Acquire The Signals; Set-Point Transfer Function - Danfoss pved-cl Operation Manual

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

Set-point Transfer Function

78 | © Danfoss | May 2016
SseSts0,Sts1,Sts2,
Sts3,Sts4,Sts5, Vesm
100 ms
Ve -Vehicle
Steering
speed
sensitivity
10 ms
Yact - Actuator
position
Transfer
10 ms
Xstl - Joystick
signal
function
Qm,Lx,db

Acquire the Signals

See Mapping a Steering Device
angle sensor.
The transfer function provides 3 parameters to transfer joystick inputs signal to requested port flow.
CR - port
Example
db=100, Lx=10
Qm= -750
Sts=116
Max input signal
for activating the
steering device
into the left
direction or
CCW
-1000 -750 -500
Defaults
db=50, Lx=0
Qm =1000
Sts=105
Saturation
Db Sets a dead-band in the middle region of the steering input. It prevents self-steering caused by
manufacturing deviations in the signal when the handle is in the middle or released position.
The default value is set twice the maximum deviation of most spring returned steering devices.
Lx Effect the inherent linearity between steering actuator speed and steering angle. The set value is set
down when slower cylinder speed at larger steering angles is required.
The default value will not effect the resulting relation.
Qm Limits the maximum cylinder speed for steering the vehicle in the right steering direction. (See set-
point transfer function above)
The default value is set equal to the inherent max port flow capacity of the valve and will therefore not
have any effect.
Sr, Lr, Tro, Tfo, Lf,
Trh, Tfh, YsetFr, Tfr,
TAbortDownRamp, Cf, Off
Tra, Verm
Yr,Yl
Ramp Soft
function stop
Yact
Ve
Actuator
Vehicle
100 ms
position
speed
on page 31 on how to map the steering wheel sensor and steering wheel
1000
Saturation
750
500
Lx
250 Sts
-250 250 500
750
Xstl - input signal:
-250
1 unit = 0.1% of
db
Max activation
-500
-750
CL - port
-1000
Q
Port flow
command
10 ms
P005 207E
Qm
Max input signal
for activating the
steering device
into the right
direction or CW
1000
P005 210E
11025583 | AQ00000216en-US0302