Max.
acceleration and brake curves (.vacc Input File)
Limits vehicle
acceleration and deceleration depending on vehicle speed. If
Look-Ahead Coasting is enabled then
the deceleration is applied in the brake phase.
Input File Format
(comma-separated, dot = decimal-mark):
c vehicle
speed |
Max.
acceleration |
Max.
deceleration |
c [km/h] |
[m/s2] |
[m/s2] |
... |
... |
... |
... |
... |
... |
Note: text
lines (header, comments,
etc.) must start
with "c "
Open file browser.
Open file with
GRAPHi
or an user-defined tool (see
File
Open Command).
Engine
Start/Stop
If enabled the engine will
be turned off after the set
Activation Delay [s] if the following conditions apply:
- Power demand ≤ 0
- Vehicle speed is below Max
Speed [km/h]
- Engine was running for at least Min ICE-On Time [s]
Note:
Currently there is no method available in VECTO to automatically compensate for invalid auxiliary
cycle work when Engine Start/Stop is enabled. This means, if enabled, there might be an error in the total
auxiliary work (compared to operation without Start/Stop). The auxiliary power supply in the driving cycle (see here) must be corrected accordingly.
Overspeed / Eco-Roll
Overspeed
If P
wheel*
< 0: Coasting with brakes not applied for speed < target
speed + allowed overspeed
Parameters:
- Minimum
Target Speed
- Allowed
Overspeed
*Pwheel = Total power demand at wheels

Eco-Roll
If
Pwheel* < 0: Neutral gear, engine idling.
Engine- and service- brake applied
if target speed + allowed overspeed is reached. Eco-Roll deactivates if
target speed + allowed underspeed is reached.
Parameters:
- Minimum
Target Speed
- Allowed
Overspeed
- Allowed
Underspeed
*Pwheel = Total power
demand at wheels
Look-Ahead Coasting
Enables
coasting before each braking phase. Coasting will begin at T seconds
before new lower target speed (see picture below). Braking deceleration
is defined by the
.vacc file.
Look-Ahead Coasting is disabled if target speed is below
Minimum Target Speed.
Parameters:
- Target
Retardation = alookahead
- Minimum
Target Speed
Note: If road
gradient > 0 the coasting deceleration will not be affected,
i.e.
coasting deceleration is calculated for road gradient=0. This should
prevent the vehicle from decelerating too fast. If road gradient
< 0
and P
wheel < 0 coasting is disabled (else
the vehicle would accelerate).
