Danfoss PVED-CLS User Manual page 85

ENGINEERING TOMORROW
A set of parameter consist of a relative set-point change parameter (P3700 or P3699 measured in [%]) and an Absolute
set-point change parameter (P3703 or P3701 measured in [IR]).
For the relative set-point parameters, the value will change depending on the actual spool position. For the Absolute
set-point change parameters, the value will always be a fixed set-point value. The algorithm will choose the parameter
(absolute or relative) which has the highest change of set-points for each loop (i.e. 10ms).
If the EH-spool is commanded to go from left- to right-side or opposite, when crossing neutral, the ramps will be
position
Important
An anti-jerk function is normally only used on articulated vehicles, where jerk is very common.
-the- -feature, further dampen of AUX speed fluctuations can be done. So if the general AUX Anti-jerk
setup (P3699 to P3703 and P3714 to P3718) does not give the operator a sufficient dampening/satisfying result, the
anti-jerk on-the-top function can be enabled.
Anti-jerk
Flow command
Anti-jerk on-the-top
Flow command
Flow command1
As per default, P3714 and P3716 are both set to 10. Having these parameters set to the same value cancel out any
crossover ramping. To enable the function, set P3714 and P3716 to a value between 0 and 1000 to indicate the
crossover start (P3714) and crossover stop (P3716). Furthermore, the low pass filter in the function is configurable
(P3718 default 10Hz i.e. P3718 set to 100).
Base Anti-jerk algorithm
Flow command1
Average Average flow command
LPF
LPF flow command
STW Anti-jerk Cross-over start (P3714)
STW Anti-jerk filter Cut-off STW Anti-jerk Cross-over stop (P3716)
frequency (P3718)
EEPROM parameters
moving towards neutral position
Anti-jerk on-the-top
For dampen STW speed
fluctuations
Flow command
Crossover
Crossover
P3714
100%
0%
|average flow command|
Out = Factor LPF flow command x LPF flow command + Factor flow command x flow command
Figure 41
moving away from neutral
Flow command
P3716
Factor LPF flov command
Factor flow command