METHOD AND APPARATUS TO MONITOR A MASS AIRFLOW METERING DEVICE IN AN INTERNAL COMBUSTION ENGINE
First Claim
1. Method for operating an internal combustion engine configured to operate in a controlled auto-ignition combustion mode and equipped with a mass airflow metering device, the method comprising:
- monitoring an engine combustion state;
monitoring states of engine operating parameters;
calculating a nominal intake air mass flowrate corresponding to the states of the engine operating parameters;
estimating an intake air mass flowrate corresponding to the nominal intake air mass flowrate and the engine combustion state;
measuring intake air mass flowrate with the mass airflow metering device;
comparing the estimated and measured intake air mass flowrates; and
detecting a fault related to the mass airflow metering device when a difference between the estimated and measured intake air mass flowrates exceeds a predetermined threshold.
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Abstract
A method for operating an internal combustion engine configured to operate in a controlled auto-ignition combustion mode and equipped with a mass airflow metering device includes monitoring an engine combustion state, monitoring states of engine operating parameters, calculating a nominal intake air mass flowrate corresponding to the states of the engine operating parameters, estimating an intake air mass flowrate corresponding to the nominal intake air mass flowrate and the engine combustion state, measuring intake air mass flowrate with the mass airflow metering device, comparing the estimated and measured intake air mass flowrates, and detecting a fault related to the mass airflow metering device when a difference between the estimated and measured intake air mass flowrates exceeds a predetermined threshold.
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Citations
11 Claims
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1. Method for operating an internal combustion engine configured to operate in a controlled auto-ignition combustion mode and equipped with a mass airflow metering device, the method comprising:
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monitoring an engine combustion state; monitoring states of engine operating parameters; calculating a nominal intake air mass flowrate corresponding to the states of the engine operating parameters; estimating an intake air mass flowrate corresponding to the nominal intake air mass flowrate and the engine combustion state; measuring intake air mass flowrate with the mass airflow metering device; comparing the estimated and measured intake air mass flowrates; and detecting a fault related to the mass airflow metering device when a difference between the estimated and measured intake air mass flowrates exceeds a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Method for monitoring operation of a mass airflow metering device configured to monitor an intake air mass flowrate to a multi-cylinder internal combustion engine operating in a controlled auto-ignition combustion mode, comprising:
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monitoring combustion states for each cylinder; monitoring states of engine operating parameters; calculating a nominal intake air mass flowrate corresponding to the states of the engine operating parameters; estimating an intake air mass flowrate corresponding to the nominal intake air mass flowrate and the combustion states for each cylinder; measuring an intake air mass flowrate with the mass airflow metering device; comparing the estimated and measured intake air mass flowrates; and detecting a fault related to the mass airflow metering device when the measured intake mass airflow rate differs from the estimated intake mass airflow rate by an amount greater than a threshold amount. - View Dependent Claims (9)
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10. Method for executing an in-range rationality check of a mass airflow metering device for an internal combustion engine, comprising:
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operating the engine in a controlled auto-ignition combustion mode; monitoring engine combustion states; monitoring engine operating parameters; calculating a nominal intake air mass flowrate corresponding to the monitored engine operating parameters; estimating an intake air mass flowrate corresponding to the nominal intake air mass flowrate and the engine combustion states; measuring intake air mass flowrate with the mass airflow metering device; and compare the estimated and measured intake air mass flowrates. - View Dependent Claims (11)
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Specification