Patents by Assignee MTU Friedrichshafen
  • Publication number: 20160186709
    Abstract: A method for the injector-specific diagnosis of a fuel injection device of an internal combustion engine, including the following steps: detecting a pressure progression in an individual accumulator of an injector in a time-resolved manner; evaluating the detected pressure progression; determining if there is a fault state of the injection device in the region of the injector on the basis of the detected and evaluated pressure progression; and identifying the fault state on the basis of the detected and evaluated pressure progression.
    Type: Application
    Filed: August 1, 2014
    Publication date: June 30, 2016
    Applicant: MTU Friedrichshafen GMBH
    Inventors: Michael WALDER, Andreas MEHR, Frank MLICKI, Alexander BERNHARD, Christian WOLF
  • Patent number: 9371773
    Abstract: A two-stage supercharger for an engine having a radial high-pressure turbine and an axial low-pressure turbine. The high-pressure turbine has a spiral housing with an exhaust-gas inlet connected to an exhaust line and via which exhaust-gas flows from the engine to the high-pressure turbine. A partial flow of the exhaust-gas flows past the high-pressure turbine in a bypass unit and is adjustable by a shut-off valve. The bypass unit includes a branch line and an annular duct housing integral with the spiral housing. The branch line branches off the exhaust-gas inlet at a point where the shut-off valve is arranged and issues into a duct of the annular duct housing. The partial flow flows through the branch line into the duct and an axially arranged annular gap into an exhaust-gas duct. The partial flow merges with a main exhaust-gas flow from the high-pressure turbine and flows into the low-pressure turbine.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: June 21, 2016
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Andreas Thoss, Thomas Zink
  • Publication number: 20160159338
    Abstract: A system control unit for controlling a charging system that is intended for charging an electrical energy storage device, comprising an electric generator; an internal combustion engine that is mechanically connected with the electric generator; a generator controller for controlling the electric generator; an engine controller for controlling the internal combustion engine; and a transmitting device for transmission of messages, whereby the engine controller is connected with the generator controller by way of the transmitting device, and whereby the engine controller is operable in that a message containing information about an operating state of the internal combustion engine can be produced and said message can be sent to the generator controller via the transmitting device.
    Type: Application
    Filed: February 18, 2016
    Publication date: June 9, 2016
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Eckhard Osterloff, Martin Roscher, Arndt Von Drathen, Gerhard Droullier
  • Patent number: 9347409
    Abstract: Proposed is a method for controlling and regulating an internal combustion engine (1) having a common rail system and having a passive pressure limiting valve (11) for discharging fuel out of a rail (6) into the fuel tank (2), in which method, in a first stage, the pressure limiting valve (11) is set as open when the rail pressure, proceeding from a steady-state rail pressure, exceeds a first threshold value and subsequently falls below a second threshold value within a first critical time, wherein the first threshold value characterizes a higher pressure level than the steady-state rail pressure and the second threshold value characterizes a lower pressure level than the first threshold value, and in which method the opening duration of the opened pressure limiting valve (11) is monitored.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: May 24, 2016
    Assignee: MTU Friedrichshafen GmbH
    Inventor: Armin Dölker
  • Publication number: 20160123205
    Abstract: A method for operating a driving system having an internal combustion engine and an exhaust gas purifying device through which exhaust gas from the internal combustion engine flows in order to be purified. The exhaust gas purifying device has at least one catalyst element for catalytic conversion of nitrogen monoxide into nitrogen dioxide at a determined conversion rate. In order to compensate for an agerelated decrease in the conversion rate of the catalyst element the nitrogen monoxide emission from the internal combustion engine and/or the exhaust gas temperature before the catalyst element are adjusted as a function of the current conversion rate and/or the age of the catalyst element so that the nitrogen dioxide concentration after the catalyst element is greater than or equal to a minimum concentration and/or that the molar ratio between nitrogen monoxide and nitrogen dioxide after the catalyst element corresponds to a predetermined ratio.
