Danfoss pved-cl, Operation Manual, Page: 41 / 116

1000
1000 -1000
-1000
750 500
250
-500 -750 -250
-750
-500
-250
250
500
750
Saturation
Saturation
Qm
Lx
CL - port
CR - port
Sts
Example
Lx=10
Qm=-750
V - scaled steering
wheel speed: 1 unit
= 0.1% of Max
activation
Max input signal
for activating the
steering device
CW
Max input signal
for activating the
steering device
CCW
Qr - r
equest
ed p
or
t flo
w
:
1 unit = 0.1% of M
ax p
or
t flo
w
P005 203E
Defaults
Lx=0
Qm =1000
Lx affects the inherent linearity between steering actuator speed and steering wheel speed. The set value
affects the linearity of a second order function. Increase Lx to achieve slower cylinder speed at low
steering wheel RPMs and consequently higher cylinder speeds at higher steering wheel RPMs. The
default value gives a linear relationship between steering wheel RPM and cylinder speed.
Qm sets the maximum port flow. It defines the maximum achievable cylinder speed for steering left and
right. The default value is set to maximum flow and thus dependent on the maximum flow of the applied
valve.
Symbol Index Default Value range
Lx 1y06 0 -10 max regressive, 0 (linear) to 10 (max progressive)
Qm 1y27 1000 0 to 1000 (100% flow at CL or CR port)
Steering Sensitivity
Sensitivity is set individually for each program and can be either fixed or variable. Sensitivity can depend
on vehicle speed, steered wheel position, or change of current device program. Using variable sensitivity
can increase comfort and controllability significantly, and depending on the vehicle type and use, the
appropriate way to achieve the change might be different. The PVED-CL allows 10 different programs for
the steering wheel steering with different sensitivity settings. Each program can be applied via the MMI
while driving. Each program can then use either fixed or variable sensitivity – hence we talk ‘second-
order-variability’ by using the PVED-CL.
Min Sts = 20
0 100 200 300 400 500 600 700 800 900 1000
340
360
380
400
420
Vesm = 500
Vehicle speed
Ve = Vehicle speed: 1 unit = 0.1 km/h
Fixed sensitivity – program 0
Sts0 Sts1 Sts2 Sts3
Sts4 Sts5
Vehicle speed dependant
(non-linear) – program 2
Vehicle speed dependant
(non-linear) – program 3
Vehicle speed dependant
(linear) – program 1
Max Sts = 1200
Operation Manual
PVED-CL Controller for Electro-Hydraulic Steering, Version 1.38
Steering by Steering Wheel – Open Loop
© Danfoss | May 2016 11025583 | AQ00000216en-US0302 | 41