ACTIVE SUSPENSION TEST PLATFORM BRANDON NAYDEN & CHIAO LIU BY 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  COMPLETED WORK  QUESTIONS

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

FUNCTIONAL DESCRIPTION  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

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

FINAL PLATFORM CONFIGURATION

LOW LEVEL SYSTEM BLOCK DIAGRAM

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

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

EQUIPMENT LIST (ACTUATOR)  Jack ball screw $ lbs  Motor and coupling needed

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

DISCUSSION OF HARDWARE 4N25 OPTICAL ISOLATORS  PROTECTION PURPOSE  VOLTAGE DRIVE FOR IR2213

DISCUSSION OF HARDWARE IR 2213 HIGH LOW DRIVER  Drive for H-bridge transistors

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

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

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

IR2213 Typical Connection

IR2213 Bootstrap Circuit Cbs = 10uFCdc =.1uF

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

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

HARDWARE TESTING IR2213 switching H-Bridge

HARDWARE TESTING IR2213 switching H-Bridge

HARDWARE CONFIGURATION

DISCUSSION OF HARDWARE Power Calculations IRF V 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

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

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

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

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

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

QUESTIONS ?