ACTIVE SUSPENSION ACTIVE SUSPENSION TEST PLATFORMTEST PLATFORM

BRANDON NAYDEN

&

CHIAO LIU

BY

ADVISED BY: STEVEN GUTSCHLAG

TABLE OF CONTENTSTABLE 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 SUMMARYPROJECT SUMMARY To simulate a suspension system for

testing purposes. Actuator driven platform. Simulation for vehicular applications.

FUNCTIONAL DESCRIPTIONFUNCTIONAL 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

SPECIFICATIONSSPECIFICATIONS

Platform velocity of 7 inches/second

Platform load capacity of 200 pounds

User-friendly interfaceSafe environment

FINAL PLATFORM FINAL PLATFORM CONFIGURATIONCONFIGURATION

LOW LEVEL SYSTEM LOW LEVEL SYSTEM BLOCK DIAGRAMBLOCK DIAGRAM

M ICRO-CONTROLLER

KEYPAD

LCD

P OW ERELECTRONICS

TESTPLATFORM

INPUT

OUTPUT

OUTPUT

FGBHD

FEEDBACK

INPUTS/OUTPUTSINPUTS/OUTPUTS

INPUTSINPUTS Direction Duty Cycle Waveform Displacement Position

Sensor

OUTPUTS Platform

Movement Current user

input on liquid crystal display

EQUIPMENT LISTEQUIPMENT LIST(HARDWARE)(HARDWARE)

DC SERVO MOTORS IR2213 HIGH LOW DRIVERS IRF640 TRANSISTORS IRF350 TRANSISTORS 4N25 OPTICAL ISOLATORS LINEAR ACTUATOR MICRO-CONTROLLER RHEOSTAT

EQUIPMENT LISTEQUIPMENT LIST (ACTUATOR)(ACTUATOR)

Jack ball screw

$400

~7inches/sec @200lbs

Motor and coupling needed

DIVISION OF LABORDIVISION OF LABORChiao 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 HARDWAREDISCUSSION OF HARDWARE

4N25 OPTICAL

ISOLATORS

PROTECTION PURPOSE

VOLTAGE DRIVE FOR IR2213

Micro-controller

OpticalIsolator

OpticalIsolator

DISCUSSION OF HARDWAREDISCUSSION OF HARDWARE

IR 2213 HIGH LOW DRIVER

Drive for H-bridge transistors

OpticalIsolator

OpticalIsolator

High-LowDriver

High-LowDriver

IR2213 Combined with H-bridgeIR2213 Combined with H-bridge

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

H-Bridge and Motor DirectionH-Bridge and Motor Direction H – Bridge driven

by IR2213Forward direction of

motor

H-Bridge and Motor DirectionH-Bridge and Motor DirectionH – Bridge driven

by IR2213Reverse direction

of motor

IR2213 Typical ConnectionIR2213 Typical Connection

IR2213 Bootstrap CircuitIR2213 Bootstrap Circuit

Cbs = 10uF Cdc = .1uF

IR2213 InputsIR2213 Inputs

Vdd = 18v

Vss = ground

H(in) = L(in) = 0 to 18v

Vcc= 18v

SD(shutdown)=ground

Vs to load

COM = ground

IR2213 OutputsIR2213 Outputs

LO = 0 to 18v

HO = 0 to 18v above H-bridge supply

HARDWARE TESTINGHARDWARE TESTING

IR2213 switching H-Bridge

HARDWARE TESTINGHARDWARE TESTING

IR2213 switching H-Bridge

HARDWARE HARDWARE CONFIGURATIONCONFIGURATION

DISCUSSION OF HARDWAREDISCUSSION OF HARDWAREPower CalculationsPower Calculations

IRF640IRF640 120V motor 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

SOFTWARE DISCUSSIONSOFTWARE DISCUSSION

14 ModulesTimer 2 Mode 0External interrupts for port 4 outputLiquid crystal display and keypad

implementationFeedback input from actuatorDigital control system

COMPLETED WORKCOMPLETED 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 WORKCOMPLETED WORK

Bi-directional actuator movementUser interface for actuator controlDisplay of current direction and

duty cycle

COMPLETED WORKCOMPLETED WORK

Forward and reverse direction

Various duty cycles Position feedback

allows actuator to change direction without user input

TASKS ‘NOT’ COMPLETEDTASKS ‘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

QUESTIONSQUESTIONS

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