F02D 41/1495
Detection of abnormalities in the air/fuel ratio feedback system
Official title: {Detection of abnormalities in the air/fuel ratio feedback system}
F02D41/1495 (Detection of abnormalities in the air/fuel ratio feedback system) appears on 716 US grants and 550 published applications in this corpus.
Search patents in F02D- Granted patents
- 716
- Published applications
- 550
- Assignees
- 130
- Inventors
- 1,260
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 4 | 0 |
| 1988 | 8 | 0 |
| 1989 | 6 | 0 |
| 1990 | 7 | 0 |
| 1991 | 8 | 0 |
| 1992 | 6 | 0 |
| 1993 | 19 | 0 |
| 1994 | 17 | 0 |
| 1995 | 18 | 0 |
| 1996 | 15 | 0 |
| 1997 | 16 | 0 |
| 1998 | 20 | 0 |
| 1999 | 17 | 0 |
| 2000 | 14 | 0 |
| 2001 | 11 | 7 |
| 2002 | 17 | 15 |
| 2003 | 14 | 29 |
| 2004 | 23 | 21 |
| 2005 | 22 | 21 |
| 2006 | 14 | 20 |
| 2007 | 22 | 22 |
| 2008 | 10 | 21 |
| 2009 | 24 | 26 |
| 2010 | 17 | 32 |
| 2011 | 16 | 21 |
| 2012 | 25 | 24 |
| 2013 | 20 | 31 |
| 2014 | 23 | 28 |
| 2015 | 32 | 39 |
| 2016 | 31 | 41 |
| 2017 | 31 | 29 |
| 2018 | 41 | 35 |
| 2019 | 36 | 18 |
| 2020 | 30 | 15 |
| 2021 | 23 | 14 |
| 2022 | 9 | 4 |
| 2023 | 7 | 9 |
| 2024 | 11 | 16 |
| 2025 | 15 | 3 |
| 2026 | 1 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for adaptive control of ammonia-NOx ratio28 Jul 2026US 12,692,810 B2Caterpillar Inc.
- Method, system and computer program product for performing an on-board diagnostic function in a motor vehicle23 Dec 2025US 12,503,126 B2Dr. Ing. h,c.F. Porsche Aktiengesellschaft
- Whole vehicle fault detection using centrally located gas analysis2 Dec 2025US 12,487,151 B2TORC Robotics, Inc.
- Systems and methods for diagnosing component failure18 Nov 2025US 12,473,853 B2Cummins Inc.
- Individual throttle-type or unequal interval combustion-type multi-cylinder engine unit21 Oct 2025US 12,448,930 B2Yamaha Hatsudoki Kabushiki Kaisha
- Method for operating a drive device for a motor vehicle and corresponding drive device27 Aug 2026US 2026/0251101 A1Audi AG
- System and method for adaptive control of ammonia-nox ratio18 Jun 2026US 2026/0168418 A1Caterpillar Inc.
- Methods and systems for diagnosing four oxygen sensor system18 Jun 2026US 2026/0168456 A1Ford Global Technologies, LLC
- Engine catalyst diagnosis apparatus11 Jun 2026US 2026/0160194 A1Mazda Motor Corporation
- Systems and methods for diagnosing component failure28 May 2026US 2026/0146555 A1Cummins Inc.
Most cited
By later US patents
- Apparatus and method for diagnosing degradation or malfunction of oxygen sensor108US 5,781,878 ANippondenso Co., Ltd. · 1998
- Engine and emission monitoring and control system utilizing gas sensors96US 5,426,934 AHitachi America, Ltd. · 1995
- Air-fuel ratio control system for internal combustion engines81US 5,724,808 AHonda Giken Kogyo Kabushiki Kaisha · 1998
- Method for air-fuel ratio sensor diagnosis63US 6,736,121 B2Ford Global Technologies, LLC · 2004
- Combustible-gas sensor, diagnostic device for intake-oxygen concentration sensor, and air-fuel ratio control device for internal combustion engines63US 6,739,177 B2Nippon Soken, Inc. · 2004