Injection rate control cam

Patent · Tue Oct 16 04:00:00 EDT 1990

OSTI ID:6451820

Perr, J P; Liang, E; Yu, R C; Ghuman, A S

This patent describes a cam for controlling the injection rate of fuel in a fuel injection system of an engine. The fuel injection system including a cyclically operating unit injector having a body, an injector plunger mounted for reciprocating movement in the injector body between an advanced position and a retracted portion to pump into the engine during each cycle a variable quantity of fuel up to a maximum quantity under rated engine conditions, and a drive train for converting rotational movement of the cam into reciprocating movement of the pumping plunger depending on the profile of the cam. The cam profile comprises at least a plunger retraction segment and a plunger advancement segment for controlling the velocity if injector plunger retraction and advancement, respectively, the plunger advancement segment including a pre-injection subsequent shaped to cause an initial quantity of fuel to be injected into the engine during each cycle at rated engine conditions while the pre-injection subsegment is in contact with the drive train, and an injection subsegment following the pre-injection subsegment.

• Assignee: Cummins Engine Co., Inc., Columbus, IN (USA)
• Patent Number(s): US 4962743; A
• Application Number: PPN: US s 7-362266
• OSTI ID: 6451820
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
CONTROL SYSTEMS
ENGINES
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES