公开(公告)号：US10686299B2

公开(公告)日：2020-06-16

申请号：US16509911

申请日：2019-07-12

Applicant: DENSO CORPORATION

Inventor： Yasuomi Imanaka ,  Masamichi Shibata

IPC: H01T13/04 ,  H01T13/08 ,  H01T13/20

Abstract: A spark plug has a spark plug housing of a cylindrical shape, an insulator of a cylindrical shape, a central electrode, a ground electrode and a terminal metal fitting. The insulator has a head part projecting toward a distal end side of the spark plug from the spark plug housing. The central electrode and the ground electrode forms a discharge gap. The terminal metal fitting, electrically connected to the central electrode, has a main body part and an exposed part. The exposed part of the terminal metal fitting has a head part. An outer diameter of the head part of the exposed part is greater than an outer diameter of the main body part. A ratio Dt/Di of not less than 0.8 is satisfied, Di represents an outer diameter of the head part of the insulator and Dt represents an outer diameter of the head part of the exposed part.

公开(公告)号：US10801461B2

公开(公告)日：2020-10-13

申请号：US15302034

申请日：2015-04-02

Applicant: DENSO CORPORATION

Inventor： Yasuomi Imanaka ,  Kaori Doi

IPC: F02P3/05 ,  F02P3/08 ,  F02P5/15 ,  F02P15/10 ,  F02P17/12 ,  F02P3/02 ,  F02D35/02 ,  F02P3/04 ,  F02P9/00

Abstract: An ignition apparatus performs energy input control in which energy is continuously inputted to an ignition coil to enable a spark discharge in a predetermined energy input period after interrupting a primary current by an ignition switch and generating a discharge of a spark plug by a secondary current. A combustion state determination circuit determines a combustion state by comparing a combustion pressure P detected by a combustion state detector. When the combustion pressure P is smaller than a second threshold Pth2, and there is room for improving the combustion state with respect to the present energy input condition, the energy input period IGW is increased or a target secondary current I2* is increased. By compensating the condition of the energy input control in accordance with the combustion state, a target combustion state can be achieved with just enough energy consumption.

公开(公告)号：US09954344B2

公开(公告)日：2018-04-24

申请号：US15550458

申请日：2016-02-10

Applicant: DENSO CORPORATION

Inventor： Kenji Hattori ,  Masamichi Shibata ,  Toshiya Nakamura ,  Yasuomi Imanaka ,  Hirofumi Suzuki ,  Hiroshi Araki ,  Tomoyuki Watanabe ,  Shin Hase

IPC: H01T13/41 ,  H01T13/40 ,  H01C13/00 ,  F02P15/00

CPC classification number: H01T13/41 ,  F02P13/00 ,  F02P15/00 ,  H01C13/00 ,  H01T13/20

Abstract: A spark plug 1 includes a cylindrical housing, a cylindrical insulator, a center electrode, a terminal bracket, a ground electrode, and a resistor. The insulator is held on the inside of the housing. The center electrode 4 is held on the inside of the insulator, with a tip end being projected therefrom. The terminal bracket is held on the inside of the insulator, with a base end part and being projected therefrom. The ground electrode forms a spark discharge gap G between itself and the center electrode. The resistor contains carbon and is disposed on the inside of the insulator so as to be located between the center electrode 4 and the terminal bracket. In an axial direction X of the spark plug, the resistor has a higher carbon content in a first region positioned on a tip side, compared to a second region positioned on a base end side.

公开(公告)号：US11754032B2

公开(公告)日：2023-09-12

申请号：US17874671

申请日：2022-07-27

Applicant: DENSO CORPORATION

Inventor： Yasuomi Imanaka ,  Ryo Tamura ,  Yuji Kaji ,  Atsushi Iwami ,  Tatsuya Oka ,  Yuuta Kawashima

IPC: F02P5/15 ,  F02P9/00

CPC classification number: F02P5/15 ,  F02P9/002

Abstract: An ignition system has an ignition plug and an ignition control unit that controls the ignition plug. When an engine is in a predetermined operating state, the ignition control unit performs ignition control after top dead center to perform ignition after the compression top dead center. The ignition system has an airflow support structure that facilitates the flow of airflow through a discharge gap at least after the compression top dead center. The ignition system is configured such that due to the airflow support structure and the timing of the ignition, airflow at a flow rate of 5 m/s or more flows through the discharge gap during a spark period after top dead center, which is the generation period of the discharge spark in the ignition control after top dead center.

