Wheel Angle Sensor; No Wheel Angle Sensor; Speed Sensor - Danfoss PVED-CLS User Manual

ENGINEERING TOMORROW
sensors are absent, then the FDA can be disabled, to avoid PVED-CLS from going into safe state (refer chapter 14, for
details on FDA). Furthermore, if the system is an OSPE/EHi-E or EHi-H system, the Cut-off valve must also be connected
as a boot-up check is done on the Cut-off Valve presence.
Note: The system requires an MMI installed for changing programs, steering devices and steering modes etc.
For further information regarding sub-system requirements, please see the Danfoss document, PVED-CLS Safety Manual.
For further information regarding protocol requirements, please see the Danfoss document, PVED-CLS Communication
protocol.
8.1

WHEEL ANGLE SENSOR

The PVED-CLS can interface with either single/dual channel analogue wheel angle sensor or dual channel CAN based
wheel angle sensor, but can also be configured to no wheel angle sensor present.
Wheel angle sensor can be configured by parameters WAS interface (P3244) and Redundant WAS present (P3245).
The wheel angle sensor allows the PVED-CLS to perform closed loop position control on the steered wheels of the
vehicle, auto-guidance steering, anti-drift function as well as soft end stop features.
Important
Recommended WAS specification:
WAS on CAN = 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.
8.1.1

No Wheel angle sensor

If no wheel angle present in the system, parameter P3244 i.e. WAS interface shall be set to NONE. In this case, PVED-
CLS cannot perform closed loop control of the steered wheels, so auto-guidance or closed loop AUX joystick is not
possible. In addition, anti-drift and soft end-stop is impossible. When wheel angle sensor is disabled, the following
parameters must be set according to Table 22.
Parameter Name
When WAS interface (P3244) == NONE
STW anti-drift - Max flow correction in percentage of full flow
AUX anti-drift - Max flow correction in percentages of full flow
Valve type
GPS present
GPS2 present
If AUX present (P3239) == TRUE, then
AUX type
If these rules are not followed, PVED-CLS will enter safe state.
8.2

SPEED SENSOR

Many of the PVED-CLS's safety functions are relying on a safe and trustworthy vehicle speed signal. The PVED-CLS is
performing crosschecks on the vehicle speed signal, therefore it is also required to send (on the CAN bus) two independent
vehicle speed signals (e.g. from two sensor sub-systems).
52 | © Danfoss | August 2018
Address Description of parameter
P3569 Max flow correction which can be requested by the EFU algorithm
P3705 Max flow correction which can be requested by the EFU algorithm
Valve type on which the PVED-CLS is mounted
P3081
Valid Values: 0 (OSPE, EHi); 1 (EHPS)
GPS Present/Not Present
P3237
Valid Values: 0 (NOT PRESENT); 255 (PRESENT)
GPS2 Present/Not Present
P3238
Valid Values: 0 (NOT PRESENT); 255 (PRESENT)
Aux device is mini steering wheel or Joystick
P3240 Valid Values: 0 (Open Loop Joystick); 1 (Closed Loop Joystick); 2
(mini steering wheel); 3 (Analogue Joystick);20 (Elobau joystick)
Table 22
Expected
Unit
Value
0 %
0 %
0 -
0 -
0 -
≠1
-
AQ00000211