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US 12,169,158 B2Granted
Methods and systems for fuel system
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for a fuel system. In one example, a method includes adjusting a threshold of a diagnostic based on a distance between a fuel tank and a ground surface. The distance is inferred based on a vehicle weight.
Claims15
A system, comprising:
- a vehicle comprising a fuel tank;
- a vehicle weight sensor for obtaining a vehicle weight;
- an ambient air temperature sensor for obtaining an ambient air temperature;
- a ground surface temperature sensor for obtaining a ground surface temperature;
- and
- a controller comprising computer-readable instructions stored on non-transitory memory thereof that when executed cause the controller to:
- adjust a threshold pressure and a threshold vacuum of a fuel system leak diagnostic based on the vehicle weight and the ground surface temperature,
- maintaining the threshold pressure and the threshold vacuum based on the vehicle weight being less than the threshold weight or the ground surface temperature being within a threshold difference of the ambient air temperature.
5 more elements
A method for a fuel system leak diagnostic, the method comprising:
- obtaining a vehicle weight based on an input from a first sensor;
- obtaining a ground surface temperature based on an input from a second sensor;
- obtaining an ambient air temperature based on an input from a third sensor;
- compensating for an effect of the ground surface temperature on the fuel system leak diagnostic by adjusting a threshold pressure and a threshold vacuum based on the vehicle weight and the ground surface temperature;
- maintaining the threshold pressure and the threshold vacuum based on the vehicle weight being less than a threshold weight or the ground surface temperature being within a threshold difference of the ambient air temperature;
- performing the fuel system leak diagnostic by:
- measuring a pressure in the fuel system during a first time period and comparing the pressure with the adjusted threshold pressure;
- and
- measuring a vacuum in the fuel system after the first time period has elapsed, and comparing the vacuum with the adjusted threshold vacuum;
- and
- based on a result of the fuel system leak diagnostic, opening a valve and/or performing one or more of:
- adjusting a maximum engine load to reduce fuel consumption, adjusting a commanded A/F ratio, and operating the vehicle in battery-only mode during certain conditions.
9 more elements
Dependencies are inferred from the claim text.