公开(公告)号：US09488151B2

公开(公告)日：2016-11-08

申请号：US13722453

申请日：2012-12-20

Applicant: DENSO CORPORATION

Inventor： Masamichi Shibata ,  Atsuya Mizutani ,  Koichi Hattori ,  Yasuomi Imanaka

IPC: F02P1/08 ,  H01T13/44 ,  F02P3/02 ,  F02P3/055 ,  F02P3/04

CPC classification number: F02P1/083 ,  F02P3/02 ,  F02P3/0407 ,  F02P3/0442 ,  F02P3/0552 ,  H01T13/44

Abstract: An ignition system is provided, in which a Zener diode is connected in parallel with a spark plug, to suppress torque variation from becoming large in an engine when deterioration of the spark plug is advanced. Specifically, the ignition system includes a secondary coil having an end connected to a center electrode of the spark plug via a connecting path. The connecting path is connected to a constant-voltage path having a grounded end and including the Zener diode. The time from when an ignition signal is switched off until when ignition timing occurs is measured for a plurality of times. The difference between a maximum value and a minimum value among the plurality of measurements is defined to be a variation range. A breakdown voltage of the Zener diode is adjusted based on requirements such as for rendering the variation range to be a predetermined time or smaller.

Abstract translation: 提供了一种点火系统，其中齐纳二极管与火花塞并联连接，以在火花塞的劣化提前时抑制发动机中的扭矩变化变大。 具体来说，该点火系统包括一个次级线圈，其一端通过连接路径连接到火花塞的中心电极。 连接路径连接到具有接地端并包括齐纳二极管的恒定电压路径。 从点火信号关闭直到点火正时发生的时间被测量多次。 多个测量中的最大值和最小值之间的差定义为变化范围。 齐纳二极管的击穿电压根据要求进行调整，例如使变化范围为预定时间或更短。

公开(公告)号：US10082125B2

公开(公告)日：2018-09-25

申请号：US15302072

申请日：2015-04-09

Applicant: DENSO CORPORATION

Inventor： Hidekazu Fujimoto ,  Makoto Toriyama ,  Satoru Nakayama ,  Yasuomi Imanaka ,  Kanechiyo Terada ,  Shunichi Takeda ,  Kaori Doi ,  Junichi Wada ,  Hisaharu Morita ,  Naohisa Nakamura

IPC: F02P11/06 ,  F02P3/05 ,  F02P9/00 ,  F02D9/08 ,  F02D37/02 ,  F02D41/22 ,  F02D41/30

CPC classification number: F02P11/06 ,  F02D9/08 ,  F02D37/02 ,  F02D41/0002 ,  F02D41/20 ,  F02D41/22 ,  F02D41/221 ,  F02D41/3005 ,  F02D2041/2058 ,  F02D2041/227 ,  F02P3/053 ,  F02P5/1502 ,  F02P9/002 ,  F02P9/007 ,  F02P15/10 ,  F02P17/00 ,  Y02T10/42 ,  Y02T10/46

Abstract: In a control apparatus, a discharge control unit controls an igniter unit so that a flow of current from a primary coil towards a ground side is blocked, thereby generating a high voltage in a secondary coil, and controls a spark plug so that the spark plug generates electric discharge. An energy input control unit controls an energy input unit so as to input electrical energy to an ignition coil after the start of control of the spark plug by the discharge control unit. A control unit and an abnormality detecting unit detects an abnormality in the igniter unit or the ignition coil based on a first threshold and a first current value that is a value corresponding to a current detected by a current detection circuit at this time, when a first predetermined period elapses after the start of control of the spark plug by the discharge control unit.

公开(公告)号：US09127638B2

公开(公告)日：2015-09-08

申请号：US13757987

申请日：2013-02-04

Applicant: DENSO CORPORATION

Inventor： Masamichi Shibata ,  Atsuya Mizutani ,  Yasuomi Imanaka ,  Koichi Hattori

IPC: F02P5/00 ,  F02P17/12 ,  F02P3/04 ,  F02P11/06

CPC classification number: F02P17/12 ,  F02P3/0414 ,  F02P11/06

Abstract: A control apparatus for an ignition system of an internal combustion engine which can appropriately judge deterioration of a spark plug is disclosed. The ignition system includes a spark plug and a Zener diode. These are connected in parallel. In the ignition system, a constant-voltage path whose one of two ends is grounded is connected to the connecting path which connects the center electrode of the spark plug to a secondary coil. The constant-voltage path includes a Zener diode and a resistor. In a case where electric current is detected at the resister in a term from the start of current supply to a primary coil to the end, the control apparatus judges the spark plug being deteriorated.

