Transcript Final Present THIS ONE 5-2 - Electrical and Computer Engineering

The Electric
Vehicle
www.ece.drexel.edu/ev/
Presented by:
Keith Kolkebeck
Ben McGrath
Mike Rehrman
Advisor:
Dr. Scoles
Project 4
Overview
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Background
Why an EV?
Accomplishments
High & low voltage systems
Instrumentation
Conversion Cost
Future work
Background
• 1984 Honda CRX EV
– Donated to Drexel
University Electrical
Vehicle Team
– Majority of mechanical
systems complete for
original design
– Majority of electrical
systems complete, but
incorrectly installed
Goals
• Assess and rewire high/low
voltage systems
• Test high/low voltage systems
• Assess original batteries
• Electrical instrumentation and
data acquisition
• Road test the EV
Mike Rehrman
Why an EV?
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Environmentally friendly
Ideal for cities or local use
Low maintenance
$0.044 per mile ($0.07 for gas)*
* Formula taken from Bob Brant. Built Your Own Electric Vehicle. McGraw-Hill, Inc. 1994.
Accomplishments
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Assessed high voltage
Assessed and rewired low voltage
New batteries
Documentation
Installed electrical instrumentation
– Cruising Equipment’s E-meter
– Indicator lights
– Low voltage analog meters
High Voltage System
• Located a good reference
diagram*
• Verified the installed wiring
• Produced high voltage diagram
of Drexel’s EV
• Batteries on order, not received
* Page 93 of Michael P. Brown’s Convert It. Future Books. 1993.
Components
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10 12-Volt Trojan 27TMH batteries
9” Advanced D.C. Motor
Curtis PMC potbox
Curtis PMC motor controller
200A Breaker
K&W Engineering BC-20 battery
charger with LB-20 line booster
• Albright Contactor
Charger &
Booster
10 12-Volt Trojan 27TMH Batteries
200A
Breaker
Overheat
Light
Curtis PMC Controller
9” D.C. Motor
Charging
Light
Charging
• Minimum charger
requirements:
– 120-volt AC source
– 20 Amps
• Approximate full
charge time of 8
hours
• Interlock relay
Batteries
• Trojan 27TMH deep discharge
batteries
• Weight 55 lbs each
• Need to be replaced every 3-4 years
Keith Kolkebeck
Low Voltage System
• Determined wired improperly
• Completely rewired low voltage
system
• Integrated the OEM low voltage
system (lights, horn, etc…)
• Tested system
Components
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Sevcon DC-to-DC converter
12-Volt auxiliary battery
Ignition switch
OEM 12-volt electrical system
Key relay
Potbox relay
Interlock relay
Indicator lights
Analog voltmeter and ammeter
Vacuum pump with switch
Safety
• Key Switch Relay
– Allows 120V input to the DC-DC
converter
• Potbox Relay
– Turns on Controller when
accelerator pressed
• Interlock Relay
– Prevents operation during charging
12V Aux.
Battery
Key Switch
Tripped
Key
Relay
Key On
OEM 12V System
Ammeter
Running
Light
Voltmeter
Pressed
Potbox
Sevcon DC-DC
Converter
Potbox
Relay
Tripped
Ben McGrath
E-Meter
• Monitors
– voltage
– current
– amp-hours
consumed
– time remaining
• Programming
E-meter Setup
Current
Serial Port
Shunt
Power
High Voltage
Prescaler
500V
Serial Communication
• RS-232 data link
– Computer
– Palm Pilot *
• Output data file
• Analysis data
– Matlab
– Excel
*Application written by Peter Ohler
Conversion Cost
Item
Cost
1984 Honda CRX chassis
9” Advanced DC Motor
CurtisPMC Motor Controller
CurtisPMC Potbox
Albright Contactor
Current Shunt
Cruising Equipment E-meter w/ 500V
Sevcon DC/DC Converter
K&W Battery Charger
K&W Battery Charger Booster
Power Brake Vacuum Pump
50mV Shunt
10-12-volt Trojan THM Batteries
Car relocation
Miscellaneous
$1,150.00
$1,623.00
$906.00
$77.00
$165.00
$22.75
$300.00
$580.00
$675.00
$195.00
$285.00
$30.00
$833.30
$155.00
$300.00
Total Cost
$7,297.05
Future Work
• Comprehensive road test
• Data collection and analysis for
various driving conditions
• Installation of heater core with
temperature controls
Special Thanks
• Dr. Scoles - Advisor
• Peter Ohler – Palm Pilot E-meter
application
• Jim Le/Dan Lump – Trojan
Battery
Pictures
Questions