resistance of 1.45mΩ

  36. Motor Controller Logic

  37. Pedal • Potentiometer over ITS

  38. Modes of Operation • Mode determined by user from touch screen

  39. Progress

  40. Questions?