3) Operating Description
(1) HDC (Hill Descent Control) System Operating Conditions
HDC is operable only when the conditions below are met:
When HDC switch is turned ON
Gearshift lever position (Forward/Reverse)
Automatic transmission: operates in any position except for P (parking) or N (neutral) positions.
When not depressing the accelerator pedal or brake pedal.
The vehicle speed is above 7 km/h (in Automatic transmission/4H mode).
a.
b.
c.
d.
Speed available in HDC mode (slope)
2H/4H mode: vehicle speed below 50 km/h
(operation slope level: 10%, termination slope level: when it reaches 8%)
2H/4H mode: vehicle speed below 50 km/h
(operation slope level: 8%, termination slope level: when it reaches 5%)
HDC target speed in 2H/4H mode
(The HDC target speed is the speed that the HDC is not terminated even after the vehicle
speed reaches 7 km/h, but is converted to the stand-by mode. When the vehicle speed
increases again as a result of the increase of the road steepness, etc., the HDC goes into
operation.)
Forward driving: 7 km/h
Reverse driving: 7 km/h (automatic transmission), 8.5 km/h (manual transmission)
A.
-
-
B.
-
-
Vehicle position control function in ESP and HBA function are not in operation:
The HDC is the device to improve the engine brake effect during downhill driving on a steep hill.
If the ESP function is in operation, HDC operation is overridden.
e.
-
-
The gradient of downhill should be over 10%.
When the gradient of downhill exceeds 10%, the HDC operates until the vehicle speed reaches
speed 7 km/h.
The HDC returns Ready status when depressing the accelerator pedal or brake pedal during its
operation. When releasing the pedal, the HDC resumes the operation. Therefore, the driver can
control the vehicle speed as desired.
f.
-
-
When depressing the accelerator pedal or brake pedal, HDC system is changed to stand-by
mode. When depressing the accelerator pedal again, HDC starts its operation again. Therefore,
drivers can control the vehicle speed to a desired level by operating the accelerator pedal.
-
When the slope level is between 10% and 20% during the HDC operation
When the slope level exceeds 20% during the HDC operation
The vehicle conditions in Step (d) are subject to the vehicle driving conditions. Refer to below:
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