摘要:
A method for limiting the maximum allowable operating pressure at a cam-driven injection component, which component is actuatable by a magnet valve assembly. After assembly a magnet valve it is operated at a pressure source in the context of a function test, and at least one operating parameter defining a critical operating state is ascertained at which the valve just barely opens in response to a hydraulic force F3. The operating parameter ascertained is delivered to the respective magnet valve assembly and is written into a function control unit for individual triggering of each magnet valve assembly with its own operating parameter.
摘要:
A magnet system having a magnet coil surrounded by a magnet pot is provided, the magnet coil being electrically connected to contact prongs, an interspace being formed between the outside of the magnet coil and the inside of the magnet pot, in which interspace a free-flowing compound is cast. The magnet coil is surrounded by a thin-walled coil insulating frame on which tubular contact guide elements are integrally molded. The thin-walled coil insulating frame is made of a thermally stable plastic material mixed with mineral fillers.
摘要:
A fuel injection pump of the distributor type which has at least one pump piston driven in a reciprocating stroke motion, a rotating distributor shaft which via a distributor bore upon rotation establishes a communication between the pump work chamber, defined by the pump piston, and an injection nozzle, and a switching valve for metering the fuel injection quantity. To achieve highly stable hydraulics upon opening and closing of the switching valve, a low-pressure piston is connected to the valve member of the switching valve; the low-pressure piston is axially displaceably guided on the low-pressure side of the switching valve, downstream of the outlet of a relief bore, in a wall segment. Preferably, the outer diameter of the low-pressure piston is made to largely approximate the diameter of the seat face of the valve member on the associated valve seat.
摘要:
A fuel injection pump for internal combustion engines which has a moving part supported in a housing bore and on its jacket face on one side, has an exit opening that is under high pressure, and whose bearing is improved by virtue of the fact that at least one closed annular groove is provided on the jacket face of the part or in the wall of the housing bore, axially adjacent to the exit opening. As a result, a more even pressure distribution of the pressure field prevailing in the regions of the exit opening is achieved on the circumference of the moving part and as a result, a less damage prone, improved bearing with great high pressure tightness of the moving part is provided.
摘要:
The invention relates to an electronic circuit arrangement for triggering excitation windings of electromagnetic components, provided with supplementary circuit elements, in particular free-running circuit elements, preferably solenoid valves (MV.sub.1 to MV.sub.n), whereby in order to provide a flexible open-loop control, the components are each connected in series to a controllable contact element (3). To reduce the degree of complexity of the circuit, the manufacturing price and the space requirement, it is proposed that the connecting terminals (1, 4) of this series connection lead directly, and the connections (2) between the components (MV.sub.1 to MV.sub.n) and the contact elements (3) lead via diodes (D.sub.1 to D.sub.n), respectively, to a collecting point (A, B, C), to which collecting points (A, B, C) is linked one and the same supplementary circuit-element configuration (T.sub.F,C.sub.L,10,11) shared by all components. Accordingly, the component parts of the supplementary circuit elements are subject to multiple use; they are available to all of the electromagnetic components.
摘要:
A method and apparatus for controlling the flow of fuel for a gasoline or diesel gasoline engine controls a solenoid valve for actuating the fuel pump. A pump piston is driven by the camshaft and, in turn, pressurizes the fuel for delivery to the individual cylinders. Based on the operation of the solenoid valve, the beginning of the injection of fuel and the end of the injection of fuel are established Based upon spaced angular markings on the camshaft, a control unit determines the trigger signals for actuating the solenoid valve. To calculate the trigger signals, the markings on the camshaft are counted and interpolated therebetween over time. The interpolation is based on the instantaneous rotational speed N of the camshaft, which is sensed immediately before performing the interpolation.
摘要:
In a method for operating a magnetic switching element, at least one connection of at least one sensor device is connected to at least one connection of a coil of the magnetic switching element, and at least one measuring state is established in which the at least one connection of the coil is largely at least temporarily decoupled from a ground, a voltage source, and/or a current source activating the coil, and at least one auxiliary voltage and/or at least one auxiliary current is/are applied to the at least one connection of the coil in the measuring state, and at least one sensor signal is ascertained from at least one electrical potential, at least one potential difference, and/or at least one current flowing at the connections of the coil.
摘要:
The invention relates to a control chamber, the pressure of which determines the strokes or positions of a nozzle needle, and which is assigned to a force or pressure sensor in order to detect the progression of the control chamber pressure. Because the control chamber pressure significantly changes during the closing of the nozzle needle, the operating phases of the injector can be exactly determined from the sensor data and supplied to an engine controller.
摘要:
The invention relates to an injection device (2), in particular for injecting fluid into an exhaust tract of an internal combustion engine, having a valve unit which comprises a valve needle (6), an injection chamber (38) having at least one injection opening (8), and a control chamber (36), wherein the injection device (2) is designed so that a pressure differential between the injection chamber (38) and the control chamber (36) brings about a displacement of the valve needle (6) between an open position in which the valve needle (6) releases a fluid flow (through the injection opening (8), and a closed position in which the valve needle (6) closes off the injection opening (8). The injection device (2) also has a pump unit integrated in the injection device (2). The pump unit is designed so as to draw in fluid from the fluid inlet (32) during operation and to provide said fluid to the valve unit under increased pressure.
摘要:
Disclosed is a valve comprising a valve member (72) that is guided so as to be movable in the direction of the longitudinal axis (73) thereof, extends into a valve pressure chamber (77), and is provided with a sealing surface (81) on a face which runs perpendicular to the longitudinal axis (73) thereof inside the valve pressure chamber (77). Said sealing surface (81) of the valve member (72) cooperates with a valve seat (79) that runs perpendicular to the longitudinal axis (73) thereof so as to at least largely close an opening (78) which is surrounded by the valve seat (79) relative to the valve pressure chamber (77). A connection (64) to a low-pressure area lies immediately next to said opening (78). The inventive valve member (72) is also provided with a peg (83) which extends into the connection (64) and by means of which liquid that flows out of the valve pressure chamber (77) when the sealing surface (81) of the valve member (72) is lifted from the valve seat (79) is directed in such a way that said liquid applies at least nearly no resulting force onto the valve member (72) in the direction of the longitudinal axis (73) thereof.