System for diagnosing EGR valve, actuator and sensor related failure conditions
First Claim
1. A system for diagnosing EGR valve-related failure conditions, comprising:
- an EGR valve having a valve inlet in fluid communications with an exhaust manifold of an internal combustion engine and a valve outlet in fluid communications with an intake manifold of said engine, said EGR valve responsive to a valve command to control exhaust gas flow therethrough;
an EGR valve position sensor producing an EGR valve position signal indicative of EGR valve position; and
an engine controller producing said valve command, said engine controller responsive to said valve position signal to determine a final valve position after a time delay following said valve command commanding said EGR valve from one of a fully closed and a fully open position to one of a fully open and a fully closed position, said engine controller logging an EGR valve response time fault if a difference between said final valve position and an expected valve position is greater than a position threshold.
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Accused Products
Abstract
An EGR fault/failure determination system for an internal combustion engine is operable to monitor a number of EGR system operational parameters and diagnose various EGR-related fault and failure statuses therefrom. For example, the system is operable to determine a number of EGR system-related fault and failure conditions by monitoring measured and command EGR position signals to determine EGR valve controller functionality, to monitor response times between fully open and closed EGR valve positions by comparing measured response times to a calibratable response time value, and to monitor in-range EGR position failures associated with fully closed and fully opened EGR valve position values. The system further includes a Kalman filter-based fault/failure isolation feature operable to isolate and identify one or more sources of EGR valve-related faults/failures.
54 Citations
11 Claims
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1. A system for diagnosing EGR valve-related failure conditions, comprising:
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an EGR valve having a valve inlet in fluid communications with an exhaust manifold of an internal combustion engine and a valve outlet in fluid communications with an intake manifold of said engine, said EGR valve responsive to a valve command to control exhaust gas flow therethrough;
an EGR valve position sensor producing an EGR valve position signal indicative of EGR valve position; and
an engine controller producing said valve command, said engine controller responsive to said valve position signal to determine a final valve position after a time delay following said valve command commanding said EGR valve from one of a fully closed and a fully open position to one of a fully open and a fully closed position, said engine controller logging an EGR valve response time fault if a difference between said final valve position and an expected valve position is greater than a position threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of diagnosing EGR valve-related failure conditions comprising the steps of:
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monitoring a valve position of an EGR valve disposed between an exhaust manifold and an intake manifold of an internal combustion engine;
monitoring an EGR valve command;
determining a final valve position after a time delay following said valve command corresponding to commanding said EGR valve from one of a fully open and a fully closed position to one of a fully closed to a fully open position;
logging an EGR valve response time fault if a difference between said final valve position and an expected valve position is greater than a position threshold. - View Dependent Claims (8, 9, 10, 11)
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Specification