Internal combustion engine arrangement
US-2021054792-A1 · Feb 25, 2021 · US
Air-fuel ratio control in a diesel engine
Air-fuel ratio control in a diesel engine · 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 | F02D2250/32 |
| Official title | Air-fuel ratio control in a diesel engine |
| Display label | Air-fuel ratio control in a diesel engine |
| Total patents | 66 |
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 | 12 |
| 2016 | 16 |
| 2017 | 16 |
| 2018 | 11 |
| 2019 | 4 |
| 2021 | 1 |
| 2022 | 3 |
| 2023 | 2 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Control device for internal combustion engine
US-10400690-B2 · Sep 3, 2019 · US
Method for managing temperatures in aftertreatment system
US-10378405-B2 · Aug 13, 2019 · US
Device of predicting pressure of diesel engine and pressure predicting method using the same
US-10184418-B2 · Jan 22, 2019 · US
Control device for internal combustion engine
US-10174695-B2 · Jan 8, 2019 · US
Dual-fuel internal combustion engine
US-2018355816-A1 · Dec 13, 2018 · US
Stoichiometric High-Temperature Direct-Injection Compression-Ignition Engine
US-2018306098-A1 · Oct 25, 2018 · US
Multicylinder engine
US-10072602-B2 · Sep 11, 2018 · US
Control device for internal combustion engine
US-2018202377-A1 · Jul 19, 2018 · US
Fuel control systems and methods for delay compensation
US-9995236-B2 · Jun 12, 2018 · US
Methods and systems for estimating an air-fuel ratio with a variable voltage oxygen sensor
US-9926871-B2 · Mar 27, 2018 · US
Stoichiometric high-temperature direct-injection compression-ignition engine
US-9903262-B2 · Feb 27, 2018 · US
Device of predicting pressure of diesel engine and pressure predicting method using the same
US-2018023505-A1 · Jan 25, 2018 · US
Methods and systems for estimating an air-fuel ratio with a variable voltage oxygen sensor
US-9863353-B2 · Jan 9, 2018 · US
Exhaust purification system of internal combustion engine
US-9863354-B2 · Jan 9, 2018 · US
System and method for determining an oil contamination level of an engine based on a switching period of a valve lift actuator to improve engine startups
US-9863332-B2 · Jan 9, 2018 · US
Exhaust gas control device for internal combustion engine and control method thereof
US-2017284269-A1 · Oct 5, 2017 · US
Automobile with fuel injection controller
US-9759150-B2 · Sep 12, 2017 · US
Method and system for determining air-fuel ratio imbalance via engine torque
US-9759148-B2 · Sep 12, 2017 · US
Limiting nox emissions using two catalysts
US-2017254240-A1 · Sep 7, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F02D2250/32?
- CPC F02D2250/32 is the Cooperative Patent Classification code for “Air-fuel ratio control in a diesel engine.”
- How many patents are filed under CPC F02D2250/32 (Air-fuel ratio control in a diesel engine)?
- Our database includes 66 publications tagged with this CPC code.
- Is patent activity under CPC F02D2250/32 growing?
- Publication counts under this code: 2 in 2023 vs 1 in 2025 (latest complete years).