公开(公告)号：US20190027902A1

公开(公告)日：2019-01-24

申请号：US16037332

申请日：2018-07-17

Applicant: DENSO CORPORATION

Inventor： Shohei ISHIDA ,  Noriaki NISHIO ,  Shun SUGITA ,  Yuya ABE

IPC: H01T13/32 ,  H01T13/02

CPC classification number: H01T13/32 ,  H01T13/02 ,  H01T13/467

Abstract: A spark plug includes a main ground electrode having a main connecting portion connected to the housing and forming a discharge gap between the main ground electrode and the center electrode, and a sub ground electrode having a sub connecting portion connected to the housing. The direction on which the main connecting portion and a plug center axis are arranged is set to be perpendicular to an air flow direction of an air stream in the combustion chamber. The sub connecting portion is located in a downstream side than the main connecting portion. The tip end position of the sub ground electrode in the plug axial direction is located in farther tip end side than that of the main ground electrode is. The sub ground electrode is configured such that an end point of the discharge spark is movable on the sub ground electrode.

公开(公告)号：US20180266381A1

公开(公告)日：2018-09-20

申请号：US15573914

申请日：2016-05-12

Applicant: DENSO CORPORATION ,  SOKEN, INC.

Inventor： Hideaki KOSUGE ,  Fumiaki AOKI ,  Shohei ISHIDA ,  Shunichi TAKEDA ,  Kazuaki UEDA

IPC: F02P15/10 ,  F02P17/12 ,  F02P3/04

Abstract: An ignition apparatus for internal combustion engines is provided. The ignition apparatus is equipped with an ECU. The ECU monitors a path length of a discharge of a spark for a period of time in which a second circuit delivers or inputs energy in the form of a threshold value determination. When the path length has become too short, the ECU determines that ignition is expected to be delayed and then selects a special mode to control the delay of the ignition. The ECU increase a target value of an energy input amount. This enables the delay of ignition resulting from a short extension of the path length to be minimized. The ignition apparatus equipped with the second circuit to continue the discharge of sparks is, thus, capable of reducing a variation in ignition without the need for uniformly increasing the energy input amount.

公开(公告)号：US20180245562A1

公开(公告)日：2018-08-30

申请号：US15753227

申请日：2016-07-26

Applicant: SOKEN, INC. ,  DENSO CORPORATION

Inventor： Shohei ISHIDA ,  Shunichi TAKEDA

IPC: F02P5/15 ,  F02P9/00

CPC classification number: F02P5/15 ,  F02P3/00 ,  F02P9/00 ,  F02P9/002 ,  F02P15/10

Abstract: In an ignition device, a second circuit energizes a primary coil from its negative side in a first direction to thereby maintain energization of a second coil in a second direction during spark discharge started by a first circuit. The maintained energization continuously supplies energy to a spark plug, thus performing a continuation of the spark discharge. The first direction is opposite to a direction of energization of the primary coil carried out by the first circuit, and the second direction is the same as a direction of energization of the second coil that has been started based on the first circuit. A humidity detection unit detects humidity of intake air into an engine. The control section controls the first circuit to advance start timing of the spark discharge generated by the first circuit in accordance with an increase in the humidity of the intake air.