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Steering by High Priority Steering Device – Open Loop
EHPS Type 2 System Diagram
Q
Steering
cylinder
EHPS Valve
Automatic steering
OSP
PVE
Steering angle sensor
Position
sensor
P005 225E
Vehicle speed
Joystick or mini wheel
Steering
cylinder
EHPS valve
OSP
PVE
Q
High
priority
Functionality Tree
The tree below illustrates the availability of the PVED for steering by joystick, mini wheel with speed
output or by potentiometer-like steering devices. The manufacturing default functionality is found by
following the red line. Following the instructions in this chapter can of course modify the default. The
switches in the tree are used to select the functionality required. In case different functionalities are
required, the EHPS software provides 5 programs from which the driver can select when the system is
fully operative.
P005 202E
Open loop, fixed sensitivity, with no ramps
applied.
Closed loop, fixed sensitivity
Closed loop
Cp=255
Related to
vehicle speed
Sse=3
Fixed
Sse=1
Open loop, fixed sensitivity, with fixed ramp times,
Fixed
Sse=1
Related to
position of
steering actuator
Sse=2
Related to
vehicle speed
Sse=3
Open loop, sensitivity related to steering actuator
position, with fixed ramp times
Open loop, sensitivity related to steering actuator
position, no ramps applied
Open loop, sensitivity related to vehicle speed,
with fixed ramp times
Open loop, sensitivity related to vehicle speed,
no ramp times applied
Open loop
Cp=0
Fixed
Sr=1
Var
Sr=2
C
on
tr
ol pr
inciple swit
ch
Sensitivit
y swit
ch
R
amp swit
ch
Open loop, fixed sensitivity, with variable ramp
times as function to vehicle speed,
Open loop, sensitivity as function to steering actuator
position, with variable ramp times related to vehicle
speed,
Open loop, sensitivity related to vehicle speed,
with ramp times related to vehicle speed
Closed loop, sensitivity related to vehicle speed,
switches
No signal (0)
CAN (255)
C
hannel mapping swit
ch
Cp
Sse
Sr
No,
Sr=0
default
Fixed
Sr=1
Var
Sr=2
No,
Sr=0
Fixed
Sr=1
Var
Sr=2
No,
Sr=0
* Sensitivity means: number of revolutions on steering wheel from lock to lock
*
Y=0
1
2
3
4
Program number: Y
Select the Control Principle
The PVED-CL provides open loop control for steering devices with spring return or for steering devices
with a speed output,. This control principle keeps a fixed or variable relation between steering input and
cylinder speed. The control loop provides several parameters to transform positional information to port
flow.
Cp selects the open-loop control using parameter index 3y02 equal to 0 (default). Y selects the program
and ranges from 0 and 9.
Operation Manual
PVED-CL Controller for Electro-Hydraulic Steering, Version 1.38
Steering by High Priority Steering Device – Open Loop
60 |
©
Danfoss | May 2016
11025583 | AQ00000216en-US0302