© Danfoss | August 2018 AQ00000211 | 103
Important
If anti-drift is not needed, the function can be disabled by setting P3705 to 0.
Name
Description of parameter
Range
Safety critical
parameters ‘S’
flow correction in
P3705 U8 %
Max flow correction which can be requested by the EFU algorithm.
If anti-drift is not needed, the function can be disabled by setting P3705 to
OEM 0 100 15
steering wheel drift
P3706 U16 Deg
The difference between the observed and ideal AUX steering angle at
which and above which the max. EFU correction ("AUX Anti-drift - Max
flow correction") shall be applied.
OEM 1 160 20
Table 44
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. 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.
In the Figure 3 below, point S1 shows the current spool position and S2 shows the calculated flow command to PVED-
CLS. The point Sa1, Sa2 and Sa3 shows adjusted flow set-points after applying anti-jerk algorithm. When the spool is at
point S1 and when there is jerk in the system, the flow set-point S2 is calculated and is expected to reach S2 in one cycle
which is shown by dotted line ( ) curve.
The anti-jerk algorithm calculates the ‘adjusted flow set-points’ Sa1, Sa2 and Sa3 based on relative or absolute set-point
changes in one cycle i.e. in 10 ms which is shown by line ( ) in Figure and more smoother ramps will be applied
to minimize the jerks in the system.
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