Methods and systems for a fuel system
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, Joseph F. Basmaji, Ross Dykstra Pursifull
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Abstract
Various methods and system are described for a fuel system which includes a fuel composition sensor and a fuel lift pump disposed upstream of the sensor. The system may be operated in each of three different modes of operation. In each of the modes, a fuel lift pump voltage is adjusted responsive to a fuel capacitance output by the sensor, while a variable such as sensor temperature or fuel pump pressure is maintained depending on the mode of operation.
Claims20
A method for a gasoline direct injection engine system, comprising:
- operating a fuel lift pump at a pressure within a threshold range above a fuel vapor pressure, the vapor pressure based on fuel capacitance.
A method for a fuel system including a fuel composition sensor and a fuel lift pump, comprising:
- in a first mode, maintaining a fuel lift pump pressure at a selected pressure above a fuel vapor pressure, and adjusting a fuel lift pump voltage responsive to a fuel capacitance;
- in a second mode, maintaining a temperature of the sensor at a selected temperature, and adjusting the fuel lift pump pressure responsive to an indication of fuel vaporization, the indication responsive to a fuel vapor pressure which is based on the fuel capacitance;
- and
- in a third mode, increasing the fuel lift pump pressure responsive to the indication of fuel vaporization.
A fuel system, comprising:
- a fuel lift pump;
- a fuel composition sensor positioned downstream of the fuel lift pump in a fuel passage, and configured to output a signal indicating fuel capacitance;
- a control system in communication with the sensor, the control system including non-transitory instructions to adjust a fuel lift pump voltage responsive to the fuel capacitance in each of three different modes of operation.
Dependencies are inferred from the claim text.