Nippondenso Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Toyota Jidosha Kogyo Kabushiki Kaisha

Tetsuo Tanigawa

Susumu Akiyama

Yoshihisa Sato

Takao Saito

Katsunori Ito

Yuji Hirabayashi

Katsuhiro Ina

Yoshimi Miyamoto

Yugi Hirabayashi

Katsonori Ito

A communication system includes a plurality of separate transmission units. A common signal line connects the units. A token is transferred from a first of the units to a second of the units during one sequence. The token is a right to output data to the common signal line. When the token is rejected by the second unit, the token is retransferred from the first unit at maximum a predetermined number of times during that sequence to the second unit. When the retransferred token is rejected by the second unit, the token may be transferred from the first unit to a third of the units during that sequence. In a next sequence, said predetermined maximum number of times said token is retransmitted to said second unit is then reduced.

Communication system

A plurality of control units are connected via a common signal line through which they communicate. Each control unit is operative to control an apparatus according to certain information the control unit normally receives directly through an exclusive signal line by operation of a directly-inputting device. A check is made to determine whether the directly-inputting device is operating normally. If not, then the required information is inputted from its source indirectly through another control unit by way of the common signal line.

Communication control system

A communication control unit for controlling communication between an electronic control unit and other equipment or other electronic control units, the communication control unit functioning to judge whether or not the operation of the electronic control unit is normal and, if it is judged that the electronic control unit is operating abnormally, the communication control unit acts to reset the electronic control unit to an initial operating status in order to attempt recovery from the abnormal condition, while halting transmission by the electronic control unit until it is judged that the electronic control unit has commenced to operate normally.

Communication control unit providing isolation of failure condition of

An improved ignition coil cover is generally shaped like a cup and divided into two parts or first and second cover segments. The segments are assembled and fitted on an ignition coil so that salt water, water or the like is prevented from entering the cover.

Ignition coil cover

Growing community of inventors

Toyota, Japan

Tetsuo Tanigawa