Predictive Powertrain Control

 

Steep hill

Before moving uphill, PPC decides, like every good driver, whether it makes sense to downshift.

  • The system downshifts and/or increases the speed in order to avoid shifting gear on the hill.
  • In addition, PPC ensures an optimised shifting order (fewer shifts, larger shift steps).

Hill rolling

Why accelerate if rolling suffices? The kinetic energy of the vehicle is continuously determined:

  • The vehicle detects whether it can reach the set speed quickly enough by rolling.
  • EcoRoll can be used in order to avoid drag losses.

Bottom of the hill

PPC can utilise the vehicle’s momentum for a short time.

  • The upper hysteresis (upper limit of set speed range) is exceeded for a maximum of 20 seconds and by a maximum of one kilometre per hour in order to gather even more momentum.
  • Were the vehicle to drive 90 kilometres per hour or more, the upper hysteresis would not be exceeded.

Top of the hill

“Roll over the hilltops to avoid braking when driving downhill”, that’s the principle. The vehicle’s kinetic energy is continuously determined:

  • The truck identifies at an early stage whether it has enough speed to roll over the hilltop.
  • EcoRoll can be used to reduce drag losses.
Speed with/without PPC

Steep hill

The upper hysteresis is utilised in order to avoid shifts.

Steep hill

Speed

Upper hysteresis

Set speed

Lower hysteresis

Distance

with PPC

without PPC

Hill rolling

Coasting is also allowed below the hysteresis range, as the truck also accelerates back to the set speed swiftly enough this way.

Hill rolling

Speed

Upper hysteresis

Set speed

Lower hysteresis

Distance

with PPC

without PPC

Bottom of the hill

Exceeding the hysteresis range is allowed for a short time in order to gather momentum for the incline.

Bottom of the hill

Speed

Upper hysteresis

Set speed

Lower hysteresis

Distance

with PPC

without PPC

Top of the hill

Falling below the set speed up to the lower hysteresis limit is allowed. PPC detects that the set speed can be reached again without accelerating.

Top of the hill

Speed

Upper hysteresis

Set speed

Lower hysteresis

Distance

with PPC

without PPC

Operation via cluster

Operation via cluster.

PPC is switched on and off via the instrument cluster in the menu option Systems. It can be used from a speed of 25 and up to 85 kilometres per hour. In addition to the upper hysteresis, the lower hysteresis limit can be reset. This is a new option in comparison to the cruise control system Tempomat.

  • Upper hysteresis (upper limit of set speed range) Possible setting range: +4 km/h to +15 km/h
  • Lower hysteresis (lower limit of set speed range) Possible setting range: –10 km/h to 0 km/h
EcoRoll

Predictive EcoRoll.

PPC can ensure optimal EcoRoll phases.

  • More precise activation of the EcoRoll mode (much fewer short EcoRolls, much longer EcoRolls).
  • The mode is also activated before hilltops and at the end of the hill below the set speed.
  • The mode is already terminated below braking speed.
  • The mode is not activated if the EcoRoll phase could be too short.

Move the arrow key with the mouse to find out more about how it functions.