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US 7,219,004 B2Granted
Adaptive control for engine with electronically adjustable valve operation
AssigneeFord Global Technologies, LLC
InventorsIlya V. Kolmanovsky, John Ottavio Michelini
Life of this patent
Estimating the term…
Abstract
A method is described for estimating cylinder airflow in engines that operate with manifold pressure near atmospheric pressure to compensate for degraded sensor response at such conditions. The method uses an adaptive approach that is updated under preselected engine operating conditions to thereby allow improved accuracy across a variety of engine operation.
Claims12
A system comprising:
- an engine with electronically adjustable engine valve timing or valve lift;
- an exhaust gas oxygen sensor coupled in an exhaust system of the engine;
- and
- a controller for:
- determining whether a steady state condition is present;
- when said condition is present, operating in a first mode where an engine air amount is determined based on a valve amount and an adaptive parameter, said adaptive parameter being updated to compensate for part variability and wear, wherein during said first mode said controller updates said adaptive parameter based on said sensor;
- operating in a second mode where said engine air amount is determine based on said valve amount and said adaptive parameter;
- and
- adjusting an injected fuel amount based on said engine air amount, wherein said adaptive parameter is not updated during said second mode.
6 more elements
A system comprising:
- an engine with electronically adjustable engine valve timing or valve lift;
- a sensor coupled to said engine;
- and
- a controller for:
- determining whether a condition is present;
- when said condition is present, operating in a first mode where an engine air amount is determined based on a valve amount and an adaptive parameter, said adaptive parameter being updated to compensate for part variability and wear, wherein during said first mode said controller updates said adaptive parameter based on said sensor;
- and
- operating in a second mode where said engine air amount is determine based on said valve amount and said adaptive parameter, wherein said adaptive parameter is not updated during said second mode.
5 more elements
Dependencies are inferred from the claim text.