System and method for predicting negative pressure of brake booster of vehicle

A system for predicting a negative pressure of a brake booster of a vehicle, the system comprising:

• a driving information detector configured to detect driving information related to the vehicle according to driving of the vehicle;
• and
• a controller operatively connected to the driving information detector and configured to determine a negative pressure of an intake manifold according to a pressure of the intake manifold and the driving information including an atmospheric pressure,
• wherein the controller includes a booster negative pressure predictor configured to predict the negative pressure of the brake booster by integrating over time a change rate according to a charging rate and a discharging rate of the negative pressure of the brake booster determined using a negative pressure of the brake booster determined in a previous cycle according to a logic for predicting the negative pressure of the brake booster and the negative pressure of the intake manifold of a current cycle and an imitated brake pedal force signal of the current cycle imitating an acceleration of the vehicle,
• wherein the controller is configured to control an operation of an air conditioner according to the predicted negative pressure of the brake booster, and
• wherein the booster negative pressure predictor includes:
• a charging model module configured to determine a first differential pressure over time using the negative pressure of the brake booster determined in the previous cycle and the negative pressure of the intake manifold of the current cycle;
• a discharging model module configured to take a difference between the negative pressure of the brake booster determined in the previous cycle and the negative pressure of the intake manifold of the current cycle as a basic factor, and to compensate for the basic factor using the imitated brake pedal force signal to determine a second differential pressure over time;
• a summing module configured to determine the change rate by adding a discharging rate of the negative pressure of the brake booster corresponding to the second differential pressure to the charging rate of the negative pressure of the brake booster corresponding to the first differential pressure;
• and
• an integration module configured to integrate the change rate over time and to output the predicted negative pressure of the brake booster.