Select A Fixed Sensitivity; Select A Sensitivity With Relation To Actuator Position - Danfoss pved-cl Operation Manual

Operation Manual
PVED-CL Controller for Electro-Hydraulic Steering, Version 1.38
Steering by Steering Wheel – Open Loop

Select a Fixed Sensitivity

Symbol
Vcap
StrkVol
Sse
Sts0
A steering ratio of 400 equals to 4.00 steering wheel turns to move the steering actuator from YL to YR (left to right end-lock position)

Select a Sensitivity with Relation to Actuator Position

42 | © Danfoss | May 2016
A note on variable steering ratio:
In systems with an EHPS valve, the sensitivity settings yield equivalent steering ratio results on the
physical steering system.
In systems with an EH valve, the software does not take the parallel flow contribution from the OSP into
account. Unless compensated for, the resulting steering ratio on the physical steering system will be
lower than expected. To compensate, increase the sensitivity parameters and optionally limit the
maximum flow (Qm) to achieve the desired steering ratio for the used steering programs.
Vcap holds information about the actual valve capacity. This information is needed by the software to
achieve the desired sensitivity.
StrkVol holds information about the actual stroke volume (cylinder size). This information is needed by
the software to achieve the desired sensitivity.
Sse selects between a fixed steering sensitivity, variable to steering actuator position or vehicle speed.
Set Sse to 1 to select the fixed sensitivity
Sts0 defines the fixed steering ratio. This value shall be set large enough to provide sufficient directional
stability at all vehicle speeds. The default value is set to a commonly applied steering ratio.
Index Default
706 25
707 600
1y09 1
1y10 400
A variable steering sensitivity related to actuator position is normally chosen for increased controllability
for straightforward driving (for e.g. material handling applications). The correlation between steering
wheel movements and the cylinder position is normally closely related to the mechanical geometry
between steering actuator and steered wheels of the individual vehicle.
max Sts = 1200
420
Sts0=400
400
380
360
340
Straight forward driving position
min Sts = 20
0
100 200 300
Yact - Steering actuator position: 1 unit = 0.1% of max position
The correlation is defined by two parameters. The steering sensitivity between two table coordinates is
found by linear interpolation. The functionality is symmetrical around neutral.
Vcap holds information about the actual valve capacity. This information is needed by the software to
achieve the desired sensitivity.
StrkVol holds information about the actual stroke volume (cylinder size). This information is needed by
the software to achieve the desired sensitivity.
Value range
5 to 120 (l/min)
100 to 8000 (cm3)
Must be set at 1
20 to 1200
Sts saturates
(Yact)
Sts1=400
400 500 600 700 800 900 1000
P005 091E
11025583 | AQ00000216en-US0302