Algorithm to diagnose leaks or blockages downstream of the secondary air injection reaction (SAIR) pressure sensor
AssigneeGM Global Technology Operations LLC
InventorsIan J. Mac Ewen, Martin L. Hall, Lawrence O Murray, Julia C. Grow, Richard A. Van Camp, David Edward Prout, Igor Anilovich
Life of this patent
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Abstract
A control module and method for an exhaust system of an engine can include a secondary air intake (SAI) pressure module that monitors SAI pressure. An accumulation module can accumulate an SAI string length based on the monitored SAI pressure. A calculation module can determine an average SAI string length based on the accumulated SAI string length. A determination module can determine an operating characteristic of the vehicle exhaust based on the average SAI string length.
Claims13
A control module for an exhaust system of an engine, the module comprising:
- a secondary air intake (SAI) pressure module that is programmed to monitor SAI pressure;
- an accumulation module that is programmed to calculate an SAI string length based on the monitored SAI pressure, the SAI string length comprising an accumulated length of a trace of SAI pressure including an amplitude and frequency over time;
- a calculation module that is programmed to determine an average SAI string length based on the accumulated SAI string length;
- and
- a determination module that determines an operating characteristic of the vehicle exhaust based on the average SAI string length.
A method for determining an operating characteristic of an exhaust system of an engine, the method comprising:
- monitoring a secondary air intake (SAI) pressure;
- calculating an SAI string length based on the monitored SAI pressure, the SAI string length comprising an accumulated length of a trace of SAI pressure including an amplitude and frequency over time;
- calculating an average SAI string length based on the accumulated SAI string length;
- and
- determining the operating characteristic of the vehicle exhaust based on the average SAI string length.
A control module for an exhaust system of an engine, the module comprising:
- a secondary air intake (SAI) pressure module that is programmed to monitor SAI pressure;
- an accumulation module that is programmed to calculate an SAI string length based on the monitored SAI pressure, the SAI string length comprising an accumulated length of a trace including an amplitude and frequency of SAI pressure over time;
- and
- a determination module that is programmed to determine an operating characteristic of the vehicle exhaust based on the SAI string length.
Dependencies are inferred from the claim text.