F02D 41/1498
Measuring engine roughness
Official title: {measuring engine roughness}
F02D41/1498 (Measuring engine roughness) appears on 1,002 US grants and 762 published applications in this corpus.
Search patents in F02D- Granted patents
- 1,002
- Published applications
- 762
- Assignees
- 217
- Inventors
- 1,949
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 5 | 0 |
| 1978 | 5 | 0 |
| 1979 | 8 | 0 |
| 1980 | 7 | 0 |
| 1981 | 2 | 0 |
| 1982 | 5 | 0 |
| 1983 | 7 | 0 |
| 1984 | 4 | 0 |
| 1985 | 13 | 0 |
| 1986 | 8 | 0 |
| 1987 | 10 | 0 |
| 1988 | 7 | 0 |
| 1989 | 11 | 0 |
| 1990 | 14 | 0 |
| 1991 | 14 | 0 |
| 1992 | 12 | 0 |
| 1993 | 9 | 0 |
| 1994 | 7 | 0 |
| 1995 | 7 | 0 |
| 1996 | 7 | 0 |
| 1997 | 12 | 0 |
| 1998 | 20 | 0 |
| 1999 | 38 | 0 |
| 2000 | 25 | 0 |
| 2001 | 24 | 6 |
| 2002 | 27 | 29 |
| 2003 | 31 | 30 |
| 2004 | 27 | 16 |
| 2005 | 23 | 36 |
| 2006 | 32 | 19 |
| 2007 | 25 | 33 |
| 2008 | 17 | 26 |
| 2009 | 16 | 38 |
| 2010 | 29 | 31 |
| 2011 | 24 | 26 |
| 2012 | 25 | 28 |
| 2013 | 35 | 34 |
| 2014 | 18 | 22 |
| 2015 | 27 | 43 |
| 2016 | 29 | 34 |
| 2017 | 28 | 44 |
| 2018 | 38 | 50 |
| 2019 | 58 | 39 |
| 2020 | 43 | 35 |
| 2021 | 42 | 37 |
| 2022 | 49 | 44 |
| 2023 | 32 | 20 |
| 2024 | 17 | 17 |
| 2025 | 17 | 17 |
| 2026 | 11 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Combustion abnormality monitoring device for two-stroke engine16 Jun 2026US 12,655,809 B2Kawasaki Motors, Ltd.
- Split cycle engine2 Jun 2026US 12,644,406 B2Fpt Industrial S.P.A.
- System and a method for reducing hydrogen knocking in a hydrogen internal combustion engine2 Jun 2026US 12,644,424 B1United Arab Emirates University
- Knocking prediction method, knocking prediction device, engine control device, vehicle, combustion device design method, power generation device design method, vehicle design method, and fuel design method1 Oct 2026US 2026/0298168 A1Tohoku University
- Mixed-combustion electronic control device6 Aug 2026US 2026/0226867 A1Hitachi, Ltd.
- Engine anomaly detection and mitigation systems11 Jun 2026US 2026/0160203 A1
- Hydrogen mixed-combustion electronic control device and power generation system using same11 Jun 2026US 2026/0160211 A1Hitachi, Ltd.
- Methods and systems for modulating engine air-fuel ratio during cylinder imbalance diagnostic28 May 2026US 2026/0146573 A1Ford Global Technologies, LLC
Most cited
By later US patents
- Compensation circuit for an automotive ignition sensing system165US 6,392,315 B1Delphi Technologies, Inc. · 2002
- Method for engine control136US 5,445,128 ADetroit Diesel Corporation · 1995
- Method of avoiding abnormal combination in an internal combination engine and an arrangement for carrying out the method98US 4,372,119 ASaab-Scania Aktiebolag · 1983
- Internal combustion engine94US 4,172,434 A1979
- Method and system for detecting the misfire of an internal combustion engine utilizing engine torque nonuniformity93US 5,278,760 AHitachi America, Ltd. · 1994