Method for adjusting an on-time calculation model or lookup table and a system for controlling an injector of a cylinder in a combustion engine
US7437234B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 2007 |
| Grant date | Oct 14, 2008 |
| Priority date | — |
| Expiry date | May 11, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for adjusting an on-time calculation model or a lookup table used for determining on-time values for an injector of a cylinder in a combustion engine useful in a motor vehicle, where the injector is connected to a fuel accumulator. The method comprises the steps of injecting a test fuel quantity exceeding the maximum allowed fuel injection quantity under such conditions that no ignition of the injected fuel takes place; measuring the pressure drop in the fuel accumulator during the test injection; establishing the actual fuel quantity injected during the test injection based on the pressure drop; performing a comparison based on the actual fuel quantity or the corresponding on-time value established with the aid of the on-time calculation model or the lookup table; and adjusting the on-time calculation model or lookup table in dependence on the result of the comparison. An apparatus which performs the method. A computer program to perform the method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.