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US 8,590,510 B2Granted
Fuel system for a multi-fuel engine
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, Joseph Basmaji, Ross Dykstra Pursifull
Life of this patent
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Abstract
Methods and systems are provided for operating an engine fuel system including fuels of different fuel types. A first fuel type is delivered for port injection upon circulation through a high pressure pump when direct injection of a fuel is not requested to cool and/or lubricate the high pressure pump.
Claims20
A fuel system for an internal combustion engine, comprising:
- a first fuel tank storing a first fuel type;
- a second fuel tank storing a second fuel type;
- a group of port fuel injectors in communication with a group cylinders;
- a group of direct injectors in communication with the group of cylinders;
- a first low pressure fuel pump in communication with the first fuel tank;
- a high pressure fuel pump in communication with the group of port fuel injectors via a solenoid valve, and further communicating with the group of direct injectors;
- and
- a control system configured with instructions for:
- supplying the first fuel type solely from the first fuel tank to the group of port fuel injectors via the first low pressure fuel pump and the high pressure fuel pump;
- and
- supplying the first fuel type solely from the first fuel tank to the group of direct injectors via the first low pressure fuel pump and high pressure fuel pump.
8 more elements
A method of operating an engine fuel system, comprising:
- supplying a first type of fuel solely from a first fuel tank to a second fuel pump and to a group of port fuel injectors via a first fuel pump, an output of the second fuel pump in communication with a group of direct injectors;
- and
- supplying the first type of fuel from the second fuel pump outlet to the group of port fuel injectors.
A method of operating an engine fuel system, comprising:
- during a first condition, delivering a first type of fuel solely from a first fuel tank to a first port injector and a second fuel pump via a first fuel pump, the second fuel pump outlet communicating with a first direct injector and the first port injector;
- during a second condition, delivering the first fuel type solely from the first fuel tank to the first port injector via the first fuel pump while bypassing the second fuel pump;
- and
- during a third condition, delivering the first fuel type solely from the first fuel tank to the first direct injector via the first fuel pump and the second fuel pump.
1 more element
Dependencies are inferred from the claim text.