A fuel injection device is used in an internal combustion engine having a combustion chamber partitioned by a cylinder head, a cylinder, and a piston crown surface so that at least one of the amount of NOx, Pmax, and a thermal efficiency is maintained at a predetermined value. The fuel injection device includes a fuel injection change unit. The fuel injection change unit virtually divides the combustion chamber into N number of combustion zones where N is a natural number of 2 or more, and can change a fuel injection method according to the respective combustion zones. The fuel injection change unit divides the combustion chamber into the N number of combustion zones, thereby being capable of eliminating a difference of heat in the respective combustion zones, and precisely controlling an in-cylinder pressure P in the combustion chamber. As a result, the amount of NOx and the thermal efficiency can be optimized. Therefore, both of a reduction in the amount of NOx and the high thermal efficiency can be achieved.

This disclosure describes various implementations of a downhole-blower system that can be used to boost production in a wellbore. The downhole-blower system includes a blower and an electric machine coupled to the blower that can be deployed in a wellbore, and that can, in cooperation, increase production through the wellbore.

A throttle portion is defined between an upper end of a sac chamber and a conical portion of a needle to have a throttle opening area S1. Half of an area surrounded by the throttle portion, the needle, an inner wall of the sac chamber, and a lower end extended line in a cross section of the sac chamber taken along a sac center line is an injection hole upstream area S2. A lift amount, when the throttle opening area S1 is equal to an area which is calculated by multiplying an injection hole area S3 by the number of the injection holes, is a predetermined lift amount L. A viscosity coefficient of fuel is . An index value Sa, which is calculated in accordance with an equation as below, is set to 0.5 or greater.

[00001]$S_a=\frac{}{2}.Math.{}_{h=0}^{h=L}.Math.{\left(\frac{S_1}{S_2-S_1}\right)}^2.Math..Math.\mathrm{dh}$

A centrifugal conical-spray atomization device. A head portion of a needle valve is provided with a throttling guidance cone. A seat surface of the needle valve mates with seat surface of a spin chamber to open and close a spray hole in a pulsatory manner. A plurality of tangential holes are provided between a pressure chamber and a spin chamber. After being spun tangentially by the spin chamber, fuel is sprayed from a spray opening with a tangential force, forming a hollow umbrella-like fuel film without a compact fuel spray core. The umbrella-like fuel film has a controllable penetration distance and spins at a high speed in a combustion chamber. The centrifugal conical-spray atomization device not only exhibits a wide adjustable range of fuel flow, but is able to automatically open and close the spray hole, while carbon deposition would not easily form to block the spray hole.

Provided is a fuel injection control device capable of improving detection accuracy of a singular point with respect to a characteristic of the fuel injection valve to be equal to or higher than an original time resolution of the A/D conversion, and capable of accurately detecting the singular point. A variable control part 24 variably controls a conversion timing of the A/D conversion part 221 such that the conversion timing of A/D conversion for physical quantity data related to driving of the fuel injection valve 10 is relatively changed, the A/D conversion part 221 acquires a plurality of time series data by performing A/D conversion on the physical quantity data at a conversion timing before change and at a conversion timing after change by the variable control part 24, and a detection part 223 detects a singular point with respect to the characteristic of the fuel injection valve 10 based on the plurality of time series data.

The present disclosure provides a fuel injector for an internal combustion engine with a fuel injector body having a valve chamber, a first conduit in fluid communication with the valve chamber for a first flow of fuel having a first pressure, and a second conduit in fluid communication with the valve chamber for a second flow of fuel having a second pressure. The fuel injector further includes a valve member configured to move between the first conduit and the second conduit. Additionally, an actuator of the fuel injector is configured to move the valve member during a fuel injection cycle. The fuel injector is configured to operate in at least three modes.

The present disclosure provides a fuel injector for an internal combustion engine with a fuel injector body having a valve chamber, a first conduit in fluid communication with the valve chamber for a first flow of fuel having a first pressure, and a second conduit in fluid communication with the valve chamber for a second flow of fuel having a second pressure. The fuel injector further includes a valve member configured to move between the first conduit and the second conduit. Additionally, an actuator of the fuel injector is configured to move the valve member during a fuel injection cycle. The fuel injector is configured to operate in at least three modes.

A fuel injector 100 includes a nozzle member 60 having a fuel passage 60a leading to an injection port 60b; a valve main body 51 adapted to reciprocate for opening and closing the fuel passage 60a; an elastic portion 56 elastically deformable in closing the fuel passage 60a by movement of the valve main body 51 in a closing direction, the elastic member being attached to one of the nozzle member 60 and the valve main body 51 and adapted to be abutted against the other of the nozzle member 60 and the valve main body 51 to close the fuel passage 60a by moving the valve main body 51 in the closing direction; and a stopper 70 adapted to restrict movement of the valve main body 51 in the closing direction by being abutted against the valve main body 51, the stopper 70 being formed of material different from the nozzle member 60.

A fuel injector is provided and may include an injector body and an injector valve. The injector body may define a longitudinally extending chamber and may include a first intake port, a second intake port and a fuel injection port. The injector valve may be disposed within the chamber and may include a longitudinally extending aperture in fluid communication with the longitudinally extending chamber. The injector valve may be configured to prevent fluid communication between the first intake port and the second intake port, and may be configured to prevent fluid communication between the fuel injection port and the second intake port.

Methods and systems are provided for moving an injector needle of a fuel injector assembly from a first position to a second position to provide a first fuel injection at the first position, and moving the needle from the second position to the third position to provide a second fuel injection at the third position, and moving the needle back to the first position via the second position, and providing a third fuel injection at the second position. In this way, three fuel injections may be performed during a single actuation cycle of the injector during a single combustion cycle.