Methods for variable displacement engine diagnostics

Details Methods for variable displacement engine diagnostics Methods for variable displacement engine diagnostics

2011-03-08

2011-03-08

Caputo, Lisa M (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Testing of an individual engine part

Reexamination Certificate

active

07900509

ABSTRACT:
Various methods are described for monitoring cylinder valve deactivation in an engine, the engine including at least a cylinder valve actuator for deactivating at least a cylinder of the engine. One example method comprises indicating degradation of the valve actuator based on crankshaft acceleration.

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