Control method and control device for hybrid vehicle
US-12065127-B2 · Aug 20, 2024 · US
Changing of compression ratio
Changing of compression ratio · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F01B31/14 |
| Official title | Changing of compression ratio |
| Display label | Changing of compression ratio |
| Total patents | 44 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 5 |
| 2017 | 2 |
| 2018 | 10 |
| 2019 | 10 |
| 2020 | 7 |
| 2021 | 6 |
| 2022 | 2 |
| 2023 | 1 |
| 2024 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Internal combustion engine system
US-11598248-B2 · Mar 7, 2023 · US
Method and system for diagnosing and/or controlling a reciprocating engine having a variable compression ratio
US-11421587-B2 · Aug 23, 2022 · US
Internal combustion engine system
US-2022154652-A1 · May 19, 2022 · US
Variable compression device and engine system
US-11162440-B2 · Nov 2, 2021 · US
Length-adjustable connecting rod with control device
US-11066988-B2 · Jul 20, 2021 · US
Control method and control device for hybrid vehicle
US-2021206366-A1 · Jul 8, 2021 · US
Dual-crankshaft, opposed-piston engine with mechanically uncoupled crankshafts
US-2021123389-A1 · Apr 29, 2021 · US
Actuator for variable compression ratio mechanism of internal combustion engine
US-2021071570-A1 · Mar 11, 2021 · US
Method for variable compression ratio engine
US-10935462-B2 · Mar 2, 2021 · US
Variable compression device and engine system
US-2020400082-A1 · Dec 24, 2020 · US
Variable operation system for internal combustion engine, and control device therefor
US-2020232325-A1 · Jul 23, 2020 · US
Length-adjustable connecting rod having stop surfaces
US-2020217246-A1 · Jul 9, 2020 · US
Variable compression ratio engine
US-2020182146-A1 · Jun 11, 2020 · US
Switch valve for controlling a hydraulic fluid flow and connecting rod for a variable compression internal combustion engine with a switch valve
US-10677155-B2 · Jun 9, 2020 · US
Variable compression ratio engine
US-10669929-B1 · Jun 2, 2020 · US
Length-adjustable connecting rod with control device
US-2020131985-A1 · Apr 30, 2020 · US
Actuator of link mechanism for internal combustion engine
US-10480402-B2 · Nov 19, 2019 · US
Free piston device
US-10472995-B2 · Nov 12, 2019 · US
System and method for variable compression ratio engine
US-2019331553-A1 · Oct 31, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01B31/14?
- CPC F01B31/14 is the Cooperative Patent Classification code for “Changing of compression ratio.”
- How many patents are filed under CPC F01B31/14 (Changing of compression ratio)?
- Our database includes 44 publications tagged with this CPC code.
- Is patent activity under CPC F01B31/14 growing?
- Publication counts under this code: 1 in 2023 vs 1 in 2024 (latest complete years).