Internal-combustion engines – Charge forming device – Including cylinder pressure or temperature responsive means
Reexamination Certificate
2008-03-14
2009-12-29
Cronin, Stephen K (Department: 3747)
Internal-combustion engines
Charge forming device
Including cylinder pressure or temperature responsive means
C123S305000, C073S114020
Reexamination Certificate
active
07637251
ABSTRACT:
A method to dynamically determine a parametric value for combustion chamber deposits (CCD), e.g. in a controlled auto-ignition engine, including in-situ evaluation of thickness of CCD, based on a sensor which monitors combustion in a homogeneous charge compression ignition engine. It includes a temperature sensor operative to monitor the combustion chamber, and a CCD parameter that is based upon a peak combustion temperature measured at a crank angle. A CCD parameter can also be determined utilizing an in-cylinder pressure monitor, wherein a combustion chamber deposit parameter is based upon crank angle location of a peak in-cylinder pressure parameter.
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Assanis Dionissios N.
Eng James A.
Filipi Zoran S.
Guralp Orgun A.
Hoffman Mark A.
Cronin Stephen K
GM Global Technology Operations Inc.
Hoang Johnny H
University of Michigan
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