G01L 23/221
For detecting or indicating knocks in internal combustion engines
Official title: {for detecting or indicating knocks in internal combustion engines}
G01L23/221 (For detecting or indicating knocks in internal combustion engines) appears on 791 US grants and 443 published applications in this corpus.
Search patents in G01L- Granted patents
- 791
- Published applications
- 443
- Assignees
- 211
- Inventors
- 1,305
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 21 | 0 |
| 1982 | 26 | 0 |
| 1983 | 29 | 0 |
| 1984 | 41 | 0 |
| 1985 | 16 | 0 |
| 1986 | 16 | 0 |
| 1987 | 17 | 0 |
| 1988 | 9 | 0 |
| 1989 | 9 | 0 |
| 1990 | 16 | 0 |
| 1991 | 12 | 0 |
| 1992 | 15 | 0 |
| 1993 | 19 | 0 |
| 1994 | 17 | 0 |
| 1995 | 17 | 0 |
| 1996 | 12 | 0 |
| 1997 | 10 | 0 |
| 1998 | 22 | 0 |
| 1999 | 17 | 0 |
| 2000 | 12 | 0 |
| 2001 | 18 | 11 |
| 2002 | 17 | 14 |
| 2003 | 19 | 16 |
| 2004 | 24 | 36 |
| 2005 | 23 | 20 |
| 2006 | 23 | 28 |
| 2007 | 24 | 27 |
| 2008 | 18 | 32 |
| 2009 | 22 | 40 |
| 2010 | 29 | 27 |
| 2011 | 18 | 19 |
| 2012 | 21 | 12 |
| 2013 | 15 | 21 |
| 2014 | 13 | 10 |
| 2015 | 13 | 17 |
| 2016 | 16 | 30 |
| 2017 | 18 | 14 |
| 2018 | 21 | 12 |
| 2019 | 16 | 13 |
| 2020 | 17 | 19 |
| 2021 | 19 | 13 |
| 2022 | 12 | 4 |
| 2023 | 2 | 3 |
| 2024 | 2 | 1 |
| 2025 | 1 | 2 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods for adaptively managing engine knocking23 Jun 2026US 12,662,984 B2Caterpillar Inc.
- Sensor for measuring seating force of engine intake and exhaust valve and measuring method8 Jul 2025US 12,352,638 B2Harbin Engineering University
- Method for the robust identification of knocking in an internal combustion engine, control device, and motor vehicle24 Sep 2024US 12,098,685 B2Bayerische Motoren Werke Aktiengesellschaft
- Knocking determination device and knocking control device9 Jul 2024US 12,033,444 B2Denso Corporation
- System and method for determining the timing of an engine event19 Sep 2023US 11,761,398 B2Ai Alpine US Bidco Inc
- Knock detection method, knock detection device, gas engine13 Aug 2026US 2026/0235473 A1Caterpillar Energy Solutions GmbH
- Systems and methods for adaptively managing engine knocking5 Mar 2026US 2026/0063099 A1Caterpillar Inc.
- Engine-knocking determining device and method15 May 2025US 2025/0155322 A1Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.
- Method and Control Unit for Detecting Abnormal Combustion, in particular Combustion Knock, in a least One Cylinder of an Internal Combustion Engine16 Jan 2025US 2025/0020544 A1Caterpillar Energy Solutions GmbH
- Gaseous fuel ignition quality tester, method for determining fuel ignition quality3 Oct 2024US 2024/0328884 A1Uchicago Argonne, LLC
Most cited
By later US patents
- Optoelectronic measuring device111US 6,649,924 B1AVL List GmbH · 2003
- 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
- Self-diagnosing apparatus and method for determining occurence of failure in inner cylinder pressure responsive sensor applicable to engine combustion detecting/controlling system94US 5,469,735 AUnisia Jecs Corporation · 1995
- Tuned vibration detector93US 4,479,389 AAllied Corporation · 1984
- Control device for an automobile89US 5,361,213 AHitachi, Ltd. · 1994