Failure diagnosis apparatus for homogeneous charge...

Details Failure diagnosis apparatus for homogeneous charge... Failure diagnosis apparatus for homogeneous charge...

2008-10-10

2011-10-11

Dunn, Drew A (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

C702S185000, C702S189000, C702S193000, C123S308000, C123S432000, C123S568170

Reexamination Certificate

active

08036855

ABSTRACT:
A failure diagnosis apparatus for a homogeneous charge compression ignition engine having combustion modes switchable between HCCI combustion, performed together with internal EGR, and SI combustion. The engine includes an intake variable valve mechanism and an exhaust variable valve mechanism. The apparatus includes an airflow meter detecting an intake amount of mixture drawn into a combustion chamber of the engine and a control computer determining whether a failure has occurred in the intake variable valve mechanism and the exhaust variable valve mechanism from intake amount change information. The control computer determines whether a failure has occurred based on information on switching from SI combustion to HCCI combustion, intake amount change information, and predetermined first reference change information, and determines whether a failure has occurred based on information on switching from HCCI combustion to SI combustion, intake amount change information, and predetermined second reference change information.

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