公开(公告)号：US20240247626A1

公开(公告)日：2024-07-25

申请号：US18412001

申请日：2024-01-12

申请人： Northwest ULD, Inc. (DBA Northwest UAV)

发明人： Chris Harris ,  Greg Stadeli

IPC分类号： F02M37/00 ,  F02B61/04 ,  F02B75/02 ,  F02M61/14

CPC分类号： F02M37/0047 ,  F02B61/04 ,  F02B75/02 ,  F02M61/14 ,  F02B2075/025

摘要： A crankcase for a UAV internal combustion engine, comprising a crankcase housing comprising a crankcase chamber, a fuel injection port extending through said crankcase housing to said crankcase chamber, and a fuel diverter comprising a diverting surface disposed within said crankcase chamber and aligned with said fuel injection port.

公开(公告)号：US11952937B2

公开(公告)日：2024-04-09

申请号：US18334193

申请日：2023-06-13

申请人： Andreas Stihl AG & Co. KG

发明人： Michael Grether ,  Robert Koehli ,  Richard Wirt ,  Bernd Engel

IPC分类号： F02B25/00 ,  F02B33/02 ,  F02B75/02

CPC分类号： F02B33/02 ,  F02B75/02 ,  F02B2075/025

摘要： A two-stroke engine possesses a cylinder, in the cylinder bore of which a combustion chamber is formed. The combustion chamber is bounded by a reciprocating piston, which drives a crankshaft rotatably mounted in a crankcase. A crankcase interior is fluidically connected to the combustion chamber across at least one transfer channel in at least one position of the piston. The at least one transfer channel emerges with a discharge opening in the crankcase interior and with at least one transfer window on the cylinder bore. It is proposed that all transfer channels have an average length as measured from the discharge opening to the transfer window, the average length being at least 1.5 in relation to the stroke, and that the volume of the crankcase interior including all transfer channels is at most 3.1 in relation to the piston displacement.

公开(公告)号：US20240052793A1

公开(公告)日：2024-02-15

申请号：US18234036

申请日：2023-08-15

申请人： Alpha-Otto Technologies Inc.

发明人： John Krzeminski

IPC分类号： F02D13/02 ,  F01L7/00 ,  F02B37/16 ,  F02M61/14 ,  F02D41/00

CPC分类号： F02D13/0284 ,  F01L7/00 ,  F02B37/16 ,  F02M61/145 ,  F02D13/0249 ,  F02D41/009 ,  F02D2200/101 ,  F02B2075/025

摘要： An engine system and method of operation therefor are provided. The system is a two-stroke internal combustion engine having an exhaust valve assembly that controls the exhaust cycle relative to crankshaft timing. The exhaust valve assembly is positioned between exhaust port and an exhaust pipe. The exhaust valve assembly comprises a rotary exhaust valve and valve phasing assembly. The rotary exhaust valve comprises a valve body defining a valve void therethrough. The use of the rotary exhaust valve allows for alteration or calibration of the fixed time and location at which the intake port and exhaust port are opened and closed by the piston with respect to the respective engine cycle. Notably, while still uncovered by the piston, the exhaust port may be closed due to full misalignment of the valve void and the exhaust port, while the intake port remains open, allowing for cylinder charging.

公开(公告)号：US11891930B2

公开(公告)日：2024-02-06

申请号：US17552856

申请日：2021-12-16

申请人： BRP-ROTAX GMBH & CO. KG

发明人： Nigel Foxhall ,  Markus Doppelbauer ,  Heinz Kusel ,  Matthias Zarhuber ,  Roland Kirchberger ,  Franz Winkler ,  Andrea Abis

IPC分类号： F01M13/00 ,  F01L7/12 ,  F01L7/16 ,  F02B75/02

CPC分类号： F01M13/0011 ,  F01L7/12 ,  F01L7/16 ,  F01M2013/0044 ,  F02B2075/025

摘要： A method of operating an exhaust valve of a two-stroke internal combustion engine is disclosed. The engine has a cylinder and a piston movably disposed within the cylinder. The cylinder defines at least one exhaust port for discharging exhaust fluid from the cylinder. The exhaust valve is configured to cyclically obstruct the exhaust port. The method includes: rotating the exhaust valve in a first direction for clearing the exhaust port before the piston uncovers the exhaust port during a downstroke of the piston, the first direction being opposite a direction of rotation of a crankshaft of the engine; and rotating the exhaust valve in the first direction for at least partially closing the exhaust port before the piston fully covers the exhaust port during an upstroke of the piston, said rotating of the exhaust valve relative to the rotation of the crankshaft at least partially counterbalancing the crankshaft.

