Denso Corporation

Nippon Soken, Inc.

Fumiaki Arikawa

Jun Kondo

Tooru Taguchi

Akitoshi Yamanaka

Kazufumi Serizawa

Daiji Ueda

Naoki Mitsumata

Motoya Kanbara

Toshiaki Hijima

Katsuhiro Ichihashi

Yuuta Hashimoto

Atsushi Utsunomiya

Mitsuo Inagaki

Shinya Sano

Akikazu Kojima

Tomoki Fujino

Hiroki Tanada

Hideo Naruse

Takayuki Takeuchi

Shinji Miyoshi

Yoshihiro Tsuzuki

Yoshiharu Nonoyama

Hiroyasu Kanamori

Naoki Toda

Fumihiro Fujikake

Hitoshi Maegawa

Masahiro Watanabe

Satoshi Sugawara

An electromagnetic valve includes a driving portion, a valve body, and a valve element. The driving portion generates a magnetic attractive force according to an energization. The valve body has an orifice through which a fluid flows, and a valve seat around an opening portion of the orifice. The valve element displaces according to the magnetic attractive force and a fluid force that is applied from the fluid, to vary a passage area between the valve element and the valve seat. When the valve element is placed at a position separated farthest from the valve seat, the passage area between the valve element and the valve seat is less than or equal to a passage area of the orifice.

Electromagnetic valve

A fuel injection valve includes a body including a first chamber that supplies fuel of a first pressure, a second chamber that supplies fuel of a second pressure, and an injection hole, a valve chamber member including a valve chamber connectable to the first chamber and the second chamber, a control chamber member including a control chamber connectable to the first chamber, a needle pressed by pressure of fuel in the control chamber in a direction that causes fuel injection from the injection hole to stop, an actuator, a valve element that selectively connects the first chamber, second chamber, and the valve chamber according to the actuator extending and contracting, and a transmission mechanism that when the actuator extends, transmits the force to the needle as a force in a direction that causes fuel to be injected from the injection hole.

Fuel injection valve and fuel injection valve controller

In a nozzle, in a cross section including an axis of a nozzle body, a side surface and a seat surface are both smoothly connected to an arc of a circle inscribing both the side surface and the seat surface. A part of a needle which is adjacent to a tip end side of a seat portion is a cone having a diameter reduced toward a tip end side of the cone in the axial direction. Thus, no corner is on the seat surface or the side surface, and the two surfaces form one curved surface. Since a cavitation generated in a sack chamber can be reduced, even when an injection quantity is significantly small such that an injection port does not throttle an injection flow, a flow coefficient of the injection flow is improved and a penetration of a spray of the fuel can be maintained.

Fuel injection nozzle

A fuel injector has a cylindrical nozzle body, a nozzle needle, a pressure chamber and an injection passage. The injection passage includes a first hole and a second hole. A minimum vertical distance between an outer periphery of a first nozzle hole outlet and a contact point relative to an axial center line of the first hole is defined as a vertical distance R. A minimum axial distance between the first nozzle hole outlet and the contact point relative to an axial center line of the first hole is defined as an axial distance L. An angle between the axial center line of the first nozzle hole and the outer periphery line of the fuel spray is defined as an injection angle &#x3b8;. The vertical distance R, the axial distance L and the injection angle &#x3b8; satisfy a formula: R/(L&#xd7;tan &#x3b8;)&#x3e;6.0.

Fuel injector

An armature chamber receives an armature and includes a first armature chamber, which is placed adjacent to one end surface of the armature and is communicated with a spring chamber, and a second armature chamber, which is placed adjacent to the other end surface of the armature, which is opposite from the one end surface of the armature. The armature includes a primary communication passage that communicates between the first armature chamber and the second armature chamber. An opening end of the primary communication passage, which opens on a side where the first armature chamber is located, is placed at a corresponding location of the armature, which is opposed to the spring chamber.

Solenoid valve

A first resilient member generates a resilient force to urge a valve portion in a valve-closing direction. A second resilient member generates a resilient force against the resilient force of the first resilient member. The resilient force of the first resilient member and the resilient force of the second resilient member are set to be balanced with each other when the valve portion is placed in a lift position that is between a full-closing position of the valve portion, in which the valve portion is seated against a valve seat to fully close a fluid passage, and a full-opening position of the valve portion, in which the valve portion is fully lifted away from the valve seat to fully open the fluid passage.

