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Security for engine torque input air-per-cylinder calculations

  • US 8,050,841 B2
  • Filed: 10/21/2008
  • Issued: 11/01/2011
  • Est. Priority Date: 05/21/2008
  • Status: Active Grant
First Claim
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1. An air-per-cylinder (APC) security system for a vehicle, comprising:

  • an APC determination module that determines first and second APC values for first and second cylinders of an engine, respectively, based on mass airflow (MAF) into said engine;

    an APC threshold determination module that determines an APC threshold based on said first APC value and a spark timing for said first cylinder; and

    an APC diagnostic module that selectively diagnoses a fault in said APC determination module when said second APC value is greater than a sum of said first APC value and said APC threshold.

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