ELECTRIC LINEAR MOTION ACTUATOR AND ELECTRIC BRAKE SYSTEM

摘要

An electric linear motion actuator is provided which can set the clearance during normal braking operation of an electric brake system. The linear motion actuator includes a load sensor for detecting the magnitude of the load with which a friction pad is pressed against the brake disk, a temperature sensor for compensating for the influence of temperature on the load sensor, and an electronic control unit. The electronic control unit is adapted to calculate a target rotational angle from the position of the electric motor corresponding to the magnitude of the load detected by the load sensor to the position of the electric motor where the clearance is at a predetermined value, and control the electric motor to rotate the electric motor by the target rotational angle.

主权项

1. An electric linear motion actuator comprising:
a rotary shaft configured to be driven by an electric motor; a linear motion device which converts a rotation of the rotary shaft to a linear motion of a linear motion member such that the linear motion member is pressed against an object;
a load sensor for detecting a magnitude of a load with which the linear motion member is pressed against the object; a temperature compensator for compensating for an influence of temperature on the load sensor; and a clearance controller for adjusting a clearance between the linear motion member and the object to a predetermined value by controlling the electric motor when pressure on the object from the linear motion member is released, wherein the clearance controller is configured to calculate a target rotational angle from a position of the electric motor corresponding to the magnitude of the load detected by the load sensor to a position of the electric motor where the clearance is at the predetermined value, and control the electric motor to rotate the electric motor by the target rotational angle.