Patent•
Pump-nozzle unit for supplying fuel to a combustion chamber of a direct-injection control valve
10 Feb 2000-
TL;DR: In this article, an independent claim is included for a method of controlling the buildup of pressure in a pump unit using a hydraulic translation arrangement, which converts downward movement of an actuator into upward movement of a valve with a selectable transmission ratio.
Abstract: The unit has a pump unit (2) for building up an injection pressure and for injecting the fuel by way of an injection nozzle (3) into the combustion chamber. A control unit (4) has a control valve (5) formed as an A-valve which opens outwards, with a valve actuating unit (6) controlling the buildup of pressure in the pump unit being formed from a piezoelectric actuator. The valve and piezo actuator may be connected by a hydraulic translation arrangement (14) which converts downward movement of the actuator into upward movement of the valve with a selectable transmission ratio. The hydraulic translation arrangement also acts as a thermal compensating element between the different materials of the actuator and the valve. An Independent claim is included for a method of controlling the buildup of pressure in a pump unit.
Citations
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Patent•
11 Jul 2002TL;DR: In this paper, the damping path is embodied such and connected in such a way to the filling path that the fuel positively displaced from a damping chamber via damping throttle in an injection event reaches the fillingpath of the pressure booster pressure chamber via the damped path.
Abstract: A fuel injection system for an internal combustion engine including a fuel injector which can be subjected to fuel at high pressure and is actuatable via a metering valve device by which the pressure in a pressure booster control chamber is controllable such that the pressure in a pressure booster pressure chamber, defined by a pressure booster piston, that can be filled with fuel from the high-pressure fuel source via a filling path in which a check valve is disposed and that is in communication with an injection valve member pressure chamber, is increased by the pressure booster piston such that an injection valve member opens for injecting fuel, whereupon fuel is positively displaced out of a damping chamber via a damping path, in which a damping throttle is disposed. To assure stable injection performance, the damping path is embodied such and connected in such a way to the filling path that the fuel positively displaced from the damping chamber via the damping throttle in an injection event reaches the filling path of the pressure booster pressure chamber via the damping path.
291 citations
Patent•
14 Aug 2001TL;DR: In this article, the bestandteil eines Kraftstoffeinspritzventils is vorgesehen, in which a Hydraulikammer is ausgebildet, wenigstens eine hydraulikleitung (23) with einer gegenuber dem piezoelektrischen Aktor (3) abgedichteten Bohrung (5) des Ventilglieds (2) verbunden ist, wobei die Hydraulikkammer al
Abstract: Ein Ventil zum Steuern von Flussigkeiten ist mit einem piezoelektrischen Aktor (3) zur Betatigung eines Ventilglieds (2), das an einem Ende einen ein Ventilschliesglied bildenden Ventilkopf (7) aufweist, der mit einem an einem Ventilkorper (6) vorgesehenen Sitz (8) zum Offnen und Schliesen des Ventils (1) zusammenwirkt, ausgebildet. Auf einer dem Ventilglied (2) abgewandten Seite des piezoelektrischen Aktors (3) ist eine Hydraulikkammer (21) vorgesehen, die uber wenigstens eine Hydraulikleitung (23) mit einer gegenuber dem piezoelektrischen Aktor (3) abgedichteten Bohrung (5) des Ventilglieds (2) verbunden ist und in die ein mit dem piezoelektrischen Aktor (3) verbundener Kolben (20) eintauchbar ist, wobei die Hydraulikkammer (21) als hydraulische Feder ausgebildet ist, welche mit ihrer Federkraft auf den mit dem piezoelektrischen Aktor (3) verbundenen Kolben (20) das Vorspannelement und das Toleranzausgleichselement darstellt. Das Ventil ist insbesondere als Bestandteil eines Kraftstoffeinspritzventils vorgesehen.
127 citations
Patent•
01 Feb 2002
TL;DR: In this article, a valve for controlling liquids, comprising an especially piezoelectric actuator unit for actuating a valve element, arranged in a valve body consisting of at least one part.
Abstract: The invention relates to a valve for controlling liquids, comprising an especially piezoelectric actuator unit for actuating a valve element (10) which is arranged in a valve body (22) consisting of at least one part. Said valve element comprises at least one adjusting piston (11) connected to the actuator unit, and at least one actuating piston (13) which interacts with the adjusting piston (11) by means of a hydraulic coupler (12). Said actuating piston is connected to a valve closing element (14) which co-operates with at least one valve seat (15) and which, in the closed state, separates a control chamber (19) from a discharge chamber (20). The hydraulic coupler (12) is provided with a filling device. Said valve closing element (14) comprises a cylindrical region (17; 41; 51) which is embodied in the form of a piston, and which forms, with the valve body (22), at least one filtering gap for the liquid to be supplied to the filling device, at the height of which a supply channel (26) branches off from the filling device.
