Patents Assigned to MTU Friedrichshafen GmbH
  • Publication number: 20220145821
    Abstract: A method for monitoring a fuel supply system in an internal combustion engine includes the steps of: recording a first pressure value in the fuel supply system in a region of the fuel supply system associated with a pre-filter and upstream of a low pressure pump; recording a second pressure value in the fuel supply system downstream of the low pressure pump in a region of the fuel supply system associated with a primary filter; monitoring the first pressure value and the second pressure value for an error state of the fuel supply system; and recognizing the error state only if the error state is plausible on a basis of both the first pressure value and the second pressure value.
    Type: Application
    Filed: January 28, 2022
    Publication date: May 12, 2022
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Thomas Kottke, Robby Gerbeth, Thilo Kreeb, Martin Hähnlen
  • Patent number: 11255415
    Abstract: A belt-tensioning device, in particular for an internal combustion engine, the belt-tensioning device including a bearing housing having a latching recess, a tensioning roller, a pivoting arm and a locking device. The pivoting arm is mounted on the bearing housing, the pivoting arm being under a torsion spring load. The tensioning roller being coupled to the pivoting arm. The locking device having a first latching device and a second latching device. The first latching device and the second latching device being coupled with the pivoting arm. The latching recess interacts with at least one of the first latching device and the second latching device wherein the locking device is configured in such a way that the pivoting arm can be locked by the locking device in different predefined latching positions and the pivoting arm can be pivoted with predefined freedom in an operating position.
    Type: Grant
    Filed: October 3, 2019
    Date of Patent: February 22, 2022
    Assignee: MTU Friedrichshafen GmbH
    Inventor: Alexander Gross
  • Publication number: 20220042476
    Abstract: A method for operating an internal combustion engine with a high pressure accumulator for a fuel injection system, includes the steps of: monitoring, in a time-dependent manner, a high pressure in the fuel injection system; conducting a check, at a high pressure-dependent starting time point, as to whether a continuous injection detection is to be carried out; and checking whether a high-pressure oscillation has occurred within an oscillation time interval prior to a starting time.
    Type: Application
    Filed: September 17, 2021
    Publication date: February 10, 2022
    Applicant: MTU Friedrichshafen GmbH
    Inventor: Armin Dölker
  • Patent number: 11208967
    Abstract: A method for operating an internal combustion engine having an injection system which has a high-pressure accumulator, high pressure in the high-pressure accumulator being controlled via a suction throttle on the low-pressure side, acting as a first pressure control element in a first high-pressure control loop. During normal operation, a high-pressure disturbance variable is produced by a pressure regulating valve on the high-pressure side, acting as an additional pressure control element, via which fuel is re-directed from the high-pressure accumulator into a fuel reservoir, the at least one pressure regulating valve being controlled, during normal operation, based on a set volumetric flow rate for the fuel to be re-directed. A temporal development of the set volumetric rate is sensed and the set volumetric flow rate is filtered, a time constant for the filtering of the set volumetric flow rate being selected as a function of the sensed temporal development.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: December 28, 2021
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventor: Armin Dölker
  • Patent number: 11199168
    Abstract: A distributor apparatus of a common rail system for an internal combustion engine. The distributor apparatus is designed with at least one distributor device having a high-pressure line for fuel and a plurality of feed lines branching off from the high-pressure line within the distributor device. Each feed line leads to an individual accumulator and an injector. The feed line is associated with a restriction device and a discharge bore, which is designed to cooperate with a pressure-measuring device and which is arranged downstream of the restriction device, such that the restriction device is arranged in the feed line and the discharge bore, arranged in the distributor device, is connected to the feed line downstream of the restriction device.
