Methods for variable displacement engine diagnostics

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

2008-08-21

2009-06-16

Solis, Erick (Department: 3747)

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

C123S19800E, C123S090150, C123S691000, C123S692000

Reexamination Certificate

active

07546827

ABSTRACT:
Methods and systems are provided for monitoring cylinder valve deactivation in an engine operating with a plurality of cylinder valves. One example method comprises, sensing a plurality of cylinder valve positions of a plurality of cylinder valves; and combining the plurality of sensed positions to form a combined cylinder valve signal. The method may further include identifying valve degradation and differentiating valve degradation among the plurality of cylinder valves based on the combined cylinder valve signal and an expected value of the signal, and further based on a crank angle at which the expected value differs from the combined signal.

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