Hitachi, Ltd.

Other

Hitachi Car Engineering Co., Ltd.

Nissan Motor Company Limited

Hiromasa Kubo

Yoshio Okamoto

Makoto Yamakado

Yuzo Kadomukai

Yoshiyuki Tanabe

Yasunaga Hamada

Yasuo Namaizawa

Kenji Tabuchi

Ayumu Miyajima

Shigenori Togashi

Toshio Takahata

Hiroshi Fujii

Nobukatsu Arai

Motoyuki Abe

Tohru Ishikawa

Toru Ishikawa

Kiyoshi Amo

Masahiro Souma

Yzo Kadomukai

Toshiharu Nogi

Hatsuo Nagaishi

Masaaki Uchida

Noriyuki Maekawa

Kiyotaka Ogura

Atsushi Sekine

Hiromichi Miwa

Mizuho Yokoyama

Kiyoshi Amou

Eiichi Kubota

Keiichi Uraki

Hiroshi Sanbuichi

Yasuo Seimiya

Masafumi Nakano

Tooru Ishikawa

Using a swirl type fuel injection valve, a concentrated spray area and a thin spray area are formed, the positions thereof are adjusted, and the spray is made to conform to the geometric shape of the engine and mounting position of the fuel injection valve, so as to reduce the fuel consumption and control the unburnt components in exhaust gas. The fuel injection valve is so constructed that a step is formed on the injection hole opening of the fuel injection valve, so as to provide two or more edge transition portions at the injection hole opening, resulting from the step, and the line connecting the edge transition portions forms an oblique angle relative to the wall formed by the step perpendicular to the injection hole center axis and the angled wall.

Fuel injection valve with restriction wall, and internal combustion engine equipped therewith

At an outlet portion of an injection hole () of a fuel injection valve (), through removal of a part (AB) of a wall forming the injection hole (), a restriction to a spray flow is released, thereby, a deflection spray is formed in which the spray is rich at the side of restriction released and is learn at the side of restricted, accordingly, ignition property of an internal combustion engine is improved, and an optimum spray is realized which reduces exhaust amount of unburnt gas components.

Fuel injection valve and internal combustion engine mounting the same

A fuel swirler positioned upstream of an injection orifice is disposed at the tip of a nozzle body in a fuel injector, in which the fixed core and the nozzle body are coupled to each other via a non-magnetic cylindrical seal ring press-fitted and welded to the outer circumference of one end on the nozzle body side of the fixed core and the inner circumference of one end of the nozzle body. The inner circumference of the fuel swirler and the inner circumference of the seal ring function serve as a guide for slidably guiding a stroke movement of the needle. The fuel swirler is held between the receiving surface of the nozzle body and the orifice plate, thus defining an annular fuel passage between the outer circumference of the fuel swirler and the inner circumference of the nozzle body, so that fuel flows into a passage groove formed at the lower end surface of the fuel swirler via the annular fuel passage. A mass movable in an axial direction independently of the needle is interposed between the return spring and the needle, and a plate spring is interposed between the mass and the needle.

Fuel injection valve

For each of the injection holes on the face of a plate member which is disposed in a fuel passage, grooves are provided which run along the circumferential direction of the respective injection holes, and at the positions of the grooves, fuel overflows are formed. As a result, contracted fuel flow portions are formed in the injection holes, so that the maximum flow velocity of fuel is increased at the injection hole outlet portions. Thus, a fuel injection valve for an internal combustion engine is provided, in which the atomization performance near the injection holes is effectively enhanced.

Using a swirl type fuel injection valve, a concentrated spray area and a thin spray area are formed, the position thereof are adjusted, and the spray is made to conform to the geometric shape of the engine and mounting position of the fuel injection valve, so as to reduce the fuel consumption and control the unburnt components in exhaust gas. The fuel injection valve is so constructed that a step is formed on the injection hole opening of the fuel injection valve, so as to provide two or more edge transition portions at the injection hole opening, resulting from the step, and the line connecting the edge transition portions forms an oblique angle relative to the wall formed by the step perpendicular to the injection hole center axis and the angled wall.

Manufacturing method of a fuel injection valve; and a fuel injection valve and an internal combustion engine equipped therewith

At an outlet portion of an injection hole ( ) of a fuel injection valve ( ), through removal of a part (A B) of a wall forming the injection hole ( ), a restriction to a spray flow is released, thereby, a deflection spray is formed in which the spray is rich at the side of restriction released and is learn at the side of restricted, accordingly, ignition property of an internal combustion engine is improved, and an optimum spray is realized which reduces exhaust amount of unburnt gas components.