    Type: Grant
    Filed: September 1, 2020
    Date of Patent: December 14, 2021
    Assignee: MTU Friedrichshafen GmbH
    Inventors: Robby Gerbeth, Oscar Blasco, Hubert Lugger, Frank Mlicki, Thilo Kreeb
  • Publication number: 20210372343
    Abstract: A method for operating an injection system of an internal combustion engine, including: providing the injection system includes a high pressure accumulator; regulating a high pressure in the high pressure accumulator in a normal operation by way actuating a low pressure-side suction throttle; regulating the high pressure in a first operating mode of safety operation by way of actuating at least one high pressure-side pressure control valve; carrying out a switchover from the normal operation into the first operating mode of safety operation if the high pressure reaches or exceeds a first limit pressure value; and carrying out a switchover from the first operating mode of safety operation into the normal operation if, starting from above a setpoint pressure value, the high pressure reaches or undershoots the setpoint pressure value, which is lower than the first limit pressure value.
    Type: Application
    Filed: August 13, 2021
    Publication date: December 2, 2021
    Applicant: MTU Friedrichshafen GmbH
    Inventor: Armin Dölker
  • Patent number: 11187165
    Abstract: A method for the open-loop and closed-loop control of an internal combustion engine, in particular a diesel engine or gas engine, with a generator and asynchronous machine, including the following steps: detecting at least one electrical characteristic variable of the generator, wherein the electrical characteristic variable is selected from current, voltage or frequency; determining a characteristic variable change in the electrical characteristic variable of the generator in a predetermined time interval; comparing the change in characteristic variable with a first threshold value; and in the event that the change in characteristic variable is greater than the first threshold value, changing from a standard speed control of the internal combustion engine to a feed-forward control.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: November 30, 2021
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Stefan Hecker, Hendrik Weiss
  • Patent number: 11187140
    Abstract: A method for operating an internal combustion engine including a step of concurrently introducing at least two combustible fuel jets into a combustion chamber of an internal combustion engine. A first combustible fuel jet of the at least two combustible fuel jets is ignited at an ignition time point. In a first operating mode of the internal combustion engine a second combustible fuel jet which is different from the first combustible fuel jet of the at least two combustible fuel jets is ignited after the ignition time point.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: November 30, 2021
    Assignee: MTU Friedrichshafen GmbH
    Inventors: Joachim Schwarte, Samuel Vogel
  • Patent number: 11187174
    Abstract: A method for monitoring crankcase pressure, in which a learning curve is calculated according to a target-actual deviation of the crankcase pressure, the target crankcase pressure is adjusted according to the learning curve, and a limit curve is calculated according to the target crankcase pressure. The actual crankcase pressure is monitored for exceedance of the limit curve. After an engine start, upon identification of a steady-state operation of the internal combustion engine, the actual crankcase pressure is compared with a limit value and, if the limit value is identified as being exceeded, the learning curve and, as a result, the limit curve are reset to their initial values.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: November 30, 2021
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Johannes Baldauf, Patrick Dussler, Eugen Bucher, Vadzim Khakholka
  • Patent number: 11156183
    Abstract: A method for model-based open-loop and closed-loop control of an internal combustion engine, in which method injection system setpoint values for activating the injection system control elements are calculated dependent on a setpoint torque by a combustion model, and gas path setpoint values for activating the gas path control elements are calculated by a gas path model. The combustion model is adapted during ongoing operation of the internal combustion engine. A quality measure is calculated by an optimizer dependent on the injection system setpoint values and the gas path setpoint values, the quality measure is minimized by the optimizer by varying the injection system setpoint values and gas path setpoint values within a prediction horizon. The injection system setpoint values and gas path setpoint values are set by the optimizer, based on the minimized quality measure, as being definitive for setting of the operating point of the internal combustion engine.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: October 26, 2021
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Daniel Bergmann, Michael Buchholz, Knut Graichen, Jens Niemeyer
  • Patent number: 11149597
    Abstract: A valve drive for an internal combustion engine, including a gas exchange valve; a first mechanically driven drive mechanism; and a second drive mechanism connected to the gas exchange valve to move same. The first and second drive mechanisms connected via a hydraulic coupling device that has a pressure chamber, which can be relieved of pressure via a valve device and is designed to couple the drive mechanisms by hydraulic pressure and to decouple same in a pressure-relieved state. The valve device has two switch valves fluidically connected to the pressure chamber in parallel and via which the pressure chamber is relieved of pressure in the open state of at least one of the switch valves. The valve drive has a controller that actuates the switch valves in a delayed manner to provide a variable valve stroke of the gas exchange valve during a stroke movement.
