Open Loop Anti-Jerk - Danfoss PVED-CLS User Manual

ENGINEERING TOMORROW
Important
If anti-drift is not needed, the operator can disable the function by setting P3705 to 0.
Name
AUX Anti-drift - Max
flow correction in P3705 U8
percentage of full flow
AUX Anti-drift - Max
Steering wheel drift P3706 U16
correction

11.6 OPEN LOOP ANTI-JERK

Jerk is a common unpleasant feeling/phenomenon which can be experienced on large, articulated vehicles. To
minimize these jerks, the PVED-CLS has a built-in anti-jerk algorithm which can be enabled and parameterized by the
operator. The anti-jerk function applies to all AUX Open Loop steering devices.
Briefly, the Anti-jerk algorithm has two sets of parameters to choose from, one set for when moving away from neutral
position and one set for moving towards neutral position.
CalculatedFlowSetpoint_IR
Anti-jerk function
Flow Command
Neutral
1 2
10ms 10ms
Description of parameter
Max flow correction which can be requested by the EFU algorithm.
% If anti-drift is not needed, the operator can disable the function by
setting P3705 to 0
The difference between the observed and ideal AUX steering angle at
Deg which and above which the max. EFU correction ("AUX Anti-drift - Max
flow correction") shall be applied.
Anti-jerk function AdjustedFlowSetpoint_IR
3 4 5 6 7
Table 42
Soft-stop Requested flow set-point
Absolute, out; (P3703)
Absolute, in; (P3701)
Relative, out; (P3700)
Relative, in; (P3699)
8
Figure 40
Range
OEM 0 100
OEM 1 180
Flow to spool pos
Spool pos. Set-point
conversion
Absolute, out (changed from
absolute in, due to crossing neutral)
Relative, out (changed from
relative in, due to crossing neutral)
Adjusted flow set point
Flow command to PVED-CLS
Ramps
cancelation
Control loop
15
20