Method and system for estimating fuel composition
AssigneeFord Motor Company of Australia Limited
InventorsAdam Nolan, Jamie Terence Slaymaker, Andrew Paul Chee Aun Wong, Phuoc Bui Buiquang
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for operating a fuel system configured to deliver a gaseous fuel to an engine. Following tank refilling, the fuel composition is selectively updated based on fuel tank pressure, temperature, and air content data. When the engine is subsequently restarted, the fuel rail is primed for a duration based on the updated composition.
Claims20
A method for an engine operating on a gaseous fuel, comprising:
- inferring a refill event based on a rate of change in fuel tank pressure;
- and
- in response to the refill event,
- selectively updating an estimated fuel composition;
- and
- priming a fuel rail during a subsequent engine restart, a priming duration based on the updated composition.
A method for an engine operating on a gaseous fuel, comprising:
- during a first tank refill event when a fuel tank air content is less than a threshold, updating an estimated fuel composition;
- and
- during a second tank refill event when the fuel tank air content is higher than the threshold, not updating the estimated fuel composition.
A method for an engine operating on a gaseous fuel, comprising:
- inferring a refill event based on a increase in the tank fuel level;
- and
- in response to a refill event,
- selectively updating an estimated fuel composition based on each of a fuel tank pressure, a fuel tank air content and a lower of a fuel tank temperature and an ambient temperature;
- and
- priming a fuel rail during a subsequent engine restart, a priming duration adjusted based on the selective updating.
Dependencies are inferred from the claim text.