    Type: Application
    Filed: April 16, 2014
    Publication date: May 5, 2016
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Guido SCHÄFFNER, Andrea PROSPERO, Günter ZITZLER, Tim SPÄDER
  • Patent number: 9328689
    Abstract: The invention relates to a method for the open-loop control and the closed-loop control of an internal combustion engine (1), the rail pressure (pCR) being controlled in the normal operating state in a closed loop control mode via an intake throttle (4) on the lower pressure side as the first pressure control member in a rail pressure control loop and at the same time a rail pressure disturbance variable being applied to the rail pressure (pCR) via a pressure control valve (12) on the high pressure side as the second pressure control member. For this purpose, a pressure control valve volume flow (VDRV) is redirected from the rail (6) to a fuel tank (2) via the pressure control valve (12) on the high pressure side, and an emergency operation mode is activated once a defective rail pressure sensor (9) is detected, in which emergency operation the pressure control valve (12) on the high pressure side and the intake throttle (4) on the low pressure side are actuated depending on the same set point value.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: May 3, 2016
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventor: Armin Dölker
  • Patent number: 9316180
    Abstract: In an exhaust gas turbocharger system for charging an engine including a compressor arrangement at a charging fluid side LL and a turbine arrangement at an exhaust gas side AG, a further compressor which is driven by a separate controllable drive and whose primary side is connected to the charging fluid side LL while its secondary side is connected to the exhaust gas side is provided for compressing charge air taken from the charging fluid side and supply it to the exhaust gas side for assisting driving the exhaust gas turbines so as to maintain them at relatively high speeds in transition periods including engine idling.
    Type: Grant
    Filed: April 27, 2013
    Date of Patent: April 19, 2016
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventor: Joerg Heiermann
  • Publication number: 20160084210
    Abstract: In a quantity limiting valve for a fuel injection system of an internal combustion engine including a cylinder with an inflow region and an outflow region separated by a piston axially movably disposed in the cylinder and a flow limiting fluid flow path extending along the piston between the inflow and outflow regions wherein the piston is biased with its front surface into contact with a stop element, the contact area between the front surface and the stop surface includes between the piston and the stop element a contact structure providing for an intermediate space which is in communication with the inflow region thereby to expose the front surface of the piston to the pressure of the fluid in the inflow region.
    Type: Application
    Filed: December 7, 2015
    Publication date: March 24, 2016
    Applicant: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Robby GERBETH, Michael WALDER, Andreas MEHR, Markus STAUDT, Frank MLICKI
  • Publication number: 20160084191
    Abstract: A method and an assembly for controlling the pressure in a high-pressure region of an injection system in an internal combustion engine. A set high pressure is compared to an actual high pressure in order to determine a control deviation, the control deviation representing an input variable of a controller. A high pressure pump is controlled by a solenoid valve and the angle at which the delivery of fuel by the at least one high-pressure pump is to start is used as a manipulated variable of the high-pressure closed-loop control system.
