Method and device for knock recognition of an internal combustion engine
US-10508963-B2 · Dec 17, 2019 · US
for detecting or indicating knocks in internal combustion engines
for detecting or indicating knocks in internal combustion engines · Cooperative Patent Classification (CPC)
Computing, optics, measurement, and control technologies.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | G01L23/221 |
| Official title | {for detecting or indicating knocks in internal combustion engines} |
| Display label | for detecting or indicating knocks in internal combustion engines |
| Total patents | 115 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 22 |
| 2017 | 13 |
| 2018 | 14 |
| 2019 | 11 |
| 2020 | 19 |
| 2021 | 16 |
| 2022 | 9 |
| 2023 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Engine knocking detection apparatus
US-10344696-B2 · Jul 9, 2019 · US
Method and system for knock sensor diagnostic
US-10156220-B1 · Dec 18, 2018 · US
Method for detecting the anti-knocking capacity of a fuel in an internal combustion engine
US-10125736-B2 · Nov 13, 2018 · US
Intake air temperature control device for engine
US-2018320642-A1 · Nov 8, 2018 · US
Knocking determination device and knocking control device for internal combustion engine
US-10082093-B2 · Sep 25, 2018 · US
Engine knocking detection apparatus
US-2018238256-A1 · Aug 23, 2018 · US
Systems and methods for estimating a time of an engine event
US-10054043-B2 · Aug 21, 2018 · US
Method for operating an internal combustion engine
US-2018209394-A1 · Jul 26, 2018 · US
Method and system to determine location of peak firing pressure
US-10001077-B2 · Jun 19, 2018 · US
Method and system for detecting and eliminating knocking
US-9970373-B1 · May 15, 2018 · US
Method and device for knock recognition of an internal combustion engine
US-2018087994-A1 · Mar 29, 2018 · US
Methods and systems to derive health of mating cylinder using knock sensors
US-9915217-B2 · Mar 13, 2018 · US
Control Device for Internal Combustion Engine and Abnormal Combustion Detecting Method
US-2018066593-A1 · Mar 8, 2018 · US
Method for determining and applying an engine misfire threshold
US-2018058358-A1 · Mar 1, 2018 · US
System and method for detecting operating events of an engine
US-9874488-B2 · Jan 23, 2018 · US
Device and method for determining knock in an internal combustion engine
US-9835514-B2 · Dec 5, 2017 · US
Knock determination apparatus for internal combustion engine
US-9816446-B2 · Nov 14, 2017 · US
System and method for detecting reciprocating device abnormalities utilizing standard quality control techniques
US-9803567-B2 · Oct 31, 2017 · US
Systems and methods for detection of engine component conditions via external sensors
US-9784635-B2 · Oct 10, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC G01L23/221?
- CPC G01L23/221 is the Cooperative Patent Classification code for “for detecting or indicating knocks in internal combustion engines.”
- How many patents are filed under CPC G01L23/221 (for detecting or indicating knocks in internal combustion engines)?
- Our database includes 115 publications tagged with this CPC code.
- Is patent activity under CPC G01L23/221 growing?
- Publication counts under this code: 1 in 2023 vs 1 in 2025 (latest complete years).