Security for engine torque input air-per-cylinder calculations
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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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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Citations
22 Claims
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1. An air-per-cylinder (APC) security system for a vehicle, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for an air-per-cylinder (APC) system of a vehicle, the method comprising:
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determining first and second APC values for first and second cylinders of an engine, respectively, based on mass airflow (MAF) into said engine; determining an APC threshold based on said first APC value and a spark timing for said first cylinder; and selectively diagnosing a fault in said first APC value when said second APC value is greater than a sum of said first APC value and said APC threshold. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification