Abstract:
Disclosed is a fuel injection device for internal combustion engines. Said device supplies fuel from a high pressure fuel source (1) to fuel injection valves (9) controlled by a control device (10). The fuel injection device has an injection valve member (12) that is impinged upon by the supplied high pressure fuel via an exposed annular area (14) and that can be opened for effecting injection. The fuel is supplied by means of a pressure line (10a, 10b). The passage of fuel is controlled by a control valve (20) whose control valve is movable in a valve chamber (24) between two valve seats (30, 31) and which controls the connection between the high pressure fuel source (1) and the fuel injection valve (9) for effecting a preinjection and a main injection.
Abstract:
An injector is designed to provide continuously variable injection rate shaping. With a hydro-mechanical internal feedback mechanism, injector needle position can be determined by controlling a feedback valve's on/off timing. According to the needle position, an injection needle valve opening can be controlled, and then the injection flow rate can be delivered proportionally. Also in accordance with the present invention a CRDI systems are provided including injectors of the present invention, wherein results demonstrate that injector designs of the present invention not only achieve rate shaping capability but also solve the above-noted problems of the current CRDI system. Finally, an iterative learning controller has also been developed to track the desired injection rate, and an injection rate estimator is designed to realize a cycle to cycle feedback control.
Abstract:
A method for controlling injection rate and injection pressure of an electromagnetic fuel injector assembly having a pressure balanced control valve including a solenoid and a valve member subject to the pressure developed by the injector and actuated by the solenoid to close the valve member against the biasing force of a spring. The control valve is supported in a valve bore in an injector body. The method includes the step of providing a first level of current to the solenoid for moving the valve member from an open to a closed position allowing the pressure in the injector to rise, providing a regulated current to the solenoid at preselected times during the injector event to unbalance the forces acting on the valve member thereby slightly unseating the valve member to regulate injection pressure and injection rate of the fuel injector, and ending solenoid current delivery thereby moving the valve member to its open position.
Abstract:
A storage type fuel injection device which comprises a needle valve (6) for closing an injection nozzle (11) having a nozzle hole (14) formed at a leading end thereof, a balance chamber (5) formed in casing (2) so as to impart a fuel pressure to a head portion of the needle valve (6), a supply path including a slit (10) for supplying fuel from a fuel supply port (19) to the balance chamber (5), a discharge path (20) which is an orifice for discharging fuel from the balance chamber (5), and a solenoid valve (22) for opening and closing the discharge path (20), wherein the lift of a valve disc (26) of the solenoid valve (22) is controlled by a lift control means comprising a stopper (28) the position of which is controlled by a lift control mechanism (23), wherein the open area of the discharge path (20) which is an orifice is increased and/or decreased in accordance with the lift of the valve disc (26), and wherein the lift of the needle valve (6) is set in such a manner that the open area of the slit (10) facing the balance chamber (5) is increased and/or decreased according to the flow rate of fuel passing through the discharge path (20), whereby the opening of the injection nozzle (11) is increased and/or decreased.
Abstract:
Es wird ein Verfahren zum Betreiben eines Injektors einer Brennkraftmaschine, dessen Düsennadel von einem Piezo-Aktuator über ein Servoventil betrieben wird, beschrieben. Der Leerhub des Piezo-Aktuators wird durch Aufrechterhaltung einer permanenten Direktkraftanbindung zwischen Piezo-Aktuator und Servoventil eliminiert, so dass eine Kraftänderung auf das Servoventil durch Ventilraumdruckänderung beim Öffnen und Schließen des Servoventils und beim Schließen der Düsennadel des Injektors immer als Kraftänderung auf den Piezo-Aktuator übertragen wird. Die hierdurch bewirkte Spannungs-und/oder Kapazitätsänderung des Piezo-Aktuators wird erfasst, und hieraus werden Parameter ermittelt, mit denen die vom Injektor abgegebene Einspritzmenge geregelt wird. Auf diese Weise lässt sich eine besondere hohe Mengendosierungsgenauigkeit erreichen.
Abstract:
A method for controlling injection rate and injection pressure of an electromagnetic fuel injector assembly having a pressure balanced control valve including a solenoid and a valve member subject to the pressure developed by the injector and actuated by the solenoid to close the valve member against the biasing force of a spring. The control valve is supported in a valve bore in an injector body. The method includes the step of providing a first level of current to the solenoid for moving the valve member from an open to a closed position allowing the pressure in the injector to rise, providing a regulated current to the solenoid at preselected times during the injector event to unbalance the forces acting on the valve member thereby slightly unseating the valve member to regulate injection pressure and injection rate of the fuel injector, and ending solenoid current delivery thereby moving the valve member to its open position.
Abstract:
Die Erfindung bezieht sich auf einen Kraftstoffinjektor für direkteinspritzende Verbrennungskraftmaschinen. Der Kraftstoffinjektor umfasst einen Injektorkörper (1), der einen Steuerraum (2) enthält. Über eine Druckbeaufschlagung/Druckentlastung des Steuerraumes (2) ist eine Düsennadel-/Stössel-Anordnung (6) im Injektorkörper (1) betätigbar. Der Steuerraum (2) ist über einen Strömungskanal (10) mit einem ersten Drosselelement (13) druckentlastbar und steht über einen hochdruckseitigen, permanent wirkenden Zulauf (28) mit einem zweiten Drosselelement (26) mit einer Hochdruckquelle in Verbindung. Im Injektorkörper (1) des Kraftstoffinjektors ist ein Schaltventil (16) aufgenommen, welches über den Strömungskana1 (10) mit dem Steuerraum (2) verbunden ist. Zum Druckaufbau im Steuerraum (2) ist mittels des Schaltventiles (16) ein weiterer, hochdruckseitiger Zulauf (29) mit einem dritten Drosselelement (27) im permanent wirkenden Zulauf (28) zum Steuerraum (2) parallel schaltbar.
Abstract:
A common rail (16) single fluid fuel injection system (12) includes fuel injectors (14, 114) with a single electrical actuator (42) but the ability to produce ramp, square and split injection rate shapes. This is accomplished by including a control valve member (44) that is operably coupled to the electrical actuator and is movable between a high pressure seat (45) and a low pressure seat (46). A fuel supply passage (36) is opened to a nozzle passage by moving an admission valve member (60) from a closed position to an open position by relieving fuel pressure on a control surface (64) via movement of the control valve member (44). In addition, a needle valve member (71, 171) is movable from a closed position to an open position by relieving pressure on a closing hydraulic surface (74, 174) associated with the needle valve (70, 170), which is again accomplished via movement of the control valve member (44) via the electrical actuator (42).
Abstract:
The invention relates to a fuel injector for direct injection internal combustion engines. The fuel injector comprises an injector body (1) containing a control chamber (2).A nozzle needle/ tappet arrangement (6) in the injector body can be actuated by impinging/reducing pressure in the control chamber (2). The pressure in the control chamber (2) can be reduced via a flow channel (10), using a throttle element (13), said control chamber (2) being connected to a high pressure source by means of a permanently active pressure-side feed (28) and a second throttle element (26). A switch valve (16) is accommodated in the body (1) of the fuel injector, said valve being to connected to the control chamber (2) via the flow channel (10). In order to build up pressure in the control chamber (2), said switch valve (16) is used for parallel connection of another high-pressure side feed (29) to a third throttle element (27) in the permanently active feed (28) to the control chamber (2).
Abstract:
Die Erfindung bezieht sich auf einen Kraftstoffinjektor für Brennkraftmaschinen mit einem Injektorkörper (1), in dessen Gehäuse (2) eine Einspritzöffnungen freigebende oder diese verschliessende Düsennadel (23) bewegbar aufgenommen ist. Die Düsennadel (23) ist über einen druckentlastbaren Steuerraum (20) betätigbar, der über einen Zulauf (13) von einer Hochdruckquelle mit unter hohem Druck stehenden Kraftstoff beaufschlagt wird und im Gehäuse (2) des Injektorkörpers (1) ein Ventilraum (5) eines Mehrwegeventils (3) ausgebildet ist. Der Steuerraum (20) ist mit dem Ventilraum (5) des Mehrwegeventils (3) über einen Steuerraumkanal (16) verbunden, der in bezug auf den Steuerraum (20) sowohl in Entlastungsrichtung (17) als auch in Belastungsrichtung (18) beaufschlagbar ist.