Denso Corporation

Yuuto Tamei

Shunichi Takeda

Takashi Oono

Akimitsu Sugiura

Makoto Toriyama

Satoru Nakayama

Naoto Hayashi

Masahiro Ishitani

Yuuki Kondou

Hisaharu Morita

Masamichi Shibata

Kanechiyo Terada

Kaori Doi

A maximum value of a discharge current from a capacitor, detected by a primary-side current detection meansdisposed at a grounded end of the capacitor, is controlled such as not to exceed a predetermined first control value Y. The first control value Yis derived based on magnetic saturation of a primary winding, with the control being performed by controlling the on-off state of an energy injection switching means. As a result, magnetic saturation of the primary windingcan be prevented, and the reliability of an ignition apparatus which incorporates an energy injection circuitcan be increased.

Ignition apparatus for internal combustion engine

An ignition control apparatus of the present embodiment controls operation of an ignition plug provided so as to ignite an air-fuel mixed gas. The ignition control apparatus is characterized in that the ignition control apparatus includes: an ignition coil provided with a primary winding which allows a current to pass as a primary current therethrough and a second winding connected to the ignition coil, an increase and a decrease in the primary current generating a secondary current passing through the secondary winding; a DC power supply provided with a non-ground side output terminal, the non-ground side output terminal being connected to one end of the primary winding so that the primary current is made to pass through the primary winding; a first switching element configured of a semiconductor switching element provided with a first control terminal, a first power side terminal, and a first ground side terminal, the semiconductor switching element controlling on and off states of current supply between the first power side terminal and the first ground side terminal based on a first control signal inputted to the first control terminal, the first power side terminal being connected to the other end side of the primary winding, the first ground side terminal being connected to a ground side; a second switching element configured of a semiconductor switching element provided with a second control terminal, a second power side terminal, and a second ground side terminal, the semiconductor switching element controlling on and off states of current supply between the second power side terminal and the second ground side terminal based on a second control signal inputted to the second control terminal, the second ground side terminal being connected to the other end side of the primary winding; a third switching element configured of a semiconductor switching element provided with a third control terminal, a third power side terminal, and a third ground side terminal, the semiconductor switching element controlling on and off states of current supply between the third power side terminal and the third ground side terminal based on a third control signal inputted to the third control terminal, the third power side terminal being connected to the second power side terminal of the second switching element, the third ground side terminal being connected to the ground side; and an energy accumulation coil configured of an inductor, the inductor being interposed in a power line connecting the non-ground side output terminal of the DC power supply and the third power side terminal of the third switching element, the energy accumulation coil accumulating energy therein in response to turning on of the third switching element.

Ignition control apparatus

An ignition control device comprises: a first switching element having a power source side terminal connected to an other end side of a primary coil and a first ground side terminal connected to a ground side; a second switching element having a second ground side terminal connected to the other end side of the primary coil; a third switching element having a third power source side terminal connected to the second power source side terminal in the second switching element, and a third ground side terminal connected to the ground side; and an energy storage coil. The energy storage coil is an inductor interposed in an electric power line connecting a non-ground side output terminal in a DC power source and the third power source side terminal in the third switching element, and stores energy from the turning on of the third switching element.

A spark plughas a center electrodeand a ground electrodeopposed to each other and causes a spark discharge to occur through application of a voltage between the center electrodeand the ground electrode. Moreover, the center electrodehas a columnar main chipprovided at a distal end thereof by welding via a fusion portionand an annular auxiliary chipsurrounding the fusion portion. Consequently, when a spark discharge occurring from the center electrodeis blown to the downstream side by the influence of a gas flow in a cylinder of an internal combustion engine, it is possible to suppress a cathode point from being formed in the fusion portionsince the fusion portionis surrounded and thus protected by the auxiliary chip. As a result, it is possible to suppress wear of the center electrode, thereby extending the service life of the spark plug

Spark plug

Growing community of inventors

Kariya, Japan

Yuuto Tamei