RAM CHASSIS CAB 2024, Руководство пользователя

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Activating HDC
Once HDC is enabled it will activate automatically if
driven down a grade of sufficient magnitude. The set
speed for HDC is selectable by the driver, and can be
adjusted by using the gear shift +/-. The following sum-
marizes the HDC set speeds:
HDC Target Set Speeds
•
P = No set speed. HDC may be enabled but will not
activate.
•
R = 0.6 mph (1 km/h)
•
N = 1.2 mph (2 km/h)
•
D = 0.6 mph (1 km/h)
•
1st = 0.6 mph (1 km/h)
•
2nd = 1.2 mph (2 km/h)
•
3rd = 1.8 mph (3 km/h)
•
4th = 2.5 mph (4 km/h)
•
5th = 3.1 mph (5 km/h)
•
6th = 3.7 mph (6 km/h)
•
7th = 4.3 mph (7 km/h)
•
8th = 5.0 mph (8 km/h)
•
9th = 5.6 mph (9 km/h) – If Equipped
NOTE:
During HDC the +/- shifter input is used for HDC target
speed selection, but will not affect the gear chosen by
the transmission. When actively controlling HDC, the
transmission will shift appropriately for the driver-
selected set speed and corresponding driving
conditions.
Driver Override
The driver may override HDC activation with throttle or
brake application at any time.
Deactivating HDC
HDC will be deactivated but remain available if any of
the following conditions occur:
•
Driver overrides HDC set speed with throttle or
brake application.
•
Vehicle speed exceeds 20 mph (32 km/h) but
remains below 40 mph (64 km/h).
•
Vehicle is on a downhill grade of insufficient magni-
tude, is on level ground, or is on an uphill grade.
•
Vehicle is shifted to PARK.
Disabling HDC
HDC will be deactivated and disabled if any of the fol-
lowing conditions occur:
•
The driver pushes the HDC switch.
•
The driveline is shifted out of 4WD Low.
•
The parking brake is applied.
•
The driver door opens.
•
The vehicle is driven greater than 20 mph
(32 km/h) for greater than 70 seconds.
•
The vehicle is driven greater than 40 mph
(64 km/h) (HDC exits immediately).
•
HDC detects excessive brake temperature.
Feedback To The Driver
The instrument cluster has an HDC icon and the HDC
switch has an LED icon, which offers feedback to the
driver about the state HDC is in.
•
The cluster icon and switch lamp will illuminate and
remain on solid when HDC is enabled or activated.
This is the normal operating condition for HDC.
•
The cluster icon and switch lamp will flash for sev-
eral seconds then extinguish when the driver
pushes the HDC switch but enable conditions are
not met.
•
The cluster icon and switch lamp will flash for sev-
eral seconds then extinguish when HDC disables
due to excess speed.
•
The cluster icon and switch lamp will flash when
HDC deactivates due to overheated brakes. The
flashing will stop and HDC will activate again once
the brakes have cooled sufficiently.
WARNING!
HDC is only intended to assist the driver in controlling
vehicle speed when descending hills. The driver must
remain attentive to the driving conditions and is
responsible for maintaining a safe vehicle speed.
Hill Start Assist (HSA)
HSA is designed to mitigate roll back from a complete
stop while on an incline. If the driver releases the brake
while stopped on an incline, HSA will continue to hold
the brake pressure for a short period. If the driver does
not apply the throttle before this time expires, the sys-
tem will release brake pressure and the vehicle will roll
down the hill as normal.
The following conditions must be met in order for HSA
to activate:
•
The feature must be enabled.
•
The vehicle must be stopped.
•
The parking brake must be off.
•
The driver door must be closed.
•
The vehicle must be on a sufficient grade.
•
The gear selection must match vehicle uphill direc-
tion (i.e., vehicle facing uphill is in forward gear;
vehicle backing uphill is in REVERSE gear).
SAFETY 227
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