Description And Operation
DESCRIPTION
OPERATION
On the pinion of the steering box by means of the steering column, the direction desires of the driver are joined. The pinion of the steering box is in direct contact with the rack of the steering box for if the servo assistance is absent, the driver always has the possibility of controlling the vehicle.
Two sensors are located on the pinion housing:
- Torque sensor
- Angle sensor
These two sensors are made with technology without contacts in order to avoid having elements subject to wear. The feedback of the torque sensor serves the EPS module to manage the servo assistance while driving the vehicle.
The angle sensor has the purpose of generating a signal to the 0 degree position of the steering for each revolution.
The angle sensor is used by the EPS module for the calibration of the servo assist system and the plausibility of steering position and to be able to generate the steering angular value
In calculating the plausibility of the steering position (and thus of the front wheels), there are many other values used including vehicle speed and the speed of the individual wheels.
The EPS module controls and regulates the EPS system.
The power supply for the EPS module is supplied by the battery via the circuit protected by an 80 amp maxi fuse in the remote jump positive post at pin 1 of connector C1 of the EPS module. Pin 2 of connector C1 of the EPS module is grounded.
The ignition-operated supply (INT) comes from a circuit protected by a 7.5 amp fuse in the BCM, at pin 6 of connector C2 of the EPS module.
The Body Control Module (BCM) receives direct battery power via a circuit protected by a 70 amp maxi fuse in the Battery Distribution Unit (BDU).
The BCM receives an ignition-operated power supply (INT) at pin 12 of connector C7 by the signal coming from the Radio Frequency Hub (RFH) module. Pins 1 and 11 of connector C6 of the BCM provide the BCM with a reference ground.
The EPS module is connected through the Controller Area Network (CAN) pins 7 and 8 of connector C2, to the other nodes, in particular the BCM, Antilock Brake System (ABS) module and Instrument Panel Cluster (IPC) to which it sends the signals for the "Electric Power Steering Failure" warning light.