Functional Description - Central Vision Park Assist Module (CVPAM)

The CVPAM signals from the Electronic power Steering (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 CVPAM manages the steering wheel angle by interfacing with the EPS module control of the Torque Overlay Interface (TOI). When the CVPAM sends a request for TOI, the steering control and the strategies to perform a parking maneuver are activated. During maneuvering, the CVPAM 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 CVPAM sends a torque overlay request to the EPS module. Once the CVPAM 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 CVPAM the steering wheel angle will increase or decrease as a result of torque applied by the EPS.

The CVPAM receives a gated BCM request since with the intent of monitoring the switch status and appropriately switching the PPPA system ON/OFF. The CVPAM 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 CVPAM will request the IPC to display the appropriate message to the customer.

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

Central Vision Processing Module (CVPM) AND THE INTERACTION WITH THE PARK ASSIST SYSTEM AND SIDE DISTANCE WARNING 

The CVPM displays the park assist and Side Distance Warning (SDW) on the surround view top display. The CVPM receives inputs from the CVPAM with the active state of the park assist detections. If there is an object detected within the respective radar range or area; the CVPAM will alert the BCM by sending the appropriate message. The BCM gates the message and sends the message to the CVPM. The CVPM receives this message and then outputs the appropriate arc display request to the DSM.

For further information on surround view system operation. Refer to SURROUND VIEW CAMERA SYSTEM, DESCRIPTION AND OPERATION .