Methods and system for operating skipped cylinders to provide secondary air
US11365695B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2021 |
| Grant date | Jun 21, 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, during a cold start condition, operating an engine with a number of cylinders deactivated and a remaining number of cylinders active, and adjusting a first air charge within a deactivated cylinder of the number of cylinders relative to relative to a second air charge within an active cylinder of the remaining number of cylinders. In this way, an amount of secondary air provided to the exhaust system of the engine may be more robustly controlled, thus decreasing cooling of the exhaust system during the cold start condition that may otherwise occur due to excess secondary air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.