    Type: Application
    Filed: May 23, 2014
    Publication date: March 24, 2016
    Applicant: MTU Friedrichshafen GMBH
    Inventor: Armin DÖLKER
  • Patent number: 9290254
    Abstract: In a method for controlling a ship propulsion system wherein, in a first operating mode, the position of a command signal generator within a guide range including a forward and a reverse section is interpreted by a system controller as a desired power output as well as a desired travel direction, a second operating mode is provided wherein the position of the command signal generator is ignored as power output command so that the position of the command signal generator forms only as directional control device and wherein in either mode of operation, the command signal generator is automatically returned to a neutral position when the command signal generator is released by an operator.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: March 22, 2016
    Assignee: MTU FRIEDRICHSHAFEN GmbH
    Inventor: Adelbert Kern
  • Patent number: 9273620
    Abstract: The invention relates to a method for regulating a gas engine (1) having a generator (5), wherein a regulator torque is calculated by means of a speed regulator from a speed regulator deviation, wherein a target volume flow is calculated at least as a function of the regulator torque, wherein a fuel volume is determined as a proportion of a fuel-air mixture as a function of the target volume flow, and wherein a target receiver pipe pressure is also calculated as a function of the target volume flow as a guide parameter for a receiver pipe pressure regulating circuit for regulating the mixture pressure (pRRA, pRRB) of a fuel-air mixture in the receiver pipe (12, 13) above the inlet valves of the gas engine (1). The invention is characterized in that a deviation of the regulator torque from a generator torque is calculated and the target receiver pipe pressure is corrected using the deviation.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: March 1, 2016
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventor: Ludwig Kläser-Jenewein
  • Publication number: 20160053724
    Abstract: A gas internal combustion engine, having a gas mixer, an intake section and an engine with cylinders. A fuel mixture having a charging mixture is fed to the engine. The engine is operated in the gas mode with gas as the fuel in the charging mixture. By an input mixture portion, assigned to an earlier mixture state, of a gas/air mixture, an output mixture portion, assigned to a later mixture state, of the gas/air mixture is determined, The determination is carried out by an intake section model which serves as a basis of a computing model for the intake section. The output mixture portion of the gas/air mixture is determined an engine feed, the input mixture portion of the output mixture portion is determined over a number of intermediate states of the mixture portion in a number of assigned volumes of the intake section. The intake mixture portion of a gas/air mixture is determined at the gas mixer, and an air stream and/or gas stream is set at the gas mixer in accordance with the input mixture portion.
    Type: Application
    Filed: January 20, 2014
    Publication date: February 25, 2016
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Andreas FLOHR, Andreas GELLER
  • Patent number: 9248394
    Abstract: An air scoop-cyclone filter assembly having an air scoop for guiding untreated air, which including an inlet opening, a deflection area for deflecting untreated air and an outlet opening, and having a cyclone filter for cleaning untreated air, which is connected downstream of the air scoop in the flow direction and is connected in an airtight manner to the air scoop A perforated plate is arranged in the cyclone filter as a filter inlet opening. The perforated plate has a first passage area having a high number of holes, a second passage area having a low number of holes at the geodetically deepest point, and a baffle plate. The baffle plate distributes the untreated air flow through the first and second passage area and, with the outer wall of the air scoop, forms a collecting chamber that stabilizes the flow.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: February 2, 2016
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Dagmar Neu, Ingmar Berger, Patrick Spengler, Timo Stache, Dirk Pfuderer
  • Publication number: 20150377167
    Abstract: A method for correcting a fuel quantity injected by a fuel injection device during operation of an internal combustion engine, including: determining an air heat characteristic variable, on which an air heat stream fed to a combustion chamber of the engine functionally depends; determining an exhaust heat characteristic variable, on which an exhaust heat stream discharged from the combustion chamber functionally depends; determining a heat distribution factor, which specifies a fraction of the exhaust heat stream reduced by the air heat stream in relation to a heat stream fed with the injected fuel to the combustion chamber; calculating a fuel mass fed to the engine from the air heat characteristic variable, the exhaust heat characteristic variable and the heat distribution factor; calculating a comparison variable by comparing the calculated fuel mass with a fuel mass setpoint value and adapting actuation of the fuel injection device depending on the comparison variable.
    Type: Application
    Filed: January 23, 2014
    Publication date: December 31, 2015
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Andreas FLOHR, Francois LAYEC
  • Publication number: 20150377199
    Abstract: A method for venting a fuel supply line of a direct-injection internal combustion engine, wherein the fuel supply line has an injector, a high-pressure accumulator upstream of the injector, a flow rate limiting valve between the high-pressure accumulator and the injector for the purposes of limiting a fuel flow rate passing from the high-pressure accumulator to the injector, and a high-pressure pump upstream of the high-pressure accumulator for delivering fuel into the high-pressure accumulator. A pressure in the high-pressure accumulator is regulated by an intake throttle arranged upstream. of the high-pressure pump. In this case, it is provided that the fuel supply line is vented downstream of the high-pressure pump, wherein, during venting operating mode, a passage cross section for the fuel which is smaller than or equal to a predetermined threshold passage cross section is set in the intake throttle.
