Mass airflow sensor calibration evaluation
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United States of America Patent
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Nov 3, 2015
Grant Date -
Nov 13, 2014
app pub date -
Jan 18, 2012
filing date -
Jan 18, 2012
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Abstract
An engine has a controller for causing an EGR system to disallow EGR while concurrently executing a strategy for evaluating calibration of a mass airflow sensor in an intake system by operating the engine at each of different combinations of engine speed and engine load, and for each combination of engine speed and engine load, recording a corresponding output signal of the sensor and also calculating mass flow passing through an intake manifold as a function of intake manifold pressure, intake manifold temperature, speed of the engine, and volumetric efficiency of the engine. The output signal of the MAF sensor and the calculated mass flow passing through the intake manifold at least one combination of engine speed and engine load are used to evaluate the calibration the MAF sensor.
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