ELECTRIC PARKING BRAKE DEVICE

WIPO Patent Application WO/2020/090376

A1

The purpose of the present invention is to provide an electric parking brake device capable of operating with appropriate tightening force. Therefore, the present invention is provided with: a piston 13 that is moved by an electric motor 24 and presses a brake pad 15 against a disk rotor 16; and an electronic control means 25 for controlling rotation of the electric motor 24. The electronic control means 25 produces a state in which energization of the electric motor 24 is stopped, within a period during which the electric parking brake device is being applied and the load on the electric motor 24 increases and the current increases after start of driving the electric motor 24, detects a voltage and a current during the energization of the electric motor 24, a voltage when the energization of the electric motor 24 is being stopped, and a voltage after an elapse of a predetermined time during which the number of rotations of the electric motor 24 decreases, from stopping the energization of the electric motor, calculates the torque constant of the electric motor 24 using the detected voltages and current, and sets a cutoff current threshold for the electric motor 24 using the calculated torque constant.

AJIMA TOSHIYUKI (JP)
KAI RYU (JP)
SETO SHINJI (JP)
TAKEDA HIROKI (JP)
KOBUNE TATSURO (JP)
SUZUKI SOTA (JP)
NISHINO KIMIO (JP)

PCT/JP2019/039613

May 07, 2020

October 08, 2019

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HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

F16D65/18; B60T13/74; F16D66/00; F16D121/24

WO2016104683A1

2016-06-30

JP2015512824A	2015-04-30
JP2018118524A	2018-08-02

POLAIRE I.P.C. (JP)

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