摘要:
The invention provides an electromagnetic fuel injection valve comprising a movable member having a valve element adapted to come into contact with a valve seat at a tip end thereof; an anchor arranged for relative movement with respect to the movable member in a reciprocating direction; a stationary core and a yoke to form a magnetic circuit with the anchor; a coil to generate a magnetic flux in the magnetic circuit by being energized; a first spring for urging the movable member in a valve closing direction; and a second spring for urging the anchor in a valve opening direction with an urging force smaller than that of the first spring; wherein the electromagnetic fuel injection valve further comprises a metallic cylindrical-shaped vessel including a large diameter portion and a small diameter portion which is formed integrally with the large diameter portion with same material, and the coil and the yoke are arranged on an outer circumference surface of the large diameter portion and the stationary core is arranged on an inner circumference surface of the large diameter portion, a spring seat member to constitute a spring seat for the second spring is arranged on an inner circumference surface of the metallic cylindrical-shaped vessel located on a side of the small diameter portion with respect to the stationary core and the second spring and the anchor are accommodated within a space of the metallic cylindrical-shaped vessel partitioned by the spring seat member and the anchor.
摘要:
In a center injection type of direct engine, since it has an ignition plug (20) and an injector (10) arranged in proximity, there occurs the problem that a sprayed liquid fuel directly strikes the ignition plug (20) and causes the plug (20) 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 (10) is disposed so that the coarse-grained portion is directed towards the ignition plug (20). It is possible to avoid the misfiring of the ignition plug (20) and thus prolong the life of the plug (20), by preventing a liquid fuel from directly striking the plug (20).
摘要:
The invention relates to a method that enables the inclination of the injection direction and the distribution of the penetration force of spray to be adjusted over a wide range, and an axially symmetrical spray shape to be obtained even when the injection hole is inclined, or the shape of the spray to be changed without inclining the injection hole. To provide a fuel passageway 203 as a swirling force adjustment means between the valve seat 201 and injection hole 101 of the fuel injector. This swirling force adjustment means adjusts the distribution of the swirling force of the fuel flowing into injection hole 101, and thus adjusts the spray shape obtained as a result.
摘要:
A fuel-injection valve (100) includes a fuel-injection hole (2), a valve element (4) and a valve seat (3) for opening and closing the fuel-injection hole, a force-applying member (12) for applying force to the valve element in a direction of motion of the valve element, and a drive unit (5, 10, 14, 15) for applying force to the valve element (4) in the direction opposite to that of the force applied by the force-applying member; wherein a secondary oscillation system (13, 17), which interacts with a primary oscillation system (14, 12) including the valve element (4) and the force-applying member (12), is added to the primary oscillation system, and the phase angle of force applied to the primary oscillation system by the secondary oscillation system is also staggered from that of force applied to the primary oscillation system, which is other than the force applied to the primary oscillation system by the secondary oscillation system,; whereby the bouncing of the valve element during opening and closing of the valve is reduced, which in turn makes it possible to achieve very accurate fuel-injection control.
摘要:
A fuel pressure control apparatus for cylinder injection engine having a fuel injection valve (508) for injecting fuel into a cylinder of an engine, a pipe (542) for conducting the fuel to the fuel injection valve, a fuel pump (511) for supplying the fuel from a fuel supply system to the pipe, a fuel pressure regulator (513) for regulating the fuel pressure within the pipe by discharging the fuel from the pipe to the fuel supply system, and a control unit (515) for making feed-back control on the fuel pressure within the pipe by applying a control signal determined on the basis of an engine operation parameter to the fuel pressure regulator, wherein the fuel pressure regulator is controlled in a feed-forward manner by a predetermined control value so as to make better fuel pressure control at the time of start and when the fuel pressure transiently changes.