Camshaft rotational phase detecting apparatus and cylinder intake air quantity calculating apparatus for engine
US6718920B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2002 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Feb 5, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/34
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A camshaft rotational phase detecting apparatus for an engine provided with a variable valve timing control mechanism which controls a camshaft rotational phase of an engine valve to a target camshaft rotational phase by varying a rotational phase of a camshaft relative to a crankshaft. The camshaft rotational phase detecting apparatus is configured to detect a camshaft rotational phase as a detected camshaft rotational phase based on a signal from a sensor. In the apparatus, the detected camshaft rotational phase is substituted with a maintained rotational phase for a predetermined period and is substituted with a target camshaft rotational phase after a lapse of the predetermined period, when the camshaft rotational phase is not detected. In the apparatus, the maintained rotational phase is set corresponding to the detected camshaft rotational phase detected before a timing that the camshaft rotational phase is not detected. Additionally, in the apparatus, the predetermined period is set in accordance with an engine temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.