摘要:
A process for performing energy conversion that converts pressurized combustants to produce to expansive work in one or more devices selected from the group including a reversible fuel cell, expansion engine, and heat releasing combustor.
摘要:
A fuel injection valve for a fuel injection system of an internal combustion engine, in particular for injecting fuel directly into the combustion chamber of the internal combustion engine. The fuel injection valve has a magnet coil, an armature that can be pulled by the magnet coil in a direction of lift against a first return spring, and a valve needle. The valve needle has a first stop surface for the armature, which can be moved relative to the valve needle. The armature is acted upon by a second return spring. In addition, a stationary second stop surface for the armature is provided. The second return spring acts upon the armature in a direction opposite to the lift and in an inoperative position, when the magnet coil is not energized, and holds the armature in contact with the second stop surface so that a distance between the armature and the first stop surface provided on the valve needle is predefined.
摘要:
A method is described for operating a fuel injector for fuel injection systems of internal combustion engines, particularly for the direct injection of fuel into a combustion chamber of an internal combustion engine. The fuel injector has a magnetic coil, an armature acted upon in a closing direction by a resetting spring, and a valve needle, frictionally connected to the armature, for actuating a valve-closure member which, together with a valve-seat surface, forms a sealing seat. The method includes exciting the magnetic coil with a basic current intensity during an opening phase of the fuel injector, shortly before the end of the opening phase, exciting the magnetic coil with a current pulse that is increased compared to the basic current intensity, and, at the end of the opening phase, switching off the current exciting the magnetic coil.
摘要:
A fuel injection valve, in particular an injection valve for fuel injection systems of internal combustion engines, has a valve closing body that can be activated by an activation device with the aid of a valve needle, the valve closing body interacting with a valve seat surface to produce a sealing seat, and the activation device having at least one piezoelectric first bending element for producing a valve needle lift of the valve needle, the first bending element bending when the activation device is activated. In this context, the bending element is made of a plurality of piezo elements stacked in a longitudinal direction of the first bending element, internal electrodes arranged between the piezo elements being oriented perpendicular to the longitudinal direction of the bending element.
摘要:
A gas valve with electromagnetic actuation, in particular a fuel-injection valve for gas engines, is provided with a sealing member which is actuable by way of the armature of a controllable electromagnet between the or each fuel supply and the or each fuel outlet and with at least one closure spring acting upon the sealing member. In order to provide a gas valve which has—at the same time—a large throughflow cross-section, exact operating and response times as short as possible and a low power consumption and which is also suitable for use in multi-point or ported-gas admission systems and in the case of supercharged engines, in particular in the case of gas engines for commercial vehicles or stationary gas engines, at least one device for compensating the differential pressure acting upon the sealing member is connected to the sealing member.
摘要:
A compensating element is disposed between a piezoelectric actuator and one or more transmission elements. The compensating element has a curved surface that bears against the piezoelectric actuator. The compensating element compensates for both a tilting of the piezoelectric actuator and, if two transmission elements are provided, for a difference in an overall height of the transmission elements.
摘要:
An electromagnetic fuel injector of an internal combustion engine having a plurality of electromagnetic coils for valve driving wound separately on a bobbin in an axial direction. The bobbin has a step difference of the outer diameter so that the bobbin outer diameter in the region with the second coil to be wound thereon is smaller then the bobbin outer diameter in the region with the first coil to be wound thereon, and the bobbin inner diameter has a step difference in that the bobbin inner diameter in the region with the first coil to be wound thereon is made large partially so as to secure an annular space to interpose a seal ring therein.
摘要:
A fuel injection valve includes, in part, a pipe, a fixed connector (fixed core), a movable core, a solenoid coil and a needle valve. In the fuel injection valve, a diameter of a fixed action surface of the fixed connector is made smaller than a movable action surface of the movable core. Therefore, magnetic flux around an outer circumferential portion is transmitted from the fixed action surface to the movable action surface substantially in a direction perpendicular to the movable action surface. Thus, an electromagnetic force acting therebetween is efficiently transformed to an attracting force for the movable core.
摘要:
An ECU calculates a command injection amount based on a driving condition, and calculates an injection timing based on a detected fuel pressure. Further, the ECU calculates a provisional injection period, and calculates again an injection period based on the injection timing fuel pressure and the command injection amount when the injection timing fuel pressure is correctly detected.
摘要:
An electromagnetically actuated valve is provided having that an axially movable valve needle, which is formed by an armature, a valve closing body and a connection piece connecting the two. The tubular connection piece has two elongated slots, which do not extend over the entire length of the connection piece, but at least over 75% of its length. Thus there are two spring-elastic half-shells in the slotted area. The valve closing body is attached at the unslotted end of the connection piece. The valve is particularly well suited for use in fuel injection systems of compressed-mixture, externally ignited internal combustion engines.