System Overview; Ospe System - Danfoss PVED-CLS User Manual

ENGINEERING TOMORROW

System overview

2.1

OSPE SYSTEM

Key off/de-energize
OSP
CAN bus – Steering bus
(Terminate with 120 Ohms in both ends)
SASA-sensor
PVED-CLS
Vehicle speed
sensor
Auto-guidance
MMI
WAS
AUX
PLUS+1 Service
tool
In a standard OSPE with PVED-CLS-system, a wheel angle sensor (Danfoss recommend a redundant sensor as
illustrated on Figure 1, to meet category 3 according to ISO13849) either analogue or CAN-based, a Danfoss SASAIID
sensor and two vehicle speed signals transmitted on the CAN bus (from two independent sources) are prerequisite
in order to get the PVED-CLS up and running. The system also requires an MMI installed (for changing programs,
steering devices, steering modes etc.). Additionally, an auto-guidance controller and an AUXiliary-device (e.g. mini-
wheel, joystick) can be connected to the CAN bus for enabling auto-guidance-steering and AUXiliary-device-
steering.
When the PVED-CLS is mounted on an OSPE the cut-off valve is always present, therefore P3072 needs to be 255 and
the valve type needs to be set to OSPE/EHI by setting P3081 to 0. Furthermore OSP displacement, given in ccm, needs
to be entered in P3084. If the total displacement is unknown, it can be found on the label, located at the end of the
steering unit.
The cylinder stroke volume is also needed, again in ccm. If effective cylinder volume is unknown, count the steering
wheel turns lock-to-lock and multiply by OSP-displacement, to get the effective cylinder volume. The value needs to
be entered in P3086.
Vbat +
Vbat -
(9 ... 32 V )
OSPE-valve
Cut-off
CAN_safety
valve output
Safety
Micro-crontroller
AD1
AD2
AD3 (not used)
5V sensor supply +
Sensor ground -
Main
Micro-crontroller
CAN_Main
Main spool position
Main spool position
Pilot
Pressure
Solenoid Cut-off
valve valve
Vbat-
Pilot
Pressure
Solenoid
valve EH valve
bridge
P T
Figure 1
Cylinder
Wheel angle sensor diagram
+V1 5V sersor supply
Wheel +V2
GND1 Sensor ground -
Angle
GND2
Sensor
OUT1 AD1
OUT2 AD2
LVDT
PVED-CLS