Patent ID: 11926297
Assignee: HYUNDAI MOTOR COMPANY
Field: Transport (Mechanical engineering)
Classification: CPC B  F  G | IPC B  F  G

Claim 12:
13. A method for predicting a negative pressure of a brake booster of a vehicle, comprising:
a) collecting, by a controller, driving information according to driving of the vehicle to calculate a negative pressure of an intake manifold based on a pressure of the intake manifold and an atmospheric pressure;
b) calculating, by the controller, a first differential pressure over time using a previous negative pressure of the brake booster calculated in a previous cycle and the negative pressure of the intake manifold of a current cycle;
c) taking, by the controller, a difference between the previous negative pressure of the brake booster calculated in the previous cycle and the negative pressure of the intake manifold of the current cycle as a basic factor to calculate a second differential pressure over time and compensating for the basic factor using the brake pedal force; and
d) calculating, by the controller, a change rate by adding a discharging rate of the negative pressure of the brake booster corresponding to the second differential pressure to a charging rate of the negative pressure of the brake booster corresponding to the first differential pressure to predict the negative pressure of the brake booster by integrating the change rate over time,
wherein the controller is further configured to control the vehicle according to a result of predict the negative pressure of the brake booster.