Pressure measuring device and corresponding method
US8297114B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2009 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Jun 16, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/281
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Device for measuring cylinder pressure of an internal combustion engine includes a pressure sensor that includes a piezoelectric element associated with a capacitive element, and an output generating a first voltage representative of the cylinder pressure. A filtering module of the device filters parasitic low-frequency voltages and generates a second voltage free of these parasitic voltages. A control module delivers a control signal that is dependent on a switching parameter correlated with a stroke. A switching module, in response to the control signal, disconnects the input of the filtering module from the output of the pressure sensor during the first stroke and connects the input of the filtering module to the output of the pressure sensor during the second stroke. The first stroke corresponds to a compression stroke or to a combustion-expansion stroke, and the second stroke corresponds to an intake stroke or to an exhaust stroke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.