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ACTIVE SUSPENSION TEST PLATFORM

ACTIVE SUSPENSION TEST PLATFORM. BY. BRANDON NAYDEN & CHIAO LIU. ADVISED BY: STEVEN GUTSCHLAG. TABLE OF CONTENTS. PROJECT SUMMARY FUNCTIONAL DESCRIPTION SPECIFICATIONS BLOCK DIAGRAMS INPUTS/OUTPUTS EQUIPMENT/PARTS LIST DIVISION OF LABOR DISCUSSION OF HARDWARE/SOFTWARE

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ACTIVE SUSPENSION TEST PLATFORM

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  1. ACTIVE SUSPENSION TEST PLATFORM BY BRANDON NAYDEN & CHIAO LIU ADVISED BY: STEVEN GUTSCHLAG

  2. TABLE OF CONTENTS • PROJECT SUMMARY • FUNCTIONAL DESCRIPTION • SPECIFICATIONS • BLOCK DIAGRAMS • INPUTS/OUTPUTS • EQUIPMENT/PARTS LIST • DIVISION OF LABOR • DISCUSSION OF HARDWARE/SOFTWARE • COMPLETED WORK • QUESTIONS

  3. To simulate a suspension system for testing purposes. Actuator driven platform. Simulation for vehicular applications. PROJECT SUMMARY

  4. A micro-controller controlled H-bridge will dictate the movement of the actuator platform Movement will be in a vertical fashion User input will specify desired duty cycle, direction, and waveform Digital control feedback Liquid crystal display will indicate current user desired output FUNCTIONAL DESCRIPTION

  5. SPECIFICATIONS • Platform velocity of 7 inches/second • Platform load capacity of 200 pounds • User-friendly interface • Safe environment

  6. FINAL PLATFORM CONFIGURATION

  7. LOW LEVEL SYSTEM BLOCK DIAGRAM

  8. INPUTS Direction Duty Cycle Waveform Displacement Position Sensor OUTPUTS Platform Movement Current user input on liquid crystal display INPUTS/OUTPUTS

  9. EQUIPMENT LIST(HARDWARE) • DC SERVO MOTORS • IR2213 HIGH LOW DRIVERS • IRF640 TRANSISTORS • IRF350 TRANSISTORS • 4N25 OPTICAL ISOLATORS • LINEAR ACTUATOR • MICRO-CONTROLLER • RHEOSTAT

  10. EQUIPMENT LIST(ACTUATOR) • Jack ball screw $400 ~7inches/sec @200lbs • Motor and coupling needed

  11. DIVISION OF LABOR Chiao Liu: • Micro-controller to hardware interface • Protection circuitry • H-bridge connections • Hardware and Software debugging Brandon Nayden: • H-bridge drive circuitry • All Software modules • Hardware and software debugging

  12. DISCUSSION OF HARDWARE 4N25 OPTICAL ISOLATORS • PROTECTION PURPOSE • VOLTAGE DRIVE FOR IR2213

  13. DISCUSSION OF HARDWARE IR 2213 HIGH LOW DRIVER • Drive for H-bridge transistors

  14. IR2213 Combined with H-bridge Each IR2213 drives the high and low side of H-Bridge

  15. H-Bridge and Motor Direction Forward direction of motor H – Bridge driven by IR2213

  16. H-Bridge and Motor Direction H – Bridge driven by IR2213 Reverse direction of motor

  17. IR2213 Typical Connection

  18. IR2213 Bootstrap Circuit Cbs = 10uF Cdc = .1uF

  19. IR2213 Inputs Vdd = 18v Vss = ground H(in) = L(in) = 0 to 18v Vcc= 18v SD(shutdown)=ground Vs to load COM = ground

  20. IR2213 Outputs LO = 0 to 18v HO = 0 to 18v above H-bridge supply

  21. HARDWARE TESTING IR2213 switching H-Bridge

  22. HARDWARE TESTING IR2213 switching H-Bridge

  23. HARDWARE CONFIGURATION

  24. DISCUSSION OF HARDWAREPower CalculationsIRF640 120V motor 4 amp motor rated current = 2.4 W Without heat sink • Delta T ~ 149 degrees C With heat sink • Delta T ~ 53 degrees C

  25. SOFTWARE DISCUSSION • 14 Modules • Timer 2 Mode 0 • External interrupts for port 4 output • Liquid crystal display and keypad implementation • Feedback input from actuator • Digital control system

  26. COMPLETED WORK • Searched for appropriate linear actuator and platform configuration • Searched for appropriate motor and motor drive • All hardware design and implementation • Initial software design and implementation

  27. COMPLETED WORK • Bi-directional actuator movement • User interface for actuator control • Display of current direction and duty cycle

  28. COMPLETED WORK • Forward and reverse direction • Various duty cycles • Position feedback allows actuator to change direction without user input

  29. TASKS ‘NOT’ COMPLETED • Hardware implementation with 120 volt DC motor • Build Test Platform with appropriate linear actuator • Digital control software implementation - Ensures proper output at various loads

  30. QUESTIONS ?

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