公开(公告)号：US20220382235A1

公开(公告)日：2022-12-01

申请号：US17770416

申请日：2020-08-19

Applicant: Hitachi, Ltd.

Inventor： Tatsuya MARUYAMA ,  Yusaku OTSUKA ,  Hidenori OMIYA ,  Toshiki SHIMIZU ,  Iori KOBAYASHI ,  Kazutaka ONISHI ,  Noritaka MATSUMOTO

IPC: G05B19/042

Abstract: In the conventional distributed control system, since each control device updates the data area at a timing when a control packet is received, in a case where there is a difference in communication delay between the control devices or in a case where the communication delay includes jitter, it is difficult to match the contents of data in all the control devices in a case of focusing on a certain moment during system operation. Therefore, depending on the start timing of a control application, the control application operates on the basis of different data between the control devices, thus limiting control performance improvement. Accordingly, time slots on the network are allocated according to the result of a calculation unit, and a cyclic memory synchronization update unit synchronizes the timing of reflecting data in the input/output and the cyclic memory and the timing of using data of a cyclic memory.

公开(公告)号：US20220271854A1

公开(公告)日：2022-08-25

申请号：US17182064

申请日：2021-02-22

Applicant: Hitachi, Ltd.

Inventor： Tatsuya MARUYAMA ,  Shoji YUNOKI ,  Hidenori OMIYA ,  Yusaku OTSUKA ,  Iori KOBAYASHI ,  Toshiki SHIMIZU

IPC: H04J3/06 ,  H04L29/08

Abstract: Example implementations described herein are directed to a plurality of control functions connected via a communication network and synchronized, where the control functions communicate packets including control data, the function identifier for the function associated with the control data, and time identifier such as a time identifier representing the synchronized time associated with the control data. Example implementations determine control data associated with the function identifier and the time identifier from one or more packets that has the same function identifier and time identifier, received in the certain time period based on the time specified by the time identifier.

公开(公告)号：US20220131681A1

公开(公告)日：2022-04-28

申请号：US17600154

申请日：2020-02-13

Applicant: Hitachi, Ltd.

Inventor： Tatsuya MARUYAMA ,  Mitsuyasu KIDO ,  Shoji YOSHIDA ,  Kazuhisa TAKAMI ,  Takamichi ENDO

IPC: H04L7/00 ,  H04L7/04

Abstract: In the related art, since there is a difference in communication delay time in a round-trip communication path due to packet clogging in a network configuration using a network relay device, there is a problem that time cannot be synchronized. In order to solve the above problem, in the present invention, a time synchronization unit 131 is controlled by the time synchronization control unit 130 to perform time synchronization once, delays of an egress path and an ingress path of the time packet on the basis of the synchronization time are calculated, and time synchronization processing is executed using a time of the time packet in a case where the calculated values are equal to each other.

公开(公告)号：US20160360497A1

公开(公告)日：2016-12-08

申请号：US15172315

申请日：2016-06-03

Applicant: Hitachi, Ltd.

Inventor： Tatsuya MARUYAMA ,  Tsutomu YAMADA ,  Mitsuyasu KIDO ,  Shouji YOSHIDA ,  Kazuhisa TAKAMI

IPC: H04W56/00 ,  H04W72/12

CPC classification number: H04W56/001 ,  H04L47/36 ,  H04L47/628 ,  H04L49/3072 ,  H04L51/04 ,  H04L65/608 ,  H04N21/45457 ,  H04N21/6437

Abstract: There is provided a communication control device including: a real-time communication status extraction unit that acquires a communication timing of real-time data; a dynamic fragment size determination unit that acquires a fragment size of sending data which can be sent until the communication timing acquired by the real-time communication status extraction unit; a fragment processing unit that fragments non-real-time data to have at least a fragment size which is equal to or less than the fragment size acquired by the dynamic fragment size determination unit; and a communication unit that sends the non-real-time data, which is fragmented by the fragment processing unit, before the communication timing of the real-time data.

Abstract translation: 提供了一种通信控制装置，包括：实时通信状态提取单元，其获取实时数据的通信定时; 动态片段大小确定单元，其获取可以发送的发送数据的片段大小，直到由所述实时通信状态提取单元获取的通信定时; 片段处理单元，其将非实时数据分段成至少具有等于或小于由所述动态片段大小确定单元获取的片段大小的片段大小; 以及通信单元，其在实时数据的通信定时之前发送由片段处理单元分段的非实时数据。