Position sensing transducer
US4284990A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1980 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Mar 3, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P7/061
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A displacement transducer suitable for monitoring the angular rotation of an internal combustion engine is provided. The transducer comprises a rotary disc having a castellated periphery and mounted for rotation with the engine. First and second coils are mounted such that upon operation of the engine the castellations of the disc interrupt the inductive coupling therebetween. The first coil is fed with an oscillatory electrical signal which induces in the second coil an output signal of a first peak amplitude during the interruptions produced by the castellations and of a second peak amplitude during periods between the interruptions. Thresholding circuitry responsive to the output signal produces a control signal which is indicative of the commencement and cessation of the interruptions. In accordance with one disclosed embodiment, the threshold circuitry includes a pair of inverters sharing the same thermal environment. The first inverter is capacitively coupled to receive the output signal from the second coil, and the second inverter, which has its output connected to its input in a feedback arrangement, provides bias through a resistive coupling to the first inverter to compe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.