Park Assist Module (PAM)

The PAM signals from the EPS system to determine if the vehicle is travelling in a straight or a curved path and signals from the BSCM to determine the radius of the trajectory travelled by the vehicle.

The PAM manages the steering wheel angle by interfacing with the EPS module control of the Torque Overlay Interface (TOI). When the PAM sends a request for TOI, the steering control and the strategies to perform a parking maneuver are activated. During maneuvering, the PAM continues to check that all conditions are satisfied for PPPA operation and monitors the vehicles lateral displacement. This check is a correlation between X-and-Y coordinates of the planned vehicle position on trajectory and the calculated position of the vehicle based on wheel signal pulses and vehicle angle.

When the reverse gear is engaged the PAM sends a torque overlay request to the EPS module. Once the PAM receives a confirmation response from the EPS module, the EPS module will enable a switching process that allows the steering column torque to be applied. When an increase or decrease in steering wheel angle is being requested by the PAM the steering wheel angle will increase or decrease as a result of torque applied by the EPS.

The PAM receives a gated BCM request since with the intent of monitoring the switch status and appropriately switching the PPPA system ON/OFF. The PAM acknowledges a valid switch input at any vehicle speed. If the BCM recognizes a switch ON/OFF request equal to or greater than 60 seconds, a DTC is set for switch stuck on and the PAM will request the IPC to display the appropriate message to the customer.

Upon TOI activation, the PAM sets a maneuver signal to forward or backward according to the vehicle movement. During maneuvering the maximum torque value allowed is between -5 N.m and +5 N.m. If any abort conditions are detected or the customer cancels operation by using the switch, the PAM immediately disabled the EPS module TOI.