Mack CHM 2010, Руководство оператора

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116 OPERATION
Maximum Engine Speed Limit
This mode allows the maximum engine speed (RPM) to be limited, based on preprogrammed
speeds, when PTO or Electronic Hand Throttle (EHT) controls are engaged. The engine will
not operate beyond these speeds when the control (PTO or EHT) is engaged. The operator
has no control over this operation, and cannot change or override these preset limits.
Vehicle Limiting Speed
These programmable modes allow the maximum vehicle speed to be restricted to a
preprogrammed speed limit. The driver has no control over this operation, and cannot
change or override these preset limits. Another feature of the vehicle limiting speed function
is “Lower Gear Road Speed Limit Feature Activation.” This option, when selected, will
limit vehicle speed in gears below top gear to a value less than the top gear road speed limit.
The purpose of this option is to encourage the operator to operate the vehicle in top gear,
where the optimum fuel economy can be achieved.
There are two programmable “top gear” Vehicle Limiting Speeds — one for cruise and the
other for use with the accelerator pedal (AP).
Vehicle Limiting Speed can also be limited to separate values for each power takeoff (PTO).
Note:
The vehicle limiting speed in cruise control mode can be lower or equal to the vehicle
limiting speed in accelerator pedal mode.
High Acceleration Control
Under light load, high vehicle acceleration conditions, the maximum engine acceleration
may be limited to prevent wheel slippage. Engine speed (RPM) will be limited to a value
just above the rated speed of the engine.
This condition should not prevent the driver from shifting to the next gear. If the engine is
limited, it is an indication that wheel slippage conditions may be present and that the driver
should drive less aggressively under these lightly loaded conditions.