Steering By High Priority Steering Device - Open Loop; Functionality Tree; Select The Control Principle - Danfoss pved-cl Operation Manual

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

Functionality Tree

Select the Control Principle

60 | © Danfoss | May 2016
EHPS Type 2 System Diagram
Joystick or mini wheel
High
priority
OSP
OSP
PVE
EHPS valve
PVE EHPS Valve
Automatic steering
Vehicle speed
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.
*
switches Cp Sse
Related to
position of
steering actuator
Related to
vehicle speed
Open loop
Cp=0
No signal (0)
Closed loop
Cp=255
CAN (255)
default
* Sensitivity means: number of revolutions on steering wheel from lock to lock
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.
Steering angle sensor
Q
Q
Steering
Steering
cylinder
cylinder
Position sensor
P005 225E
Sr
Open loop, fixed sensitivity, with fixed ramp times,
Fixed
Sr=1
Var Open loop, fixed sensitivity, with variable ramp
Sr=2 times as function to vehicle speed,
No,
Open loop, fixed sensitivity, with no ramps
Sr=0
Fixed applied.
Sse=1
Open loop, sensitivity related to steering actuator
Fixed
position, with fixed ramp times
Sr=1
Open loop, sensitivity as function to steering actuator
Var
position, with variable ramp times related to vehicle
Sr=2
speed,
Sse=2
No,
Open loop, sensitivity related to steering actuator
Sr=0
position, no ramps applied
Open loop, sensitivity related to vehicle speed,
Sse=3
Fixed with fixed ramp times
Sr=1
Open loop, sensitivity related to vehicle speed,
Var
Sr=2 with ramp times related to vehicle speed
No,
Open loop, sensitivity related to vehicle speed,
Sr=0
no ramp times applied
Fixed
Closed loop, fixed sensitivity
Sse=1
Related to
Closed loop, sensitivity related to vehicle speed,
vehicle speed
Sse=3
Program number: Y
4
3
2
1
Y=0
P005 202E
11025583 | AQ00000216en-US0302