公开(公告)号：US20200049120A1

公开(公告)日：2020-02-13

申请号：US16656923

申请日：2019-10-18

Applicant: DENSO CORPORATION

Inventor： Takashi OHNO

IPC: F02P3/04 ,  F02D41/30 ,  F02P3/10

Abstract: An internal combustion engine ignition system includes: a primary coil provided with a center tap; a third switching element that interrupts and conducts a primary current flowing from a voltage application unit to the center tap; a first switching element connected to one end on a first winding side; a second switching element connected to the other end on a second winding side; an ignition control circuit that controls operation of each of the above switching elements, thereby performing discharge generation control that allows an ignition plug to generate a spark discharge, and thereby interrupting and conducting the primary current flowing to the second winding to perform discharge maintenance control that maintains the spark discharge generated in the ignition plug; and a current circulation path that circulates a current flowing from the second winding to the second switching element.

公开(公告)号：US20180358782A1

公开(公告)日：2018-12-13

申请号：US15997993

申请日：2018-06-05

Applicant: DENSO CORPORATION

Inventor： Keiko MIYAKE ,  Takashi OHNO ,  Shunichi TAKEDA ,  Kanechiyo TERADA

IPC: H01T13/04 ,  F02P7/077

CPC classification number: H01T13/04 ,  F02P3/01 ,  F02P3/0442 ,  F02P3/053 ,  F02P7/077 ,  F02P9/007 ,  F02P15/10 ,  F02P2017/121

Abstract: An ignition device for generating a spark discharge at a spark plug based on a first voltage from a first supply and a second voltage from a second supply. The second voltage is higher than the first voltage. In the ignition device, a primary coil includes a center tap, a first terminal on a ground side of the center tap, and a second terminal on a first-supply side of the center tap, and a secondary coil is electromagnetically coupled to the primary coil and electrically connected to the spark plug. A first switch is configured to make or break an electrical connection between the first terminal and ground, a second switch is configured to make or break an electrical connection between the second supply and the center tap, and a third switch is configured to pass or interrupt a current from the second terminal to the first supply. A controller is configured to control an on/off state of each of the first to third switches.

公开(公告)号：US20220213858A1

公开(公告)日：2022-07-07

申请号：US17704664

申请日：2022-03-25

Applicant: DENSO CORPORATION

Inventor： Keiko MIYAKE ,  Takashi OHNO

IPC: F02P3/05 ,  F02P5/145

Abstract: An internal combustion engine ignition device includes an ignition coil, an ignition plug, a main ignition circuit, and an energy input circuit. A first switching element of the main ignition circuit performs energization and interruption of energization to a first coil part of a primary coil to generate an induced electromotive force using a DC voltage. A second switching element of the energy input circuit performs energization and interruption of energization to a second coil part of the primary coil to keep a discharge current in a secondary coil within an intended range directly using the DC voltage, after the induced electromotive force has been generated. A soft-off circuit of the energy input circuit slows a turn-off speed of the second switching element. The energy input circuit is configured to, when decreasing a signal voltage added to a gate of the second switching element, execute a first decreasing stage of decreasing the signal voltage until it reaches the vicinity of a gate-source threshold voltage and a second decreasing stage of gradually decreasing the signal voltage in the vicinity of the threshold voltage.

公开(公告)号：US20210388805A1

公开(公告)日：2021-12-16

申请号：US17412785

申请日：2021-08-26

Applicant: DENSO CORPORATION

Inventor： Keiko MIYAKE ,  Takashi OHNO ,  Kanechiyo TERADA

IPC: F02P3/04 ,  H01T15/00

Abstract: An ignition device for an internal combustion engine includes: an ignition plug; a primary coil; a secondary coil magnetically linked to the primary coil and connected to the ignition plug; a main ignition circuit causing a spark discharge to occur in the ignition plug; an energy supply circuit that supplies and stops electrical energy to the predetermined winding of the primary coil to accordingly cause the spark discharge to continue; a recirculation circuit that permits and prohibits current recirculation through a recirculation path including the predetermined winding; and a controller configured to: control the main ignition circuit, and determine a start time of a permission of the current recirculation by the recirculation circuit using, as a trigger, the interruption signal which causes the main ignition circuit to interrupt the current through the primary coil, and end the permission after a predetermined time period has elapsed since the start time.