Electronically controlled fuel injector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 7, 1990
Grant Date -
N/A
app pub date -
Nov 25, 1988
filing date -
Dec 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The injector 10 for intermittently injecting fuel under high pressure in an internal combustion engine is provided with an injector valve member (18). The movement of this injector valve member (18) to open and close a fuel discharge orifice (24) is controlled by the fuel pressure in a control chamber (40) acting on a valve piston (26) on the side opposite to the discharge orifice (24). A cylindrical member (36) surrounds the upper part (30) of the valve piston (26). Energization of a solenoid (44) results in the opening of a pilot valve (46) and a subsequent quick drop of the fuel pressure in the control chamber (40). The solenoid (44) in addition to its function as a high speed actuator for the pilot valve (46) is also used to carry and transmit the force resulting from the fuel pressure in the control chamber (40) and acting on the cylindrical member (36), on the solenoid (44) and on further members (48, 50, 52, 14). Since the solenoid (44) can therefore be mounted directly within the injector housing (14), the design of the injector (10) can be very compact and simple.
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