Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Nippondenso Co., Ltd.

Shigeru Uehara

Akihiro Sasaki

Tomohisa Kishigami

Akihiro Tanaka

Yasushi Shinojima

Nobutomo Takagi

Toshiaki Isobe

Yasushi Kanda

Kenji Kobayashi

Yuuzi Hirabayashi

Shinji Shimoke

In a data communication system in which many nodes are connected to a common data bus so that each node can communicate with other nodes, a data frame to be transmitted from a node to other nodes includes a message having a variable length interposed between a signal indicating the length of the message and a signal indicating the end of the message in the frame. The message and the signals are coded according to a coding rule such as NRZ, and a bit stuffing rule is applied to the signal indicating the length of the message and the message while another rule violating the bit stuffing rule is applied to the signal indicating the end of the message. When the message length is changed due to noise or other causes in the course of data transmission, the signal indicating the end of the message is clearly detected at a receiving end because it is coded according to a rule different from the rule applied to the message and other signals. Further, since the length of the message actually received at the receiving end can be compared with the signal indicating the length of the message, transmission error can be detected without fail.

Data communication system and electronic control unit used therein

A circuit arrangement disposed in a node within a local area network is connected to a communication bus within the local area network. The circuit arrangement includes an input circuit for introducing data from the communication bus into the node. A node state detecting device is operative for detecting whether or not the node is in a stand-by state. A power feed suspending device is operative for suspending power feed to at least part of the input circuit when the node state detecting device detects that the node is in the stand-by state. A power feed restarting device is operative for monitoring a voltage at the communication bus, and restarting the power feed to at least part of the input circuit when the voltage at the communication bus becomes equal to a level indicating reception of data. A protective circuit is operative for protecting the input circuit from an abnormal current which flows from the communication bus.

Communication circuit for local area network

A multiplex transmission system for a vehicle is constructed such that signals are given and received via a communication line between a plurality of peripheral stations and a central station. The plurality of peripheral stations are arranged at various places such as a door system, an engine system and the like. Each of the peripheral stations is constructed such that an input signal from the plurality of working members (a door lock, a power window and the like) is sent to the central station via the communication line. A control signal from the central station is input via the communication line 5 by the peripheral stations to output to the plurality of working members. Depending on the bit unit form of the control signal working members are actuated. The central station processes data sent by the peripheral stations to generate the control signal.

Multiplex transmission system for vehicle

Growing community of inventors

Toyota, Japan

Shigeru Uehara