506
Model Code Page
37. Autocontrol 5.2 (K41107---)
1. 8. 2000
371 4
6250--8950
C. Automatic speed change of DPS (Au-
toDPS)
1. Auto2 --function
AutoDPS Auto2 function has been changed so that the
automatic gear change occurs at adjusted engine revs. The
limit revs can be adjusted as follows:
--- ensure that the shuttle lever is in the neutral position
--- switch on Auto2 with the rocker switch
--- press for one second DPS ---preprogramming button
After this the present change---down limit revs are blinking
in the display and the black arrow downwards is blinking.
The blinking revs can be stepped with DPS push buttons at
intervals of 50 rpm in both directions. The limit revs for the
change---down can be altered between 900---2300 rpm.
After the change---down limit revs are correctly set, press
the DPS---preprogramming button after which the limit revs
for change---up starts to blink in the display and the black
arrow upwards is flashing. Also these revs can be stepped
at intervals of 50 rpm.
The limit revs for change---up can be adjusted between
1000---2400 rpm and it must be at least 100 rpm bigger
than the change---down revs.
When the change---up limit revs are correctly set, press the
DPS---preprogramming button after which the set revs func-
tion as limit revs in the Auto2 function.
The adjusted limit revs remain in the memory although the
current is switched off. Factory values of the limit revs are
1400 and 2100 in normal tractors and 1100 and 1700 in low
rev tractors.
Note! While the limit revs setting mode is activated, the
control unit does engage neither driving direction (R or F). If
the driving direction is tried to engage during setting, the
indication arrow of the direction in question is flashing, but
the direction is not engaged. After this the direction can not
be engaged until the setting is completed and the parking
brake is engaged. After the parking brake has been enga-
ged, the control unit is in the normal function.
The following digital inputs affect the function:
d01=DPS---push button up
d02=DPS---push button down
d07=AutoDPS rocker switch Auto1 and Auto 2
d08=DPS auto/manual
d09=Direction F (forward driving selected)
d10=Direction R (rearwards driving selected)
d11=DPS---preprogramming button
d16=parking brake
The following frequency input:
F1=engine rotation speed sensor
The switches and sensors can be checked in the test mode
FII.
If the input signals are OK, but malfunctions appear, the
fault can lie in the control unit of AC 5.2.
2. Speed Matching of DPS
The Speed Matching is one part of the AutoDPS function.
With the aid of the speed matching the DPS speed is chan-
ged automatically to a best suitable speed in connection
with the mechanical gear change.
The function is active, when:
--- AutoDPS is switched on (auto1 or auto2) and
--- tractor is in motion and
--- either driving directions is on.
When these terms come true, the speed matching is acti-
vated and it remains on until one of the following terms co-
mes thrue:
--- AutoDPS is switched off (Man position) or
--- tractor is stopped
When the speed matching is activated, the control unit ob-
serves whether one of the following terms comes thrue:
--- H i S h i f t --- bu t ton is pr e s s e d o r
--- clutch pedal is depressed or
--- selected driving direction (F or R) is switched off
If one of the above given terms comes thrue, the control
unit measures immediately the input frenquency from sen-
sors F4/F5 (F4
in the beginning), and with the aid of these inputs
the control unit calculates the comparison values.
When the driving direction is switched on again (HIShift
button is released, clutch pedal is released or driving direc-
tion is reselected), the control unit measures the frequency
from sensors F4/F5 at this moment (F4
in the end).
This measured frequency is compared with the comparison
values and the control unit is carried out an automatic DPS
speed change (the automatic speed change can be one or
two step up or down), if the measured frequency is above
or below the calculated limit values.
The control unit changes first the DPS speed and after this
engages the traction (shuttle). If there is no need to change
the DPS speed, the traction engages immediately.
Note! During the automatic speed change can happen that
it is not possible to change two steps up or down (e.g DPS
speed II is selected and the speed matching should be two
steps upwards). In this case the speed matching is one
step up.
The following digital inputs affect the function:
d03= H i S h i f t --- bu t t on
d06=Clutch pedal limit switch
d07=AutoDPS rocker switch Auto1 and Auto 2
d08=DPS auto/manual
d09=Direction F (forward driving selected)
d10=Direction R (rearward driving selected)
The following frequency inputs:
F2=gearbox speed (driving speed)
F4=reverse shuttle speed (upper sensor)
F5=reverse shuttle speed (lower sensor)
The switches and sensors can be checked in the test mode
FII.
If the input signals are OK, but malfunctions appear, the
fault could be in the control unit of AC 5.2.
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