System for maintaining a pump inlet pressure
AssigneePerkins Engines Company Limited
InventorPaul John Smith
Life of this patent
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Abstract
A fuel system is disclosed. The fuel system has a first pump configured to provide fuel at a first pressure. The fuel system also has a control valve disposed downstream of the first pump, the control valve being configured to selectively direct the fuel at the first pressure to a treatment device and a regulator valve. The fuel system further has a fuel filter disposed downstream of the regulator valve. The fuel system also has a second pump disposed downstream of the fuel filter. The fuel system further has a relief valve disposed downstream of the fuel filter and upstream of the second pump, the relief valve being configured to maintain fuel upstream of the second pump at a second pressure that is different from the first pressure.
Claims20
A fuel system, comprising:
- a first pump configured to provide fuel at a first pressure;
- a control valve disposed downstream of the first pump, wherein the control valve is configured to selectively direct the fuel at the first pressure to a treatment device and a regulator valve;
- a fuel filter disposed downstream of the regulator valve;
- a second pump disposed downstream of the fuel filter;
- and
- a relief valve disposed downstream of the fuel filter and upstream of the second pump, the relief valve configured to maintain fuel upstream of the second pump at a second pressure that is different from the first pressure.
A method for directing fuel flow, comprising:
- pressurizing fuel at a first pressure;
- selectively directing the pressurized fuel at the first pressure toward a treatment device and toward a pump;
- injecting the fuel into the treatment device to selectively affect regeneration;
- filtering the fuel upstream of the pump;
- and
- selectively pressurizing fuel at a second pressure, downstream of the filtering and upstream of the pump.
A fuel injection system, comprising:
- a reservoir;
- a first filter fluidly connected downstream of the reservoir;
- a first pump configured to provide fuel at a first pressure;
- a control valve located downstream of the first pump, wherein the control valve is configured to selectively direct fuel toward a treatment device and a regulator valve;
- a second filter located downstream of the regulator valve;
- a second pump located downstream of the second filter;
- and
- a relief valve located downstream of the second filter and upstream of the second pump, the relief valve configured to maintain a second pressure at an inlet of the second pump that is less than the first pressure.
Dependencies are inferred from the claim text.