    Type: Grant
    Filed: December 11, 2017
    Date of Patent: October 19, 2021
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Wolfgang Fimml, Jonathan Lipp, Johannes Schalk
  • Patent number: 11149664
    Abstract: A method for monitoring a cylinder pressure sensor, in which method the sensor value is checked for admissibility and inadmissibility in a predefinable crankshaft angle range, when admissibility is detected the cylinder pressure sensor is used further and when inadmissibility is detected the cylinder pressure sensor is deactivated. A first sensor value of the cylinder pressure sensor is set as a start value, and a second sensor value is set as a stop value, a plateau range is determined from the number of sampling steps between the start value and the stop value, and the plateau range is set as decisive for the admissibility or inadmissibility of the sensor values.
    Type: Grant
    Filed: May 3, 2018
    Date of Patent: October 19, 2021
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Tobias Frank, Aron Toth, Horst Weidele
  • Patent number: 11079255
    Abstract: A method determines a generator system load and/or rotor angle. The generator system has a generator with a generator terminal outputting electrical power generated by the generator, a transformer and a point of common coupling, PCC, terminal. The transformer is between the generator and PCC terminals. The method includes: determining the generator field current; determining the output voltage, the output current and the power factor and/or angle of the output voltage and output current from the generator terminal, and determining the load angle of the generator system, output voltage from the generator terminal, output current from the generator terminal and the power factor and/or angle; and/or determining the output voltage, the output current and the power factor and/or angle of the output voltage and output current, and determining the rotor angle of the generator system, output voltage, output current from the PCC terminal and the power factor and/or angle.
    Type: Grant
    Filed: May 2, 2019
    Date of Patent: August 3, 2021
    Assignees: ROLLS-ROYCE plc, MTU FRIEDRICHSHAFEN GMBH, MTU ONSITE ENERGY GMBH
    Inventors: Johannes Demharter, Souvik Dasgupta, Michael Kreissl, Amit K Gupta, Vsk Murthy Balijepalli
  • Publication number: 20210231071
    Abstract: A method for regulation of an internal combustion engine with an SCR catalytic converter in which the operating point of the engine is predefined by an engine control unit and the operating point of the catalytic converter is predefined by an SCR control unit. An overall system quality measure is calculated by an optimizer in accordance with fed back values of the engine control unit and fed back values of the SCR control unit, by changing the default values for the engine control unit and the SCR control unit, the optimizer minimizes the overall system quality measure for a prediction horizon regarding operating costs. On the basis of the minimized overall system quality measure the optimizer sets the default values for the engine control unit and the default values for the SCR control unit as decisive for setting the operating point of the engine and the catalytic converter.
