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公开(公告)号：US10666320B2
公开(公告)日：2020-05-26
申请号：US16201216
申请日：2018-11-27
Applicant: DENSO CORPORATION
Inventor： Takuya Honda , Hirofumi Isomura , Tomohisa Kishigami
IPC: H04B3/42 , H04L25/02 , H03K19/0175 , H03K5/1252
Abstract: A ringing suppression circuit is provided at one or more nodes each having a communication circuit executing communication with another node by transmitting a differential signal through a pair of communication lines connected to the nodes. The circuit includes a suppression circuit and an operation mode controller: The suppression circuit is configured to execute a suppression operation for suppressing ringing in the differential signal. The operation mode controller is configured to set an operation mode of the suppression circuit to one of: a normal operation mode, which enables the suppression circuit to execute the suppression operation in response to detecting a change in a level of the differential signal, and a permanent off mode, which disables the suppression circuit to execute the suppression operation on a steady basis.
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公开(公告)号：US10445493B2
公开(公告)日：2019-10-15
申请号：US15459444
申请日：2017-03-15
Applicant: DENSO CORPORATION
Inventor： Hiroki Suzuki , Tomohisa Kishigami
Abstract: An information processing system made up of a plurality of controllers in a vehicle has a tamperproof configuration by including, in a specific controller among the plurality of controllers: a starter putting the specific controller among the plurality of controllers in a executable state which enables the specific controller among the plurality of controllers to execute a preset program; a determiner determining, before the specific controller among the plurality of controllers is put in the executable state, whether software that is memorized in a preset memory area and at least includes the preset program is tampered; and an outputter outputting, to one of processing devices outside the vehicle. In such manner, the tampering of the software is quickly detectable while preventing an increase of communication load of a communication network and/or the information processing system.
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公开(公告)号：US10432188B2
公开(公告)日：2019-10-01
申请号：US16099711
申请日：2017-08-04
Applicant: DENSO CORPORATION , SOKEN, INC.
Inventor： Hiroyuki Mori , Takuya Honda , Tomohisa Kishigami , Hirofumi Isomura
Abstract: A ringing suppression circuit connected to a transmission line to suppress ringing caused by the transmission line transmitting a differential signal using a pair of signal lines, the differential signal varying between a high level and a low level, the pair of signal lines including a high potential signal line and a low potential signal line, the ringing suppression circuit including: an inter-line switching element that is connected between the pair of signal lines; a control portion that performs a ringing suppression operation in response to detecting a level change in the differential signal, wherein the ringing suppression operation turns on the inter-line switching element to decrease an impedance between the pair of signal lines; and a suppression operation prohibiting portion that prohibits the control portion from performing the ringing suppression operation in response to detecting a signal caused by a signal on the transmission line.
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公开(公告)号：US10284388B2
公开(公告)日：2019-05-07
申请号：US15744103
申请日：2016-06-13
Applicant: DENSO CORPORATION
Inventor： Tomohisa Kishigami , Shigeki Ohtsuka , Nobuaki Matsudaira , Hironobu Akita
Abstract: A communication system includes a transmission path and multiple nodes. At least one of the multiple nodes includes a second communication portion and a control portion in addition to a first communication portion. When the control portion performs a high speed communication, the control portion shifts the first communication portion included in each of the remaining multiple nodes to a sleep mode. The second communication portion performs a differential communication at a higher speed than the first communication portion using a differential signal. In the differential signal, a maximum of a potential difference between the pair of communication lines is equal to or less than a recessive threshold value, and a minimum of the potential difference between the pair of communication lines is a negative voltage value that has a polarity opposite to the recessive threshold value of the first communication portion.
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公开(公告)号：US10128825B2
公开(公告)日：2018-11-13
申请号：US15753596
申请日：2016-08-25
Applicant: DENSO CORPORATION , SOKEN, INC.
Inventor： Hiroyuki Mori , Takuya Honda , Tomohisa Kishigami , Hirofumi Isomura
IPC: H03K5/08 , H03K5/1252 , H04B3/42 , H03K17/687
Abstract: A ringing suppression circuit includes: a single line switching element, which is driven by a voltage, that is connected between a pair of signal lines; a controller that detects a change in a level of the differential signal and turns on the single line switching element to lower an impedance between the pair of signal lines; a period detector that detects a length of a suppressing period indicated by a setting signal, which is an input; and a suppressing period storage that stores the length of the suppressing period which is detected by the period detector. In addition, the pair of signal lines includes a high potential signal line and a low potential signal line. Moreover, the controller turns on the single line switching element for only the suppressing period having the length, which is stored in the suppressing period storage.
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Patent Agency Ranking
公开(公告)号：US09203661B2
公开(公告)日：2015-12-01
申请号：US14467203
申请日：2014-08-25
Applicant: DENSO CORPORATION
Inventor： Hideki Kashima , Tomohisa Kishigami
CPC classification number: H04L25/4902 , H04B3/542 , H04B3/548 , H04B14/026
Abstract: A communication system performs communication using a pulse width modulation code as a transmission code. The communication system includes a plurality of nodes that are connected via a transmission line to be capable of communicating with each other. Each of the nodes including a driver circuit. The driver circuit includes a transistor that enables and blocks conduction between the transmission line and a ground line. The plurality of nodes includes a master node and a slave node. The master node is one of the plurality of nodes. The slave node is at least one node other than the master node among the plurality of nodes. The master node includes a limiter that restricts, when the transistor of the driver circuit is turned off, changes in a conductive state of the transistor.
