Patent ID: 9010107
Filing Date: 2015-04-21
Classification: B60T

Abstract:
1. An electric booster comprising: an input member adapted to be moved forward or backward in response to an operation of a brake pedal; an assist member disposed so as to be movable relative to the input member; a master cylinder adapted to generate a brake hydraulic pressure according to a forward or backward movement of the assist member; an electric actuator adapted to provide a thrust force to the assist member; a controller adapted to control an operation of the actuator; and a biasing unit adapted to bias the input member and the assist member so that a relative position therebetween is moved toward a predetermined neutral position, wherein the controller can perform automatic brake control of driving the electric actuator regardless of whether there is the operation of the brake pedal, wherein, during the automatic brake control, the controller compares the relative position between the assist member and the input member with a determination threshold value, and determines that the brake pedal is operated in a case where the relative position is smaller than the determination threshold value and the input member is moved by a predetermined amount or more, and wherein the determination threshold value varies depending on the brake hydraulic pressure generated in the master cylinder.