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Ve
Vehicle
speed
Xstl - Joystick
signal
Qm,Lx,db
10 ms
100 ms
Ramp
function
Steering
sensitivity
SseSts0,Sts1,Sts2,
Sts3,Sts4,Sts5, Vesm
Ve -Vehicle
speed
100 ms
10 ms
Yact - Actuator
position
Transfer
function
Sr, Lr, Tro, Tfo, Lf,
Trh, Tfh, YsetFr, Tfr,
TAbortDownRamp,
Tra, Verm
Yact
Actuator
position
Q
Port flow
command
Soft
stop
Cf, Off
Yr,Yl
10 ms
P005 207E
Acquire the Signals
See
on page 31 on how to map the steering wheel sensor and steering wheel
angle sensor.
Set-point Transfer Function
The transfer function provides 3 parameters to transfer joystick inputs signal to requested port flow.
1000
1000
-1000
-1000
750
500
250
-500
-750
-250
-750
-500
-250
250
500
750
Saturation
Saturation
Defaults
db=50, Lx=0
Qm =1000
Sts=105
Qm
Lx
db
CL - port
CR - port
Sts
Example
db=100, Lx=10
Qm= -750
Sts=116
Xstl - input signal:
1 unit = 0.1% of
Max activation
Max input signal
for activating the
steering device
into the right
direction or CW
Max input signal
for activating the
steering device
into the left
direction or
CCW
Qr - r
equest
ed p
or
t flo
w
: 1
unit = 0.1% of M
ax p
or
t flo
w
P005 210E
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.
Operation Manual
PVED-CL Controller for Electro-Hydraulic Steering, Version 1.38
Steering by Low Priority Steering Device – Open Loop
78 |
©
Danfoss | May 2016
11025583 | AQ00000216en-US0302