Three-way actuation control of a hydraulically actuated fuel injector
US6237857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Aug 11, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86614
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An actuation fluid control valve assembly for a hydraulically actuated fuel injector comprises a valve body defining a rotary valve bore and a spool valve bore. An actuator is connected with the valve body. A rotary valve member is rotatably disposed in the rotary valve bore and can be rotated in response to the actuator. A high-pressure fluid line, a spool bottom line, a check control line, and an actuator fluid drain all terminate in the rotary valve bore. At one rotary valve position, both the check control line and the spool bottom line are open to the high-pressure line. Moving the rotary valve from the first position to a second position opens the spool bottom line to the actuator fluid drain while keeping the check control line open to the high-pressure line. Moving the rotary valve from the second position to a third position opens the check control line as well as the spool bottom line to the actuator fluid drain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.