Method for determining fuel injection rate shaping current in an engine fuel injection system
US6513371B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2001 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Aug 3, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/2058
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for calibrating a fuel injection pump for an engine fuel injection system comprising determining the pressure made available to an injector nozzle at a portion of the injection cycle before the top dead center position of the engine crankshaft. A solenoid-operated control valve establishes a rate of fuel delivery through the injector nozzle. The method calculates a boot current for the valve, which will achieve optimum pressure delivery through the nozzle. An electronic controller for the injection system calibrator relies upon an algorithm to find the lowest and the highest boot current level that will achieve injector stability. The logic of the system will increase the precision of the boot current by repeated substitution of incremental current values to determine an upper limit and a lower limit for the boot current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.