Method of controlling electric booster for improving heterogeneous braking properties

A method of controlling an electric booster for improving heterogeneous braking properties, the electric booster including a reaction disk, a boosting body configured to perform a translational motion by receiving driving power of a booster motor and generate a clamping force to the reaction disk, and a pedal push rod connected to a pedal and configured to come into contact with the reaction disk, the electric booster being subjected to braking control according to a braking map, the method comprising:

• a first braking control step of controlling, by a controller, and generating a reaction force at normal times in accordance with a pedal effort by compressing and expanding a fluid while moving the pedal push rod;
• and
• a second braking control step of controlling, by the controller, and generating the reaction force in accordance with the pedal effort in a condition in which the reaction disk and the pedal push rod are in contact with each other by detecting a size of an air gap between the reaction disk and the pedal push rod,
• wherein a normal-time reaction force structure used in the first braking control step includes a pedal return rod connected to one side of the pedal push rod and a housing into which the pedal return rod is inserted, the housing being configured to guide a movement of the pedal return rod, and
• wherein a closed space for the fluid is formed between the pedal return rod and the housing.