System and method for measuring rotation speed and direction of tappets (lifters) of an engine valve train
US9316509B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 2013 |
| Grant date | Apr 19, 2016 |
| Priority date | — |
| Expiry date | Jun 19, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2451
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of measuring direction of rotation of a tappet of an engine valve train. Two opposing notches are machined or otherwise formed in the outer surface of the tappet. Two sensors proximate the outer surface of the tappet are operable to detect the change in distance resulting from the notches as the tappet rotates. There is a predetermined difference angle of separation between the arc distance between the notches and the arc distance between the sensors. Each sensor outputs a square wave output having pulses whose width represents detection of the notches by the sensor. The location of the pulses of the two square wave outputs is compared to determine direction of rotation of the tappet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.