Valve seating noise discriminating system for engine with variable valve operating system
US5505176A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1994 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Oct 6, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A valve seating noise discriminating system discriminates valve seating noises caused by valves of a valve system in an engine from noises caused by knocking. Ignition timing can be prevented from being erroneously retarded due to the valve seating noises. A variable valve operation control unit A1 selects one of a plurality of valve operation modes. A knocking detecting unit A2 detects vibrations equivalent to knocking and issues a knocking present signal K. A valve seating noise discriminating unit A3 discriminates a valve seating noise when a level of a first knocking present signal K meets a predetermined requirement. When it is in a standby state, a cylinder number storage A4 stores a cylinder number associated with the first knocking present signal K when the valve seating noise discriminating units discriminates the valve seating noise. A knocking determining unit A5 determines the presence of actual knocking when a second knocking present signal K is issued for a cylinder which differs from the cylinder associated with the first knocking present signal. Then, an ignition timing calculating unit A6 corrects target ignition timing .theta..sub.adv in response to the knocking p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.