    Type: Application
    Filed: March 5, 2014
    Publication date: December 31, 2015
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Marc RADL, Klaus REISCHMANN, Michael WILLMANN
  • Publication number: 20150369159
    Abstract: A method and an arrangement for operating an internal combustion engine. In the method, an injection start is calculated by a filter, starting from a standard injection start and at least one of the filter parameters is selected in accordance with the operating mode of the internal combustion engine.
    Type: Application
    Filed: December 19, 2013
    Publication date: December 24, 2015
    Applicant: MTU Friedrichshafen GmbH
    Inventor: Armin DÖLKER
  • Publication number: 20150369163
    Abstract: A method for operating an internal combustion engine having at least one fuel injection valve for introducing fuel into a combustion chamber of the internal combustion engine, the valve being supplied with a specified current intensity in order to adjust a specified flow cross-section of a fuel fluidic connection in the combustion chamber. The maximum specified current intensity during normal operation is equal to a first current intensity and during a release operation is equal to a second, higher current intensity.
    Type: Application
    Filed: January 23, 2014
    Publication date: December 24, 2015
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Ronald HEGNER, Michael WILLMANN, Marc RADL
  • Publication number: 20150369122
    Abstract: A method for cleaning a combustion chamber of an internal combustion engine, having the following steps: introducing a gaseous substance into a cooling device, wherein the gaseous substance has, at least upstream of the cooling device, a relative humidity of greater than 0%; cooling the substance in the cooling device to below a dewpoint, such that water precipitate is formed; introducing the substance and the precipitate into a combustion chamber of the internal combustion engine; performing a combustion reaction in the combustion chamber; and discharging residues from the combustion chamber.
    Type: Application
    Filed: December 19, 2013
    Publication date: December 24, 2015
    Applicant: MTU Friedrichshafen GmbH
    Inventor: Bernhard STILLER
  • Patent number: 9217444
    Abstract: Intake manifold element (1) having a tubular section (3) through which a first fluid (A) can flow in a proposed flow direction (A?) via a flow channel (4) from an inlet (4a) to an outlet (4b) of the same, said tubular section being provided for arrangement on a compressor inlet (11a) of a turbocharger, characterized in that the flow channel (4) has a nozzle-shaped design, wherein its cross-section which the fluid can flow through is tapered in the flow direction (A?), wherein the tubular section (3) forms a chamber (6) adjacent to the nozzle-shaped flow channel (4) which serves as flow path from an inlet (6a) to an outlet (6b) for the aspiration of a second fluid (B), the pressure level of said chamber on the inlet (6a) being dependent on the pressure level of the first fluid (A) on the outlet (4b) of the flow channel (4) via communicating outlets (6b, 4b) of the chamber (6) and the flow channel (4).
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: December 22, 2015
    Assignee: MTU Friedrichshafen GmbH
    Inventors: Ingmar Berger, Tobias Männle, Kajetan Plenk
  • Patent number: 9205829
    Abstract: A method for operating a traction vehicle, especially a locomotive, wherein the power delivered by a drive system is produced by at least two internal combustion engines, each of which is functionally connected to a generator for producing electric power, the engines preferably being gas engines, even more preferably lean gas engines. A previously determined number of separate power stages ranging from a minimum power up to a nominal power of the drive system is provided. The interval between all directly adjacent power stages is selected so that it corresponds to a constant fraction of the nominal power of the drive system.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: December 8, 2015
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventor: Joachim Hug