A fuel spray is directed toward an ignition plug. To an injection bole outlet portion of a swirl type fuel injector, an L-shaped cut out is provided, and the fuel spray is formed with a deflection fuel spray which has a strong swirl component that can inject with a large quantity. Accordingly, a reduction in the discharge HC amount and an improvement in the fuel consumption can be attained.

Internal combustion engine

The present invention provides a fuel injection valve including a stationary core and a movable core having one end opposed to one end of the stationary core, the movable core being movable toward the one end of the stationary core upon magnetization of the stationary core and a valve on the other end of the movable core and movable with the movable core, the valve being supported by a valve seat base and a cylindrical body extends from at least the stationary core to the base.

Electromagnetic fuel injection valve

An electromagnetic fuel injector is provided with a first coil having a large rate of change in time of magnetomotive force and a second coil having a smaller rate of change in time of magnetomotive force than the first coil. During a valve opening operation at the time of opening the valve, current is passed through at least the first coil, and then current of a smaller current value than in the opening operation is caused to flow so as to hold the valve open, using the first and second coils.

Fuel injection apparatus, fuel injection method and internal combustion engine

A fuel injection apparatus including a controller to output an injection time command signal and an opening movement time command signal to command an opening movement time from a closed state to an open state of an electromagnetic fuel injection valve and a control circuit, coupled to the controller, to change an electric current flowing in a coil of the electromagnetic fuel injection valve between when the electromagnetic fuel injection valve is closed and opened. The controller sends both the injection time command signal and the opening movement time command signal through the same signal line to the control circuit.

Electromagnetic fuel injector and control method thereof

The target peak current value, where a current value is reduced in conformity to a drop in the voltage of a battery is stored in target peak current storage unit . ON-signals are sent from current control circuit to power transistor in response to the injection command pulse coming from engine controller so that current is applied to coil . Then, the current flowing to coil is detected by the current detecting resistor . Comparator compares this detected current and the target peak current value read from the target peak current storage unit conforming to the voltage of battery . If agreement is found between these two values, OFF-signals are sent to power transistor from current control circuit in response to the switching command coming from comparator . Then, On/Off signals to effect holding of the coil are sent from current control circuit to power transistor . The linearity of the injection volume despite changes in battery voltage can be maintained.

Fuel injector and internal combustion engine

Using a control coil having a high response characteristic suited to the valve opening and a hold coil suited to a hold to be held a large force by a small large current, during the valve opening time a high voltage is applied to the control coil suited to the valve opening and during a valve opening hold time a low and stabilized voltage is applied to the hold coil suite to the holding, and then a valve body driven. In a fuel injection apparatus, a drive manner during a valve opening time and a hold time is optimized.

Electromagnetic fuel injection apparatus, an internal combustion engine having an electromagnetic fuel injection apparatus, and a drive circuit of an electromagnetic fuel injection apparatus

At an outlet portion of an injection hole ( ) of a fuel injection valve ( ), through removal of a part (A B) of a wall forming the injection hole ( ), a restriction to a spray flow is eliminated, thereby, a deflection of the spray occurs in which the spray is rich at the side where this restriction is released and is lean at the side that is restricted. Thus, the ignition property of an internal combustion engine is improved, and an optimum spray is realized which reduces the amount of unburnt gas components being exhausted.

An electromagnetic fuel injection valve in an engine injects fuel by opening/closing a fuel flowing path with a valve element. A controller controls opening/closing of the fuel flowing path and changes magnetic force generated by a control coil driving the valve element so that the magnetic force is less during a valve open state-holding period than at an initial valve-opening time. The controller detects the voltage of a battery and applies the voltage fed from the battery to the control coil, while changing a time interval (Tc), for which current is passed through the control coil, based on the detected voltage, in order to change the magnetic force, without raising the voltage from the battery. The controller also detects increase/decrease of a pressing force on the valve element caused by fuel pressure and changes the time interval (Tc) accordingly.

Using a control coil having a high response characteristic suited to valve opening and a hold coil suited to a hold to valve open during fuel injection using a small current, during the valve opening time, a high voltage is applied to the control coil suited to the valve opening operation and, during the time the valve is to be held open a low and stabilized voltage is applied to the hold coil. In a fuel injection apparatus, drive manner employed during a valve opening time and a valve hold time is optimized.

Electromagnetic system fuel injection apparatus an internal combustion engine having an electromagnetic system fuel injection apparatus, and a drive circuit of an electromagnetic system fuel injection apparatus

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Yokohama, Japan

Hiromasa Kubo