Fleet Maintenance - 29

Engine braking improvements
Jacobs Vehicle Systems' Director of Technology,
Robb Janak, explains that in its most basic sense,
a compression release engine brake helps to
improve fuel efficiency simply by reducing the
total drive time. This is because an engine brake
can allow for a higher maximum controlled speed
downhill.
Jacobs Vehicle Systems designs engine retarding systems and valve actuation mechanisms, as well as
provides engine brakes and
emissions solutions to medium
and heavy duty engine makers.
More commonly known as
an engine brake, the system
works by opening the exhaust
valves after a compression stroke to release the
compressed gas in the cylinders. This, in turn, slows the
vehicle.
Updates to engines have
also impacted the design of
the traditional engine brake.
"The engine architecture
completely changed," he
explains, of the evolution of the
engine braking system becoming integrated into the valve
train. "We went from an add-on
the overhead, to an integrated
element within the valve train
in the past 10 to 20 years."
While not a direct impact on
the powertrain system, engine
brakes do help to extend the
life of traditional air brakes.
"The biggest wear you can
put on service brakes is when
you're using them for any long
duration, or anything really
besides a short burst. It (otherwise) raises the temperature
dramatically and wears the
brake pads over time," says
Janak. An engine brake does
not require the use of service
brakes to operate. When using
an engine brake, "you still
have full use of your service
brakes if you need to do an
emergency stop," he adds.

include automation of different vehicle systems,
such as the transmission, and a shift to higher
usage of electronic parts within these systems.
Case in point, Eaton's Dr. Dorobantu notes that
in less than a decade, the industry has seen a
significant shift in the change from manual to
automated manual transmissions (AMTs), with
a 5 percent adoption rate less than a decade ago
to 70 percent today.

"Automation allows the shift to be done effortlessly - the driver doesn't have to care about it
- and that then allows the powertrain to shift
much more often to handle small grades at low
engine speeds and lower power," he says. "From
that perspective, that has been a fuel efficiency
play partially driven by regulations but mostly
driven by the need for long-haul fleets to reduce
fuel consumption."

Integration
considerations
Proper specifications are
integral to the optimized
performance of a vehicle's
engine. This requires a holistic approach that takes into
consideration the entire
powertrain - not only the
engine but also the transmission and axle ratios.
Other areas of the powertrain that have directly impacted the operation of the engine

VehicleServicePros.com/10120810

October 2019 | VehicleServicePros.com

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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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