F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/135, 341/38.
F02M 61/00 (2006.01) F02M 57/02 (2006.01) F02M 59/30 (2006.01) F02M 59/32 (2006.01) F02M 59/36 (2006.01)
Patent
CA 1182358
Abstract: PRESSURE-TIME CONTROLLED UNIT INJECTOR A fuel injector (10) is provided for each cylinder of an internal combustion engine, the injector including an electronically operated control valve (60) disposed between supply passage (4 2) and a timing chamber (80) to control the admission of fuel into and out of the timing chamber. A primary pumping piston (62) and a secondary floating piston (72) are axially spaced within the central bore (70) of the injection body, and a normally closed injection nozzle (14) is situated at one end of the injector body. A mechanical linkage (27, 28, 30) associated with the camshaft of the engine drives the primary pumping piston (62) against the bias of a main spring (18). The timing chamber (80) is defined between the pistons (62, 72) and a metering chamber (82) is defined between the secondary piston (72) and the nozzle (14). An electronic control unit (52) responds to engine operating conditions, and delivers a signal to the control valve (60) to close the valve and seal the timing chamber for a controlled period of time to form a hydraulic link so that the pistons (62, 72) move in concert during the injection and metering phases of the cycle of operation. When the signal from the ECU is terminated, the control valve opens, and breaks the link so that the primary piston (62) moves independently of the secondary piston (72). The timing function can be adjusted by the ECU relative to any preselected position of the crankshaft to optimize engine performance. The metering function is controlled by the pressure drop across a restricting orifice (98) in the passageway feeding fuel to the metering chamber (82). The flow rate through the metering orifice is proportional to the square root of the pressure drop across the orifice.
406543
Lewis Donald J.
Sisson Albert E.
Bendix Corporation (the)
Macrae & Co.
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