© 2005-2016 Nira Control AB 112
Ignitions or injections are blocked, this is named cut throughout this
document. The parameter FlatShift Cut Mode determines which of
them that will be blocked
A combination of the two is also possible and often used.
The torque reduction is maintained during x ms or as long as the switch is
activated. FlatShift Mode controls whether the torque reduction is
maintained for a given time or as long as the switch is activated.
To make the return to normal mode smoother, the cut and ignition angle is
gradually phased back to normal. This part is named ramp up. During the
ramp up period the ignition is phased back to normal, i.e. Ignition Main
Table sets the ignition angle, and the “cut” goes to zero which means that
no ignitions/injections are blocked.
In order to make it possible to activate the function, the rpm and throttle
position must be above certain values. This is done to prevent the engine
from stalling when changing gear at low rpm or give to much engine brake
while downshifting. The parameters Flatshift Min Rpm and Flatshift Min Tps
are determining the thresholds.
6.9.1 Flatshift Enable
States if the function is enabled or not.
6.9.2 Flatshift Mode
States how the function decides when the ramp up should begin. This is
done in one of two ways:
”Time”, ramp up is commenced after FlatShift_Active_Time
”Switch”, ramp up is commenced when the FlatShift switch goes
inactive, as longest FlatShift_Active_Time
FlatShift_active_time change meaning from time for torque reduction to
maximum time for torque reduction.
6.9.3 Flatshift Active Time
Sets the time for torque reduction, i.e. the time until the ramp up begins. If
FlatShift mode is “switch” this parameter set the maximum time that the
torque reduction is allowed to be active.
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