GDI pump with direct injection and port injection
AssigneeStanadyne, Inc.
InventorRichard Paulo Pellini
Life of this patent
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Abstract
In a hybrid fuel supply system for the same high pressure supply pump used for gasoline direct injection (DI) is also used to supply the port injection (PI) system. For a given pumping stroke, fuel can be delivered only to the DI system, only to the PI system, or a first portion can be delivered to the DI system and a second portion delivered to the PI system. The pumping chamber always fills to maximum volume. Fuel metering for DI is by a control valve, which when closed delivers fuel into the DI system and when opened “spills” pumped fuel into the PI system. Any “spill” at high pressure opens a pressure regulating valve in the PI system that dumps fuel at excess pressure to a low pressure region to maintain the PI system at a constant target pressure.
Claims16
A fuel pump for a fuel supply system having some injectors supplied by a pressurized common rail and other injectors supplied through inlet ports, comprising:
- a feed passage (19) with inlet check valve (5);
- a pumping plunger (2) reciprocable in a pumping chamber (3) that is fluidly connected to the feed passage downstream of the inlet check valve, for pressurizing the feed of fuel;
- a discharge passage (15) from the pumping chamber for delivering pressurized fuel to a first outlet check valve (7);
- a direct injection passage (16) extending through the first outlet check valve for fluid connection of the pump to a common rail (11);
- an auxiliary passage (17) in fluid communication with the discharge passage (15) upstream of the first outlet check valve;
- a control valve (6) having an inlet side in fluid communication with the auxiliary passage (17) and an outlet side, wherein the control valve selectively closes against flow through the control valve or opens to permit flow through the outlet side of control valve;
- and
- a port injection passage (18) from the outlet side of the control valve for fluid connection of the pump to an inlet port on individual injectors (14), through a second outlet check valve (9).
A fuel pump for a fuel supply system having some injectors supplied by a pressurized common rail and other injectors supplied through inlet ports, comprising:
- a pumping plunger (2) reciprocable in a pumping chamber (3);
- a direct injection passage (16) with a first outlet check valve (7), for selective fluid communication between the pumping chamber and a fluid connection (20) of the pump to a common rail (11);
- a control valve (6) having an inlet side and an outlet side, said control valve allocating fuel flow to the fluid connection (20) of the pump to the common rail (11) and the fluid connection (21) of the pump to individual port injectors (14);
- and
- a port injection passage (18) from the outlet side of the control valve for selective fluid communication between the pumping chamber and a fluid connection (21) of the pump to an inlet port on individual injectors (14), through a second outlet check valve (9).
A fuel pump comprising:
- a feed passage (19) with inlet check valve (5);
- a pumping plunger (2) reciprocable in a pumping chamber (3) that is fluidly connected to the feed passage downstream of the inlet check valve (5), for pressurizing the feed of fuel;
- a first pumped fuel outlet (20) in selective fluid communication with the pumping chamber (3);
- a second pumped fuel outlet (21) in selective fluid communication with the pumping chamber (3);
- a control valve (6) having an inlet side and an outlet side, said control valve allocating fuel flow to the first pumped fuel outlet (20) and the second pumped fuel outlet (21);
- and
- a port injection passage (18) from the outlet side of the control valve for fluid communication of the pump to an inlet port on individual injectors (14), through a second outlet check valve (9).
Dependencies are inferred from the claim text.