Select A Sensitivity With Relation To The Actuator Position; Select A Sensitivity With Relation To Vehicle Speed - Danfoss pved-cl Operation Manual

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

Select a Sensitivity with Relation to the Actuator Position

Symbol Index
Sse 3y09
Sts0 3y10
Sts1 3y11
See chapter Mapping steering signals, Steering actuator Sensor (feedback from vehicle wheels) and Steering actuator position to acquire "steering
actuator position".

Select a Sensitivity with Relation to Vehicle Speed

© Danfoss | May 2016
A steering sensitivity related to actuator position is normally chosen for increased directional stability for
straightforward driving (material handling). The values & correlation is normally closely related to the
mechanical geometry between steering actuator and steered wheels of the individual vehicle. The
correlation is defined by 2 parameters. The steering sensitivity between two table coordinates is found by
linear interpolation. The relation is equal for negative positions.
max Sts = 1200
120
100
80
60
Straight forward
40
driving position
min Sts = 20
0
100 200 300
Yact - Steering actuator position: 1 unit = 0.1% of max position
Sse Selects between a fixed steering sensitivity, variable to steering actuator position or vehicle speed.
Set Sse to 2 to select the sensitivity related to steering actuator position.
Sts0 Sets the linear gradient between steering angle and requested port flow for steering
straightforward. When the steering actuator signal unintentionally is not mapped, Sts0 will be constantly
used since variable Yact remains 0.
Sts1 Sets the linear gradient between steering angle and requested port flow for steering at the
minimum turning radius.
Default
1
105
90
Variable steering sensitivity related to vehicle speed is normally used to optimize directional stability
automatically and beyond the notice of the driver. The values and correlation is normally closely related
to the present vehicle dynamics of the individual vehicle model. The Sts value is used to amplify the input
signal as described in Set-point Transfer Function
The correlation is defined by seven parameters. All Sts-parameters may be set equal to each other or set
monotonically falling for increasing vehicle speeds. The steering sensitivity between two table
coordinates is found by linear interpolation. The relation is equal for negative speeds.
Sts saturates
(Yact)
400 500 600 700 800 900 1000
P005 098E
Value range
Must be set at 2
20 to 1200 (Amplification of 0.2 to 12.00)
20 to 1200
on page 40 .
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