39 citations
Patent•
26 Mar 2003
TL;DR: In this paper, the authors detect the moment of impact of the valve needle (48) pertaining to a piezo control valve (22) of a pump-nozzle unit, when the valve is closed and/or opened.
Abstract: The aim of the invention is to be able to detect the moment of impact of the valve needle (48) pertaining to a piezo control valve (22) of a pump-nozzle unit, when the piezo control valve (22) is closed and/or opened. To this end, the piezo voltage (u(t)) and/or piezo current (i(t)) are evaluated. Said evaluation can especially involve the identification of discontinuities and/or pulses during the course of the piezo voltage (u(t)) and/or the piezo current (i(t)). The detected moment of impact can advantageously be put in temporal relation with a known auxiliary variable (SOI, EOI), especially for regulation purposes.
37 citations
Patent•
23 Aug 2002TL;DR: In this article, a high-pressure pump and a fuel-supply pump that delivers fuel from a fuel tank to the high pressure pump are presented. But the pump working chamber is not connected to the internal chamber.
Abstract: A fuel injection apparatus has a high-pressure pump and a fuel-supply pump that delivers fuel from a fuel tank to the high-pressure pump. The high-pressure pump has a housing with an internal chamber that contains a drive unit for at least one pump element having a pump piston driven by the drive unit and delimiting a pump working chamber into which fuel is supplied via an inlet during an intake stroke and from which fuel is displaced via an outlet into the reservoir during a delivery stroke of the pump piston. The fuel-supply pump delivers fuel into the internal chamber via a connection that contains a check valve which opens toward the internal chamber of the housing and the inlet of the pump working chamber is connected to the internal chamber.
36 citations
References
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Patent•
14 Aug 2001TL;DR: In this article, the bestandteil eines Kraftstoffeinspritzventils is vorgesehen, in which a Hydraulikammer is ausgebildet, wenigstens eine hydraulikleitung (23) with einer gegenuber dem piezoelektrischen Aktor (3) abgedichteten Bohrung (5) des Ventilglieds (2) verbunden ist, wobei die Hydraulikkammer al
Abstract: Ein Ventil zum Steuern von Flussigkeiten ist mit einem piezoelektrischen Aktor (3) zur Betatigung eines Ventilglieds (2), das an einem Ende einen ein Ventilschliesglied bildenden Ventilkopf (7) aufweist, der mit einem an einem Ventilkorper (6) vorgesehenen Sitz (8) zum Offnen und Schliesen des Ventils (1) zusammenwirkt, ausgebildet. Auf einer dem Ventilglied (2) abgewandten Seite des piezoelektrischen Aktors (3) ist eine Hydraulikkammer (21) vorgesehen, die uber wenigstens eine Hydraulikleitung (23) mit einer gegenuber dem piezoelektrischen Aktor (3) abgedichteten Bohrung (5) des Ventilglieds (2) verbunden ist und in die ein mit dem piezoelektrischen Aktor (3) verbundener Kolben (20) eintauchbar ist, wobei die Hydraulikkammer (21) als hydraulische Feder ausgebildet ist, welche mit ihrer Federkraft auf den mit dem piezoelektrischen Aktor (3) verbundenen Kolben (20) das Vorspannelement und das Toleranzausgleichselement darstellt. Das Ventil ist insbesondere als Bestandteil eines Kraftstoffeinspritzventils vorgesehen.
127 citations
Patent•
12 Dec 1987TL;DR: In this paper, a piezocontrol valve for controlling fuel injection by means of an injection valve is described, which consists of a piezoactuator which is arranged in a housing and a valve.
Abstract: A piezocontrol valve, in particular for controlling fuel injection by means of an injection valve is described, which consists of a piezoactuator which is arranged in a housing and a valve. By means of a hydraulic play compensating element within the control valve, on the one hand, possible changes in length of the reference system are automatically compensated as a result of piezoceramic creep processes in the piezoactuator so that with the same working stroke of the piezoactuator an identical stroke at the valve is also always ensured. In addition, by means of hydraulic stroke transmission within the control valve, on the other hand, a valve stroke which corresponds to a multiple of the working stroke is achieved.
17 citations
Patent•
30 May 1995TL;DR: In this paper, the needle valve is spring loaded into the closed position and a damping, piston is used on the needle shaft to ensure a smooth operation of the valve, and a piezoelectric element in the system alters the hydraulic pressure and varies the size of the gas pivot.
Abstract: The valve needle (4) of the injector has its shaft moving via seal (21) into a hydraulic chamber separated from the fuel system. A piston (6) on the valve stem separates the hydraulic fluid from a gas pocket. A piezoelectric element (8) in the system alters the hydraulic pressure and varies the size of the gas pivot to move the needle valve. The needle valve is spring loaded (15) into the closed position. The piezo-electric element presses on a piston (9) sealed inside the main chamber on sliding seals. A damping, piston (49) on the needle shaft ensures a smooth operation of the valve.
5 citations