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 Steering Wheel – Open Loop
Symbol
Vcap
StrkVol
Sse
Sts0
Sts1
See Mapping a Steering Device on page 31.
Steering actuator Sensor (feedback from vehicle wheels)
Steering actuator position to acquire "steering actuator position".

Select a Sensitivity with Relation to Vehicle speed

© Danfoss | May 2016
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 straight
forward. When the steering actuator signal unintentionally is not mapped, Sts(Yact) will be equal to Sts0,
since variable Yact remains 0.
Sts1 sets the linear gradient between steering angle and requested port flow for steering at with the
minimum turning radius.
Index Default
706 25
707 600
1y09 1
1y10 400
1y11
Variable steering sensitivity related to vehicle speed is normally used to optimize steering controllability
at higher driving speeds. The parameter values and correlation is normal closely related to the present
vehicle dynamics of the individual vehicle model.
The correlation is defined by seven parameters. All Sts-parameters may be set equal to each other or
monotonically increasing for higher vehicle speeds. The steering sensitivity between two table
coordinates is found by linear interpolation. The relation is equal for negative speeds.
max Sts = 1200
420
example
Sts1=400
400
380
360
340
min Sts = 20
0
100 200 300 400
Ve = Vehicle speed: 1 unit = 0.1 km/h
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 3 to select the sensitivity related to vehicle speed.
Sts0 sets the steering ratio when the vehicle is standing still. Sts0 applies at all times when the vehicle
signal unintentionally is not configured as PRESENT (Ve remains 0). In case the vehicle speed signal is not
diagnosed, it is recommended to set Sts0 at a value where sufficient directional stability at maximum
vehicle speed is present. The default value is set to a value which yelds good controllability at high
vehicle speeds.
Sts1 sets the steering ratio when the vehicle is driving at 6.25% of Vesm.
Sts2 sets the steering ratio when the vehicle is driving at 12.50% of Vesm.
Value range
5 to 120 (L/min)
100 to 8000 (ccm)
Must be set at 2
20 to 1200
Vesm=500
Sts saturates
(Ve)
500 600 700 800 900 1000
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