freightliner WALK-IN VAN CHASSIS Operator's Manual page 128

Hydraulic Hybrid
03/22/2011
1. Gearbox Fluid Filter
Fig. 16.6, Gearbox Fluid Filter
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03/31/2011
1. Gear Pump
Fig. 16.7, Gear Pump
engine, through the gearbox, to pressurize hydraulic
fluid for storage in the accumulator, and maintain the
desired state-of-charge. The primary pump is also
used to transfer fluid to the secondary pump to pro-
pel the vehicle.
In motoring mode, the pump is driven by the high-
pressure fluid stored in the accumulator to drive the
gearbox to start the engine.
16.5
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2. Gearbox
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04/04/2011
1. Primary Pump
2. Secondary Pump
Fig. 16.8, Location of the Primary and Secondary High
Pressure Pumps
The secondary pump is also used as either a pump
or motor. In motoring mode, the pump is driven by
high-pressure fluid from the primary pump or the fluid
stored in the accumulator to drive the gearbox to pro-
pel the vehicle.
During regenerative braking, the rear wheels drive
the secondary pump to pressurize fluid for storage in
the accumulator. This action works to slow the ve-
hicle.
Hybrid Control Module (HCM)
The HCM, shown in Fig.
service panel in the floor of the cargo area, and con-
trols all hybrid drive system functions.
Transmission Control Module (TCM)
The TCM is located below the service panel in the
floor of the cargo area. It is situated underneath the
bulkhead connector and interfaces with most of the
vehicle's electronics. See
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3. Gearbox
16.9, is located below the
Fig. 16.9.
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