Patents by Inventor Steffen Hirschmann
Steffen Hirschmann 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).
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Patent number: 11885256Abstract: A method for operating an internal combustion engine including feeding a pilot quantity of gas fuel, into a prechamber before a piston reaches a top dead center position. The method comprises autoignition of the pilot quantity of gas fuel in the prechamber, feeding a main quantity of gas fuel into the prechamber after the autoignition, and ignition of the main quantity of gas fuel by the conditions in the prechamber that are brought about by the autoignited pilot quantity. The method makes it possible to operate an internal combustion engine purely with methane or some other gaseous fuel, by means of compression autoignition of the pilot quantity.Type: GrantFiled: March 16, 2020Date of Patent: January 30, 2024Assignee: MAN TRUCK & BUS SEInventors: Bruno Barciela Díaz-Blanco, Thomas Malischewski, Steffen Hirschmann, Dominic Hyna, Daniel Zülow
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Patent number: 11835013Abstract: The disclosure relates to a cylinder head for covering a combustion chamber of an internal combustion engine. The cylinder head comprises at least one material recess for heat isolation, which is formed in a main body of the cylinder head and is arranged between a fluid-guide channel and a cooling channel. The material recess can be produced e.g. directly during the shaping (e.g. casting or pressing) of the cylinder head and/or thereafter. For example, in the event that exhaust gas is guided through the fluid-guide channel, a significantly lower heat input occurs from the hot exhaust gas into the cooling fluid. In addition, the thermal decoupling via the material recess leads to the hot exhaust gas cooling to a lesser degree in the fluid-guide channel.Type: GrantFiled: August 30, 2019Date of Patent: December 5, 2023Assignee: MAN TRUCK & BUS SEInventors: Steffen Hirschmann, Thomas Malischewski
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Publication number: 20220307412Abstract: A method for operating an internal combustion engine including feeding a pilot quantity of gas fuel, into a prechamber before a piston reaches a top dead center position. The method comprises autoignition of the pilot quantity of gas fuel in the prechamber, feeding a main quantity of gas fuel into the prechamber after the autoignition, and ignition of the main quantity of gas fuel by the conditions in the prechamber that are brought about by the autoignited pilot quantity. The method makes it possible to operate an internal combustion engine purely with methane or some other gaseous fuel, by means of compression autoignition of the pilot quantity.Type: ApplicationFiled: March 16, 2020Publication date: September 29, 2022Inventors: Bruno Barciela Díaz-Blanco, Thomas Malischewski, Steffen Hirschmann, Dominic Hyna, Daniel Zülow
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Publication number: 20220251978Abstract: The invention relates to a variable valve train for switching an outlet valve of an internal combustion engine to an engine braking mode. The variable valve train has a camshaft with a first cam, which is designed as a normal operation cam, and a second cam, which is designed as an engine braking cam. A first rocking lever has a first stroke device which is designed for selectively making or breaking a first operative connection between the first cam and the outlet valve by means of the first rocking lever. A second rocking lever has a second stroke device which is designed for selectively making or breaking a second operative connection between the second cam and the outlet valve by means of the second rocking lever. A valve device selectively connects the first stroke device or the second stroke device to a fluid feed line.Type: ApplicationFiled: July 17, 2020Publication date: August 11, 2022Inventors: Thomas Malischewski, Steffen Hirschmann, Andreas Bug
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Patent number: 11359525Abstract: A device lubricates a connecting rod bearing on a crankshaft of an internal combustion engine. The device has a piston having an internal piston cooling fluid channel, and an outlet channel in fluid communication with the fluid channel. The device has a connecting rod, which is connected to the piston in an articulated, in particular pivotable, manner, and has a large connecting rod eye and a connecting channel. The large connecting rod eye is formed for receiving the connecting rod bearing. The connecting channel forms a fluid connection between the outlet channel and the large connecting rod eye so that a fluid, in particular a cooling lubricating fluid (e.g. oil), can be fed, or is fed, from the fluid channel to the large connecting rod eye via the outlet channel and the connecting channel. The connecting rod bearing can be lubricated by cooling oil from the fluid channel of the piston.Type: GrantFiled: December 7, 2018Date of Patent: June 14, 2022Assignee: MAN Truck & Bus AGInventors: Thomas Malischewski, Jens Dietrich, Steffen Hirschmann, Dominik Renner