Abstract translation: 公开了一种可以适当地判断火花塞的劣化的用于内燃机的点火系统的控制装置。 点火系统包括火花塞和齐纳二极管。 这些并行连接。 在点火系统中，两端接地的恒压路径连接到将火花塞的中心电极连接到次级线圈的连接路径上。 恒定电压路径包括齐纳二极管和电阻。 在从电流供应开始到初级线圈到末端的术语中，在电阻器处检测到电流的情况下，控制装置判断火花塞劣化。

公开(公告)号：US09086046B2

公开(公告)日：2015-07-21

申请号：US13648483

申请日：2012-10-10

Applicant: DENSO CORPORATION

Inventor： Yuji Kajita ,  Masamichi Shibata ,  Yasuomi Imanaka ,  Atsuya Mizutani ,  Tsutomu Oosuka

IPC: F02P3/04 ,  F02P13/00 ,  F02P3/08 ,  F02P9/00 ,  F02P15/00 ,  F02P3/05

CPC classification number: F02P13/00 ,  F02P3/04 ,  F02P3/051 ,  F02P3/053 ,  F02P3/0838 ,  F02P3/0884 ,  F02P9/00 ,  F02P15/00

Abstract: An ignition apparatus is provided with a Zener diode as a limiter device, which limits a primary voltage of an ignition coil to be less than a Zener voltage, and a switching circuit, which prohibits a limiter function of the Zener diode at a start of discharge and switches the limiter device to perform the limiter function for a predetermined time period following the start of discharge. A secondary voltage is limited to be more than a secondary limit value. Even when blowout arises in discharging, re-discharging is avoided from arising immediately after the blowout and exhaustion of a spark plug caused by repetition of discharging is avoided.

Abstract translation: 点火装置设有齐纳二极管作为限制装置，其将点火线圈的初级电压限制为小于齐纳电压;以及开关电路，其在开始放电时禁止齐纳二极管的限幅器功能 并且在放电开始之后的预定时间段内切换限制器件以执行限制器功能。 次级电压被限制为大于次级限制值。 即使在排出时产生喷出，也避免了在由于重复放电引起的火花塞的喷出和排出之后立即产生再排放。

公开(公告)号：US09022010B2

公开(公告)日：2015-05-05

申请号：US13758428

申请日：2013-02-04

Applicant: Denso Corporation

Inventor： Masamichi Shibata ,  Yuji Kajita ,  Atsuya Mizutani ,  Koichi Hattori ,  Yasuomi Imanaka

IPC: F02P1/08 ,  H01T13/44 ,  F02P3/055 ,  F02P9/00 ,  F02P3/04

CPC classification number: H01T13/44 ,  F02P3/0407 ,  F02P3/0552 ,  F02P9/002

Abstract: An ignition system is provided, which can restrict decreasing of constant-voltage duration of a spark plug and effectively prevents the occurrence of an accidental fire in an engine. A typical ignition system includes a secondary coil having one end connected to a positive side of a battery via a low-voltage side path and the other end connected to a center electrode via a connecting path which connects the secondary coil and the spark plug. A constant-voltage path having a grounded end is connected to the connecting path. A block diode is arranged between the secondary coil and a point where the constant-voltage path is connected with the connecting path. A Zener diode is disposed within the constant-voltage path. Each anode of the block diode and the Zener diode is mutually connected.

Abstract translation: 提供一种点火系统，其可以限制火花塞的恒定电压持续时间的降低，并有效地防止发动机中发生意外的火灾。 典型的点火系统包括一个次级线圈，其一端通过低压侧路径连接到电池的正极侧，另一端经由连接次级线圈和火花塞的连接路径连接到中心电极。 具有接地端的恒定电压路径连接到连接路径。 在次级线圈和恒定电压路径与连接路径连接的点之间布置有块二极管。 齐纳二极管设置在恒压通路内。 块二极管和齐纳二极管的每个阳极相互连接。