View of steering gear |
1 | Rack-and-pinion steering gear |
2 | Belt drive housing |
A91b1 | Electric power steering torque sensor |
A91m1 | Electric power steering actuator motor |
N68 | Electrical power steering control unit |
P46.35-2050-05
Location
The electrical power steering control unit is attached to the electric power steering actuator motor.
Tasks
The electrical power steering control unit has the following tasks:
Reading in of signals
Evaluation of input factors
Actuation of components
Transmission of requests/information
Reading in of signals
The input factors are read in via the following connections:
Direct line
Chassis CAN 2 (CAN E2)
Direct line
The signals from the following component are read in via a direct line:
Electric power steering torque sensor
Chassis CAN 2
The following signals are read in over the chassis CAN 2:
Torque request for Steer Assist and wheel speeds, from Electronic Stability Program control unit (N30/4) and the electronic ignition lock control unit (N73)
Status of "Engine running", "Drive train operational" and engine speed, from ME-SFI [ME] control unit (N3/10) (with gasoline engine) or from CDI control unit (N3/9) (with diesel engine) via chassis CAN 1 and electronic ignition lock control unit
Steering angle and steering angle rate of change, from steering column tube module control unit (N80) recorded by steering wheel angle sensor (N49) over chassis CAN 1 and the electronic ignition lock control unit
Current status and requested toothed rack position of parking system control unit (N62) (with CODE 220 (PARKTRONIC) or with CODE 235 (Active Parking Assist))
Evaluation of input factors
The input factors which are read in are evaluated by the integrated microprocessor, the relevant components are then actuated and requests/information are output.
Actuation of components
The following component is actuated directly:
Electric power steering actuator motor
Transmission of requests/information
The following requests/information are transmitted via chassis CAN 2:
Request for a warning message by the multifunction display (A1p13) to the instrument cluster (A1)
Steering torque, steering angle rate of change and status of Steer Assist to Electronic Stability Program control unit and the electronic ignition lock control unit
Current status from electrical power steering control unit
Current toothed rack position
Technical data |
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Electrical power steering control unit | ||||
Voltage supply | V | 12 | – | On-board power supply voltage |
Voltage limits | V | 9.0 | – | Lower limit value |
16.0 | – | Upper limit value | ||
Power consumption | mA | 400 | – | Standby |
A | 1...80 | – | Action (depending on steering power) | |
– | – | – | No-load current | |
mA | < 0.3 | – | Maximum quiescent current | |
– | – | – | Minimum no-load current | |
Reverse polarity protection | – | – | – | Yes |
Additional specific parameters | – | – | – | None |
Special features | – | – | – | None |
Flash capability/coding capability | – | – | – | Yes/yes |