Exhaust gas recirculation system fault detector
First Claim
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1. A method of determining a fault in an EGR system includes the steps of:
- comparing the measured exhaust gas flow through the EGR system to an expected EGR flow;
determining the period of time that the expected flow of EGR deviates from the measured EGR flow by a calibrated EGR flow amount; and
indicating a fault condition in the EGR system if the duration of the deviation exceeds a predetermined amount of time.
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Abstract
The method for determining a fault in an exhaust gas recirculation system includes comparing the measured exhaust gas flow of the EGR system to an expected exhaust gas recirculation flow. If the two are not the same the time period that the expected exhaust gas recirculation flow deviates from the measured exhaust gas recirculation flow by a calibrated EGR flow amount is determined. A fault condition in the EGR system is indicated if the duration of the deviation exceeds a predetermined amount of time.
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Citations
10 Claims
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1. A method of determining a fault in an EGR system includes the steps of:
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comparing the measured exhaust gas flow through the EGR system to an expected EGR flow; determining the period of time that the expected flow of EGR deviates from the measured EGR flow by a calibrated EGR flow amount; and indicating a fault condition in the EGR system if the duration of the deviation exceeds a predetermined amount of time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of determining and following operation of an EGR system including the steps of:
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determining EGR flow is between an upper and a lower limit of EGR flow magnitude; checking for the disconnection of a downstream hose; checking for disconnection of an upstream hose; checking for a restricted or plugged EGR valve; checking for an EGR valve stuck in an open position; checking for a restricted EGR metering orifice via a delta pressure; and checking for a restricted EGR metering orifice via oscillations in an EGR duty cycle. - View Dependent Claims (9, 10)
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Specification