Sehs Fda - Danfoss PVED-CLS User Manual

ENGINEERING TOMORROW
17.4.2

SEHS FDA

Name
Fault Detection
Algorithm - Steering
P3122 U8
wheel activation
velocity threshold
Fault Detection
Algorithm – min. wheel
P3123 U8
angle movement
threshold
Fault Detection
Algorithm – wheel angle P3124 U8
sensor delay
Fault Detection
Algorithm - Fault
P3125 U8
confidence counter
decrease rate
Fault Detection
Algorithm - Fault
P3126 U16
confidence counter
timeout
Fault Detection
Algorithm - Spool in left P3128 S16
position range offset
Fault Detection
Algorithm - Spool in
P3130 S16
right position range
offset
Fault Detection
Algorithm - Safe state P3132 U8
upon a failure detection
Fault Detection
Algorithm - Backlash P3133 U8
region
Fault Detection
Algorithm - Vehicle
P3134 U8
speed threshold for
EHPS
150 | © Danfoss | August 2018
Description of parameter
Steering wheel angle velocity threshold used in the Fault Detection
dRpm
Algorithm to detect the steering wheel activation
Minimum wheel angle difference necessary to observe in order to make the
Fault Detection Algorithm assume that the wheels are moving. The
IR
difference is calculated between the current WA position and WA number
of loops back. Number is defined by P3124.
Number of loops between samples that are being compared against P3123
x10mSec
for WA motion determination
Rate at which the Fault Detection Algorithm confidence counter value
x10mSec
decreases if an error is no longer observed
x10mSec Time period for which error shall be observed by FDA to report failure
x10u Meter Distance from closed loop dead-band to check if spool in left side
x10u Meter Distance from closed loop dead-band to check if spool in right side
FDA safe state trigger Enable/Disable after failure detection.
Valid Values: 0 (DISABLE); 255 (ENABLE)
Warning
-
DISABLE should only be used when diagnosis of the wheel angle
sensor and SASA failure modes are ensured by anther monitoring
function or when getting initial data for FDA tuning
Backlash limit to use in the backlash filter in the FDA control algorithm
dDeg exclusively
Resolution: 1dDeg = 0.1Deg
Will disable the FDA and spool monitoring if speed of the vehicle goes
below this value. Should only be changed if EHPS/OSPE/EHi system is
km/h
underpowered, hence the system does not have enough pressure to move
the wheels (normally when vehicle is not moving)
Table 65
Range
OEM 0 150
OEM 0 200
OEM 1 20
OEM 1 10
OEM 0 2000
OEM -200 200
OEM -200 200
OEM 0 255
OEM 0 200
OEM 0 10
AQ00000211
5 S
50 S
1 S
1 S
50 S
0 S
0 S
0 S
5 S
0 S