Steering Sensitivity - Danfoss pved-cl Operation Manual

Operation Manual
PVED-CL Controller for Electro-Hydraulic Steering, Version 1.38
Steering by Steering Wheel – Open Loop
Symbol Index
Lx 1y06
Qm 1y27

Steering Sensitivity

© Danfoss | May 2016
CR - port
Example
Lx=10
Qm=-750
Max input signal
for activating the
steering device
CCW
-1000 -750 -500
Defaults
Lx=0
Qm =1000
Saturation
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.
Default
0
1000
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.
Max Sts = 1200
420
400
380
360
340
Min Sts = 20
0 100 200
1000
Saturation
750
500
Lx
250
Sts
-250 250 500
750
V - scaled steering
-250
wheel speed: 1 unit
= 0.1% of Max
activation
-500
-750
CL - port
-1000
Value range
-10 max regressive, 0 (linear) to 10 (max progressive)
0 to 1000 (100% flow at CL or CR port)
Vesm = 500
Vehicle speed dependant
(linear) – program 1
Vehicle speed dependant
(non-linear) – program 2
Fixed sensitivity – program 0
Vehicle speed dependant
(non-linear) – program 3
300 400 500 600 700
Ve = Vehicle speed: 1 unit = 0.1 km/h
Qm
Max input signal
for activating the
steering device
CW
1000
P005 203E
800 900 1000
Vehicle speed
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