Method and device for controlling piezo-driven fuel injection valves
US6847881B2 · kind B2 · utility
7Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 1, 2004 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Mar 1, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The force exerted on an injector valve (4, 5), by the piezo-actuator (3) on a main injection, is determined by means of a non-linear actuator model (8) and thus the gradient (−dFHdt) of the drop-off in force after the force maximum (FHmax) and a threshold value (G) are derived, with which a gradient (−dFV/dt) determined for the pre- or post-injection is compared and, depending on the result of the comparison, the signal parameter (p) for the subsequent pre- or post-injection(s) is corrected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.