Hitachi Astemo Ltd.

Shin-etsu Chemical Co., Ltd.

Yasuhiro Yamamoto

Yoichi Tanifuji

Hiromasa Satoh

Kazuki Hiroyama

Hiromu Narukawa

Sandip Purane

Mari Takahashi

Masato Uno

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

Provided is an electric parking brake device in which a drum brake includes braking gap automatic adjustment means and a parking brake lever, and the operation of an electric actuator that drives the parking brake lever is controlled by a control unit. When an application operation time of the electric actuator () by the time when a parking brake state is obtained has exceeded a predetermined application operation end determination time (T), the control unit (C) determines that the braking gap automatic adjustment means () is abnormal. With this configuration, at the time of obtaining the parking brake state, the presence or absence of abnormality in the braking gap automatic adjustment means can be determined.

Electric parking brake device

A polymerization apparatus equipped with a circuit made up of a polymerization vessel, a heat exchanger placed outside said polymerization vessel, and a circulation pipeline extending from said polymerization vessel and returning to said polymerization vessel through said heat exchanger, a branch pipeline being connected to said circulation pipeline through a ball valve comprising a spherical valve element and a valve body for housing said spherical valve element, wherein the valve body of said ball valve is joined directly to said circulation pipeline, and a method of producing a polymer of a monomer having an ethylenically unsaturated double bond by using said apparatus. Scale and polymers in the form of blocks can be prevented from mixing with the reaction mixture. Therefore, where the obtained polymer is formed into a sheet or the like, the fish eyes can be decreased, and if the polymerization is repeated, clogging of the tubes of the heat exchanger and drop in the flow velocity of the reaction mixture can be prevented.

Vinyl chloride polymerization process using ball valves in recycle line

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Ibaraki, Japan

Yasuhiro Yamamoto