Methods and systems for adjusting a direct fuel injector
AssigneeFord Global Technologies, LLC
InventorsEthan D. Sanborn, Paul Hollar, Joseph Lyle Thomas, Daniel Dusa
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for reducing direct injector fueling errors due to injection variability in a transition region of a direct injector map. Fuel injection, including usage of one or more direct and port injected fuel pulses, may be planned based on engine operating conditions including engine temperature and driver demand. Responsive to any of the direct injected fuel pulses having a pulse-width that lies in a high variability transition region of the direct injector, the fuel injection may be adjusted via adjustments to a number and/or split ratio of the injections so as to not operate in the transition region.
Claims19
A method for an engine, comprising:
- estimating an initial ratio of port injected fuel relative to direct injected fuel on a combustion cycle based on engine operating conditions;
- and
- responsive to a direct fuel injection at the initial ratio being in a transition region of a direct injector map, updating the initial ratio to move the direct fuel injection out of the transition region,
- wherein the transition region is positioned between a ballistic region and a lift region of the direct injector map, and wherein direct injector variability in the transition region is higher than each of the ballistic region and the lift region.
A method, comprising:
- during a first condition, responsive to a pulse-width of one of multiple direct injection fuel pulses of a combustion cycle lying within a transition region of a direct injector map, reducing a number of the multiple direct injection fuel pulses while maintaining a split ratio of direct injected to port injected fuel;
- and
- during a second condition, responsive to the pulse-width of the one of the multiple direct injection fuel pulses of the combustion cycle lying within the transition region of the direct injector map, adjusting the split ratio of direct injected to port injected fuel.
An engine system, comprising:
- an engine cylinder;
- a direct injector for fueling the cylinder;
- a port injector for fueling the cylinder;
- and
- a controller with computer readable instructions stored on non-transitory memory for:
- estimating an initial fuel injection profile for a combustion cycle of the cylinder based on engine speed-load and engine temperature, the initial fuel injection profile including an initial split ratio of direct injected fuel to port injected fuel delivered via multiple direct injection fuel pulses, at least one of the multiple direct injection fuel pulses having a pulse-width in a transition region of the direct injector;
- and
- modifying the initial fuel injection profile to change the split ratio of direct injected fuel to port injected fuel so that the at least one of the multiple direct injection fuel pulses is moved out of the transition region.
Dependencies are inferred from the claim text.