Brake system with shift out of park support

A vehicle control system comprising:

• a gear selector operably coupled to a transmission of the vehicle to shift the vehicle between various states including at least drive, reverse and park;
• a braking torque module operably coupled to brake hardware of the vehicle to provide braking force or braking torque to the brake hardware based on a brake pedal position;
• an electric park brake;
• and
• a hold controller operably coupled to a sensor network of the vehicle to receive vehicle status information to:
• determine that the vehicle is in park on a slope with the electric parking brake applied;
• determine that the vehicle is not moving;
• responsive to detecting a shift of the vehicle out of park, direct a build-up of brake pressure until a brake pressure target is reached, the brake pressure target being selected at least in part based on an amount of slope of the vehicle and an estimation of vehicle mass;
• and
• holding the brake pressure at the brake pressure target until a release condition is met,
• wherein the brake pressure target is determined based at least in part on a fixed value defined based on vehicle type, as defined by vehicle model or modification.

A vehicle control system comprising:

• a gear selector operably coupled to a transmission of the vehicle to shift the vehicle between various states including at least drive, reverse and park;
• a braking torque module operably coupled to brake hardware of the vehicle to provide braking force or braking torque to the brake hardware based on a brake pedal position;
• an electric park brake;
• and
• a hold controller operably coupled to a sensor network of the vehicle to receive vehicle status information to:
• determine that the vehicle is in park on a slope with the electric parking brake applied;
• determine that the vehicle is not moving;
• responsive to detecting a shift of the vehicle out of park, direct a build-up of brake pressure until a brake pressure target is reached;
• holding the brake pressure at the brake pressure target until a release condition is met;
• and
• releasing the brake pressure at a selected release rate responsive to the release condition being met,
• wherein the brake pressure target is a larger of a brake pressure requested by a driver of the vehicle based on a brake pedal input and a hold pressure required to hold the vehicle based on a current vehicle state.