Position sensor of a valve actuator for an internal combustion engine
US7188592B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2005 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Jun 15, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2291
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor of the position of a target is secured to an electromagnetic or electromechanical valve actuator of an internal combustion engine. The target is driven by a reciprocating translatory motion (f+, f−) in synchronism with that of the valve. The sensor uses an eddy current transducer, including two secondary coils connected in series opposition and a primary coil fed by a radio frequency current. The output signal of the transducer is sent to a phase locked loop synchronous detector. The coils are engraved or printed on a flexible film. The transducer is arranged in an external tube made of aluminum and includes an internal wall made of insulating material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.