System and method for actuating engine valves including a recompression relief valve event

Patent metadata

Field	Value
Publication number	US-2025116213-A1
Application number	US-202418906834-A
Country	US
Kind code	A1
Filing date	Oct 4, 2024
Priority date	Oct 4, 2023
Publication date	Apr 10, 2025
Grant date	—

Abstract

A valve actuation system for actuating at least one of two or more engine valves in an internal combustion engine comprises at least one motion source including a first motion source configured to provide an exhaust main valve event. A valve train for conveying valve events from the at least one motion source to the two or more engine valves comprises a lost motion component for selectively conveying valve events to the at least one of the two or more engine valves. A phasing assembly is configured to advance a phase of at least the first motion source and the exhaust main valve event. The at least one motion source is configured to provide a recompression relief valve event to the at least one of the two or more engine valves when the phase of the exhaust main valve event is advanced.

First claim

1 . A system for actuating two or more engine valves in an internal combustion engine, the system comprising:
at least one motion source configured to provide a plurality of valve events, the at least one motion source including a first motion source configured to provide an exhaust main valve event of the plurality of valve events; and a valve train configured to convey the plurality of valve events from the at least one motion source to the two or more engine valves, the valve train comprising a lost motion component configured to selectively convey at least one valve event of the plurality of valve events from the at least one motion source to at least a first engine valve of the two or more engine valves; a phasing assembly configured to selectively advance a phase of at least the first motion source so as to advance a phase of the exhaust main valve event, wherein the at least one motion source is configured to provide a recompression relief valve event to at least the first engine valve via the valve train and the at least one lost motion component when the phase of the exhaust main valve event is advanced.

2 . The system of claim 1 , wherein the recompression relief valve event is configured to overlap with an intake main valve event.

3 . The system of claim 1 , wherein the at least one motion source further includes a second motion source configured to provide the recompression relief valve event.

4 . The system of claim 3 , wherein the phasing assembly is further configured to selectively advance a phase of the second motion source so as to advance a phase of the recompression relief valve event.

5 . The system of claim 3 , wherein the second motion source is further configured to provide an auxiliary valve event of the plurality of valve events.

6 . The system of claim 3 , wherein the at least one motion source further includes a third motion source configured to provide an auxiliary valve event of the plurality of valve events.

7 . The system of claim 1 , wherein the first motion source is further configured to provide the recompression relief valve event.

8 . The system of claim 7 , wherein the at least one motion source further includes a second motion source configured to provide an auxiliary valve event of the plurality of valve events.

9 . The system of claim 8 , wherein the phasing assembly is further configured to advance a phase of the second motion source so as to advance a phase of the auxiliary valve event.

10 . The system of claim 7 , wherein the first motion source is further configured to provide an auxiliary valve event of the plurality of valve events.

11 . A method for actuating two or more engine valves in an internal combustion engine, the method comprising:
providing a plurality of valve events via at least one motion source; providing an exhaust main valve event of the plurality of valve events via a first motion source of the at least one motion source; conveying the plurality of valve events from the at least one motion source to the two or more engine valves via a valve train; selectively conveying at least one valve event of the plurality of valve events from the at least one motion source through a lost motion component of the valve train to at least a first engine valve of the two or more engine valves; and selectively advancing a phase of at least the first motion source so as to advance a phase of the exhaust main valve event via a phasing assembly, wherein the plurality of valve events includes a recompression relief valve event conveyed to at least the first engine valve when the phase of the exhaust main valve event is advanced.

Assignees

• Jacobs Vehicle Systems Inc

Inventors

• Roberts Gabriel S
• Mandell John
• Benner Thomas

Classifications

• F02D13/0249

  changing the valve timing only · CPC title

• F02D13/0207

  changing valve lift or valve lift and timing · CPC title

• F01L1/3442

  using hydraulic chambers with variable volume to transmit the rotating force · CPC title

• F01L1/344

  changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear · CPC title

• F01L13/08

  for decompression, e.g. during starting; for changing compression ratio · CPC title