Hitachi Automotive Systems, Ltd.

Yoshiyasu Negishi

Takayuki Fukuzawa

Yoshio Kawai

Hitoshi Furudate

Kiyotaka Kanno

Kentaro Yamanaka

Kawai Yoshio

Depending on the orientation by which a breathing filter is mounted in a vehicle, water can accumulate in the breathing filter, and prevent the pressure difference between the space inside a case and the outside air from being adjusted; therefore, the vehicular layout is limited. Also, because the filter is formed in the center of the case, electronic parts cannot be installed on substrates on the upper and lower surfaces of the filter, meaning that the substrate size and the case size will increase. In addition, the costs will increase. The structure of the present invention is characterized in that breathing paths are provided on the surfaces sandwiching a portion where a filter film is welded in the corner of a resin-side case of a vehicle-mounted electronic control device such as an engine control unit or an automatic transmission control unit, and in that the breathing paths are connected inside.

Case structure for electronic control device

In a configuration that a thermal grease is applied between a circuit board having an electronic component mounted thereon and a case body containing the board to thermally connect both by the thermal grease, the application has not been easy since the thermal grease is high in initial viscosity. A thermal grease is made of a material that has a viscosity not impeding applicability at the initial stage (before application), for example, a viscosity of about 50-400 (Pa&#xb7;s), and that increases to about 600-3,000 (Pa&#xb7;s) in viscosity after application.

Electronic control apparatus and method for connecting substrate of electronic control apparatus

An electronic control device () includes a housing having a plurality of housing members () joined together, a housing vent hole () formed through the housing member () so as to extend in a thickness direction of the housing member, a protection wall () covering an outer opening () of the housing vent hole (), with a gap () left between the protection wall () and the outer opening (), a protection-wall vent hole () formed in the protection wall () at a position apart from the housing vent hole () so as to extend from the gap () in a radial direction of the housing vent hole (), and an air-permeable waterproof membrane () fixed to an inner opening () of the housing vent hole (). A vent passage () with a bent part () is formed between the air-permeable waterproof membrane () and the protection-wall vent hole ().

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Ibaraki, Japan

Yoshiyasu Negishi