Airflow control for multiple-displacement engine during engine displacement transitions
US7013866B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2005 |
| Grant date | Mar 21, 2006 |
| Priority date | — |
| Expiry date | Mar 23, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/704
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for controlling airflow in an intake manifold of a multiple-displacement engine during an engine displacement mode transition includes determining, before a displacement mode transition, a post-transition mass air flow rate necessary to maintain a pre-transition engine torque output, as well as an airflow transient multiplier based on engine speed and an estimated post-transition manifold air pressure. After multiplying the requested mass air flow rate with the transient multiplier, the resulting compensated requested mass air flow rate is divided by a maximum mass air flow rate to obtain a requested percent airflow. The percent airflow is thereafter used with engine speed to determine a requested post-transition manifold air pressure-to-barometric pressure ratio, for example, using a lookup table; and the requested post-transition pressure ratio is used to determine a transient post-transition throttle position, to which an engine throttle will be moved upon initiating the displacement mode transition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.