Abstract translation: 通信系统使用脉宽调制码作为发送码进行通信。 通信系统包括通过传输线连接以能够彼此通信的多个节点。 每个节点包括一个驱动电路。 驱动器电路包括一个能够和阻止传输线与接地线之间的导通的晶体管。 多个节点包括主节点和从节点。 主节点是多个节点之一。 从节点是多个节点之中的至少一个节点，而不是主节点。 主节点包括限制器，其限制当驱动器电路的晶体管截止时，晶体管的导通状态发生变化。
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公开(公告)号：US20140056388A1
公开(公告)日：2014-02-27
申请号：US13973203
申请日：2013-08-22
Applicant: Denso Corporation
Inventor： Hiroyuki Mori , Naoki Kamikawa , Masayoshi Satake , Tomohisa Kishigami , Tomoyuki Koike
IPC: H04B1/10
Abstract: In a receiver circuit, a binary signal is generated based on a signal level of a received signal that has been received via a transmission line from a driver of a transmitter circuit. Then, a first stable state and a second stable state are detected based on a reference signal whose signal level changes in accordance with the received signal. In the first stable state, the received signal is stable at a first signal level. In the second stable state, the received signal is stable at a second signal level. When the first stable state is detected and the received signal is changed from the first signal level into the second signal level, the generated binary signal is retained at a signal level corresponding to the second signal level, until the second stable state is detected.
Abstract translation: 在接收机电路中，基于已经经由发射机电路的驱动器的传输线接收的接收信号的信号电平来生成二进制信号。 然后，基于信号电平根据接收信号而改变的参考信号来检测第一稳定状态和第二稳定状态。 在第一稳定状态下，接收信号在第一信号电平下稳定。 在第二稳定状态下，接收信号在第二信号电平下稳定。 当检测到第一稳定状态并且将接收信号从第一信号电平改变为第二信号电平时，所生成的二进制信号保持在与第二信号电平相对应的信号电平，直到检测到第二稳定状态。
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公开(公告)号：US20140047255A1
公开(公告)日：2014-02-13
申请号：US13960034
申请日：2013-08-06
Applicant: DENSO CORPORATION
Inventor： Takahiro Sasaki , Tomohisa Kishigami , Tomoko Kodama
IPC: G06F1/32
CPC classification number: G06F1/3234 , B60R25/24 , H04L12/40 , H04L12/40039 , H04L41/06 , H04L67/02 , H04L2012/40273
Abstract: An on-board network system is presented. The on-board network system sends a sleep-entered message to a communication bus. The sleep-entered message is sent under a condition that a sleep condition is satisfied on a basis that a network management (NM) message is ceased during state transition process in which node's state transfers from a normal state to a power-saving state. A monitoring ECU corresponding to a master performs an abnormality detection process. In the abnormality detection process, the monitoring ECU detects an abnormality state of the state transition process based on whether or not the sleep-entered message is sent from any one of nodes, thereby it is possible to detect the abnormality state not only during each node is a normal state but also during a bus-sleep state.
Abstract translation: 提供了一个车载网络系统。 车载网络系统向通信总线发送睡眠输入消息。 睡眠输入消息是在状态转换过程中基于在节点的状态从正常状态转换到省电状态的状态转移过程中停止网络管理（NM）消息的基础来满足睡眠条件的条件下发送的。 与主机对应的监视ECU执行异常检测处理。 在异常检测处理中，监视ECU基于是否从任一个节点发送了睡眠输入消息来检测状态转换处理的异常状态，从而可以不仅在每个节点期间检测异常状态 是一个正常状态，但也是在一个公共汽车睡眠状态。
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公开(公告)号：US20140036987A1
公开(公告)日：2014-02-06
申请号：US13954069
申请日：2013-07-30
Applicant: DENSO CORPORATION
Inventor： Hideki Kashima , Tomohisa Kishigami , Naoji Kaneko
IPC: H03K7/08
CPC classification number: H03K7/08
Abstract: A decoder for decoding an input signal coded with a pulse width modulation code as a line code to an output signal in a binary code, has a first memory, a first timer, a determination circuit and a first controller. The information on a duty duration of the PWM code, corresponding to at least one kind of the output signals, is stored on the first memory. The first timer has a capacity to measure the duty duration of the input signal. The determination circuit has a capacity to determining which kind of the output signals corresponds to the input signal, on the basis of the information stored on the first memory and the duty duration measured with the first timer. The first controller has a capacity to updating the information stored on the first memory, on the basis of the determination result and the measured duty duration.
Abstract translation: 将以脉冲宽度调制码编码的输入信号解码为二进制码中的输出信号的行码的解码器具有第一存储器，第一定时器，确定电路和第一控制器。 对应于至少一种输出信号的PWM代码的占空比持续时间的信息被存储在第一存储器上。 第一定时器具有测量输入信号占空比的能力。 确定电路具有根据存储在第一存储器上的信息和用第一定时器测量的占空比来确定哪种输出信号对应于输入信号的能力。 第一控制器具有根据确定结果和测量的占空比持续时间来更新存储在第一存储器上的信息的能力。
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公开(公告)号：US11528163B2
公开(公告)日：2022-12-13
申请号：US17172221
申请日：2021-02-10
Applicant: DENSO CORPORATION
Inventor： Tomoya Tokunaga , Tomohisa Kishigami
Abstract: A communication system, in which a plurality of nodes communicate with each other according to a communication protocol, which wakes up some of the plurality of nodes when a communication frame containing specific start information occurs on or is transmitted to the communication bus, includes a master node determines, for each of slave nodes, a start condition, which is a condition for transition of a subject node from a sleep state to a normal state. The master node transmits, to the communication bus, the determined start condition tailored for each of the slave nodes for a reception thereof by each of the slave nodes.
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