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Patent number: 11280281Abstract: An operating method for a driver assistance system, in particular a cruise control system of a motor vehicle. The operating method comprises determining at least one operationally relevant road property of a road on an impending route of the motor vehicle, wherein the operationally relevant road property affects operation of an internal combustion engine of the motor vehicle. The operating method comprises determining a driving recommendation in accordance with the operationally relevant road property on the impending route of the motor vehicle. The operating method comprises setting the variable valve gear in accordance with the driving recommendation determined.Type: GrantFiled: May 14, 2018Date of Patent: March 22, 2022Assignee: MAN TRUCK & BUS AGInventors: Steffen Hirschmann, Dominic Hyna
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Patent number: 11220938Abstract: A device lubricates a big-end bearing on a crankshaft of an internal combustion engine. The device includes a piston with a fluid channel and an outlet channel fluidically connected thereto, and a connecting rod. The connecting rod has a small connecting rod eye, a large connecting rod eye and a connecting channel. The small connecting rod eye is fluidically connected to the outlet channel. The connecting channel forms a fluidic connection between the small and large connecting rod eyes so that a cooling lubricant fluid can be supplied from the fluid channel to the large connecting rod eye via the outlet channel, the small connecting rod eye and the connecting channel. In this way, the big-end bearing can be lubricated by cooling oil from the fluid channel of the piston.Type: GrantFiled: December 18, 2018Date of Patent: January 11, 2022Assignee: MAN Truck & Bus AGInventors: Thomas Malischewski, Jens Dietrich, Steffen Hirschmann, Dominik Renner
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Publication number: 20210348580Abstract: The disclosure relates to a cylinder head for covering a combustion chamber of an internal combustion engine. The cylinder head comprises at least one material recess for heat isolation, which is formed in a main body of the cylinder head and is arranged between a fluid-guide channel and a cooling channel. The material recess can be produced e.g. directly during the shaping (e.g. casting or pressing) of the cylinder head and/or thereafter. For example, in the event that exhaust gas is guided through the fluid-guide channel, a significantly lower heat input occurs from the hot exhaust gas into the cooling fluid. In addition, the thermal decoupling via the material recess leads to the hot exhaust gas cooling to a lesser degree in the fluid-guide channel.Type: ApplicationFiled: August 30, 2019Publication date: November 11, 2021Inventors: Steffen Hirschmann, Thomas Malischewski
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Patent number: 11143138Abstract: The disclosure relates to an air inlet system for an internal combustion engine. The air inlet system has a cylinder head having an inlet channel for introducing inlet air into a combustion chamber of the internal combustion engine. The air inlet system has an air supply pipe piece, which is connected to the cylinder head and which at least partially forms an air supply channel, which opens in the inlet channel. The air inlet system additionally has thermal insulation, which is arranged in the air supply channel in order to reduce a heat transfer to the inlet air which flows in the air supply channel.Type: GrantFiled: May 16, 2018Date of Patent: October 12, 2021Assignee: MAN TRUCK & BUS AGInventors: Jens Dietrich, Thomas Malischewski, Marco Tilinski, Steffen Hirschmann
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Patent number: 10927718Abstract: The present disclosure relates to a variable valve drive, in particular with a sliding cam system, for an internal combustion engine. The variable valve drive has a shaft and a cam carrier which is arranged rotationally conjointly and axially displaceably on the shaft and which has a first cam and a second cam. The variable valve drive has an actuator device for axially displacing the cam carrier, and has a carrying device which at least partially engages around a lever axle of a force transmission device and carries the actuator device. The variable valve drive can offer the advantage that an arrangement of the actuator device which is expedient in terms of structural space is made possible in the region of the lever axle. At the same time, support of the actuator device by means of the carrying device on the lever axle can stiffen the flexible lever axle by means of the engaging-around configuration.Type: GrantFiled: May 2, 2019Date of Patent: February 23, 2021Assignee: MAN TRUCK & BUS SEInventor: Steffen Hirschmann
