Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2006-09-26
2006-09-26
Wolfe, Jr., Willis R. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C239S088000, C239S533800
Reexamination Certificate
active
07111613
ABSTRACT:
A fuel injector for an internal combustion engine having a crankshaft is disclosed. The fuel injector has plunger to displace fuel and an electronically controlled spill valve. The fuel injector also has a nozzle member having at least one orifice and a valve needle disposed within the nozzle member, and movable against a spring bias to selectively inject pressurized fuel through the at least one orifice. The fuel injector also has an electronically controlled check valve. The valve needle is automatically moved to inject pressurized fuel when the pressure of the fuel within the fuel injector reaches a predetermined valve opening pressure determined by a spring bias. Valve elements of the electronically controlled spill and check valves are both in a flow blocking position before the pressure of the fuel within the fuel injector reaches the predetermined valve opening pressure. Injection terminates when the valve element of the electronically controlled check valve is moved to a flow-passing position.
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Barnes Travis E.
Coldren Dana R.
Lewis Stephen R.
Li Daniel Yongxiang
Sankar Rammohan
Caterpillar Inc.
Finnegan,Henderson,Farabow,Garrett&Dunner
Wolfe, Jr. Willis R.
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