Honda Motor Co., Ltd.

Denso Corporation

Hitachi Automotive Systems, Ltd.

Toyo Denso Co., Ltd.

Makoto Kurahashi

Gakuji Moriya

Kazuhide Kawai

Katsunori Akimoto

Yoichi Anzo

Shoji Kishi

Noritaka Kimura

Makio Takahashi

Takanobu Kobayashi

Takahiro Kajihara

An ignition apparatus for an internal combustion engine, comprising at least one ignition plug, an actuating circuit provided with first and second coil pairs corresponding to one ignition plug for generating spark discharge in the at least one ignition plug. First and second ignition signals respectively supplied to the first and second coil pair are generated so that a first discharge period and a second discharge period partially overlap with each other during an overlap discharge period, the overlap discharge period is made equal to a set overlap period, and a start timing of the first discharge period is prior to a start timing of the second discharge period. The first and second discharge periods are time periods of electric discharges generated by the first and second coil pairs. The set overlap period is set according to the first discharge period, a temporary cut threshold value, and a discharge start current value at the start timing of the first discharge period. The temporary cut threshold value is a minimum value of the discharge current value at which no temporary cut of the discharge current in the ignition plug occurs.

Ignition apparatus for internal combustion engine

An object of the present invention is to provide an ignition coil for use in an internal combustion engine, offering improved water drainage performance, while achieving high waterproof performance with controlled entry of water in a plug hole. A high-voltage generating sectionthat generates a high voltage is housed inside a coil case. A plug hole sealcloses an opening in a plug holein which an ignition plugis mounted. The ignition coil further includes a space portionplaced on an outer side portion of the high-voltage generating sectionand an air pathfor venting air between the space portionand the plug hole. The space portionhas an open lower surface (an entirely open surface facilitates demolding).

Ignition coil for internal combustion engine

In an ignition coil for an internal combustion engine, a column section and a notched section are provided in a side wall section of a case section of the ignition coil. A ventilation opening is formed in an up/down direction in the column section. The ventilation opening communicates with a ventilation passage formed between a sealing rubber and the case section and is open in an upper end section. A cover surrounding the column section and covering the upper end section is provided in the side wall section. A sealing section sealing the notched section is provided in the cover. The ignition coil has a filler resin that fills a space within the case section being in continuous contact with the sealing section and the side wall section and fixing the cover to the side wall section.

Ignition coil for internal combustion engines

In a plughole waterproofing device for an engine, a coil case is fitted onto the ignition coil that is accommodated in a plughole of an engine, and an upper portion of the case protruding above the engine is provided with a longitudinal air path extending upward from a lower end thereof communicating with the plughole and a vent hole communicating with an upper end portion of the air path and opened to ambient air. A cover wall hanging while surrounding the vent hole is continuously provided on the case upper portion, and an air chamber is formed inside the cover wall, the vent hole being opened in an upper portion of the air chamber, and an opening face being formed at an entire bottom of the air chamber opening toward the engine.

Plughole waterproofing device for engine

Growing community of inventors

Wako, Japan

Makoto Kurahashi