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US 8,949,002 B2Granted
System and method for injecting fuel
AssigneeFord Global Technologies, LLC
InventorJoshua Putman Styron
Life of this patent
Estimating the term…
Abstract
Methods and systems for adjusting fuel injection of an internal combustion engine are disclosed. In one example, a change in fuel pressure is scheduled when a number of pilot fuel injections provided by a fuel injector to a cylinder transitions from a first number during a first engine cycle to a second number during a second engine cycle. The methods and systems may reduce engine emissions and improve engine noise characteristics.
Claims20
A method for fueling an engine, comprising:
- supplying fuel to a cylinder based on a pressure output from a first table expressing fuel pressure as a function of a first number of pilot fuel injections supplied to the cylinder in a first mode;
- supplying fuel to the cylinder based on a pressure output from a second table expressing fuel pressure as a function of a second number of pilot fuel injections supplied to the cylinder in a second mode;
- and
- changing from the first mode to the second mode in response to a first condition when a control parameter is increasing.
1 more element
A method for fueling an engine, comprising:
- supplying fuel to a cylinder at a first fuel pressure that is based on a first number of pilot fuel injections in a first mode, and supplying fuel to the cylinder at a second fuel pressure that is based on a second number of pilot fuel injections in a second mode, and changing from the first mode to the second mode in response to a control parameter increasing;
- and
- supplying fuel to a cylinder at the second fuel pressure that is based on the second number of pilot fuel injections in the second mode, and supplying fuel to the cylinder at the first fuel pressure that is based on the first number of pilot fuel injections in the first mode, and changing from the second mode to the first mode in response to the control parameter decreasing.
An engine system, comprising:
- a cylinder;
- a fuel rail;
- a fuel injector in fluidic communication with the fuel rail and directly injecting fuel into the cylinder;
- and
- a controller including a computer program stored in a non-transitory medium including executable instructions to adjust fuel pressure in the fuel rail based on a number of pilot fuel injections provided to the cylinder during a cycle of the cylinder, the controller including instructions to increase a fuel pressure in the fuel rail via increasing a high pressure fuel pump metering valve command and decreasing a fuel rail pressure control valve command.
2 more elements
Dependencies are inferred from the claim text.