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STARTING AND DRIVING
ALLISON TRANSMISSION
maintaining higher engine speed,
resulting in increased engine braking or
engine brake performance during
downhill operation or vehicle
deceleration cycles. However, preselect
shifts are permitted only if an engine
overspeed condition will not occur after
completion of the downshift.
NOTE
Preselecting during normal operation may
result in reduced fuel economy.
Performance/Economy Shift
Schedules
Currently, Allison Transmission offers the
following commonly available shift
schedules:
• S1 & S5 Performance: WOT upshifts
near Full Load Governed Speed
(FLGS).
• S2 & S6 Performance: WOT upshifts
at a fixed (less than 100) percent of
FLGS.
• S3 & S7 Economy: Upshifts at
speeds which pull engine down to a
fixed rpm after the shift.
• S4 & S8 Economy: Upshifts at
speeds which pull engine down to a
fixed rpm (and less than S3) after the
shift.
• S9 Economy: Upshifts and
downshifts occur at speeds that are
even lower than the S4 shift strategy.
• SA Economy: WOT upshifts are
similar to S1 & S5. The SA part-
throttle upshifts and downshifts
occur at significantly lower speeds
than the S5 part-throttle shifts.
• SB Economy: WOT upshifts and
downshifts similar to SA. The SB
part-throttle upshifts occur at slightly
higher speeds than the SA part-
throttle upshifts.
• SC Economy: WOT upshifts are
similar to S3 & S7. The SC part-
throttle and closed-throttle upshifts
and downshifts are similar to the SA
part-throttle and closed-throttle
shifts.
• SD Economy: WOT upshifts and
downshifts similar to S3 & S7. The
SD part-throttle and closed-throttle
upshifts and downshifts are similar
to the SB part-throttle and closed-
throttle shifts.
Schedules S1 through S4 are typically
used with engines using variable speed
or all-speed governors. The differences
between the schedules is typically close
to full throttle. Schedules S5 through S8
are designed to provide the same WOT
upshifts as the corresponding S1
through S4 schedules. However, the S5
through S8 part throttle shift schedules
have been modified.
Non-Engine Brake Operation
Two choices of preselect shift schedules
are available for governing preselected
downshifts during normal transmission
operation. One of the following choices
is selected when the Transmission
Control Module (TCM) is programmed
by the dealer or truck manufacturer:
• Standard Preselects – downshifts
occur so the engine speed after the
shift is approximately 300 rpm above
the engine governed speed
• Low Preselects – downshifts occur
so the engine speed after the shift is
approximately 150 rpm above the
engine governed speed
Engine Brake Operation
When the Transmission Control Module
(TCM) detects the engine brake is
enabled, it commands use of a preselect
shift schedule in order to enhance
engine brake performance. The default
speeds for these shifts are known as the
Alternate Engine Brake Preselects.
• Alternate Engine Brake Preselects –
downshifts occur at engine speeds
approximately midway between
1000 rpm and the Standard
160
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Содержание M359
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