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1 Doc Title | Confidential | 2017-05-08Confidential | 2017-05-08
Pascal Fillion, Eng. PMP
Chief Project Manager
HOLISTIC APPROACH TO THE
ELECTRIFICATION OF A 500HP RATED
POWERTRAIN IN COMMUTER EXPRESS
COACHBUS & PARATRANSIT CONFERENCE
MAY 8 2017
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PREVOST IS PART OF THE VOLVO GROUP FAMILY
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OTHER FAMILAR IMAGES
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THE OBJECTIVE OF ELECTRIFICATION
Maximum uptime
Easy maintainability
Efficiency
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THE CONDITIONS
Long range trips
Urban driving
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A DELICATE BALANCE
Increased
Electrification
level
Technology
readiness
Up-time &
autonomy
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TECHNOLOGY AWARENESS
Technology readiness level (TRL)
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THE STARTING POINT: A PROVEN PLATFORM
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ENERGY MANAGEMENT FOR SYSTEM ELECTRIFICATION
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More Potential
for energy recovery
increasedelectrical
generation
Adapted energy storage
better fuel economy
Increased electrification
level
THE ELECTRIFICATION CYCLE
Energy
efficiency
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WHERE WAS THE BEST OPPORTUNITY??
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INTRODUCTION OF ELECTRIC FAN COOLING SYSTEM
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STRONG DIGITAL VALIDATION PLAN
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STRONG PHYSICAL VALIDATION
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WINTER TESTING
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HIGH AMBIENT OPERATING CONDITIONS
Normal driving
Wide open throttle upgrade
Downgrade with retarder
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Reliability Program
9 test units
Over 500 000 miles
5 SW generations
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THE RESULT
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SIMPLE SYSTEM – EFFICIENT AND EASILY MAINTAINED
Red and Yellow fans in 2
Independent circuits
Each fan is
individually protected
Fans controled in
speed
CAC and Radiator fans work separately
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SYSTEM DIAGNOSTICS
▪ Cooling fans keep record of
overheating history
▪ All fans are reset (homing) at startup
for status check
▪ The radiators are kept automatically
clean by the fan operation logic
▪ Automatic fan Reversing at startup and
depending of the season.
▪ Minimal cleaning is needed
▪ Radiator can be accessed by opening
the fan panel
▪ Simple visual diagnostics can be
performed without tools
▪ From front instruments menu and
straight visual inspection
▪ If needed a much deeper
investigation can be performed.
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THE RESULT -
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KEY TAKEAWAYS
It takes a lot of hard work to make something simple.
(Steve Jobs)
The integration effort resulted in a
simple system with easy
maintenance.
The strong collaboration with the
engine manufacturer resulted into
reduced operation cost
A solid validation plan with a 500hp
in mind makes the system reliable in
any kind of conditions and maximizes
up-time
.
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▪ Come see our coach outside
▪ Engineering experts: Christophe Lemarechal & Jeff Gagné
