Common-rail fuel-injection system
US6349702B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 2000 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | Sep 15, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2250/31
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A common-rail fuel injection system is disclosed, which calculates a mean value of common-rail pressures that remain pulsating after pressure drop due to any fuel injection, and considers the mean value to be a net common-rail pressure after fuel injection thereby finding with accuracy an amount of fuel to be injected. The common-rail pressure kept constant before the beginning of the fuel injection starts pulsating due to a pressure surge or oil hammer resulting from the fuel injection. The mean value is derived from the common-rail pressures sensed over a time interval for data sampling, which starts with the beginning of the command pulse. The mean value may be considered to be an approximation close to the net common-rail pressure that has fallen due to the fuel injection. The amount of fuel injected, as given depending on a net amount of pressure drop from the pressure before any fuel injection to the mean value, may be found accurately irrespective of characteristic deviation every injector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.