Positive displacement electronic fuel injection pump

Patent · Mon Apr 21 23:00:00 EST 1986

OSTI ID:5543776

Schechter, M M

A fuel injection pump is described of the plunger, spill port type, including a single plunger reciprocably and rotatably mounted in a plunger barrel, an engine driven camshaft having gear means and a number of camlobes thereon for reciprocating and rotating the plunger a number of times for each revolution of the camshaft through a number of pumping upstrokes and fuel intake downstrokes for injecting fuel sequentially into a number of engine cylinders. The plunger barrel defines a fuel fill-spill chamber at the end of the plunger connected to a solenoid valve controlled spill port for pressurization of the chamber during the upstroke of the plunger upon closure of the spill port by the valve, the plunger having a number of internal axially spaced passages connected to the chamber for filling the chamber with fuel on the fuel intake upstroke of the plunger or alternately directing fuel from the chamber to a fuel injection nozzle during pressurization of the chamber, means connecting one of the internal passages to a fuel supply passage and another passage to a fuel injection nozzle line past a check valve in the other passage. The passages are spaced such that rotation and reciprocation of the plunger through one stroke connects the chamber to one passage which disconnecting the chamber from the other passage, and vice-versa during the next successive stroke of the plunger, the other passage being connected successively one at a time to each injection line in the engine upon rotation of the camshaft, the engine having at least four cylinders, and the camshaft having four camlobes on a single cam, the lobes each being 90% in extent with a peak and an essentially long flat surface inbetween peaks providing a slower upstroke of the plunger than the downstroke thereby providing a longer time for injection than for fuel intake.

• Assignee: Ford Motor Co., Dearborn, MI
• Patent Number(s): US 4583508
• OSTI ID: 5543776
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
CONTROL EQUIPMENT
CYLINDERS
DESIGN
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ENGINES
EQUIPMENT
FLOW REGULATORS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
GEARS
HEAT ENGINES
INCIDENCE ANGLE
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MOTION
NOZZLES
PRESSURIZING
PUMPS
ROTATION
SHAFTS
SOLENOIDS
TIME DEPENDENCE
VALVES