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US 11,378,028 B2Granted
System and method for diagnosing cylinder deactivation
AssigneeFord Global Technologies, LLC
InventorsAdam Krach, Michael Casedy, Rommel Racelis, Patrick Smithberger
Life of this patent
Estimating the term…
Abstract
Systems and methods for determining degradation of a cylinder deactivation mechanism are described. In one example, engine data generated while an engine is operation with all of its cylinders active is used to correct engine data generated while one or more engine cylinders are deactivated to improve detection of a degraded cylinder deactivation mechanism.
Claims19
An engine control method, comprising:
- estimating an air charge of an engine according to data generated when one or more of an engine's cylinders are commanded deactivated via a controller, where the air charge is adjusted according to an adaptive term determined from data generated when all of the engine's cylinders are activated, where the data includes an amount of fuel injected to the engine;
- and
- adjusting engine operation according to the estimate.
An engine system, comprising:
- an engine including one or more valve deactivating mechanisms;
- a controller including executable instructions stored in non-transitory memory that cause the controller to adjust operation of the engine when the one or more valve deactivating mechanisms is determined to be degraded according to a correction factor that is based on data generated while all cylinders of the engine were activated and an engine air charge estimate that is based on the correction factor.
An engine control method, comprising:
- adjusting engine operation according to a metric comprising a ratio of engine air charge values, where the ratio of engine air charge values includes a numerator that is based on a difference of two engine air charge values and a denominator that is one of the two engine air charge values.
Dependencies are inferred from the claim text.