Intake air over-restriction monitoring
AssigneeGM Global Technology Operations LLC
InventorsKurt D. Mc Lain, Wenbo Wang, Michael A. Kropinski
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Abstract
A method of monitoring air flow restriction in an air intake of an internal combustion engine includes monitoring a plurality of manifold absolute pressure (MAP) samples and determining respective MAP thresholds corresponding to each of the MAP samples. Each of the MAP samples is compared to its respective MAP threshold. A percentage of failed MAP samples is determined based on the comparing and an over-restricted air intake condition is selectively indicated based on the percentage of failed MAP samples.
Claims21
A method of monitoring air flow restriction in an air intake of an internal combustion engine, comprising:
- monitoring a plurality of manifold absolute pressure (MAP) samples;
- determining respective MAP thresholds corresponding to each of said MAP samples;
- comparing each of said MAP samples to its respective MAP threshold;
- determining a percentage of failed MAP samples based on said comparing;
- and
- selectively indicating an over-restricted air intake condition based on said percentage of failed MAP samples.
A system for monitoring air flow restriction in an air intake of an internal combustion engine, comprising:
- a first module that determines respective MAP thresholds corresponding to each of a plurality of monitored MAP samples;
- a second module that compares each of said MAP samples to its respective MAP threshold;
- a third module that determines a percentage of failed MAP samples based on said comparing;
- and
- a fourth module that selectively indicates an over-restricted air intake condition based on said percentage of failed MAP samples.
A method of monitoring air flow restriction in an air intake of an internal combustion engine, comprising:
- determining a throttle position;
- monitoring a plurality of manifold absolute pressure (MAP) samples;
- determining respective MAP thresholds corresponding to each of said MAP samples when said throttle position exceeds a threshold throttle position;
- monitoring an intake air temperature (IAT) and a mass air flow (MAF) associated with each of said MAP samples;
- determining a respective modification factor for a particular MAP threshold based on said IAT and said MAF, wherein said MAP threshold is modified by multiplying said MAP threshold by its corresponding modification factor;
- comparing each of said MAP samples to its respective MAP threshold;
- determining a percentage of failed MAP samples based on said comparing;
- and
- selectively indicating an over-restricted air intake condition based on said percentage of failed MAP samples.
Dependencies are inferred from the claim text.