Back to results
US 10,294,882 B2Granted
Methods and systems for adjusting fueling of engine cylinders
AssigneeFord Global Technologies, LLC
InventorsEthan D. Sanborn, Mark Thomas Linenberg
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for enabling a transfer function of a direct injector and a port injector, each fueling an engine cylinder, to be accurately learned. During selected conditions, the direct injected fuel fraction may be actively changed from a target fraction to one of an upper and lower limit of the direct injector so as to provide a measurable air-fuel ratio error. Fueling errors for the distinct fuel injectors is then learned based on the measured air-fuel ratio error relative to the actively changed fuel fraction.
Claims7
A method for an engine, comprising:
- estimating each of a current direct injection (DI) fuel fraction, a DI upper limit, and a DI lower limit as operator torque demand changes, wherein the DI upper limit and the DI lower limit are based on engine speed and engine load;
- during a first condition, non-intrusively commanding the current DI fuel fraction and learning a DI transfer function based on an air-fuel ratio error relative to the current DI fuel fraction;
- during a second condition, intrusively commanding one of the DI upper limit and the DI lower limit, and learning the DI transfer function based on the air-fuel ratio error relative to the commanded DI upper or DI lower limit;
- and
- delivering fuel to a cylinder of the engine via a direct injector and a port injector based on the learned DI transfer function.
2 more elements
Dependencies are inferred from the claim text.