A system for calibration of an airflow sensor in an engine and a method of recalibrating values generated by an airflow sensor at an engine air intake

摘要

In an internal combustion engine having an exhaust gas recirculation system, a mass airflow (MAF) sensor is disposed at the air inlet to an engine cylinder. For engines with an EGR recirculation path, the sensor is upstream of that path. The MAF sensor provides signals to an engine control module (ECM) indicative of the mass airflow of the intake charge to the engine. A system and method for on-line self-recalibration of the MAF sensor and the MAF values includes comparing the sensed MAF value with an ideal MAF value obtained using data from sensors downstream from the MAF sensor. If a comparison of the sensed versus the actual MAF values reveals that the MAF sensor is out of calibration, a regression analysis is applied to several data pairs of MAF sensor output magnitude and ideal MAF value to modify the relationship between MAF sensor output and sensed MAF value.