Cylinder inner pressure detector for internal combustion engine
US8733157B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2012 |
| Grant date | May 27, 2014 |
| Priority date | — |
| Expiry date | Nov 24, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An cylinder inner pressure detector of an internal combustion engine includes: a reference voltage output circuit for outputting a reference voltage having a level, which is selected among multiple levels according to a switching signal; a level shift circuit for shifting a level of a sensor signal of an inner pressure sensor by a selected level of the reference voltage toward a signal potential side corresponding to a low pressure side of cylinder inner pressure; a first A/D converter circuit for converting the shifted sensor signal from an analog signal to a digital signal; and a controller for outputting the switching signal, which provides the reference voltage such that the reference voltage has the level on the signal potential side corresponding to the low pressure side from an offset voltage, and for detecting the cylinder inner pressure based on the digital signal output from the first A/D converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.