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

ENGINEERING TOMORROW
Important
If anti-drift is not needed, the function can be disabled by setting P3705 to 0.
Name
AUX anti-drift - Max
flow correction in P3705 U8
percentages 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. 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 (
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 (
to minimize the jerks in the system.
© Danfoss | August 2018
Description of parameter
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
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.
) curve.
Table 44
) in Figure and more smoother ramps will be applied
Range
OEM 0 100
OEM 1 160
AQ00000211 | 103
15
20