F01L 9/40
Methods of operation thereof
Official title: Methods of operation thereof; Control of valve actuation, e.g. duration or lift
F01L9/40 (Methods of operation thereof) appears on 88 US grants and 77 published applications in this corpus.
Search patents in F01L- Granted patents
- 88
- Published applications
- 77
- Assignees
- 55
- Inventors
- 192
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 3 |
| 2002 | 6 | 6 |
| 2003 | 6 | 3 |
| 2004 | 2 | 4 |
| 2005 | 2 | 3 |
| 2006 | 4 | 5 |
| 2007 | 5 | 2 |
| 2008 | 2 | 1 |
| 2009 | 0 | 4 |
| 2010 | 3 | 1 |
| 2011 | 3 | 1 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 0 | 1 |
| 2015 | 2 | 3 |
| 2016 | 1 | 4 |
| 2017 | 4 | 2 |
| 2018 | 0 | 1 |
| 2019 | 3 | 2 |
| 2020 | 4 | 1 |
| 2021 | 2 | 9 |
| 2022 | 8 | 6 |
| 2023 | 8 | 6 |
| 2024 | 3 | 5 |
| 2025 | 6 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F01L 2009/4086Soft landingIndexing code28
- F01L 2009/408Engine startingIndexing code11
- F01L 2009/409Determination of valve speedIndexing code10
- F01L 2009/4098Relating to gap between armature shaft and valve stem endIndexing code9
- F01L 2009/4094Engine stoppingIndexing code5
- F01L 2009/4096Relating to sticking durationIndexing code5
- F01L 2009/4088Fail safeIndexing code3
- F01L 2009/4092Determination of valve timing during particular working conditionsIndexing code1
Recent patents
- Variable duration valve train9 Jun 2026US 12,650,087 B1
- Shutdown control of internal combustion engine comprising lost motion component4 Nov 2025US 12,460,594 B2Jacobs Vehicle Systems, Inc.
- Hydraulic valve actuation system with controlled valve seating velocity and method therefor2 Sep 2025US 12,404,787 B2ARA4 Consulting LLC
- Hydraulic drive for accelerating and braking components20 May 2025US 12,305,544 B2Empa EidgenöSsische MaterialprüFungs- Und Forschungsanstalt
- Anti-clatter engine brake and engine having same15 Apr 2025US 12,276,215 B1Deere & Company
- Apparatus comprising a plurality of tools each having at least one hydraulic chamber for hydraulic liquid29 Jan 2026US 2026/0028923 A1Freevalve AB
- Multi-cylinder internal combustion engine, with cylinders equipped with intake valve variable actuation systems having hydraulic circuits which cross each other16 Jan 2025US 2025/0020072 A1C. R. F. Societa Consortile per Azioni
- Hydraulic Valve Actuation System with Controlled Valve Seating Velocity and Method Therefor8 Aug 2024US 2024/0263573 A1ARA4 Consulting LLC
- Active method for cold start emissions reduction8 Aug 2024US 2024/0263597 A1Hyundai Motor Company
- System facilitating cylinder deactivation and 1.5-stroke engine braking operation in an internal combustion engine6 Jun 2024US 2024/0183291 A1Jacobs Vehicle Systems, Inc.
Most cited
By later US patents
- Electromagnetic actuator889US 6,366,441 B1Honda Giken Kogyo Kabushiki Kaisha · 2002
- System and method for servo control of nonlinear electromagnetic actuators139US 6,208,497 B1Venture Scientifics, LLC · 2001
- Sensorless method to determine the static armature position in an electronically controlled solenoid device50US 6,476,599 B1Siemens Automotive Corporation · 2002
- System for control of an electromagnetic actuator42US 6,249,418 B12001
- Solenoid cassette pump with servo controlled volume detection36US 6,942,469 B2Crystal Investments, Inc. · 2005