    Type: Application
    Filed: March 26, 2021
    Publication date: July 29, 2021
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Knut Graichen, Daniel Bergmann, Roman Geiselhart, Jens Niemeyer, Jörg Remele, Karsten Harder, Tim Späder
  • Patent number: 11073079
    Abstract: A method for operating an internal combustion engine having an engine with a first number of cylinders and a second number of cylinders and a supercharger arrangement, wherein a charge air flow supplied to the engine is compressed by means of at least one compressor and at least one turbine is acted on by an exhaust gas flow discharged from the engine. In a main operating mode, the engine operates the first number of cylinders in two-stroke operation and the second number of cylinders in four-stroke operation. A scavenging gradient of the engine is greater for the cylinders operated in the two-stroke operation than for the cylinders operated in the four-stroke operation.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: July 27, 2021
    Assignee: MTU Friedrichshafen GmbH
    Inventors: Günther Schmidt, Ralf Speetzen
  • Patent number: 11067024
    Abstract: A method for requirement-based servicing of an injector in a common-rail system in which, during ongoing operation of the engine, a current operating point is stored as a function of the rail pressure and of the fuel injection mass, and the current operating point is multiplied by a damage factor and is stored as a reference injection cycle as a function of the rail pressure as well as of the fuel injection mass. A total reference injection cycle is calculated by forming sums over the reference injection cycles, and a load factor is calculated as a function of the total reference injection cycle and the permissible injection cycles, and the load factor is set as decisive for the servicing recommendation of the injector.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: July 20, 2021
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Ion Madan, Michael Mohr, Rolf Pfeifer, Patrick Stöckle
  • Publication number: 20210180535
    Abstract: A method for the model-based control and regulation of an internal combustion engine. The method includes calculating, as a function of a set torque, injection system set values for controlling the injection system actuators via a combustion model and calculating gas path set values for controlling the gas path actuators via a gas path model. The combustion model is adapted during operation of the internal combustion engine into the form of a complete data-based model. A measure of quality is minimized by an optimizer by changing the injection system set values and gas path set values within a prediction horizon, and the injection system set values and gas path set values are set by the optimizer, which is critical for adjusting the operating point of the internal combustion engine by using the minimized measure of quality.
    Type: Application
    Filed: February 2, 2021
    Publication date: June 17, 2021
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Knut Graichen, Michael Buchholz, Daniel Bergmann, Jens Niemeyer, Jörg Remele
  • Publication number: 20210115868
    Abstract: A method for operating an internal combustion engine, including aligning an injection behavior of the number of injectors. Aligning the injection behavior includes switching off one injector of the number of injectors, detecting a signal of the internal combustion engine that is to be assigned to the switched off injector, determining an alignment characteristic from the signal and assigning the alignment characteristic to the switched off injector as an alignment characteristic assigned to the injector, and switching on the previously switched off injector. Aligning the injection behavior further includes performing the aforementioned steps sequentially for the other injectors of the number of injectors and correcting a control of an injector that is to be corrected using the measured value assigned to the injector that is to be corrected.
    Type: Application
    Filed: December 22, 2020
    Publication date: April 22, 2021
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Tobias Frank, Jörg Remele, Aron Toth
  • Patent number: 10975795
    Abstract: A method for model-based control and regulation of an internal combustion engine. An emission class for operating the engine is read from a first library by an optimizer; a maximum mechanical component load is read from a second library by the optimizer using the engine type; and the emission class and the component load are set as mandatory for a combustion model and a gas path model. Injection system target values for actuating injection system actuators are calculated using the combustion model based on a target torque. Gas path target values for actuating gas path actuators are calculated using the gas path model based on the target torque. A quality measurement is calculated by the optimizer based on the injection system and gas path target values. The quality measurement is minimized by the optimizer by changing the injection system and gas path target values within a prediction horizon.
    Type: Grant
    Filed: July 20, 2018
    Date of Patent: April 13, 2021
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Jens Niemeyer, Andreas Flohr, Jörg Remele, Christian Wolf
  • Publication number: 20210101468
    Abstract: A method for operating an internal combustion engine. The method includes providing a piston engine. The piston engine includes a crankshaft and a torque sensor system. The torque sensor system includes at least one first rotary angle sensor and at least one second rotary angle sensor. The method further includes measuring a first and a second rotary angle in a spacing region and determining an angular offset between the first and the second rotary angle. The angular offset results from the torsion of the loaded crankshaft wherein the spacing region is limited along the crankshaft to an actual partial region of the spacing between the bearing journals. The partial region includes an actual subgroup of at least one of the number of offsets and the number of shaft journals, so that the angular offset is assigned to the actual subgroup.
    Type: Application
    Filed: December 16, 2020
    Publication date: April 8, 2021
    Applicant: MTU Friedrichshafen GmbH
    Inventors: Helmut Knabe, Horst Weidele, Aron Toth