Pressurized fuel injection system for multi-cylinder engines, particularly diesel engines
US4479475A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 1982 |
| Grant date | Oct 30, 1984 |
| Priority date | — |
| Expiry date | Nov 29, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/21
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
To provide for a compact and readily controlled injection system, so that initiation of fuel injection, and termination thereof can be electrically controlled, and independently of mechanical injection control pressure, and to provide for use of only a single connection line between a fuel supply (33-36; 32-41) and the respective injection valves (11-14), a piezo-electrically controlled control valve (38, 59) interposed between two each injection valves, which are, each operated by cams (2-5) to provide injection pressure. The injection valves (38, 39) permit communication, or blocking of the respective single lines (30, 31, 39, 40) from the fuel supply lines (32, 41), which will then function both as fuel supply, as well as overflow and drain lines. The cams (25) of paired valves are so arranged and offset that when one of the paired valves is commensing its injection stroke, the other one of the paired valves is moving into its OFF position. Actual injection time is controlled by a piezo-electric-hydraulic servo piston, of substantially larger diameter than the spool (45) of the spool valve injection control valve, to move the spool between communication line closing, or blocking…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.