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Patent number: 10890087Abstract: The disclosure concerns a variable valve train for an internal combustion engine, comprising a camshaft, a gas exchange valve and a cam carrier. The cam carrier is arranged rotationally fixedly and axially displaceably on the camshaft and has a first cam and a second cam. The variable valve train has a force transmission device with a force transmission element, in particular a finger follower or rocker arm, which, depending on an axial position of the cam carrier, creates an active connection either between the first cam and the gas exchange valve or between the second cam and the gas exchange valve. The variable valve train has a first actuator for axial displacement of the cam carrier, wherein the first actuator is received at least partially in the force transmission device.Type: GrantFiled: June 22, 2018Date of Patent: January 12, 2021Assignee: MAN TRUCK & BUS AGInventors: Steffen Hirschmann, Jens Dietrich, Thomas Malischewski
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Patent number: 10738665Abstract: The present disclosure relates to a sliding cam system for an internal combustion engine. The sliding cam system has a camshaft and a plurality of cam carriers with in each case at least two cams, the plurality of cam carriers being arranged fixedly on the camshaft so as to rotate with it and in an axially displaceable manner. The sliding cam system has a plurality of fluid-actuated actuator apparatuses which are configured in each case for axially displacing a cam carrier of the plurality of cam carriers. The sliding cam system has a fluid feed apparatus which is provided for feeding a fluid in a fluidic connection upstream of the plurality of actuator apparatuses for actuating the plurality of actuator apparatuses. At least two actuator apparatuses of the plurality of actuator apparatuses are coupled fluidically for simultaneous actuation.Type: GrantFiled: August 29, 2018Date of Patent: August 11, 2020Assignee: MAN TRUCK & BUS AGInventors: Jens Dietrich, Thomas Malischewski, Steffen Hirschmann
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Patent number: 10724455Abstract: The invention relates to a method for assisted upshifting in a gear change of a transmission connected to a combustion engine. The method comprises the initiation of an upshifting process. The method comprises the reduction of an engine speed of the combustion engine by switching to an engine-braking mode, wherein a variable valve gear, in particular a trip cam system, of the combustion engine serves for switching to the engine-braking mode. Alternatively or in addition, in the engine-braking mode a first exhaust valve of the combustion engine is at first kept closed during the compression stroke and/or during the exhaust stroke for the compression of air and is opened before reaching a top dead centre of a piston movement for decompression of the compressed air.Type: GrantFiled: May 18, 2018Date of Patent: July 28, 2020Assignee: MAN TRUCK & BUS AGInventors: Steffen Hirschmann, Thomas Malischewski, Dominic Hyna
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Patent number: 10662832Abstract: The disclosure relates to a variable valve drive, in particular with a sliding cam system, for an internal combustion engine. The variable valve drive has a cam carrier which has a first and second cam and a first, second, and third engagement track. A first actuator is designed to engage into the first engagement track in order to displace the cam carrier in a first axial direction. A second actuator is designed to engage into the second engagement track in order to displace the cam carrier in a second axial direction which is opposite to the first axial direction, and to engage into the third engagement track in order to displace the cam carrier in the first axial direction. The variable valve drive can have the advantage that, even in the event of a failure of the first actuator, a displacement of the cam carrier that is normally effected by means of the first actuator is possible by means of the second actuator.Type: GrantFiled: May 2, 2019Date of Patent: May 26, 2020Assignee: MAN TRUCK & BUS SEInventors: Steffen Hirschmann, Thomas Malischewski
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Patent number: 10648372Abstract: A sliding cam system for an internal combustion engine. The sliding cam system includes a cam shaft and a cam carrier, arranged rotationally fixedly and axially movably on the cam shaft. The cam carrier including a first shifting gate and a second shifting gate. The sliding cam system includes a first actuator with an element able to move along a longitudinal axis of the cam shaft, especially a pin, which can be brought into contact with the first shifting gate for the axial movement of the cam carrier in a first direction. The sliding cam system includes a second actuator with an element able to move along the longitudinal axis of the cam shaft, especially a pin, which can be brought into contact with the second shifting gate for the axial movement of the cam carrier in a second direction which is opposite to the first direction.Type: GrantFiled: July 25, 2018Date of Patent: May 12, 2020Assignee: MAN TRUCK & BUS AGInventors: Steffen Hirschmann, Jens Dietrich
