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66 | © Danfoss | August 2018 AQ00000211
ENGINEERING TOMORROW
9.4.1 Initial setup
WAS:
The function works by capturing the leftmost, rightmost and straight ahead position of the wheels. The function will learn
the relationship between the AD/CAN values of the WAS for the whole steering band (from leftmost position to rightmost
position) and scale this into an internal resolution in steps of 0.1% for the steering (leftmost to straight ahead and straight
ahead to rightmost).
Joystick:
The function works by capturing the leftmost, rightmost and neutral position of the Analogue Joystick. The function will
learn the relationship between the analogue sensor values of the joystick for the whole joystick position range (from
leftmost position to rightmost position) and scale this into an internal resolution in steps of 0.1% for the joystick position
(leftmost to straight ahead and straight ahead to rightmost).
Spool:
This function allows the determination of the spool dead-band based on inputs and demands from the operator. The spool
dead-band is determined (within given inputs) by measuring the duration of moving the spool continuously from left to
right.
The function is intended to be an alternative solution for spool calibration for mass production environments where a large
number of vehicles is produced and a quick automated spool calibration is needed. The function can provide a precise
dead-band calibration of the spool in a relatively short time (depending on the parameter setup) without having an operator
directly involved.
Before starting any auto-calibration, the parameters in the sector “Auto-calibration Config” shall be studied, as these are
important to get the desired setup on the vehicle.
Auto-calibration Config
Name
A
ddr
es
s
D
at
a t
yp
e
U
ni
t
Description of parameter
U
se
r
Range
D
a
nf
o
ss
de
fa
ul
t
val
u
e
S
a
fet
y
cri
ti
ca
l
p
a
ra
m
et
ers
‘
S
’
Mi
n
.
M
ax.
Analogue sensor
calibration - Max
allowable analogue
sensor signal to be
captured in neutral
P3791 U16 mVolts
Maximum allowed signal to be captured for neutral position during
Analogue sensor auto-calibration
OEM, Dealer 0 5000 4500
Analogue sensor
calibration - Min voltage
needed in between the
captured analogue
sensor values
P3793 U16 mVolts
Determines the minimum voltage needed in between the captured
Analogue sensor voltage (minimum, neutral and maximum), to ensure a
sufficient high analogue signal resolution during Analogue sensor auto-
calibration.
OEM, Dealer 0 2500 0
Analogue sensor
calibration - Min
allowable analogue
sensor signal to be
captured in neutral
P3795 U16 mVolts
Minimum allowed signal to be captured for neutral position during
analogue sensor auto-calibration.
OEM, Dealer 0 5000 500
Spool calibration - Max
closed loop dead-band
edge
P3797 U16 x10u Meter
Maximum closed loop dead-band value (for both left- and right-side),
hence the found dead-band values needs to be in between P3799 and
P3797.
OEM, Dealer 0 300 300
Spool calibration - Min
closed loop dead-band
edge
P3799 U16 x10u Meter
Minimum closed loop dead-band value (for both left- and right-side), hence
the found dead-band values needs to be in between P3799 and P3797.
OEM, Dealer 0 300 0
Spool calibration -
Activation timeout
P3801 U8 -
The time window the user has to start the spool auto-calibration (i.e. to
press the “Start Calibration” button) after the steering wheel has been
activated and the motion has stopped again
OEM, Dealer 1 60 20
Spool calibration -
Initial spool position
P3802 U16 x10u Meter
The initial spool position value, the spool auto-calibration function will
start at. The higher set-point, the faster the wheels movement will be.
Recommend: 115 for OSPE/EHi; 200 for EHPS
OEM, Dealer 50 300 125
Spool calibration - +/-
turn range sweep
P3804 U16 dDeg
This is the +/- turn range sweep where the auto-calibration function will
measure the time for when moving the spool from left to right and right to
left.
Resolution: 1 dDeg 1 = 0,1°.
OEM, Dealer 5 400 25