公开(公告)号：US11879381B2

公开(公告)日：2024-01-23

申请号：US17619639

申请日：2020-06-15

申请人： HUSQVARNA AB

发明人： Markus Hedberg ,  Niklas Enander ,  Tobias Stalfors

IPC分类号： F02B25/00 ,  F02B63/02 ,  F02B25/22 ,  F02B33/04 ,  F02B75/02

CPC分类号： F02B63/02 ,  F02B25/22 ,  F02B33/04 ,  F02B2075/025

摘要： A two-stroke engine (1) is disclosed comprising a cylinder (2), a piston (3) arranged to reciprocate in the cylinder (2), a crankcase (5), a fuel injector (7) configured to inject fuel into the crankcase (5), an air inlet (9) connected to the crankcase (5), and a stratified scavenging intake (11) connected to the cylinder (2). The engine (1) comprises a throttle (13) configured to control the amount of air supplied to the air inlet (9) and to the stratified scavenging intake (11). The present disclosure further relates to handheld power tool (50) comprising an engine (1).

公开(公告)号：US11852115B2

公开(公告)日：2023-12-26

申请号：US17361613

申请日：2021-06-29

申请人： Arctic Cat Inc.

发明人： Alexander Konrad Fuhrman ,  Micheal Kevin Schley

IPC分类号： F02P5/04 ,  F02B75/02 ,  F02D41/38 ,  F02P5/15

CPC分类号： F02P5/045 ,  F02B75/02 ,  F02D41/38 ,  F02P5/1502 ,  F02B2075/025 ,  F02D2200/101 ,  F02D2200/70

摘要： Embodiments describe a method of controlling a two-stroke internal combustion engine. A method of controlling a two-stroke internal combustion engine includes determining a base nominal exhaust gas temperature, determining a base barometric pressure correction to base nominal exhaust gas temperature, determining exhaust gas temperature differential, determining exhaust gas temperature injection correction, and utilizing the exhaust gas temperature injection correction to make a final short-term fuel or ignition correction.

公开(公告)号：US11828221B2

公开(公告)日：2023-11-28

申请号：US18080769

申请日：2022-12-14

申请人： YAMABIKO CORPORATION

发明人： Takahiro Yamazaki ,  Ken Shirai ,  Hisato Onodera ,  Koichirou Ogura

IPC分类号： F02B25/14 ,  F02B17/00 ,  F02B75/02 ,  F02F1/22

CPC分类号： F02B25/14 ,  F02B17/00 ,  F02B75/02 ,  F02F1/22 ,  F02B2075/025

摘要： A Schnuerle scavenging two-stroke engine is provided that can keep combustion stability in a wide rotation speed range while suppressing blow-by. The engine of the present invention is a Schnuerle scavenging two-stroke engine (2). A scavenging passage (14(in1)) related to at least one scavenging port (16(in1)) has, at its upper end portion (14a(in1)), an intake-side wall surface (204). The intake-side wall surface (204) defines a first flow direction (42) of scavenging gas discharged from the scavenging port (16(in1)) at a height level of the scavenging port (16(in1)). The upper end portion (14a(in1)) of the scavenging passage (14(in1)) related to the scavenging port (16(in1)) has a guide portion (50) defining a second flow direction (44) of scavenging gas discharged from the scavenging port (16(in1)). The second flow direction (44) is deflected to the intake side from the first flow direction (42) at the height level of the scavenging port (16(in1)).

