Mazda Motor Corporation

The Furukawa Electric Co., Ltd.

Yuichi Ito

Osamu Michihira

Yusaku Himono

Yutaka Matsuda

Kiyoshi Inoue

Teruhisa Inoue

Tomoji Izumi

Nagahisa Fujita

Atsuhiko Suzuki

Yukio Nanpo

Kyosuke Hasimoto

Makoto Muto

A multipath transmission system for an automobile according to the present invention comprises a plurality of multiplex transmission units connected in parallel with each other to one common bus. Each transmission unit is assigned to one of groups in which various devices attached to the automobile are classified. The transmission unit includes a sending circuit for transmitting the multiple signals from the devices in the group concerned to the other units through the bus. The system further comprises a power source for always applying electric power to the sending circuit of at least one of the multiplex transmission units. Only that multiplex transmission unit to which the electric power is always applied is provided with a bias circuit which sets the potential of the multiple signals on the bus when the multiple signals are supplied from the sending circuits of any multiplex transmission unit to the bus.

Automotive multipath transmission system with power always supplied to

An integrated circuit disclosed in this application includes a circuit board in which a conductive layer having a desired pattern is formed on a metal substrate through an insulating layer, and a circuit element group mounted on the insulating layer and connected to the predetermined conductive layer. A judgment circuit for discriminating on the basis of a potential of the metal substrate which one of at least two different logic processing modes is set is formed on the insulating layer. The circuit element group includes a circuit element including a logic processing unit having at least two different logic processing contents. The circuit element selectively switches and executes a logic processing operation corresponding to the logic processing mode discriminated by the judgment circuit from the at least two different logic processing contents.

Integrated circuit having metal substrate used to provide electrical

A multiplex transmission system, in which a node as a transmission node transmits data frame by frame to a transmission path, and a plurality of other nodes, as reception nodes, returns a reception acknowledgment signal to the transmission path upon proper reception of the frame of data. Each of the reception nodes which properly received the frame returns the reception acknowledgment signal specific thereto to that division of a reception acknowledgment signal area in the frame which corresponds to this node. Each node discriminates the success/failure of signal transmission, by comparing the information registered beforehand in its reception acknowledgment signal table with the information in the reception acknowledgment signal area. When the information of the reception acknowledgment signal table does not coincide with that of the reception acknowledgment signal area, the transmission node re-transmits the frame and the reception acknowledgment signal tables of all the nodes are updated. The system can not only effect the addition and deletion of multiplex nodes easily without requiring the change of scale of the circuit of the system, but also discriminate trouble for each of the multiplex nodes.

Multiplex transmission system

A multiplex transmission system, in which a plurality of nodes are coupled together through a transmission path, and a node as a transmission node transmits a frame of data including a data area containing transmission data, to other nodes as reception nodes through the transmission path. The frame of data includes a data valid/invalid area having the same bit length as the data area and indicating, bit by bit, the validness/invalidness of the data carried by the corresponding bits in the data area. The system need not be modified depending on the model and grade of vehicles, and can be used widely and applied to various options by the use of a signal allocation system common to different models and grades of vehicles. Those bits in the data area which correspond to the bits in the data valid/invalid area indicative of data invalidness may have values thereof set to a fixed value, so that the reception node judges the transmission node to be defective when a bit of the data valid/invalid area of the received frame and the corresponding bit of the data area of the received frame make a combination of specific values.

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Hiroshima, Japan

Yuichi Ito