F02D 15/02
Varying compression ratio: by alteration or displacement of piston stroke
Official title: by alteration or displacement of piston stroke
F02D15/02 (Varying compression ratio: by alteration or displacement of piston stroke) appears on 372 US grants and 404 published applications in this corpus.
Search patents in F02D- Granted patents
- 372
- Published applications
- 404
- Assignees
- 90
- Inventors
- 606
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 4 |
| 2003 | 14 | 14 |
| 2004 | 8 | 9 |
| 2005 | 6 | 7 |
| 2006 | 5 | 8 |
| 2007 | 13 | 10 |
| 2008 | 9 | 13 |
| 2009 | 7 | 11 |
| 2010 | 11 | 22 |
| 2011 | 6 | 11 |
| 2012 | 11 | 10 |
| 2013 | 13 | 10 |
| 2014 | 13 | 15 |
| 2015 | 7 | 30 |
| 2016 | 21 | 20 |
| 2017 | 17 | 32 |
| 2018 | 29 | 50 |
| 2019 | 50 | 42 |
| 2020 | 40 | 46 |
| 2021 | 40 | 18 |
| 2022 | 17 | 11 |
| 2023 | 10 | 5 |
| 2024 | 3 | 4 |
| 2025 | 3 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Work vehicle power system with dynamic auto-ignition assistance compression ratios17 Feb 2026US 12,553,395 B2Deere & Company
- Variable displacement engine29 Jul 2025US 12,372,035 B2
- Variable compression ratio device15 Jul 2025US 12,359,629 B2
- Control device for variable compression ratio mechanism, and diagnostic method for same13 May 2025US 12,297,784 B2Hitachi Astemo, Ltd.
- Adaptive any-fuel camless reciprocating engine24 Dec 2024US 12,173,664 B2The Regents of the University of California
- Continuously Variable Displacement and Variable Compression Ratio Mechanism and an Engine Provided with the Same16 Apr 2026US 2026/0104005 A1Hyundai Motor Company
- Variable compression ratio device16 Oct 2025US 2025/0320836 A1
- Variable displacement engine19 Sep 2024US 2024/0309820 A1
- Work vehicle power system with dynamic auto-ignition assistance compression ratios27 Jun 2024US 2024/0209805 A1Deere & Company
- Control Device for Variable Compression Ratio Mechanism, and Diagnostic Method for Same9 May 2024US 2024/0151187 A1Hitachi Astemo, Ltd.
Most cited
By later US patents
- Method and operation of an engine72US 7,431,024 B2Polaris Industries Inc. · 2008
- Variable compression ratio apparatus for internal combustion engine44US 5,146,879 AMitsubishi Jidosha Kogyo Kabushiki Kaisha · 1992
- Engine knock prevention system and method42US 6,553,949 B1Ford Global Technologies, LLC · 2003
- Variable compression ratio systems for opposed-piston and other internal combustion engines, and related methods of manufacture and use40US 8,413,619 B2Pinnacle Engines, Inc. · 2013
- Device for changing compression of a reciprocating piston internal combustion engine39US 5,960,750 AMeta Motoren-und Energie-Technik GmbH · 1999