Danfoss pved-cl, Руководство по эксплуатации, Страница: 99 / 116

Reduced State
The PVED-CL contains functionality that allows the system architect to set up a “graceful degradation”
behavior if e.g. a sensor faults should occur. The overall objective is to sustain the machine up-time and
to allow the driver to finish the mission with as much steering performance as possible.
Faults on the following sensors can be configured to allow the PVED-CL to enter reduced state:
•
High Priority (HP) steering device faults
•
Low Priority (LP) steering device faults
•
Vehicle speed sensor faults
•
Steered wheel angle sensor faults
IS
SWAReducedModeAllowed OR
VSReducedModeAllowed OR
HPSTLReducedModeAllowed OR
LPSTLReducedModeAllowed
= TRUE ?
Fault state
Is
fault related to
HP steering device OR
LP steering device OR
Vehicle speed sensor OR
Steered wheel angle sensor ?
start
Operation state
Reduced state
Fault detected
No
Yes
No
Yes
Power off
Reduced Steering Functionality
The steering functionality in reduced state is dependent on which of the allowed faults are present as
presented below.
High Priority Steering Device Fault
HPSTDReducedModeAllowed parameter indicates to the PVED-CL error handler, that any fault related
to the High priority steering device shall bring the PVED-CL into reduced state and change the high
priority steering device functionality as follows:
•
High priority steering device disabled
•
High priority steering device enable not possible (see High Priority Steering Device Enable/Disable
Control on page 75)
Symbol Index Default Value range
HPSTDReducedModeAllowed 64013 0 0 (FALSE), 255 (TRUE)
The parameter controls both analogue and CAN based steering devices.
‘False’ infers that the PVED-CL will enter fault state if a fault occurs.
The high priority steering device faults that can trigger reduced state can be found in J1939 Diagnostic
Interface on page 102.
Low Priority Steering Device Fault
LPSTDReducedModeAllowed parameter indicates to the PVED-CL error handler, that any fault related
to the Low priority steering device shall bring the PVED-CL into reduced state and change the Low
priority steering device functionality as follows:
•
Low priority steering device disabled
•
Low priority steering device enable not possible (see Low Priority Steering Device Enable/Disable
Control on page 92)
Operation Manual
PVED-CL Controller for Electro-Hydraulic Steering, Version 1.38
Reduced State
© Danfoss | May 2016 11025583 | AQ00000216en-US0302 | 99