Denso Corporation

Kenechiyo Terada

Makoto Toriyama

Kaori Doi

Satoru Nakayama

Naoto Hayashi

Kenta Kyouda

An ignition apparatus inputs energy during a predetermined energy input period after the interruption of a primary electric current by an ignition switch and a discharge of an ignition plug caused by a secondary electric current. Moreover, the ignition apparatus includes a blow-off detection unit that detects, during the energy input period IGW after the start of the discharge by the ignition plug, occurrence of blow-off of the discharge. When the secondary electric current Idrops below a blow-off detection electric current threshold value Ibo at a time instant tbo in a 'second region' where it is impossible to perform a re-discharge after blow-off, the blow-off detection unit determines that blow-off has occurred and the ignition apparatus stops the energy input from an energy input unit to an ignition coil. By preventing unnecessary energy input, it is possible to suppress unnecessary electric power consumption and wear of electrodes of the ignition plug.

Growing community of inventors

Kariya, Japan

Kenechiyo Terada