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Patent number: 10634014Abstract: A variable drive for an internal combustion engine with a first gas exchange valve, in particular outlet valve, and a second gas exchange valve, in particular outlet valve. The variable valve drive has a sliding cam system. The sliding cam system has an axially displaceable cam carrier which, for the first gas exchange valve, has only two cams, namely a first cam and a second cam offset axially with respect thereto, and, for the second gas exchange valve, has only two cams, namely a third cam and a fourth cam offset axially with respect thereto. The first cam, the second cam, the third cam and the fourth cam differ from a zero lift cam. The first cam and the third cam are identical in design. The second cam and the fourth cam differ in design.Type: GrantFiled: March 1, 2019Date of Patent: April 28, 2020Assignee: MAN TRUCK & BUS AGInventors: Thomas Malischewski, Steffen Hirschmann, Dominic Hyna
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Patent number: 10533466Abstract: A variable valve gear for an internal combustion engine of a motor vehicle has a cam carrier which is arranged on a camshaft in a manner which prevents relative rotation and allows axial movement between a first axial position and a second axial position and has a first cam and a second cam. The first cam is designed for a normal mode of the internal combustion engine, in which the first cam keeps a first exhaust valve open in the exhaust stroke. The second cam is designed for an engine braking mode of the internal combustion engine, in which the second cam initially keeps the first exhaust valve closed in the compression stroke and/or in the exhaust stroke and opens the first exhaust valve before reaching a top dead center of a piston movement.Type: GrantFiled: March 30, 2018Date of Patent: January 14, 2020Assignee: MAN Truck & Bus AGInventors: Steffen Hirschmann, Thomas Malischewski, Andreas Sommermann, Jürgen Ritter
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Publication number: 20190338685Abstract: The disclosure relates to a variable valve drive, in particular with a sliding cam system, for an internal combustion engine. The variable valve drive has a cam carrier which has a first and second cam and a first, second, and third engagement track. A first actuator is designed to engage into the first engagement track in order to displace the cam carrier in a first axial direction. A second actuator is designed to engage into the second engagement track in order to displace the cam carrier in a second axial direction which is opposite to the first axial direction, and to engage into the third engagement track in order to displace the cam carrier in the first axial direction. The variable valve drive can have the advantage that, even in the event of a failure of the first actuator, a displacement of the cam carrier that is normally effected by means of the first actuator is possible by means of the second actuator.Type: ApplicationFiled: May 2, 2019Publication date: November 7, 2019Inventors: Steffen Hirschmann, Thomas Malischewski
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Publication number: 20190338681Abstract: The present disclosure relates to a variable valve drive, in particular with a sliding cam system, for an internal combustion engine. The variable valve drive has a shaft and a cam carrier which is arranged rotationally conjointly and axially displaceably on the shaft and which has a first cam and a second cam. The variable valve drive has an actuator device for axially displacing the cam carrier, and has a carrying device which at least partially engages around a lever axle of a force transmission device and carries the actuator device. The variable valve drive can offer the advantage that an arrangement of the actuator device which is expedient in terms of structural space is made possible in the region of the lever axle. At the same time, support of the actuator device by means of the carrying device on the lever axle can stiffen the flexible lever axle by means of the engaging-around configuration.Type: ApplicationFiled: May 2, 2019Publication date: November 7, 2019Inventor: Steffen Hirschmann
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Publication number: 20190277166Abstract: A variable drive for an internal combustion engine with a first gas exchange valve, in particular outlet valve, and a second gas exchange valve, in particular outlet valve. The variable valve drive has a sliding cam system. The sliding cam system has an axially displaceable cam carrier which, for the first gas exchange valve, has only two cams, namely a first cam and a second cam offset axially with respect thereto, and, for the second gas exchange valve, has only two cams, namely a third cam and a fourth cam offset axially with respect thereto. The first cam, the second cam, the third cam and the fourth cam differ from a zero lift cam. The first cam and the third cam are identical in design. The second cam and the fourth cam differ in design.Type: ApplicationFiled: March 1, 2019Publication date: September 12, 2019Inventors: Thomas Malischewski, Steffen Hirschmann, Dominic Hyna