Download ACTIVE SUSPENSION TEST PLATFORM

ACTIVE SUSPENSION
TEST PLATFORM
BY
BRANDON NAYDEN
&
CHIAO LIU
ADVISED BY:
STEVEN GUTSCHLAG
TABLE OF CONTENTS
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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
IN P U T
KEYP A D
LC D
M IC R O C O N TR O LLER
FEED B AC K
FGBH
D
OUTPUT
P O W ER
E L E C T R O N IC S
TES T
P LA TFO R M
O UTPUT
INPUTS/OUTPUTS
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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
$400
~7inches/sec
@200lbs
 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
Micro-controller
 PROTECTION
PURPOSE
 VOLTAGE DRIVE
FOR IR2213
Optical
Isolator
Optical
Isolator
DISCUSSION OF HARDWARE
Optical
Isolator
Optical
Isolator
IR 2213 HIGH
LOW DRIVER
 Drive
for H-bridge
transistors
HighLow
Driver
HighLow
Driver
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 = 10uF
Cdc = .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
IRF640 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 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