Timing of fuel injected engines
US4807572A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1987 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Mar 11, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of operating a two-stroke spark ignition engine (9) wherein the fuel is injected directly into the combustion chamber (22). The timing of the injection of the fuel is varied according to engine load and speed conditions. Under low load and speed conditions at least 80% of the fuel is injected after closure of the exhaust port (20) whereas under some high load conditions at least 80% of the fuel is injected before closure of the exhaust port (20). The method may also comprise adjustment of ignition timing so that, in conjunction with low load and speed conditions, ignition occurs at least 5.degree. of crankshaft rotation after commencement of fuel injection and up to 70.degree. before top dead center of the engine cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.