Yazaki Corporation

Kiyoshi Hosokawa

Nobuhiro Imaizumi

Yoshinori Ikuta

Tatsuaki Oniishi

In a multiplex communication system for a bus vehicle, including: a plurality of loads disposed in the bus vehicle and connected to a wire harness; a switch unit for inputting signals to operate the loads and generating multiplex data; a first load drive unit for controlling the loads placed mainly on a floor of the bus vehicle; and a second load drive unit for controlling the loads placed mainly on a ceiling of the bus vehicle, the multiplex communication system further includes a multiplex line interconnecting the switch unit, the first load drive unit and the second load drive unit, and transmitting the multiplex data to the first and second load drive units to execute a multiplex communication, each the first and second load drive units controlling the loads in accordance with the multiplex data received through the multiplex line from the switch unit. The wire harness can be formed with high assembling performance or productivity in the bus vehicle.

Multiplex communication system for vehicle

An overcurrent breaking circuit includes a semiconductor switch inserted in a main current path; a current detector circuit for detecting a current passing through the main current path; a logic circuit for switching off the semiconductor switch when the current detector circuit detects a current exceeding a set value for an overcurrent level; a first unit for prohibiting the logic circuit from performing an operation for switching off the semiconductor switch even if the current detector circuit detects a current exceeding the set value for a first short time period immediately after the semiconductor switch is switched from a breaking state to a conductive state; and a second unit for prohibiting the logic circuit from performing an operation for switching off the semiconductor switch for a second short time period even if the current detector circuit detects a current exceeding the set value when the semiconductor switch remains in a conductive state.

Overcurrent breaking circuit

A switch operating unit 10 has operating switches for operating loads. A load control unit controls the corresponding loads in accordance with the operation of the operating switches according to information, which is stored in first storage device, as to the correlation between the operating switches and the loads. A total rated capacity computation device computes the total rated capacity of the loads to be driven under the control of the load control unit according to information, which is stored in second storage device, as to the rated capacity of each load. When the total rated capacity exceeds a predetermined allowable capacity, the load control unit operates to restrict the driving of the low-priority loads in the order of analog-controlled loads and on-off controlled loads according to the information stored in the second storage device.

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Tokyo, Japan

Kiyoshi Hosokawa