Security for engine torque input air-per-cylinder calculations
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United States of America Patent
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Nov 1, 2011
Grant Date -
Nov 26, 2009
app pub date -
Oct 21, 2008
filing date -
May 21, 2008
priority date (Note) -
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Abstract
An air-per-cylinder (APC) security system for a vehicle comprises an APC determination module, an APC threshold determination module, and an APC diagnostic module. The APC determination module determines first and second APC values for first and second cylinders of an engine, respectively, based on mass airflow (MAF) into the engine. The APC threshold determination module determines an APC threshold based on the first APC value and a spark timing for the first cylinder. The APC diagnostic module selectively diagnoses a fault in the APC determination module when the second APC value is greater than a sum of the first APC value and the APC threshold.
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