Hitachi Astemo Ltd.

Hitachi Astemo Ueda Co., Ltd.

Ntn Corporation

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Hiromasa Satoh

Yusuke Koga

Toshihiro Obika

Yui Masuda

Tatsuya Yamasaki

Hiromitsu Toyota

Haruo Kotera

Yasushi Aoki

Yasuhiro Yamamoto

Hiromu Narukawa

Sandip Purane

Masato Uno

Kazuki Hiroyama

Takashi Ono

The present invention discloses an electric parking brake control device capable of accurately determining operation of an electric actuator. The electric parking brake control device is capable of performing an application process for controlling the electric actuator to move in the direction in which a friction member is pressed against a rotation body that rotates integrally with a wheel and a release process for controlling the electric actuator to move in the direction in which the friction member is moved away from the rotation body. Even upon receiving (time t) a new operation request for operating the electric actuator during a period (time tto t) from the start of the application process or the release process to the completion of the process, the electric parking brake control device does not change the operation of the electric actuator on the basis of the operation request.

Electric parking brake control device

A vehicle brake system () includes a first control device () and a second control device () that respectively include a master controller (), a first sub-controller (), and a second sub-controller () that are connected to one another. Each of the master controller (), the first sub-controller (), and the second sub-controller () includes a braking force calculation unit that calculates braking force of electric brakes (to), and a determination unit that compares braking force calculation results of the controllers to determine whether itself is normal. The determination unit includes an output block section that blocks, when the determination unit determines that any one of the controllers is not normal, an output of the controller that is determined to be not normal.

Vehicle brake system

A highly reliable vehicle brake system that includes an electric brake and achieves redundancy at low cost is provided. A vehicle brake system () is provided to a wheel (Wa) of a vehicle (VB), and includes an electric brake () provided with a motor (), a driver () that drives the motor (), and a first control device () provided with a master controller () and a first sub-controller () connected to each other. The electric brake () is controllable by both the master controller () and the first sub-controller ().

Provided is a vehicle brake system equipped with an electric brake and which has high reliability and enables redundancy at low cost. This vehicle brake systemis equipped with a mutually connected master controllerand first and second sub-controllers, and an output cut-off control unit. Each of the controllers includes: a braking force calculation section for calculating the braking force of the electric brake; a self-determination section for determining whether or not the controller itself is normal; and an other-determination section for comparing the braking force calculation results of the controllers to determine whether the other two are normal. Upon determining that the master controller is not normal, the output cut-off control unit cuts off the output of the master controller, the determination being made on the basis of the self-determination result made by the master controller, the self-determination result and determination result regarding the master controller made by the first sub-controller, and the self-determination result and determination result regarding the master controller made by the second sub-controller.

A highly reliable vehicle brake system including an electric brake is provided. A vehicle brake system () includes electric brakes (to) provided with motors (to), drivers (to) that drive the motors (to), and a control device that controls the drivers (to). The electric brake () includes two motors (and), and the control device includes separate drivers (and) respectively corresponding to the two motors (and). The control device includes a first master controller () and a first sub-controller (). The first master controller () controls the driver () corresponding to the motor (), and the first sub-controller () controls the driver () corresponding to the motor

Growing community of inventors

Nagano, Japan

Hiromasa Satoh