Patent ID: 8833526
Filing Date: 2014-09-16
Classification: B60T,F16D

Abstract:
1. An electric brake apparatus comprising: a caliper configured to move a pressing member by an electric motor via a transmission mechanism, to cause the pressing member to press a brake pad against a disk rotor; a control unit configured to control the electric motor based on a thrust force instruction value of the pressing member which is calculated in response to a control instruction signal; a rotational position detection unit configured to detect a rotational position of the electric motor; and an electric current detection unit configured to detect an electric current flowing through the electric motor, the control unit comprising, a thrust force estimation unit configured to estimate a thrust force of the pressing member from the electric current flowing through the electric motor based on an electric current/thrust force conversion function, which defines a relationship between the electric current flowing through the electric motor and the thrust force of the pressing member, and an electric current/thrust force conversion function update unit configured to correct and update the electric current/thrust force conversion function by comparing an estimated thrust force corresponding to a predetermined rotational position of the electric motor, which is estimated by the thrust force estimation unit, and a reference thrust force corresponding to the predetermined rotational position of the electric motor based on a relationship between the rotational position of the electric motor and the thrust force of the pressing member.