Patents by Inventor Uwe Liskow

Uwe Liskow has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6772737
    Abstract: In a method and a circuit system for operating a solenoid valve, particularly for actuating an electrohydraulic gas-exchange valve control, an injection valve, or an intake or exhaust valve of an internal combustion engine, to permit the simplest possible driving of the solenoid valve, the solenoid valve is acted upon in a controlled manner in a cycle including three phases, in which in a pull-up phase, the solenoid valve is connected for a predefined time duration to a first voltage of predetermined magnitude for generating a pull-up current, in a holding phase is connected to a second voltage of predetermined magnitude for generating a holding current, and in a de-energize phase is separated from both voltages.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: August 10, 2004
    Assignee: Robert Bosch GmbH
    Inventors: Hermann Gaessler, Udo Diehl, Karsten Mischker, Rainer Walter, Juergen Schiemann, Christian Grosse, Volker Beuche, Stefan Reimer, Uwe Liskow
  • Publication number: 20040118951
    Abstract: A fuel injector (1) for the direct injection of fuel into a combustion chamber of an internal combustion engine includes a piezoelectric or magnetostrictive actuator (3) and a valve-closure member (11) able to be actuated by the actuator (3), the valve-closure member (11) cooperating with a valve-seat surface (12) to form a sealing seat, a compensation gap (9) being present in an actuation path between the actuator (3) and the valve-closure member (11). A measuring element (13) is provided in the actuator (3) and/or in the actuation path, the measuring element (13) measuring the forces exerted by the actuator (3) the valve-closure member (11) and the actuator (3) being regulated in such a way that the compensation gap (9) is being held closed.
    Type: Application
    Filed: January 23, 2004
    Publication date: June 24, 2004
    Inventor: Uwe Liskow
  • Publication number: 20040112992
    Abstract: A fuel injector, in particular a fuel injector for fuel-injection systems of internal combustion engines, including a piezoelectric or magnetostrictive actuator, which, via a valve needle, actuates a valve-closure member arranged on the valve needle, the valve-closure member cooperating with a valve-seat surface to form a sealing seat, the fuel injector having an hydraulic compensation chamber. A pressure piston cooperates with the compensation chamber, which is filled with hydraulic fluid via an hydraulic fluid inlet. The actuator is arranged between the pressure piston and the valve needle and displaceable in the axis of the valve needle and the pressure piston.
    Type: Application
    Filed: January 14, 2004
    Publication date: June 17, 2004
    Inventor: Uwe Liskow
  • Patent number: 6742505
    Abstract: In an internal combustion engine, the fuel reaches a combustion chamber via at least one fuel-injecting device. The fuel-injecting device includes a piezo actuator. The drive energy (U), which is necessary for a specific stroke (h) of the piezo actuator, is determined from at least one function (34 to 40) which couples the stroke (h), the drive energy (U) and the drive time (t) of the piezo actuator with each other. In order to more accurately adjust the stroke of the piezo actuator, it is suggested that a function (34 to 40) be used for the determination of the drive energy (U). These functions (34 to 40) were previously determined for a typical collective load (L1, L2) to which a piezo actuator is subjected.
    Type: Grant
    Filed: October 10, 2002
    Date of Patent: June 1, 2004
    Assignee: Robert Bosch GmbH
    Inventor: Uwe Liskow
  • Patent number: 6701899
    Abstract: A fuel injection system including at least one fuel injector having an inlet section and a fuel distributor line with a connecting piece for each fuel injector. For sealing a connection of each fuel injector to the respective connecting piece of the fuel distributor line, a ring-shaped seal support is provided for each, having an inner sleeve which is guided by a guide section of the inlet section, and having an outer sleeve which radially surrounds the inner sleeve and is elastically connected to the inner sleeve radially. The seal support together with the outer sleeve surrounds a sealing element. At the same time, the sealing element is peripherally in contact with an inside wall of the connecting piece and axially in contact with a radial end face of the inlet section of the fuel injector.
    Type: Grant
    Filed: November 6, 2002
    Date of Patent: March 9, 2004
    Assignee: Robert Bosch GmbH
    Inventor: Uwe Liskow
  • Publication number: 20030154961
    Abstract: A mounting device for securing a fuel injector (1) in a cylinder head (2) of an internal combustion engine has at least one hold-down device (11) which is mounted on a front face (12) of the cylinder head (2) and secures fuel injector (1) in a receiving bore (9) of the cylinder head (2). The at least one hold-down device (11) is supported by a shoulder (7) which is formed at the downstream end (6) of the fuel injector (1) and surrounds the fuel injector (1) at least partially.
    Type: Application
    Filed: April 16, 2003
    Publication date: August 21, 2003
    Inventor: Uwe Liskow
  • Publication number: 20030150427
    Abstract: A fuel injector (1) for the direct injection of fuel, especially into the combustion chamber of a mixture-compressing internal combustion engine having external ignition, is located in a cylinder head (2) of the internal combustion engine in a receiving bore (8) of the cylinder head (2), and includes a nozzle body (10) and a sealing ring (14) which seals the fuel injector (1) from the cylinder head (2) of the internal combustion engine. At an end (12) on the discharge side of the fuel injector (1), an at least partially spherical body (13) is formed which abuts at least partially against a wall (9) of the receiving bore (8), a groove (15) being circumferentially formed on the body (13) in which the sealing ring (14) is positioned.
    Type: Application
    Filed: April 16, 2003
    Publication date: August 14, 2003
    Inventor: Uwe Liskow
  • Publication number: 20030145831
    Abstract: A fuel injection system including at least one fuel injector having an inlet section and a fuel distributor line with a connecting piece for each fuel injector. For sealing a connection of each fuel injector to the respective connecting piece of the fuel distributor line, a ring-shaped seal support is provided for each, having an inner sleeve which is guided by a guide section of the inlet section, and having an outer sleeve which radially surrounds the inner sleeve and is elastically connected to the inner sleeve radially. The seal support together with the outer sleeve surrounds a sealing element. At the same time, the sealing element is peripherally in contact with an inside wall of the connecting piece and axially in contact with a radial end face of the inlet section of the fuel injector.
    Type: Application
    Filed: November 6, 2002
    Publication date: August 7, 2003
    Inventor: Uwe Liskow
  • Publication number: 20030066516
    Abstract: In an internal combustion engine, the fuel reaches a combustion chamber via at least one fuel-injecting device. The fuel-injecting device includes a piezo actuator. The drive energy (U), which is necessary for a specific stroke (h) of the piezo actuator, is determined from at least one function (34 to 40) which couples the stroke (h), the drive energy (U) and the drive time (t) of the piezo actuator with each other. In order to more accurately adjust the stroke of the piezo actuator, it is suggested that a function (34 to 40) be used for the determination of the drive energy (U). These functions (34 to 40) were previously determined for a typical collective load (L1, L2) to which a piezo actuator is subjected.
    Type: Application
    Filed: October 10, 2002
    Publication date: April 10, 2003
    Inventor: Uwe Liskow
  • Publication number: 20030047160
    Abstract: A fuel injector (1), particularly a fuel injector for fuel injection systems in internal combustion engines, has a valve needle (3), which cooperates with a valve-seat surface (6) to form a sealing seat, and an armature (20), which engages with the valve needle (3), the armature (20) being movable along the axis of the valve needle (3) and being damped by a damping element (32) made from an elastomer. In this context, a first intermediate ring (34) is situated between the armature (20) and the damping element (32). The damping element (32) rests on the flange (31), which is connected in a force-locking manner to the valve needle (3). The intermediate ring (34) and/or the flange (31) is furnished with radial and/or axial channels which connect an interior volume (36) located between the valve needle (3) and the damping element (32) to a central cutaway (42) of the fuel injector (1).
    Type: Application
    Filed: August 19, 2002
    Publication date: March 13, 2003
    Inventors: Klaus Noller, Uwe Liskow, Martin Buehner, Guido Pilgram, Juergen Maier, Hartmut Albrodt
  • Publication number: 20020157650
    Abstract: The present invention relates to a method and a circuit system for operating a solenoid valve (MV), particularly for actuating an electrohydraulic gas-exchange valve control, an injection valve, or an intake or exhaust valve of an internal combustion engine. To permit the simplest possible driving of the solenoid valve (MV), it is proposed that the solenoid valve (MV) be acted upon in a controlled manner in a cycle including three phases, in which in a pull-up phase, the solenoid valve (MV) is connected for a predefined time duration (T—1) to a first voltage (U—1) of predetermined magnitude for generating a pull-up current, in a holding phase is connected to a second voltage (U—2) of predetermined magnitude for generating a holding current, and in a de-energize phase is separated from both voltages (U—1, U—2).
    Type: Application
    Filed: January 15, 2002
    Publication date: October 31, 2002
    Inventors: Herman Gaessler, Udo Diehl, Karsten Mischker, Rainer Walter, Juergen Schiemann, Christian Grosse, Volker Beuche, Stefan Reimer, Uwe Liskow
  • Publication number: 20020125346
    Abstract: A fuel injector (16) for fuel injecting systems of internal combustion engines having a valve needle (3) has a valve seat surface (1) at a valve seat element (2). The valve seat surface (1) acts together with a valve closing element (5) to form a sealing seat (4). The fuel injector (16) further has a magnetic coil (6), an armature (8) engaging the valve needle (3), and at least one fuel channel (9) on armature (8) and/or valve needle (3) for supplying fuel to sealing seat (4). Fuel channel (9) has a flow valve (10) which throttles the fuel flow through fuel channel (9) more strongly during a closing movement of the armature (8) than during an opening movement of armature (8). In one specific embodiment, flow valve (10) is activated by a magnetic field (11) generated by magnetic coil (6) and an operating element (14) made of ferromagnetic material.
    Type: Application
    Filed: November 20, 2001
    Publication date: September 12, 2002
    Inventor: Uwe LIskow
  • Patent number: 6269800
    Abstract: A device for feeding fuel from a supply container to an internal combustion engine of a motor vehicle has a supply container, a collecting cup arranged in the supply container, a fuel feeding pump which aspirates fuel from the collecting cup, a feeding conduit into which the aspirated fuel is fed to the internal combustion engine, a return conduit through which a fuel is returned back to said supply container, a jet pump arranged in the supply container and having a jet nozzle connected with the return conduit, a mixing pipe which is open in the collecting cup and is substantially in alignment with the jet nozzle, a suction opening provided between the jet nozzle and the mixing pipe, a check valve flap arranged in the collecting cup and closing an outlet of the mixing pipe, the check valve flap being formed so that it deviates a filling jet of the jet pump which is supplied from fuel from the supply container into the suction cup against a fuel pressure in the suction cup, from the outlet of the mixing pipe.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: August 7, 2001
    Assignee: Robert Bosch GmbH
    Inventors: Rolf Fischerkeller, Uwe Liskow
  • Patent number: 6213143
    Abstract: A liquid filter (1) with a built-in pressure regulator (11) for fuel is proposed, in which the pressure regulator (11) with its diaphragm (32) is mounted on the inside of a cap (14) that has the inflow connector (16) and the tank connector (17). The diaphragm (32), which experiences a flow on its inside, is acted upon by the pressure of the fuel on the clean side (25) of the filter element (21), and the flow through the filter element is radially from the outside inward. Integrating the pressure regulator (11) in the cap enables a simple, compact, economical design of the liquid filter (10), through whose valve (36) in the pressure regulator (11) only cleaned fuel flows.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: April 10, 2001
    Assignee: Robert Bosch GmbH
    Inventors: Helmut Schwegler, Uwe Liskow, Lorenz Drutu, Ulrich Projahn, Bernhard Lucas, Wolfgang Bueser
  • Patent number: 5901742
    Abstract: A pressure control valve in which the mass to be moved by the diaphragm is reduced by providing that a valve seat body having a valve seat face is placed in a middle region of the diaphragm. When the valve seat face lifts away from the valve closing body, fuel to be diverted flows from the pressure control side of the diaphragm to the return side of the diaphragm, via the valve seat face and a return conduit The pressure control valve is especially suitable for use in fuel supply systems of internal combustion engines.
    Type: Grant
    Filed: June 19, 1996
    Date of Patent: May 11, 1999
    Assignee: Robert Bosch GmbH
    Inventors: Stephan Kleppner, Helmut Schwegler, Kurt Frank, Wolfgang Bueser, Uwe Liskow, Lorenz Drutu
  • Patent number: 5464319
    Abstract: In a peripheral pump with an impeller with a plurality of vanes and a pump chamber, the impeller has a ring-shaped supply passage in each limiting wall, and supply passages are connected over a periphery of the impeller. A suction opening is formed in one wall part, and the front supply passage is formed in this wall part separately from the suction opening and after the suction opening in a rotary direction of the impeller. The rear supply passage is formed in the other wall part and is formed in the peripheral region of the suction opening. During the operation fuel flows through the suction opening only into the rear supply passage, and in the rotary direction first after the suction opening flows from the rear supply passage which has a reduced cross-section, into the front supply passage which has an increased cross-section.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: November 7, 1995
    Assignee: Robert Bosch GmbH
    Inventor: Uwe Liskow
  • Patent number: 5364246
    Abstract: An aggregate for feeding fuel from a supply tank to an internal combustion engine of a motor vehicle has a feeding pump having two end walls forming a pump chamber with a suction opening and a pressure opening and a feed element rotatable in the pump chamber so as to supply fuel from the suction opening to the pressure opening. At least one of the end walls is provided with a groove-shaped unloading passage in a region between an end surface of the feeding element and a sealing surface of the one end wall and communicating through a further opening the pump chamber with a low pressure region. The suction opening has an end facing in a rotary direction of the feeding element. The unloading passage is located near the end of the suction opening.
    Type: Grant
    Filed: September 23, 1993
    Date of Patent: November 15, 1994
    Assignee: Robert Bosch GmbH
    Inventors: Kurt Frank, Uwe Liskow, Jochen Thoenissen, Uwe Loistl, Oliver Wahl
  • Patent number: 5350285
    Abstract: An aggregate for feeding fuel from a supply tank to the internal combustion engine of a motor vehicle, has a pump chamber with a suction opening for receiving fuel and a pressure opening for supplying a fuel and a feeding element rotating in the pump chamber and feeding fuel from the suction opening to the pressure opening. At least one of the chamber end walls in a region of a sealing surface formed between an end surface of the feeding element and one of the chamber walls has an opening which leads to an unloading space, and the opening as considered in a rotary direction of the feeding element is located near one edge which limits the suction opening, and has a radial extension which is at least equal to a radial extension of the suction opening.
    Type: Grant
    Filed: July 23, 1993
    Date of Patent: September 27, 1994
    Assignee: Robert Bosch GmbH
    Inventors: Uwe Liskow, Jochen Thoennissen, Uwe Loistl, Oliver Wahl
  • Patent number: 5203308
    Abstract: A device for injecting a fuel-gas mixture in which the fuel stream is injected via injection ports of a fuel injection valve into distributor openings of a distributor line in a distributor housing. The fuel streams are injected in aimed fashion from the injection ports via fuel transport conduits into the distributor openings, which has an advantage of accurate fuel allocation to the various distributor openings and of maximally homogeneous mixture formation. The gas for the gas-fuel mixture flows out of a central gas delivery opening via a gas distributor chamber and via a respective gas gap to one distributor opening each, where it envelops the applicable fuel stream in which the gas and fuel is conducted to an intake tube or directly into the cylinder.
    Type: Grant
    Filed: November 20, 1991
    Date of Patent: April 20, 1993
    Assignee: Robert Bosch GmbH
    Inventor: Uwe Liskow
  • Patent number: 5197674
    Abstract: The apparatus has a fuel injection valve with an injection end which rests on a bearing face of a stepped longitudinal bore. An annular gas conduit communicates with a gas source and an annular gas gap formed between the bearing face and a mixing chamber, and an exact, symmetrical, annular gas gap is formed between the injection end and the stepped longitudinal bore. The embodiment of the apparatus is especially suitable for use in internal combustion engines with externally supplied ignition.
    Type: Grant
    Filed: October 22, 1991
    Date of Patent: March 30, 1993
    Assignee: Robert Bosch GmbH
    Inventors: Wolfgang Ketterer, Uwe Liskow, Harald Kalup