摘要:
A method of controlling a fuel injection device that can control a small amount of injection is provided. A fuel injection device for use in an internal combustion engine, includes: a valve body that can open and close a fuel passage, a needle that transfers a force with the valve body, and executes valve opening/closing operation, and an electromagnet that includes a coil and a magnetic core provided as a driver for driving the needle, and a cylindrical nozzle holder disposed on an outer periphery of the magnetic core and the needle, in which a current is supplied to the coil to exert a magnetic attractive force between the magnetic core and the needle to open the valve body.
摘要:
A drive circuit for driving an electromagnetic fuel-injection valve, the drive circuit varying an application sequence of a drive voltage, which is supplied from a step-up power supply to a fuel-injection valve for conducting injection multiple times in a single stroke of an internal-combustion engine, between the first injection and the second and subsequent injections, and setting the application sequence such that the consumption of power from the step-up power supply in the first injection becomes smaller than the power consumption in one of the second and subsequent injections.
摘要:
In a spray characteristic in a direct injection system gasoline engine use electromagnetic system fuel injector, to a piston cavity a mixture of fuel and air having a combustible concentration is converged and making rich the mixture having the combustible concentration at a side of ignition plug, then an ignition performance is improved and making thin the mixture of fuel and air to a piston direction a combustion performance is improved, namely it is necessary to generate a flat inclined spray. A part of a wall face for forming the injection hole at an outlet portion of the injector is formed with V groove according to two inclination faces with optional angles against a center axial line of the injection hole or a substantially recess shape step-wise rectangular groove having different cut-off depths.
摘要:
Novel 5'-deoxy-cytidine derivatives represented by the general formula (I) ##STR1## wherein R.sup.1 is a hydrogen atom or a group easily hydrolyzable under physiological conditions; R.sup.2 is a hydrogen atom, or --CO--OR.sup.4 group [wherein R.sup.4 is a saturated or unsaturated, straight or branched hydrocarbon group consisting of one to fifteen carbon atoms, or a group of the formula --(CH.sub.2).sub.n --Y (in which Y is cyclohexyl or phenyl; n is an integer from 0 to 4)]; R.sup.3 is a hydrogen atom, bromo, iodo, cyano, a C.sub.1-4 alkyl group [which may be substituted with halogen atom(s)], a vinyl or ethynyl group [which may be substituted with halogen atom(s), C.sub.1-4 alkyl, cycloalkyl, aralkyl, or aromatic ring which may have one or more hetero atom(s)], or an aralkyl group which may be substituted for use in medical therapy, especially tumor therapy.
摘要:
A TIG welding method is usually carried out in a manner that a tungsten electrode is inserted into a weld groove portion of a member to be welded, an electric voltage is applied to a current conducting portion provided for the tungsten electrode while flowing a shield gas means to thereby generate an arc between the tungsten electrode and the member to be welded to form a molten pool of the member, a welding wire is inserted into the molten pool, and a welding torch is then operated to perform a welding process. In the improvement of the TIG welding method, the shield gas means is composed of an inner shield gas flowing from a periphery of the tungsten electrode to a front end thereof inserted into the weld groove portion of the member to be welded and an outer shield gas flowing towards the weld groove angle from an outside of the inner shield gas to prevent the molten pool from being oxidized and to prevent oxygen in air from being involved. The TIG welding torch for carrying out the method is specifically provided with the inner and outer shield gas flow means, and further provided with a central shield gas flow means.
摘要:
A fuel injection control apparatus is capable of reducing a minimum quantity of fuel injection without reducing a maximum quantity of injection. To open a fuel injector valve, a driving circuit supplies an electric current from a high-voltage power supply to the fuel injector. Then, after valve opening, the high-voltage power supply is switched to a low-voltage power supply, and an open state of the valve is retained. For opening the valve of the fuel injector, a microcomputer, after supplying current from the high-voltage power supply to the injector, discharges the current rapidly for a decrease below a first current level at which the open state of the valve cannot be retained. The microcomputer then controls the supply current to the injector so as to supply a current at a second current level at which the open state of the valve can be retained.
摘要:
In a center injection type of direct injection engine, since it has an ignition plug and an injector arranged in proximity, there occurs the problem that a sprayed liquid fuel directly strikes the ignition plug and causes the plug to misfire. A notch is to be provided at a portion of the injector end so as to form a coarse-grained portion and a dense portion in sprays of fuel, and the injector is disposed so that the coarse-grained portion is directed towards the ignition plug. It is possible to avoid the misfiring of the ignition plug and thus prolong the life of the plug, by preventing a liquid fuel from directly striking the plug.
摘要:
A valve structure which works easily, does not increase production cost, can reduce dispersion in a side gap by restricting eccentricity and incline of a valve body and can maintain highly accurate injection. An electromagnetic fuel injection valve is required which is easy to manufacture even in a narrow valve structure. A guide portion is provided having one end fixed to an injection valve main body for guiding the valve member. A nozzle guide body constituting a magnetic passage portion to surround a magnetic member connected and fixed to one end of the valve member by the same material is provided. Accordingly, it is possible to reduce dispersion of a side gap constituting the magnetic passage, and it is also possible to stabilize an axial motion of the valve member, whereby high injection accuracy is maintained and an inexpensive injection valve is obtained.
摘要:
Novel 5′-deoxy-cytidine derivatives represented by the general formula (I) wherein R1 is a hydrogen atom or a group easily hydrolyzable under physiological conditions; R2 is a hydrogen atom, or —CO—OR4 group [wherein R4 is a saturated or unsaturated, straight or branched hydrocarbon group consisting of one to fifteen carbon atoms, or a group of the formula —(CH2)n—Y (in which Y is cyclohexyl or phenyl; n is an integer from 0 to 4)]; R3 is a hydrogen atom, bromo, iodo, cyano, a C1-4 alkyl group [which may be substituted with halogen atom(s)], a vinyl or ethynyl group [which may be substituted with halogen atom(s), C1-4 alkyl, cycloalkyl, aralkyl, or aromatic ring which may have one or more hetero atom(s)], or an aralkyl group which may be substituted for use in medical therapy, especially tumor therapy.
摘要:
An electromagnetic fuel injection valve comprises a valve body, a valve seat which cooperates with the valve body, a fuel injection port disposed downstream of the valve seat, and a dividing device which serves to divide injection fuel injected from the fuel injection port. The dividing device is formed integrally with a member in which the fuel injection port is formed and includes parallel walls substantially parallel to each other with the fuel injection port interposed therebetween and arcuate walls connected to the parallel walls having a diameter larger than that of the fuel injection port. The walls extend from said member in a direction of an axis of the valve. The dividing device has an outer diameter substantially equal to the largest diameter of the valve seat.