Electric booster and control method therefor

An electric booster comprising:

• a motor piston configured to rectilinearly move along a first axis in response to an operation of a motor;
• an operating rod configured to rectilinearly move in a second axis in response to a driver's force applied to a brake pedal, the second axis being parallel to the first axis;
• a reaction disc configured to move when pressed by at least one of the motor piston and the operating rod;
• a master cylinder configured to generate a hydraulic pressure when the reaction disc moves;
• a pedal sensor configured to detect a stroke of the brake pedal;
• and
• a control unit configured to control the motor,
• wherein the control unit is configured to:
• receive the stroke of the brake pedal detected by the pedal sensor;
• calculate, based on the stroke of the brake pedal, a required hydraulic braking force and a required stepping force;
• and
• determine a required displacement of the motor piston for generating, using a contact area between the operating rod and the reaction disc, the required hydraulic braking force and the required stepping force, and
• wherein the control unit is further configured to:
• calculates a required braking force based on the stroke of the brake pedal;
• calculates a required regenerative braking force based on the required braking force;
• and
• calculates a required hydraulic braking force based on a difference between the required braking force and the required regenerative braking force.