公开(公告)号：US11815037B2

公开(公告)日：2023-11-14

申请号：US17870028

申请日：2022-07-21

申请人： Polaris Industries Inc.

发明人： James H. Buchwitz ,  Lucas R. Salfer ,  G. Jay McKoskey ,  Jacob Hanson ,  Ron Danielson ,  Andreas H. Bilek ,  Dallas J. Blake ,  Ralph W. Lauzze, III ,  Eric L. Gausen

IPC分类号： F02D19/02 ,  F02M59/20 ,  F02B75/02 ,  F02D31/00

CPC分类号： F02D19/028 ,  F02B75/02 ,  F02D31/007 ,  F02M59/20 ,  F02B2075/025 ,  F02D2200/0625

摘要： A method and system for operating a two-stroke engine includes a fuel system comprising a fuel pressure sensor, fuel temperature sensor and a fuel injector and a controller in communication with the fuel pressure sensor and fuel temperature sensor. The controller controls the fuel injector with a fuel pulsewidth determined by determining a beginning time of a window for measuring fuel pressure, determining an ending time of the window, measuring fuel pressure between the beginning time and the ending time, determining a fuel pulsewidth based on the fuel pressure and fuel temperature and injecting fuel into the two-stroke engine in response to a desired fuel mass.

公开(公告)号：US20230349336A1

公开(公告)日：2023-11-02

申请号：US18346993

申请日：2023-07-05

申请人： Polaris Industries Inc.

发明人： Dallas J. BLAKE ,  James H. BUCHWITZ ,  Lucas R. SALFER

IPC分类号： F02D41/00 ,  B62J50/21 ,  F01N13/18 ,  F02B37/18 ,  F02D23/00 ,  F02D41/10

CPC分类号： F02D41/0007 ,  B62J50/21 ,  F01N13/1805 ,  F02B37/186 ,  F02D23/00 ,  F02D41/10 ,  F02D2200/101 ,  F02D2200/703 ,  F02B2075/025

摘要： A method and system for controlling operation of a two-stroke engine having a turbocharger includes the two-stroke engine comprising an electronically controlled exhaust valve. A throttle position sensor generates a throttle position signal corresponding to a position of a throttle plate of a throttle. A boost box is coupled to the two-stroke engine. A boost box pressure sensor is coupled to the boost box and generates a boost box pressure signal corresponding to a pressure within the boost box. A controller is coupled to the boost box pressure signal controlling a position of the electronically controlled exhaust valve in response to the boost box pressure signal and the throttle position signal.

公开(公告)号：US20230347895A1

公开(公告)日：2023-11-02

申请号：US17909520

申请日：2020-03-13

申请人： VOLVO TRUCK CORPORATION

发明人： Anders ERIKSSON ,  Claes KUYLENSTIERNA

IPC分类号： B60W30/18 ,  F02D41/02 ,  F02D13/04 ,  F02D13/02 ,  F02D41/12 ,  F02B75/02 ,  B60W10/06 ,  B60W10/10

CPC分类号： B60W30/18109 ,  F02D41/0215 ,  F02D13/04 ,  F02D13/0203 ,  F02D41/12 ,  F02B75/02 ,  F02D13/028 ,  B60W10/06 ,  B60W10/10 ,  F02D2200/101 ,  F02B2075/025 ,  F02B2075/027 ,  F02D2200/702 ,  F02D2200/50 ,  B60W2520/00 ,  B60W2552/15 ,  B60W2510/0638 ,  B60W2510/1005 ,  B60W2530/10

摘要： A method for controlling a powertrain of a vehicle, the powertrain comprising:



an engine comprising mutually independently operable valves, the engine being configured to be operated in a four-stroke operation mode, and
a drivetrain comprising a transmission,

the method comprising:

while operating the engine in the four-stroke operation mode, identifying that a critical situation applies or is expected to apply, in which a fast downshift of the transmission is required,
initiating a downshift process in response to the identification of the critical situation,
during at least a part of the downshift process, increasing an engine speed by controlling at least the mutually independently operable valves of the engine such that the engine is temporarily operated in a two-stroke operation mode.