Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1982-11-29
1984-10-30
Myhre, Charles J.
Internal-combustion engines
Charge forming device
Fuel injection system
123451, 123458, F02M 4102, F02M 3900
Patent
active
044794754
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, and communicating positions in accordance with electrical signals applied to the electrical positioning transducer. Thus, the cams mechanically control the longest possible injection stroke, the electrical signals permitting, however, selectively communication with the fuel supply system to provide, as required, selectively fuel supply to the injection valves, or otherflow therefrom when the spool of the valve establishes communication, whereas, when the spool blocks, fuel is being injected through the injection valve.
REFERENCES:
patent: 3308794 (1967-03-01), Bailey
patent: 3465737 (1969-09-01), Dreisin
patent: 3486493 (1969-12-01), Dreisin
patent: 4387686 (1983-06-01), LeBlanc et al.
patent: 4388908 (1983-06-01), Babitzka
patent: 4398518 (1983-08-01), LeBlanc et al.
patent: 4398519 (1983-08-01), Tissot
patent: 4438363 (1984-03-01), Babitzka
Miller Carl Stuart
Myhre Charles J.
Robert & Bosch GmbH
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