Danfoss PVED-CLS - Calibrating CAN-Based Wheel Angle Sensor

172 | © Danfoss | August 2018 AQ00000211
ENGINEERING TOMORROW
• Calculate the sector CRC as CRC-16-CCITT (P3771…P3778) and store (word) at the CRC/Checksum address
(P3789). For example of how to calculate sector CRC, please see paragraph 17.5.2.
Write parameters to PVED-CLS’ EEPROM
• Put PVED-CLS into “bootloader mode”
• For MAIN-controller:
o Write data sector “Analogue Sensor Calibration data”
o Read back data (verification)
o Acknowledge data correctness
o To sign acknowledge, calculate signature CRC and write it at the CRC/signature address (P48)
o Write data sector “Production/Calibration Flag”
• For SAFETY-controller:
o Write data sector “Analogue Sensor Calibration data”
o Read back data (verification)
o Acknowledge data correctness
o To sign acknowledge, calculate signature CRC and write it at the CRC/signature address (P48)
• Calculate the sector CRC as CRC-16-CCITT (P3771…P3778) and store (word) at the CRC/Checksum address
(P3789). For example of how to calculate sector CRC, please see paragraph 17.5.2.
17.6.3 Calibrating CAN-based wheel angle sensor
The following description explains how to manually calibrate your CAN-based wheel angle sensor. The procedure
consists of three main steps:
1. Read sensor values
2. Data sector preparation
3. Write parameters to PVED-CLS’ EEPROM
The following is a more detailed description of each main step:
Read sensor values
• Put PVED-CLS into “WAS calibration service mode”
• Turn wheels into far left angle position
o Read primary wheel angle via CAN message and temporarily store the value
o Read secondary wheel angle via CAN message and temporarily store the value
• Turn wheels into neutral/straight position
o Read primary wheel angle via CAN message and temporarily store the value
o Read secondary wheel angle via CAN message and temporarily store the value
• Turn wheels into far right angle position
o Read primary wheel angle via CAN message and temporarily store the value
o Read secondary wheel angle via CAN message and temporarily store the value
Data sector preparation
• For MAIN- and SAFETY-controller, populate a temporary data sector for “CAN WAS Calibration data”. Use
the temporarily stored values from “main step 1” for the displayed below,
CAN WAS Calibration data