Fuel cutoff for better transient control

Patent · Tue Dec 31 04:00:00 EST 1991

OSTI ID:5433880

Yu, R; Perr, J P

This patent describes a fuel injector for use in an internal combustion engine for periodically injecting a metered quantity of fuel supplied under varying pressure from a fuel supply into a combustion chamber of the engine. It comprises a body containing a central bore, a fuel supply passage adapted to direct fuel from the fuel supply into the central bore, and at least one injection orifice through which fuel in the central bore may be injected into the combustion chamber, an injector plunger mounted for reciprocating movement within the central bore between an innermost position and an outermost position to form an injection chamber within the central bore below the innermost end of the plunger when the plunger is displaced from its innermost position, the injection chamber being in constant communication with the injection orifice and in communication with the fuel supply passage when the injector plunger is displaced at least a predetermined distance from its innermost position; and fuel cutoff associated with the supply passage and in close proximity to the injection chamber for closing off the communication between the supply passage and the injection chamber wherever the fuel pressure in the supply passage upstream of the fuel cutoff means falls below a predetermined limit, wherein the predetermined limit is independent of the pressure within the injection chamber.

• Assignee: Cummins Engine Co., Inc., Columbus, IN (United States)
• Patent Number(s): A; US 5076236
• Application Number: PPN: US 7-495121
• OSTI ID: 5433880
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
440800 -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
CONTROL
CONTROL EQUIPMENT
ENERGY SUPPLIES
ENGINES
EQUIPMENT
FUEL INJECTION SYSTEMS
FUEL SUPPLIES
FUEL SYSTEMS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
PRESSURE DEPENDENCE
PRESSURE REGULATORS