Determining the closing time of a fuel injection valve based on evaluating the actuation voltage
US8935114B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2010 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Sep 12, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2007/1861
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for determining a closing time of a valve having a coil drive, in particular a direct injection valve for an engine of a motor vehicle, has the steps: (a) switching off a current flow through a coil (L_inj) of the coil drive, so that the coil (L_inj) is depowered, (b) capturing a time curve (110) of a voltage induced in the non-powered coil (L_inj), wherein the induced voltage is generated by decaying eddy currents in a magnetic circuit of the coil drive and by a motion of the armature relative to the coil (L_inj), (c) evaluating the captured time curve (110) of the voltage induced in the coil (L_inj), and (d) determining the closing time based on the evaluated time curve (110). A corresponding device and a computer program for determining the closing time of a valve with a coil drive can be provided accordingly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.