Danfoss PVED-CLS, Руководство пользователя, Страница: 55 / 182

© Danfoss | August 2018 AQ00000211 |
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ENGINEERING TOMORROW
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Steered wheels characteristics (air pressure, dimension) needs to be according to the normal operation conditions.
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It needs to be ensured that the wheel angle sensors mechanical installation is fixed in such a way that there is no
mechanical backlash, e.g. full fixation and alignment of WAS.
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Load on vehicle is allowed during calibration, but it needs to be assured that maximum steering pressure during calibration
routine is <80% of Relief valve setting (e.g., Relief valve setting of 200bar, max steering pressure during calibration:
160bar).
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It needs to be ensured that the steering valve is supplied by sufficient oil flow during the calibration routine.
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Before any calibration routine is started, it has to be assured that all air has been bled from the steering system. This can be
obtained by turning the steering wheel fully left, fully right minimum 10 times. Thereafter no abnormal noise or vibration
should occur when steering.
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Any calibration should be performed on an on-road surface (i.e. unpainted concrete or asphalt). Danfoss recommends not
to perform calibration on ice-surface, off-road-surface (mud, dirt etc.) or a painted, sticky surface. The vehicle should not
be lifted from the ground during calibration.
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The WAS shall be calibrated prior to spool calibration
Important
Danfoss recommends to test and qualify the valve auto-calibration parameters for any vehicle series.
Attention
When performing calibration, the wheels will be moving. Make sure that there’s no bystanders or that bystanders are
aware of the upcomming calibration routine and the moving wheels.
9.1 WHEEL ANGLE SENSOR CALIBRATION
As per default, a PVED-CLS will boot-up in WAS calibration service mode if P3244 i.e. WAS interface is set to either
analogue or CAN. From here either WAS auto-calibration routine from the Danfoss PLUS+1 SERVICE TOOL can be
used or a manual WAS calibration can be performed (see 17.6).
General guidelines:
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WAS on CAN = minimum 1000 counts full scale from full left to full right. Noise less than 3% full scale
WAS analogue = minimum 3V bandwidth full left to full right. Noise less than 3% full scale.
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The wheel angle sensor output must remain inside the range from 0.5VDC to 4.5VDC to keep clear of short
circuit detection thresholds.
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Danfoss recommends that the manual calibration of any wheel angle sensors is done with the PVED-CLS in
“WAS calibration service mode”
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For applications other than auto guidance, WAS resolution from 20 to 45 deg/volt will provide adequate results
Furthermore; at every startup, the PVED-CLS validates the CAN wheel angle calibration data (for CAN WAS) and
Analogue Sensor calibration data (for analogue WAS) sectors;
For the “CAN Wheel Angle Sensor sector” (see 17.4.4) this means that:
P3185 < P3189 < P3187 or P3185 > P3189 > P3187; if this validation fails, PVED-CLS will enter “Wheel Angle Sensor
calibration”, but only if WAS type is set to CAN (i.e. P3244 set to 1).
For the “Analogue Wheel Angle Sensor” (see 17.4.5) this means that:
P3205 < P3209 < P3207 or P3205 > P3209 > P3207 and P3211 < P3215 < P3213 or P3211 > P3215 > P3213; if this
validation fails, PVED-CLS will enter “Wheel Angle Sensor calibration”, but only if WAS type is set to Analogue (i.e.
P3244 set to 0).
Important