Pressure control apparatus

It is equipped with an injector bodywhich has formed therein high-pressure paths, andthrough which high-pressure fuel flows to a spray hole and stores therein a piezo-actuator(i.e., an opening/closing mechanism) and a back-pressure control mechanism(i.e., an opening/closing mechanism) which open or close the spray hole, a stem(i.e., an elastic body) which is installed in said bodyand elastically deformed when subjected to pressure of the high-pressure fluid, and a strain gauge(i.e., a sensing device) which converts the degree of strain occurring at the steminto an electric signal and outputs it as a measured-pressure signal. Specifically, the stain gaugeis installed on the stemthat is constructed as being separate from the body

Fuel injection valve and fuel injection device

A fuel injector for an internal combustion engine is provided. The fuel injector is equipped with a fuel pressure sensor which is installed in a metallic injector body. The fuel injector also includes an amplifier working to amplify an output of the fuel pressure sensor and a thermal insulating member disposed between the metallic injector body and the amplifier to shield the amplifier thermally, thereby ensuring the accuracy in measuring the pressure of fuel within the fuel injector.

Fuel injector with fuel pressure sensor

It is equipped with an injector bodywhich has formed therein high-pressure paths, andthrough which high-pressure fuel flows to a spray hole and stores therein a piezo-actuator(i.e., an opening/closing mechanism) and a back-pressure control mechanism(i.e., an opening/closing mechanism) which open or close the spray hole, and a fuel pressure sensorinstalled in the bodyto measure the pressure of the high-pressure fuel. The bodyhas formed therein a branch pathdiverging from the high-pressure pathsandto deliver the high-pressure fuel to the fuel pressure sensor

A fuel injector for an internal combustion engine is provided. The fuel injector is to be installed in a cylinder head of the engine and has a fuel pressure sensor working to measure the pressure of fuel within a injector body. The fuel pressure sensor is installed in a portion of the injector body which is to be located away from the cylinder head of the engine across a portion of the injector body on which a mechanical pressure is exerted by an external member such as a fuel supply pipe or a fuel drain pipe, thereby keeping the fuel pressure sensor free from internal stress, as arising from the mechanical pressure exerted on the injector body, to ensure the accuracy in measuring the pressure of the fuel.

Fuel injector designed to minimize mechanical stress on fuel pressure sensor installed therein

A fuel injector for an internal combustion engine is provided. The fuel injector is equipped with a fuel pressure sensor, a sensor circuit such as an amplifier, and a valve actuator such as a piezoelectric actuator. The fuel injector also includes a conductive shield which is disposed between the sensor circuit and actuator drive terminals to supply electric power to the actuator and works to shield the sensor circuit from electric noises arising from the drive terminals, thereby minimizing the addition of the noises to an output of the fuel pressure sensor, as being processed in the sensor circuit, and ensuring the accuracy in determining the pressure of fuel based on the output of the fuel pressure sensor.

Fuel injector with electric shield

An electromagnetic apparatus for driving a valve such as an intake valve of an internal combustion engine drives the valve to its closing position without generating vibration and noises which are detrimental to durability and reliability of the valve. The valve speed is controlled either mechanically or electrically so that it is reduced to substantially zero when the valve sits on a valve seat. To mechanically control the valve speed, air or magnetic liquid is used as a cushion against the valve movement, or springs having a non-linear spring modulus such as a double-spring or a barrel spring are used to bias the valve movement. To electrically control the valve speed, an electrical signal representing the valve position is used to determine energization timing of the solenoids which drive the valve to an open or closing position. Such electrical signal is generated by an eddy current, resistance or spring load detector.

Electromagnetic valve driving apparatus

For regenerating an exhaust gas particulate collecting filter, there is provided an exhaust gas particulate purifying process in which damage to the filter caused by a thermal action can be prevented and further electric power can be saved when an electric current supply to an electric heater attached to the filter is controlled. In the filter container (4), an electric heater (21) is provided on an end surface of the filter on an upstream side with respect to a regenerating gas flow, or provided at a position close to the end surface. Also, a temperature sensor (22) for measuring a temperature of the filter is provided inside the filter or at a position close to an end surface of the filter opposite to the aforementioned end surface. Further, there is provided a first controller (13) for determining an appropriate current amount to be supplied to the electric heater and also for determined an electric power reducing pattern used in the case of stoppage of power supply, in accordance With the filter preheating temperature immediately before the start of regeneration detected by the temperature sensor (22). A second controller ( 17) controls a current amount supplied to the electric heater (21) in accordance with a command given by the first controller (13).

Growing community of inventors

Okazaki, Japan

Fumiaki Arikawa