Fleet Maintenance - 27

Eaton's Dr. Dorobantu.
"Cruise points went down from 1,400 rpm
to 1,100 rpm," Dr. Dorobantu explains. "That is
significant downsizing of the engine, and that
has implications of lower friction. You need
to make the engine more robust; automation
protects the driveline better against misuse and
increases the safety."
Turbo compounding
While turbo compounding
has traditionally been seen
as a means to increase engine
performance, it can also help
to improve fuel efficiency.
Turbo compounding is a
waste heat recovery method
designed to recirculate the
exhaust gases back into the
system through the use of a
power turbine. This recirculation of gases can provide an
additional boost of power to
the engine, while also limiting the exhaust emitted from
the vehicle.
"The turbo compound
engine is designed to create
more power with less energy,"
explains John Moore, product
marketing manager, commercial vehicle OEM Volvo Trucks
North America (VTNA).
VTNA manufactures Volvo
Trucks and Mack Trucks. Both
brands can be specified with
Volvo engines, mated with the
company's proprietary I-Shift
transmission.
Turbos are another system
added to the vehicle, so they
inherently make the system
more complex. Manufacturers
have taken strides to help
simplify the system and make
improvements.
Historically, the drawbacks of a turbo compound
engine would be that more
fuel is used for the turbo
compounding process - but
improved precision with the
fuel injection process, as
mentioned earlier, has helped
to limit the use of fuel. Add
to that, advancements in
system software have helped
to better optimize the use
of the turbo compounding
functionality.
Volvo recently introduced
its second generation of turbo
compounding engine, the
D13TC, to provide additional
fuel efficiency benefits. The
newest iteration provides
greater PM reduction and an
increased compression ratio
to improve fuel efficiency,
says Moore. "Less soot from

the cylinder increases exhaust gas recirculation
and exhaust aftertreatment system reliability,"
he adds.
"In order to truly maximize fuel efficiency,
Volvo Trucks recommends pairing the D13TC
engine with the appropriate [drivetrain] for the
specific application," Moore adds. "Aerodynamic
features can also have a considerable impact on
the overall efficiency of the truck. Additionally,

a maximum trailer gap should be set close to 44
inches for best fuel efficiency."
Engine turbochargers also have a direct impact
on the performance of the engine braking system.
"Engine power can be increased through a
variety of methods," says Navistar's Nachtman.
"Higher boost from the turbocharger puts more
air into the engine, allowing the engine brake to
make more brake horsepower."

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VehicleServicePros.com/21014302

October 2019 | VehicleServicePros.com

27


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Fleet Maintenance

Table of Contents for the Digital Edition of Fleet Maintenance

Uptime: Are all systems secure?
Cover Story: Connecting to the future
Vehicles: Engine trends impacting performance and fuel efficiency
In the Bay: Understanding tire pressure monitoring and management systems
Shop Operations: How fleets can benefit from RCM
Management: Are you a good global citizen?
Economic Outlook: WDTKAWDTKI?
Powertrain: What are fault code action plans, and how can they help improve the vehicle diagnostic process?
Braking & Collision Avoidance: How will electric vehicles impact commercial truck braking systems?
Fleet Parts & Components
Tools & Equipment
Classifieds
Guest Editorial: Differences servicing air disc brakes versus drum brakes
Fleet Maintenance - 1
Fleet Maintenance - 2
Fleet Maintenance - 3
Fleet Maintenance - 4
Fleet Maintenance - 5
Fleet Maintenance - 6
Fleet Maintenance - 7
Fleet Maintenance - Uptime: Are all systems secure?
Fleet Maintenance - 9
Fleet Maintenance - Cover Story: Connecting to the future
Fleet Maintenance - 11
Fleet Maintenance - 12
Fleet Maintenance - 13
Fleet Maintenance - 14
Fleet Maintenance - 15
Fleet Maintenance - 16
Fleet Maintenance - 17
Fleet Maintenance - 18
Fleet Maintenance - 19
Fleet Maintenance - Vehicles: Engine trends impacting performance and fuel efficiency
Fleet Maintenance - 21
Fleet Maintenance - 22
Fleet Maintenance - 23
Fleet Maintenance - 24
Fleet Maintenance - 25
Fleet Maintenance - 26
Fleet Maintenance - 27
Fleet Maintenance - 28
Fleet Maintenance - 29
Fleet Maintenance - 30
Fleet Maintenance - 31
Fleet Maintenance - 32
Fleet Maintenance - 33
Fleet Maintenance - In the Bay: Understanding tire pressure monitoring and management systems
Fleet Maintenance - 35
Fleet Maintenance - 36
Fleet Maintenance - 37
Fleet Maintenance - 38
Fleet Maintenance - 39
Fleet Maintenance - 40
Fleet Maintenance - 41
Fleet Maintenance - 42
Fleet Maintenance - 43
Fleet Maintenance - Shop Operations: How fleets can benefit from RCM
Fleet Maintenance - 45
Fleet Maintenance - 46
Fleet Maintenance - 47
Fleet Maintenance - 48
Fleet Maintenance - 49
Fleet Maintenance - Management: Are you a good global citizen?
Fleet Maintenance - Economic Outlook: WDTKAWDTKI?
Fleet Maintenance - Powertrain: What are fault code action plans, and how can they help improve the vehicle diagnostic process?
Fleet Maintenance - 53
Fleet Maintenance - Braking & Collision Avoidance: How will electric vehicles impact commercial truck braking systems?
Fleet Maintenance - 55
Fleet Maintenance - Fleet Parts & Components
Fleet Maintenance - 57
Fleet Maintenance - 58
Fleet Maintenance - 59
Fleet Maintenance - 60
Fleet Maintenance - 61
Fleet Maintenance - Tools & Equipment
Fleet Maintenance - 63
Fleet Maintenance - 64
Fleet Maintenance - 65
Fleet Maintenance - 66
Fleet Maintenance - 67
Fleet Maintenance - 68
Fleet Maintenance - 69
Fleet Maintenance - 70
Fleet Maintenance - 71
Fleet Maintenance - 72
Fleet Maintenance - Classifieds
Fleet Maintenance - Guest Editorial: Differences servicing air disc brakes versus drum brakes
Fleet Maintenance - 75
Fleet Maintenance - 76
Fleet Maintenance - I1
Fleet Maintenance - I2
Fleet Maintenance - S1
Fleet Maintenance - S2
Fleet Maintenance - S3
Fleet Maintenance - S4
Fleet Maintenance - S5
Fleet Maintenance - S6
Fleet Maintenance - S7
Fleet Maintenance - S8
Fleet Maintenance - S9
Fleet Maintenance - S10
Fleet Maintenance - S11
Fleet Maintenance - S12
Fleet Maintenance - S13
Fleet Maintenance - S14
Fleet Maintenance - S15
Fleet Maintenance - S16
Fleet Maintenance - S17
Fleet Maintenance - S18
Fleet Maintenance - S19
Fleet Maintenance - S20
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