Steering By Low 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 Low Priority Steering Device – Open Loop
Steering by Low Priority Steering Device – Open Loop

Functionality Tree

Select the Control Principle

© Danfoss | May 2016
EHPS Type 2 System Diagram
Joystick or mini wheel
Low
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
Open loop
Cp=0
No signal (0)
AD1 (1)
AD2 (2) Closed loop
Cp=255
CAN (4)
default
* Sensitivity means: Port flow amplification
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 is used to select open loop control for joystick steering by setting parameter index 4y02 equal to 0.
Parameter selection values: Y selects the program and ranges from 0 and 9.
Steering angle sensor
Q
Q
Steering
Steering
cylinder
cylinder
Position sensor
Open loop, fixed sensitivity, with fixed ramp
Sr
times
Fixed Sr=1
Open loop, fixed sensitivity, with ramp times
Var Sr=2
related to vehicle speed
No Sr=0
Open loop, fixed sensitivity, with no
ramps applied
Fixed
Sse=1
Open loop, sensitivity related to steering actuator
position, with fixed ramp times
Related to
Fixed Sr=1
position of
Open loop, sensitivity related to steering actuator
steering
Var Sr=2
position, with ramp times related to vehicle speed
actuator
No Sr=0
Sse = 2
Open loop, sensitivity related to steering actuator
position, with no ramps applied
Related to
vehicle speed
Sse=3
Open loop, sensitivity related to vehicle speed, with
fixed ramp times
Fixed Sr=1
Open loop, sensitivity related to vehicle speed, with
Var Sr=2
ramp times related to vehicle speed
No Sr=0
Open loop, sensitivity related to vehicle speed,
with no ramps applied
Closed loop, Fixed sensitivity, no ramps possible
Program number: Y
4
3
2
1
Y=0
P005 099E
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