Method and apparatus for controlling fuel injection in an internal combustion engine
US5685273A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1996 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Aug 7, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/025
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Fuel delivery to an engine from a cyclically pressurizable, electronically controlled accumulator-type fuel injector is controlled by "wasting" at least a portion of the pressurization stroke of the engine's high pressure pump so that a designated portion of the pressurization stroke of the pump does not result in accumulator cavity pressurization. Metering is effected simply by extending the period that the system's existing solenoid vent valve is open into a portion of the succeeding pressurization stroke of the pump so that a portion of the pumped fuel flows directly to vent. Additional electrical load on the engine can be minimized by using a latching type solenoid valve as the vent valve. The metering scheme 1) is more precise than metering schemes heretofore available for injectors of the disclosed type, 2) does not adversely effect injection timing or other injection parameters, 3) and requires no additional hardware.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.