Methods and system for operating skipped cylinders to provide secondary air
US11391227B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2021 |
| Grant date | Jul 19, 2022 |
| Priority date | — |
| Expiry date | Apr 16, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/0802
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and systems are provided for providing secondary air to an exhaust system during catalyst warm-up. In one example, a method may include operating an engine in a thermactor mode responsive to a cold start condition, the thermactor mode including skipping a first number of engine cylinders and producing torque via a remaining number of the engine cylinders, and differently adjusting a cylinder valve of at least one of the first number of the engine cylinders relative to the remaining number of the engine cylinders while operating in the thermactor mode. In this way, exotherms may be generated by the secondary air reacting with fuel in exhaust gas, thus increasing a temperature of the catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.