Method of using inductance for determining the position of an armature in an electromagnetic solenoid
US6657847B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2000 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Nov 16, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H47/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved method for controlling the landing velocity of an armature in an electromechanical actuator, such as a fuel injector, fuel pressure regulator, or engine valve actuator is provided. The position and velocity of an armature during a stroke is dynamically estimated by calculating the inductance and rate of change of inductance of the actuator coil in real-time as the armature moves through its stroke, compensating for non-linear permeability and magnetization effects due to changing gap, temperature, magnetic material properties or magnetic architecture, normalizing the calculated inductance value at the end of a stroke (zero gap), and mapping the value of normalized inductance to correspond to an armature position by an algebraic transformation. Inductance may be used directly as a position variable without mapping it to units of position. Rate of change of inductance may be used as a rate variable without mapping it to units of velocity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.