Combined identification of an inlet valve stroke phase difference and an outlet valve stroke phase difference of an internal combustion engine with the aid of lines of the same amplitude
US10718283B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 2017 |
| Grant date | Jul 21, 2020 |
| Priority date | — |
| Expiry date | Aug 10, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Various embodiments include a method for identifying an inlet and an outlet valve stroke phase difference comprising: measuring pressure oscillations during operation; generating a corresponding signal; determining a corresponding crankshaft phase angle; applying a discrete Fourier transformation to the pressure signal to determine amplitudes of selected frequencies in relation to the crankshaft phase angle; determining lines of equal amplitudes of the frequencies based on the amplitudes depending on the phase differences using reference lines; determining an intersection of the lines by projection into a common plane; and determining the inlet valve stroke phase difference and the outlet valve stroke phase difference from the determined common intersection point of the lines of equal amplitudes of the selected signal frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.