Humidity corrections for fuel setpoint adaptation

摘要

A method for adjusting an oxygen sensor measurement within an exhaust gas feedstream output from an internal combustion engine based on humidity includes monitoring relative humidity of ambient air obtained from a humidity sensor. Specific humidity at the oxygen sensor is modeled based on the relative humidity. The oxygen sensor measurement is adjusted based on the modeled specific humidity at the oxygen sensor.

主权项

1. An apparatus for adjusting an oxygen sensor measurement within an exhaust gas feedstream output from an internal combustion engine, comprising:
the oxygen sensor disposed within the exhaust gas feedstream output from the internal combustion engine and configured to provide a measurement that includes a difference between the oxygen content in the exhaust gas feedstream and an ideal oxygen content of ambient air; a mass airflow sensor disposed upstream of the internal combustion engine and configured to obtain temperature and pressure of an intake mass airflow entering the internal combustion engine, a humidity sensor located proximate to the mass airflow sensor and configured to obtain relative humidity of ambient air; an exhaust gas sensor disposed within the exhaust gas feedstream output from the internal combustion engine and configured to obtain temperature and pressure of the exhaust gas feedstream; and a control module
monitoring the relative humidity of the ambient air obtained from the humidity sensor,modeling specific humidity at the oxygen sensor based on the relative humidity, andadjusting the oxygen sensor measurement based on the specific humidity at the oxygen sensor.