Engine valve control system and method
US7415950B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2007 |
| Grant date | Aug 26, 2008 |
| Priority date | — |
| Expiry date | Jan 25, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of operating an engine having at least one cylinder, said cylinder including at least one electric valve actuator, said actuator including at least a coil and an armature moveable thereto, the method comprising during a non-firing state of the cylinder: holding the armature of the actuator at a first position away from an equilibrium position by supplying a first amount of current to a first coil of the actuator; and reducing current supplied to the first coil from said first amount to a lower second amount to cause the armature to begin moving toward the equilibrium position; and during a subsequent firing state of the cylinder, varying an amount of holding current supplied to the first coil for holding the armature away from the equilibrium position based on at least said second amount of current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.