Danfoss PVED-CLS, User Manual, Page: 56 / 182

56 | © Danfoss | August 2018 AQ00000211
ENGINEERING TOMORROW
If WAS is not configured, i.e. parameter P3244, is set to NONE, the calibration cannot be performed and PVED-CLS will
signal this in the operation status message. For more details on operational status message, please see the Danfoss
document- PVED-CLS communication Protocol.
9.1.1 Automatic adjustment of maximum steer angles and cylinder stroke volume
At wheel angle sensor calibration scenarios, automatic re-calculation of the maximum wheel angle as well as cylinder
stroke can be enabled. This may be useful if the wheel angle range is restricted e.g. by changing from single to twin tires
or vice versa. The PVED-CLS will estimate new values for the maximum steer angle parameters as well as left and right
cylinder stroke volume.
To use the automatic adjustment calculation, the wheel angle sensor characteristics must be mapped into the following 4
lookup tables (Table 24 to Table 27). The PVED-CLS will then calculate new values for the Maximum steer angle, Left
and Right and Cylinder stroke volume, based on the input from the lookup tables.
PVED-CLS supports both to calculate the maximum steer angles and the cylinder stroke volume, but it is also possible
only to calculate the maximum steer angles or the cylinder stroke volume.
The automatic adjusted function will be applied during WAS calibration if minimum one of the following conditions are
met:
•
If P3086 is set to a value > 10000, that forces the PVED-CLS to calculate and use automatic adjusted values
for cylinder stroke volume (i.e. P3191 or P3221 will be updated after WAS calibration, depending on WAS-
type, using linear interpolation in Table 24 and Table 25)
•
If P3426 is set to a value > 89 and if P3428 is set to a value > 89, that forces the PVED-CLS to calculate and
use automatic adjusted values for Maximum steer angle, Left (i.e. P3193 or P3223 will be updated after WAS
calibration, depending on WAS-type, by lookup in Table 26), and forces the PVED-CLS to calculate and use
automatic adjusted values for Maximum steer angle, Right (i.e. P3195 or P3225 will be updated after WAS
calibration, depending on WAS-type, by lookup in Table 27)
Important
PVED-CLS executes EEPROM parameter crosschecks related to automatic calculation of maximum steer angles and
the cylinder stroke volume.
If the automatic adjustment of maximum steer angles and cylinder stroke volume is activated (P3426 & P3428 > 89 deg
and P3086 > 10000ccm) and:
•
Analogue wheel angle sensors are in use, it is required that P
3223 & P3225 ≤ 89 deg and P3221 ≤ 10000 ccm.
• CAN based wheel angle sensors are in use, it is required that P3193 & P3195 ≤ 89 deg and P3191 ≤ 10000
ccm.
If these rules are not followed, PVED-CLS will enter safe state.