公开(公告)号：US20140361679A1

公开(公告)日：2014-12-11

申请号：US14299276

申请日：2014-06-09

Applicant: DENSO CORPORATION

Inventor： Nobuo ABE ,  Yuki MURAYAMA

IPC: H01T13/39 ,  H01T21/02 ,  F02P3/02

CPC classification number: H01T13/39 ,  F02P3/02 ,  H01T21/02

Abstract: In a spark plug, a center electrode includes a base member and a discharge chip that has a higher melting point than the base member. The base member and the discharge chip are joined to each other by both a weld and a diffusion layer. The weld is formed, by fusion welding, along an outer periphery of an interface between the base member and the discharge chip into an annular shape. The weld is made up of those parts of the base member and the discharge chip which are molten and mixed together during the fusion welding and solidified after the fusion welding. The diffusion layer is formed radially inside the annular weld. The diffusion layer is made up of those parts of the base member and the discharge chip which are diffused into each other across the interface between the base member and the discharge chip.

Abstract translation: 在火花塞中，中心电极具有底座部件和熔点高于基体部件的放电芯片。 基底部件和放电芯片通过焊接和扩散层彼此接合。 通过熔焊将基体与排出芯片的界面的外周形成为环状。 焊接由在熔融焊接期间熔融混合在一起并在熔焊之后凝固的基础部件和排出芯片的那些部分组成。 扩散层径向地形成在环形焊缝内。 扩散层由基材和放电芯片的那些部分构成，这些部分在基底部件和放电芯片之间的界面上彼此扩散。

公开(公告)号：US20140091701A1

公开(公告)日：2014-04-03

申请号：US14040958

申请日：2013-09-30

Applicant: ISHIFUKU Metal Industry Co., Ltd. ,  Denso Corporation

Inventor： Yuki MURAYAMA ,  Nobuo ABE ,  Yoshinori DOI ,  Toshiyuki TOMINE

IPC: H01T13/39

CPC classification number: H01T13/39

Abstract: A spark plug for use in an internal combustion engine has a center electrode, an earth electrode, and an electrode chip formed on at least one of the center electrode and the earth electrode. A spark discharge gap is formed between the center electrode and the earth electrode. The electrode chip has a base section, a chromium rich layer formed on at least a part of the base section, and a diffusion layer formed between the base section and the chromium rich layer. The base section contains chromium within a range of 5 to 45 mass %, an element X within a range of 0.5 to 25 mass %, and a remainder composed of tungsten and unavoidable impurity. The chromium rich layer is larger in content of chromium than the base section. The element X contained in the base section is comprised of at least one of molybdenum, silicon, aluminum and lead.

Abstract translation: 用于内燃机的火花塞具有形成在至少一个中心电极和接地电极上的中心电极，接地电极和电极芯片。 在中心电极和接地电极之间形成火花放电间隙。 所述电极芯片具有基部，在所述基部的至少一部分上形成的富铬层，以及形成在所述基部与所述富铬层之间的扩散层。 基部包含5〜45质量％范围的铬，0.5〜25质量％范围内的元素X，余量由钨和不可避免的杂质构成。 铬含量比基体部分含铬量大。 包含在基部中的元素X由钼，硅，铝和铅中的至少一种构成。

公开(公告)号：US20200088673A1

公开(公告)日：2020-03-19

申请号：US16692339

申请日：2019-11-22

Applicant: DENSO CORPORATION

Inventor： Tadakatsu KOYABU ,  Yuki MURAYAMA ,  Ryozo KAYAMA ,  Akari HASEGAWA ,  Yusuke KAWAMOTO

IPC: G01N27/416 ,  G01N27/407

Abstract: Each of SCUs to includes: a voltage switching unit that performs a first voltage switching to increase an oxygen concentration in a gas chamber and a second voltage switching to decrease the oxygen concentration in the gas chamber after the execution of the first voltage switching; an output change calculation unit that calculates an output change parameter indicating a change in output of the sensor cell according to the voltage switching; a concentration difference calculation unit that calculates a concentration difference parameter indicating a concentration difference in the oxygen concentration or in the concentration of the specific gas in the detection target gas between before the first voltage switching and after the second voltage switching; and a deterioration determination unit that determines a deterioration state of the sensor cell based on the output change parameter and the concentration difference parameter.

公开(公告)号：US20180038338A1

公开(公告)日：2018-02-08

申请号：US15667923

申请日：2017-08-03

Applicant: DENSO CORPORATION

Inventor： Akimitsu SUGIURA ,  Kaori DOI ,  Yuki MURAYAMA ,  Fumiaki AOKI ,  Noriaki NISHIO

IPC: F02P15/10 ,  F02P5/15

Abstract: An ignition apparatus for an internal combustion engine provided with an ignition coil and a spark plug. An ECU enables operation of a plurality of continuous discharges in the spark plug and also detects a flow speed of a combustible air/fuel mixture. In a first discharge, a supply of a primary current terminates the first discharge, with energy remaining in the ignition coil, from an initiation of the ignition to an initiation of the spark plug, when the detected flow speed exceeds a predetermined first threshold. Thereafter, a second discharge is performed by shutting off the primary current.